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Quick Reference Service Guide
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May 1999 Edition
HP Color LaserJet Family Quick Reference Service Guide
HP Color LaserJet Family Quick Reference Service Guide
May 1999 Edition
© Copyright Hewlett-Packard Company 1999 All Rights Reserved. Reproduction, adaptation, or translation without prior written permission is prohibited, except as allowed under the copyright laws. Publication number 5090-3391 First edition, May 1999 Warranty The information contained in this document is subject to change without notice. Hewlett-Packard makes no warranty of any kind with respect to this information. HEWLETT-PACKARD SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Hewlett-Packard shall not be liable for any direct, indirect, incidental, consequential, or other damage alleged in connection with the furnishing or use of this information.
Trademark credits AdobeTM and PostScriptTM are registered trademarks of Adobe Systems, Inc., which may be registered in certain jurisdictions. Microsoft® is a U.S. registered trademark of Microsoft Corporation. MS-DOS® is a U.S. registered trademark of Microsoft Corporation. UNIX® is a registered trademark in the United States and other countries, licensed exclusively through X/Open Company Limited.
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Contents
1 2 3 4 5 6 7 8 9 Troubleshooting control panel messages . . . . . . . . . . . . . 1 Service tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 Input/Output (I/O) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 Media specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 Toner cartridge information . . . . . . . . . . . . . . . . . . . . . . 85 Printer options and consumables . . . . . . . . . . . . . . . . . . 97 Printer parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103 Image quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
10 Wiring diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167 11 Services and support resources . . . . . . . . . . . . . . . . . 171 A Acronyms and abbreviations . . . . . . . . . . . . . . . . . . . . 183 Index. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185
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Ordering other manuals
This HP Color LaserJet Family Quick Reference Service Guide has been created to help the HP LaserJet service engineer quickly troubleshoot common printer problems. While this reference is intended to provide information the service engineer will need for on-site repair of HP LaserJet color products, it is not intended to replace the service manual for any HP LaserJet color product. For detailed information about the HP LaserJet color products described in this guide, see the user guide or service manual for that product. Service manuals for HP LaserJet products are available from Hewlett-Packard. The phone number for the Service Parts Order Desk is: (800) 227-8164 (U.S. only) If you are located outside of the U.S., contact your local HP Sales and Service Office. See "Services and support resources" on page 171.
Supported products
Name used in this guide HP Color LaserJet 4500/4500 N/ 4500 DN Model number C4084A/ C4089A/ C4094A Maximum pages per month 35 K Service manual part number C4084-91017
Note
This guide will be updated as the service needs change, as new products are introduced, or as information becomes available.
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Troubleshooting control panel messages
Overview
This chapter provides a list of control panel messages for the HP Color LaserJet printers. Alphabetical messages are listed first, followed by numerical messages. Control panel messages that are self-explanatory are not included. See the service manual for more detailed information. Following the control panel messages are suggestions for troubleshooting paper path problems.
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Overview 1
Pre-troubleshooting checklist
WARNING!
Always unplug the printer before servicing. Current is present in the DC power supply whenever the printer is plugged in.
Note
The customer is responsible for ensuring that the maintenance units are in good condition. Before troubleshooting any specific printer problem, check the following: · · · Has the printer been maintained on a regular basis? Are all of the maintenance units within their rated life? Is the customer using media as specified in Chapter 5, "Media specifications" and the HP LaserJet Family Paper Specification Guide? Is the media stored correctly and within environmental limits? Is the printer installed on a solid, level surface? Has the line voltage been checked to make sure that it does not vary more than 20% from the nominal rated value specified on the powerrating label? Large motors used near the printer can cause temporary voltage changes. · · · · Is the operating environment within the parameters listed in the printer service manual? Is the printer protected from substances such as office cleaning materials and the ammonia gas that is produced by diazo copiers? Is the printer protected from direct sunlight? Have all non-HP components (toner, typeface DIMMs, memory boards, and MIO cards) been removed from the printer?
· · ·
CAUTION
Using non-HP components, such as toner cartridges, may cause permanent damage to the printer.
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·
Has the printer hardware or software configuration changed? Or could the problem be associated with any specific software? Contact the Customer Care Center for software-related problems (see Chapter 11, "Services and support resources").
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·
Could the problem be related to network configuration changes? Remove the printer from the network and make sure that the failure is associated with the printer before beginning troubleshooting.
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Pre-troubleshooting checklist
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Control panel messages
Alphabetical messages
Access denied, menus locked
This message is displayed for approximately 5 seconds when a user has attempted to select a menu value while the printer control panel locking is enabled. · See the system administrator for access to the printer control panel.
Bad duplexer connection
The duplex unit is not correctly installed. 1 Check that the duplex unit's short power cord is plugged into the printer and that the power cord is plugged into the duplex unit. 2 Turn the printer off, and then turn the printer on. 3 If the error continues, verify that the duplex unit is correctly installed. 4 If the error persists, replace the duplexer.
Calibration executing
The printer is executing an internal color calibration. This process should take approximately 90 seconds. · No action is required.
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Canceling job
The printer is canceling the current print job. Incoming data for the current job will be discarded. · No action is required.
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Cannot duplex check rear bin alternates with Cannot duplex check paper
The printer cannot duplex because the rear output bin is open or the media is not supported by the duplex unit. 1 Close the rear output bin. 2 If the error message does not clear, turn the printer off then on. 3 Verify that the media is supported by the duplex unit.I
Checking printer
The printer is performing an internal test. This process should take approximately 30 seconds. The message is displayed during the initiation of the engine test. When finished, the printer goes online. · No action is required.
Clearing paper from printer
The printer has jammed or was turned on and media was detected in the paper path. The printer is attempting to clear these pages. · No action is required.
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Control panel messages 5
Close middle front drawer
The drawer that holds the intermediate transfer belt (ITB) is open. Switch SW1 indicates the drawer is open. When the drawer is closed, a plastic protrusion on the lower left corner of the drawer pivots an arm allowing SW1 to toggle to the open position. 1 Close the ITB drawer. 2 If the message persists, remove the printer's left-side cover and inspect the mechanical linkage that closes SW1. 3 Refer to the wiring diagram to verify the wiring; the two-wire connector should be firmly seated to SW1 and the wiring harness should be firmly seated to connector J1003 of the DC controller PCB. 4 If the message persists, use an ohmmeter to verify the functionality of SW1.
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Close upper rear door
Switch SW5 monitors the closing of the printer's upper rear door (this door allows you to access the fusing assembly). When the fusing door is closed, a tab on the rear door pushes a door switch actuator that runs along the left side of the printer and closes SW5.
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WARNING!
High voltages occur during operation. Closing the rear door, drum drawer, and ITB drawer closes SW4 and SW5, enabling +24B Vdc. When either drawer or the rear door is open +24B Vdc is disabled. This safety feature protects the operator from high voltages. 1 Close the upper rear door. 2 If the message persists, remove the printer's left-side cover and inspect the mechanical linkage of SW5 and the lever. 3 Refer to the wiring diagram and verify that all connections (J103 of the DC controller PCB and SW5) are firmly seated. 4 Verify that both the drum drawer and ITB drawer are firmly closed; closing these drawers also closes SW4.
Close top cover
SW2 indicates if the printer's toner cartridge access door is closed. When the toner cartridge door is closed a lever is pushed down. This in turn rotates a pivot forward, opening the top cover switch (SW2). 1 Close the top cover. 2 If the message persists, remove the printer's top cover and verify all mechanical linkages associated with SW2. 3 Verify that the connector on J1003 of the DC controller PCB is firmly seated.
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Control panel messages 7
Close upper front drawer
The drawer that holds the imaging drum is open. Switch SW3 indicates that the drawer is open. When the drawer is closed a plastic protrusion on the lower left corner of the drawer pivots an arm that allows SW3 to toggle to the open position.
WARNING!
Closing the drawer also closes SW4 (the front drawer switch). When SW4 is open +24B Vdc is disabled. This safety feature protects the operator from any high voltages when the drum drawer or ITB drawer is open. 1 Open the drawer and firmly push the drawer closed using one hand in the middle of the drawer. 2 If the message persists, remove the printer's left-side cover and inspect the mechanical linkage that closes SW3. 3 Refer to the wiring diagram (chapter 10) and verify the wiring; the two-wire connector should be firmly seated to SW3 and the wiring harness should be firmly seated to connector J1003 of the DC controller PCB. 4 If message persists, use an ohmmeter to verify the functionality of SW3.
Cold reset
The cold reset power-up sequence has been entered. · Most printer variables will reset to their factory default values.
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Continuous page, press cancel job
The printer configuration page is being printed continuously. · Press CANCEL JOB to terminate continuous configuration page printing and return the printer to the READY state.
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Density sensor out of range alternates with Clean density sensor
A density sensor out of range error was detected during a color calibration. · The density sensor may be dirty. Inspect and clean the sensor. See "Cleaning the toner density sensor" in the service manual.
Data received
The printer has received and processed data and is waiting for a form feed. · Press CANCEL JOB and resend the last page of the job, making sure a form feed is sent with it.
Diagnostics mode
The extended diagnostics power-up key sequence has been entered. Refer to the diagnostics procedures provided in the service manual. · No action is required.
Drum error replace drum kit
An error has been detected with a component of the print drum kit. · Replace the print drum kit.
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Control panel messages 9
Drum life low replace drum kit
Approximately 80% of the drum's life has been consumed. · Drum replacement will be required in the near future.
Drum life out replace drum kit
The imaging drum has reached the end of its expected life. · Replace the print drum kit.
Duplexer error check duplexer
An error has occurred in the duplex unit. 1 Verify that the duplex unit is correctly installed. 2 Verify that the small power cord from the duplex unit is plugged into the printer and the power cord from the AC outlet is plugged into the duplex unit.
EIO x initializing yyy alternates with Do not power off
The EIO device in slot "x" is initializing. The yyy value will increment every 10 seconds during this process. · No action is required.
EIO x not functional
The EIO slot specified does not have a card installed or is not functional. · No action is required.
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Event log empty
SHOW EVENT LOG was selected from the Information menu, but the
event log has no entries. · No action is required.
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Fuser life low replace kit
Approximately 95% of the fuser's life has been consumed. · Fuser replacement will be required in the near future. Continue printing, or replace the fuser kit.
Fuser life out replace kit
The fuser has reached the end of its expected life. · Replace the fuser.
Install drum kit
The drum kit is not installed or is incorrectly installed. · Verify that the drum kit is correctly installed.
Install Tray 2
The printer cannot print until media is loaded into Tray 2. The paper path for Tray 3 passes through Tray 2. · Insert Tray 2 into the printer so that printing from either Tray 2 or Tray 3 can begin or continue.
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Control panel messages 11
Memory full stored data lost
The printer has no available memory. The current job may not print correctly. Some downloaded fonts may have been deleted. · Try printing simplified pages. If this does not resolve the problem, add printer memory.
Memory settings changed
The I/O buffering settings were changed by the printer because there is not enough memory available to use the previous settings. · No action is required. However, adding printer memory can prevent this from occurring.
Memory shortage job cleared
The available memory was not enough to continue printing. The remainder of the job was canceled. · Adding printer memory can prevent this from occurring.
Memory shortage page simplified
The printer's adaptive data compression had to resort to lossy compression to fit raster graphics in the available memory. This has caused a data loss in the raster output. · Reduce the complexity of the page to improve the print quality.
Note
Adding memory will not correct this problem.
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No job to cancel
CANCEL JOB was pressed but there is no active job or buffered data to cancel. The printer automatically returns to the READY state. · No action is required.
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Page cannot print now alternates with Retry when printing stops
An internal page has been requested while the printer is printing an incoming job. Interrupting the job to print the internal page would corrupt the job's environment and potentially cause the job to finish printing incorrectly after the internal page is completed. Consequently, internal pages are not permitted to interrupt jobs and can only be printed when the printer is idle. · Retry print job after printer has completed current job.
Page simplified
The printer's adaptive data compression had to resort to lossy compression to fit raster graphics in the available memory. This has caused a data loss in the raster output. · Reduce the complexity of the page to improve the print quality.
Note
Adding memory will not correct this problem.
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Control panel messages 13
Page too complex to print alternates with Press Go to continue
The page could not be printed.
Note
Reducing the complexity of the page could allow it to print successfully. Adding memory will not correct this problem. 1 Press GO to continue printing (you may notice poor print quality on this page). 2 Press CANCEL JOB to terminate the entire job. 3 Reduce the complexity of the page; this may allow it to print successfully.
Press Go to print alternates with Press Select to change toner
The top cover was opened and closed when the printer was not in the toner cartridge replacement mode. · Press GO to resume printing or press SELECT to enter the toner replacement menu.
Printer language not available
The printer received a request for a new language (personality) that does not exist in the printer. · No action is required.
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Reinstall transfer belt
This message occurs if you do not have the intermediate transfer belt (ITB) installed in the printer or if the home positions (marks on the ITB) are not detected by sensor PS5.
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Note
The intermediate transfer belt must be rotating before PS5 is able to detect the "home position" marks on the ITB. Both the ITB and the imaging drum are driven by the drum motor (M4). 1 Check SW1 for correct operation and make sure the cables are connected. 2 Verify that the ITB is installed in the printer. 3 If the ITB is installed and seated properly, verify that PS5 is not damaged. PS5 is located on the ITB assembly. If the sensor appears damaged, replace the entire ITB assembly. 4 Clean PS5. 5 Verify all wiring within the ITB drawer. Note the connection on the ITB assembly (located on the front, lower, left-hand corner of the assembly). When the drawer is closed the connector "mates" with a receptacle connector on the drawer. Verify that the connector and all wiring are in good condition. 6 Place the printer in diagnostic mode and run the drum test to verify drive spindle movement for both the drum and the ITB. 7 If the imaging drum is not rotating, verify that the imaging drum connector is firmly seated into the J204 connector of the developing PCB.
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Control panel messages 15
Remove paper top output bin
The top output bin holds 200 sheets of paper. Sensor PS9 along with its sensor flag detects the height of the output paper stack. Perform the following items if this message appears with no paper in the output bin. 1 Verify that PS9 moves freely and its movement is not blocked. 2 Verify that PS9 is free of dust and debris (the printer's top cover must be removed to access the sensor). 3 Verify that the PS9 sensor flag and arm move freely. 4 Verify that all connectors are firmly seated. Refer to the wiring diagram in chapter 10.
Note
PS9 (a three-wire sensor) plugs into a through-wall connector on the printer's chassis and then into a 14-pin wire harness, which plugs into J206 on the developing PCB. All signals from the developing PCB are routed to J201 on the developing PCB to J1017 on the DC controller PCB.
Resetting memory
The printer is executing a memory reset. The printer returns to the READY state upon completion of this process. · No action is required.
Resetting values finished
The color calibration density values have been reset to their default values. · No action is required.
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Select language
The language selection power-up key sequence has been entered. The printer will prompt the user to select a new control panel display language once it has completed its initialization process. · Select a new language when prompted.
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Service mode
The service mode power-up key sequence has been entered. The printer will remain in service mode until GO is pressed. · Press GO to exit the service mode.
Toner CMYK low
TONER LOW = CONTINUE (default) is set on the front panel in the
configuration menu. · Printing will continue until a TONER OUT message appears. To change the toner cartridge now, press SELECT. The toner cartridge specified is low on toner. This message appears if
Toner CMYK low alternates with Press Select to change toner
The toner cartridge specified is low on toner and must be replaced. This message appears when TONER LOW = STOP is set on the front panel in the configuration menu. · Press SELECT to enter the toner replacement menu.
Toner CMYK out alternates with Press Select to change toner
The toner cartridge specified is out of toner. · · Press SELECT to enter the toner replacement menu. Press GO after replacing the toner cartridge.
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Control panel messages 17
Toner position [color] = [state]
Indicates the current state of a particular toner cartridge. This message is displayed when SELECT is pressed while a TONER LOW/OUT message is displayed. · If necessary, replace the specified toner cartridge.
Transfer kit low replace kit
The transfer kit is near the end of its expected life. · Although printing can continue, the transfer kit should be replaced for optimum printer operation.
Transfer kit out replace kit
The transfer kit has reached the end of its expected life. · Replace the transfer kit.
Tray x empty [type] [size]
The specified tray is empty but the current job does not require this tray to complete the job. · No action is required. However, to avoid this message in the future, load the proper media type and size into the tray.
Tray x load [type] [size]
The specified media type and size need to be loaded into the requested tray. · Load the specified media type and size into the requested tray. Press GO to override this request and cause the page to be printed on different media.
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Tray x size [size]
Media has been loaded into the tray specified on the control panel. The most recently configured size will be displayed with an asterisk next to it. · · · Use -VALUE+ to view all possible sizes. Press SELECT for the currently displayed size. Press GO to clear the message.
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Tray x type [type]
Media has been loaded into the tray specified on the control panel. The most recently configured type will be displayed with an asterisk next to it. · · · Use -VALUE+ to view all possible sizes. Press SELECT for the currently displayed type. Press GO to clear the message.
Waste toner full replace drum kit
Waste toner full sensor PS13 detects a waste toner full condition. Light receiver and light pipe arrangement along with a window in the drum assembly look for a waste fill condition. Verify that the sensors and light pipes are not blocked. 1 Replace the drum kit. 2 Check the sensor, and if it is defective, replace it.
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Control panel messages 19
Numerical messages
13.xx Paper jam
xx = Description: 0 = Jam in input feed area 1 = Jam in fusing area 2 = Jam in fusing area 3 = Jam in duplex reversing unit 4 = Jam in duplex feed unit 5 = Jam in duplex paper feed area 6 = Jam in duplex paper feed area 7 = Jam in paper feed area 8 = Door open jam 9 = Irregular paper jam in paper path 10 = Paper in the paper path is too short 11 = Paper in the paper path is too long · · · · See "Troubleshooting paper path problems" on page 37. Note the location of the leading edge of the first jammed piece of media. Note the paper jam message. Note the location of the media.
13.xx Paper jam alternates with Check all rear door
Media is jammed in the rear paper path or rear duplexing area. 1 Open the rear duplex cover (if installed) and remove any jammed media. 2 Open the upper rear door and remove any jammed media.
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13.xx Paper jam alternates with Check middle front doors
Media is jammed in the transfer belt area or media is not picking. · · · Open the ITB drawer and remove any jammed media. Watch the pick roller to ensure it is turning. Check for media between the transfer roller and the fusing assembly.
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13.xx Paper jam alternates with Check front duplex drawer
Media is jammed in the front duplexing area. · Open the front duplex drawer and remove any jammed media.
with
13.1 Paper jam open middle front drawer alternates Check in rear of drawer
A jam has occurred inside the ITB drawer area. The jam may be located in the fuser area or between the transfer area and the fuser. 1 Open the ITB drawer and carefully inspect for any media. 2 Be sure to inspect the fusing area. You may need to access the fusing area through the rear door. 3 Remove any jammed media.
20 Insufficient memory alternates with Press Go to continue
More data has been received from the computer than fits in the printer's internal memory. 1 To continue printing, press GO. Only the amount of data that fits in the printer's internal memory is printed. 2 To cancel the job, press CANCEL JOB. 3 Add more memory to resolve the problem.
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Control panel messages 21
22 EIO x buffer overflow alternates with Press Go to continue
The EIO buffer for the EIO card in slot "x" has overflowed during a busy state. · · The current data in the print buffer will be lost. Press GO to resume printing and then resend the job.
22 Parallel IO buffer overflow alternates with Press Go to continue
This message indicates that the parallel buffer has overflowed. · · The current data in the print buffer will be lost. Press GO to resume printing and then resend the job.
40 EIO x data error alternates with Press Go to continue
A connection with the card in the specified slot has been broken. 1 Check that all cables are connected to the EIO ports and that the EIO board is seated properly. 2 If possible, print to another network printer to verify that the network is working properly.
Note
All data in the print buffer will be lost.
41.3 Unexpected paper size alternates with Check paper in Tray x
A tray is configured for a specific paper size, but the sheet loaded is a different size. This error often occurs when the printer is multifeeding. · Load the tray with the requested size media.
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41.5 Unexpected paper type alternates with Check paper in Tray x
A tray is configured for a specific media type, but the printer detects that a different media type is loaded. The most common cause for this error is a paper jam at the registration plate (under the ITB) where the customer does not remove the paper. The engine tries to check the OHT sensor and receives an error. 1 Verify that the correct media is loaded in the input tray and that the printer control panel is configured correctly. 2 Clean the detection windows of OHT sensors 1 and 2.
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49 Error xxxx cycle power
A firmware error has occurred, causing the processor on the formatter to abort operation. This type of error can be caused by invalid print commands, corrupt data, or invalid operations. In some cases, data transmitted to the printer can become corrupt by electrical noise introduced into the cable. Other causes include poor quality parallel cables, poor connections, or home grown applications. On rare occasions the formatter is at fault and is usually indicated by a 79 Service Error. 1 Verify that all cables are connected. 2 Turn the printer off and on to reset the printer. 3 Cancel all print jobs; then, resend to isolate any offending print job. 4 If the formatter pan assembly or DC controller was removed, make sure the ribbon cable between the DC controller and the interconnect PCB is connected.
Note
The front panel will display 49 (FFFF) and the display will be dark if the ribbon cable is not connected. 5 To verify that the formatter is functioning, run the formatter test available in Diagnostic mode. If the formatter passes the test, the formatter is not defective. DO NOT replace the formatter.
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Control panel messages 23
50.x Fuser error
The fusing assembly contains two heating bulbs, two thermo-switches, and two thermistors. AC power is provided to the fusing assembly via the DC power supply, which is controlled by the DC controller PCB. The thermistors monitor the temperature of the fusing assembly and provide feedback to the DC controller PCB to regulate the fusing temperature. The two thermo-switches are wired in series with the fusing bulbs. They "open" if the temperature exceeds 240° C (464° F). x= 1= 2= 3= 4= 5= Description: Low temperature error Fuser warm-up service High fuser temperature Faulty fuser Fuser voltage mismatch (verify that you have NOT installed a 110V fuser in a 220V printer or vice-versa) 6 = Fuser heater cutoff 7 = Fuser motor malfunction (see recommended action for 50.7 Fuser error)
Note
A visual check to determine if the fusing assembly is functional can be made by defeating the rear door interlock switch. To do so, press in on the white plastic button above the left-rear corner of the fan while turning the printer on. If the fusing bulbs and thermoswitches are good, you should observe light from the lower fusing bulb as the printer warms up. 1 Turn the printer off and on to reset the printer. If the error persists, try re-installing the fusing assembly. If the error continues to persist, proceed to step 2. 2 Turn the power off and remove the fusing assembly. Measure the resistance between pin 3 and pin 4. The resistance should be between 6+/-2 ohms. If there is no continuity between pins, it may be assumed that either a heating bulb and/or a thermo-switch is "open." Replace the fusing assembly. If resistance limits were acceptable, proceed to step 3.
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3 Measure the resistance for both the upper and lower thermistors. The resistance should be between 430K ohms and 310K ohms at room temperature (25° C or 77° F). If the resistance exceeds limits, replace the fusing assembly. If resistance is within limits proceed to step 4. 4 Verify, that the connectors at J1011 of the DC controller PCB and J1 of the DC power supply assembly are firmly seated. 5 Replace the power supply assembly.
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Control panel messages 25
50.7 Fuser error
The fusing motor (M1) drives the fusing assembly, the paper transport (web) assembly, ITB lift mechanism, transfer roller, transfer roller lift mechanism, the face down output delivery assembly. A 50.7 fuser error is displayed when no motion is detected within the fuser by PS6. Photosensor PS6 is the fusing unit pressure switch (see the service manual for more information). 1 Power cycle the printer to try to clear the message. 2 Remove the left-side cover of the printer. Verify that the fusing motor (M1) connector is seated firmly into J102 of the feed PCB. 3 Ensure connector at J110 of the feed PCB is firmly seated (this connector contains the wiring for PS6 which provides fuser motion feedback).
Note
Closely inspect the gears along the gear drive path. Make sure there is no binding. Binding of the gears may prevent M1 from rotating. 4 If the error persists, observe the drive shaft of M1. If this shaft DOES NOT rotate, the failure is related to the motor drive circuitry. Referring to the printer's wiring diagram, verify that connectors J102 and J106 of the feed PCB are firmly seated. If there still is an error, replace the fusing motor and then feed PCB in sequence. 5 If the shaft rotates (both forward and reverse), and the 50.7 fuser error is displayed, the cause of the error is related to the motion feedback circuitry. Remove the fusing assembly and verify that the sensor flag is in good condition and functional. Verify that the connector at sensor PS6 is firmly seated; clean the sensor of dust and debris. If the error persists, replace sensor PS6.
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51 Laser error
This message indicates that a laser malfunction has occurred due to a beam detect error or laser failure. 1 Turn the printer off and on to reset the printer. 2 Verify that connectors J1102 on the laser driver PCB and J1008 on the DC controller are seated properly. 3 Verify that connectors J551 on the beam detect PCB and J1006 on the DC controller are seated properly. 4 Replace the laser scanner assembly.
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52 Scanner error
This message indicates that a scanner error has occurred. 1 Turn the printer off and on to reset the printer. 2 Verify that connectors J551 on the beam detect PCB, J1103 on the scanner motor, and J1006 on the DC controller are fully seated and connected correctly. 3 Replace the laser scanner unit.
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Control panel messages 27
53.xy.zz Printer error
This message indicates a memory error. If a DIMM caused the error, the DIMM will not be recognized (configured). x = Memory Type 0 = ROM 1 = RAM y = Device Location 0 = Onboard 1 = DIMM slot 1 2 = DIMM slot 2 3 = DIMM slot 3 zz = Error Number 0 = Unsupported memory 1 = Unrecognized memory 3 = Failed RAM test 1 Verify that the DIMM board is installed correctly and the DIMMs are configured correctly. 2 Turn the printer off and on to reset the printer. 3 Remove and replace the DIMM that caused the error.
54.1 Printer error control panel messages
This message indicates that an internal power failure has occurred. 1 Turn the printer off, and then turn the printer on. 2 Replace the high-voltage power supply
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54.2 Printer error control panel messages
An error 54.2 indicates that a problem exits with the carousel assembly. Either the carousel is not rotating or a sensor has failed. Diver motor (M3) drives the toner cartridge carousel. If motion is not detected, a 54.2 error is displayed. M3 is a 6-phase stepping motor and receives its drive signal from J203 of the developing PCB. Photosensor PS10 monitors "movement" (and the position) of the toner cartridge carousel. Different width tabs (four tabs, one for each cartridge) on the left end of the carousel-housing pass through PS10 to provide positioning information. The black toner cartridge tab is the "home" position. Toner cartridge positioning within the carousel is monitored by PS11. If PS11 fails or is improperly connected a 54.2 error is displayed. Another indicator of this failure mode is that the carousel starts to rotate, and then stops immediately. 1 Turn the printer off and then on to reset the printer.
1
Note
The printer CANNOT operate with the top cover removed unless the carousel brake has been released or removed! 2 Open the color toner door and look for an obstruction. If necessary, remove the toner cartridges individually by manually releasing the carousel brake and rotating the carousel to each cartridge position to remove the cartridges. Turn the printer off and on to reset the printer. 3 Verify that the carousel drive motor wiring harness is firmly seated into connector J203 of the developing PCB. 4 Verify that PS10 is working correctly and not excessively dirty (clean if necessary). Also verify that the wiring harness is firmly seated into both the sensor assembly and into connector J206 of the developing PCB. 5 Verify that PS11 is connected and functioning properly 6 Verify that all connectors to the developing PCB and the DC controller PCB are firmly seated.
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Control panel messages 29
54.3 Printer error
The printer is NOT receiving data back from the density sensor (PS14). PS14 is located in the bottom of the imaging drum drawer. During calibration routines, a series of images are written on the imaging drum and the densitometer measures the density of the image (i.e. the amount of toner that is placed into the drum). These measurements provide the feedback to ensure image quality is consistent throughout the life of the consumable. 1 Verify that the densitometer is clean; perform the toner density sensor cleaning procedure in the online user guide that came with the printer. 2 Inspect the density sensor wiring harness for damage. The harness runs from the density sensor through the left-side upper control arm of the imaging drum drawer to J1010 of the DC controller PCB. Verify that the cable is firmly seated into the J1010 of the DC controller PCB. 3 If the error persists, replace the density sensor assembly.
54.4 Printer error
Optional equipment is not recognized. · Turn the printer off and on to reset the printer.
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54.5 Printer error
This message indicates a waste toner sensor malfunction. 1 Turn the printer off and on to reset the printer. 2 Remove the drum cartridge and clean the waste toner detection window with a dry cloth. 3 Clean the waste toner sensor unit at the printer side with a dry cloth. 4 Check the light guide and clean if necessary. Replace if the ends are scarred. 5 Reconnect the waste toner sensor unit connector and the DC controller PCB connector (J1009) correctly. 6 Replace the waste toner sensor (PS13).
1
54.6 Printer error
The OHT sensor has reported an error condition. This can be caused by contamination in the connectors, a blocked sensor, or a defective sensor. 1 Remove the ITB and verify that the OHT sensor prism is in place. 2 Lift the registration flap and verify that the OHT sensor is not blocked. 3 Remove the ITB drawer and inspect the drawer connectors for contamination such as a piece of paper. 4 If the error persists, verify that all connectors are firmly seated. 5 Replace the ITB drawer.
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Control panel messages 31
55 DC controller error
The print engine is not communicating with the formatter. The communication link between the formatter and DC controller was lost. This can occur due to a timing error or intermittent connection between the formatter and the DC controller. 1 Turn the printer off and on to reset the printer. 2 Reseat the connectors between the formatter and DC controller. 3 Only if the error persists, replace the DC controller making sure to perform the calibration and color plane alignment procedures.
57.1 Fan failure
The printer detected that the fan (an exhaust fan located in the upper, left-rear corner of the printer) was not rotating. This fan operates off +24 Vdc and is enabled by the DC controller PCB's microprocessor. 1 Turn the printer off and on to reset the printer. Visually check to see if the fan is rotating. (If you cannot see any rotation, place your hand over the outlet vents to see if exhaust air is moving). 2 Remove the printer's left-side cover. Check to see if anything is preventing the fan from rotating freely. 3 Verify that the fan's connector is firmly seated into connector J208 of the developing PCB. 4 If the error persists, replace the fan.
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57.2 Fan failure
The printer detected that the fan (an exhaust fan located in the upper, right rear corner of the printer) was not rotating. This fan operates off +24 Vdc and is enabled by the DC controller PCB's microprocessor. 1 Turn the printer off and on to reset the printer. Visually check to see if the fan is rotating (if you cannot see any rotation, place your hand over the outlet vents to see if exhaust air is moving). 2 Remove the printer's left-side cover. Check to see if anything is preventing the fan from rotating freely. 3 Verify that the fan's connector is firmly seated into connector J209 of the developing PCB. 4 If the error persists, replace the fan.
1
57.3 Fan error alternates with Close upper front drawer
The intake fan is located in the front center of the drum drawer. (The drum drawer is referred to as the upper front drawer for end users.) Fan rotation stops when the drawer is opened. A fan error is displayed when fan motion is NOT detected by the DC controllers microprocessor if the drawer is closed and the printer is not in PowerSave mode. 1 Turn the printer off and on to reset the printer. Due to the difficulty of observation, listen to hear if the fan is rotating. 2 Verify that FM3 connector 27 is not damaged or broken. 3 Verify that the fan connector is firmly seated into connector J1022 of the DC controller PCB. 4 If the error persists, replace the fan.
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Control panel messages 33
62 No system
This message indicates that there is a printer firmware problem. Either there is no firmware DIMM installed or the DIMM has failed. If the formatter was just replaced, make sure all DIMMS have been moved from the old formatter to the new one. 1 Turn the printer off and on to reset the printer. 2 Reseat the firmware DIMM, making sure the it is in the slot surrounded by a white line with the text "ROM ONLY IN THIS SLOT."
62.x Printer error
This message indicates that a problem exists with the internal memory. x = Description 0 = Internal memory 1-3 = DIMM slots 1-3. 1 Turn the printer off and on to reset the printer. 2 Reseat and then replace the DIMM. 3 Replace the formatter board.
62.m Bad MPTR
The firmware ran out of memory trying to build the static entity directory. 1 Check the printer settings to determine which values have been changed. 2 Clear the message by pressing GO.
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68 NVRAM error check settings
One or more settings saved in the non-volatile storage device are invalid. Some settings may have been reset to factory defaults. 1 Check the printer settings to determine which values have been changed. 2 Clear the message by pressing GO.
1
68 NVRAM full check settings
This message indicates that a non-volatile storage device is full. Some settings may have been reset to factory defaults. 1 Check the printer settings to determine which values have been changed. 2 Clear the message by pressing GO.
79 Service (xxxx) printer error
A hardware error has occurred. x = Description 01xx = IO ASIC register error 02xx = video ASIC register error 03xx = IDE ASIC register error 1 Reseat the formatter. 2 Reseat the firmware DIMM. 3 Run formatter diagnostics. 4 Replace the firmware DIMM. 5 Replace the formatter.
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Control panel messages 35
80 Service (xxxx) EIO error
A critical EIO failure has occurred. X indicates the slot number of the device and xxxx indicates the error type. 1 Turn the printer off and on to reset the printer. 2 Reseat the EIO card. 3 Replace the EIO card.
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Troubleshooting paper path problems
Paper jams
Paper jams are posted if paper fails to arrive at or clear the paper path sensors in the allowed time. Dedicated paper sensors (PS2, PS7, PS3101, PS3103, and PS3104) detect whether paper is present in the sensor and if the paper is fed normally (see the figure below). When the control board detects a paper jam, it immediately stops the printing process and displays the appropriate paper jam message for the sensor that detects the paper jam.
1
5 4
1
2 3
Paper jam sensors (shown with the optional 500-sheet paper feeder and duplex unit installed) 1 Registration paper sensor (PS2) 2 Duplex paper-pick sensor (PS3104) 3 Reversed unit paper sensor (PS3103) 5 Delivery paper sensor (PS7) Troubleshooting paper path problems 37 4 Reversed paper sensor
(PS3101)
EN
Paper jam locations
Use the figure below to troubleshoot paper jams in the printer. For instructions on clearing paper jams, see the sections later in this chapter.
8 1 7 6 2 3 4 5
Paper jam locations (shown with the optional 500-sheet paper feeder and duplex unit installed)
1 2 3 4
Input tray 1 area Transfer belt area Input tray 2 area Front duplex drawer area
5 6 7 8
Tray 3 (500-sheet paper feeder) area Rear duplex cover area Fuser area Rear paper path area
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General paper path checklist
· · · · Verify that media is correctly loaded in the input trays and that all length and width guides are set correctly. Clean the printer. Toner and paper dust in the paper path inhibits free movement of media through the printer and blocks the sensors. Vary the input and output selections of the printer to determine if the problem is associated with a particular area of the printer. Worn separation pads on the multi-purpose tray cause multifeeds. Check the condition of the pickup rollers and customer replaceable feed roller. Bent separation tabs cause misfeeds and multifeeds. Replace the tray if necessary. Defective paper tray switches can cause paper jams by indicating the wrong size paper to the formatter. Scraps of paper left in the paper path can cause intermittent paper jams. Always check that the paper path is clear when cleaning the printer and when clearing paper jams. Also, remove the fuser and carefully check it for jammed paper. Scraps of paper may be difficult to find in the following areas. · · · · The ITB drawer connector on the engine side The OHT sensor under the registration plate The fuser (Remove the fuser and check it carefully.) The web transport (Paper scrapes are sometimes found in the center of the web transport before the fuser.)
1
· ·
·
EN
Troubleshooting paper path problems
39
Print media checklist
Many print problems are caused by printing on media that does not meet specifications. See "Supported media weights and sizes" on page 74 and the HP LaserJet Printer Family Paper Specification Guide for detailed information about media specifications. In addition, the following list helps to quickly check common media-related printing problems. · · · Rough paper causes poor transfer and smeared print problems. Check that the paper meets specifications for smoothness. The printer handles only 60 to 159g/m2 (16 to 42-pound) bond media, and 0.13 mm (5-mil) thick transparencies. Paper that has absorbed moisture causes paper feed problems. If the printer is used in a humid area, suspect damp paper as a cause of recurring paper feed and print quality problems. Damaged paper, paper with ragged edges, or paper whose edges stick together cause paper jams. Using paper that has already been through a laser printer or a copier could cause paper jams.
· ·
CAUTION
Using media that does not conform to the specifications listed here or in the HP LaserJet Family Paper Specification Guide can cause problems that require service. This service is not covered by the Hewlett-Packard warranty or service agreements.
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2
Note
Service tools
Overview
This chapter provides information on service tools that service personnel can use to verify and manipulate internal printer settings and diagnostics.
Only authorized service personnel should use the service mode.
EN
Overview
41
Cold Reset
Cold reset clears all data from the print buffer and returns the printing menu and the configuration menu to the factory default settings.
To perform a cold reset
Select RESTORE FACTORY DEFAULTS from the Reset menu.
Service mode
Service mode allows for the modification of page counts and certain registration values for the printer. When the configuration page is printed while in service mode, all event log messages are printed as well. If both the formatter and DC controller are replaced at the same time, service mode will need to be utilized to execute the color plane registration sequence to ensure optimum print quality.
To access service mode
1 Hold down the CANCEL JOB key and SELECT key while turning the printer on until the display is blank and the 3 LEDs are on. 2 Press the right side of the MENU key, and then press the SELECT key. Service mode will be displayed on the front panel briefly followed by two rows of asterisks. The printer will go through its normal start up cycle then display SERVICE MODE on the front panel. 3 Press the MENU key to access the Service menu.
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Service menu
Serial number=
Cyan registration= Magenta registration=
Transfer maint count= Fuser maint count= Color page count= Total page count= Cold reset paper= Clear event log
2
Yellow registration= Top margin=
Tray 1 left margin= Trays 2 and 3 left margin=* Print registr'tn page tray=
get
Service mode menu map
EN
Service mode
43
Service menu items
The Service menu provides the options listed below. Press the ITEM key to scroll through the Service menu. · · · · · · · · · · · · · · Serial number Transfer maintenance count Fuser maintenance count Color page count Total page count Clear event log (see page 72) Registration page (see page 45) Diagnostics mode (see page 49) Paper path test (see page 52) Developer test (see page 53) Drum test (see page 53) Door sensor test (see page 56) Formatter diagnostics (see page 50) Engine test (see page 57)
See the page number referenced opposite the item for more details.
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Registration page
Note
The setting of the registration values must be done if both the formatter and DC controller are replaced at the same time. If only one is replaced, the registration values are copied from the other.
Printing a registration page
1 Scroll through the Service menu until PRINT REGISTR'TN PAGE is displayed. 2 Select the paper tray to pull paper from (only when setting left side margins will the tray actually matter). 3 Press SELECT to print the registration page.
2
EN
Service mode
45
Registration page
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Setting registration numbers
On each of the color bars in the process section are bolded numbers that indicate the current number set on the control panel. These bolded numbers will always be in the middle of the bars. To set the correct value for each of the colors, look at the lines within the bar and find the grouping that has the color line directly on top of the black line (it will have more white space). Print at least five registration pages to see if the new settings are correct.
Note
Using a magnifying glass to look at the lines will help in selecting the best number. Setting the registration number: 1 Use the ITEM key to select the appropriate color (cyan, magenta, or yellow) to view or change its registration number. 2 Press the + VALUE - key to change the registration number to the one identified. 3 Press the SELECT key to enter the value.
2
Setting margin numbers
The top margin number is not tray dependent like the left side margin. You can print the registration page from whichever tray has paper. Using a ruler, measure from the top edge of the paper to the series of lines. Find the line that is 13 mm (0.5 in) away from the edge of the paper. Setting the top margin registration value: 1 Press the ITEM key to scroll through the Service menu until top margin is displayed. 2 Press the + MENU - key until the number to be entered is displayed. 3 Press the SELECT key to enter the number. Print another registration page and the number just entered will align with the arrow and be bolded.
EN
Service mode
47
The left-side margin setting is tray dependent. Tray 1 has its own number while Trays 2 and 3 are combined. The procedure is the same as the top margin with one exception. The page must be printed from the tray that will be adjusted. Printing from Tray 1: 1 Press the ITEM key until PRINT REGISTR'TN PAGE TRAY = 1 (default) is displayed. 2 Press the SELECT key. 3 Measure from the left side of the paper to the lines and find the line that is 13 mm (0.5 in) from the edge of the paper. If the number for the line is different then the current number: 1 Press the ITEM key until TRAY 1 LEFT MARGIN = # is displayed. 2 Press the + VALUE - key to change the number to the number required. 3 Press the SELECT key. Printing from Tray 2 and 3: 1 Press the ITEM key until PRINT REGISTR'TN PAGE TRAY = 2 or 3 is displayed. 2 Press the SELECT key. 3 Measure from the left side of the paper to the lines and find the line that is 13 mm (0.5 in) from the edge of the paper. If the number for the line is different then the current number: 1 Press the ITEM key until TRAY 2 AND 3 LEFT MARGIN = # is displayed. 2 Press the + VALUE - key to change the number to the number required. 3 Press the SELECT key.
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Diagnostics mode
This section provides an overview of the diagnostic tools incorporated into the HP Color LaserJet 4500/4500 N/4500 DN printer.
CAUTION
Use caution when performing printer diagnostics to avoid risk of injury. Only trained service personnel should access the diagnostic mode with the skins removed. There are two diagnostic sections built into the firmware, one for the formatter and the other for the engine. Each section contains different tests that allow the service technician to verify printer functionality. While in diagnostic mode there are no error messages associated with these tests. Therefore, determination of the problem will rely on the technicians skill. To exit diagnostic mode, turn the printer off.
2
Accessing diagnostics
· To access the diagnostics mode, hold down the ITEM key and turn on the printer.
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Diagnostics mode 49
Formatter diagnostics
Formatter diagnostics are designed to be used by qualified service personnel. This set of tests are designed to thoroughly test the functionality of the formatter. If all the tests pass, the formatter is working correctly and it is likely that the problem resides elsewhere. Listed below are descriptions of the formatter tests available.
CAUTION
NVRAM can be lost if the printer is turned off during testing.
Formatter diagnostics
Test REPEAT ON FAULT Description If set to yes, the tests will run continuously until interrupted The following will occur for each setting: BREAK the test will stop when a failure occurs PAUSE stops the test for a short period of time then resume with the remaining tests CONT continues to execute the tests even when a failure occurs Tests the firmware ROM for correct functionality Tests the on-board RAM and the DIMMs Tests the SRAM inside the ASIC Tests the SRAM physically mounted on the formatter Tests the formatter NVRAM. This test takes 15 minutes to run and should only be used when NVRAM values are being lost. In almost all cases, this test should never be run
ROM CRC DRAM SRAM 1 SRAM 2 NVRAM
EXECUTE TESTS Runs the selected tests
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Engine diagnostics
A good understanding of how the printer operates is required to use the engine diagnostics successfully. To have a better view of the areas being exercised, remove the left-side cover and the ITB drawer. Defeat the two ITB drawer switches located on the left side of the drawer cavity. Listed below are the diagnostics available and a brief description of what the diagnostic will do.
2
Engine diagnostics
Menu item Continuous Selectable value N (default) Y Paper Path Test Description Selected test runs once. Selected test runs in a continuous loop. Turns on the motors that control the paper path section of the printer. Rotates the carousel and the developers. Turns on the drum drive motor that drives the drum and ITB. Displays the state for each of the paper path sensors and switches. Displays the state for each of the door and drawer switches.
Developer Test Drum Test
Path Sensors
Door Sensors
EN
Diagnostics mode 51
Paper path test
Note
If an error occurs during the paper path test, the message PATH_1PAPER PATH TEST FAILED displays. 1 Press the ITEM key until you see ENGINE DIAGS PAPER PATH TEST. 2 Press the SELECT key to activate the test. While the test is running ENGINE DIAGS E1:PAPERPATH displays in the front panel. The test takes approximately 15 seconds to run. Components exercised by the paper path test include the fusing motor (M1), paper path motor (M2), and associated gears and assemblies. The paper pick roller for tray 2 can be activated by manually activating the paper pick solenoid (SL2). This test will not pick paper and move it through the paper path. To test this function, run a configuration page. For multiple pages, select CONTINUOUS CONFIGURATION PAGE in the control panel. The paper path test allows the service technician to verify the operation of components within the paper path. When the test is initiated, both M1 and M2 are activated. You will see the ITB lift cams rotate once and the ITB drive gear turn briefly. The remaining portion of the test allows both M1and M2 to run, thus exercising the associated gears and rollers.
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Developer test
The developer test rotates the carousel stopping at each toner cartridge and rotating the developer sleeve. For the best view of the carousel and the toner cartridge sleeves, remove the drum cartridge. The drum drawer must be closed before the test can run. 1 Press the ITEM key until ENGINE DIAGS DEVELOPER TEST is displayed. 2 Press the SELECT key to run the test. The front panel displays ENGINE DIAGS E2:DEVELOPER while the test is running. Watch the carousel and make sure that the toner cartridge developer sleeve rotates. The sequence is black followed by a pause, then magenta, cyan, and finally yellow. The test takes approximately 35 seconds. While the developer test is running you will see the drum turn if it is installed, as well as the drive gear for the ITB.
2
Drum test
The drum test exercises the drum drive mechanism. In addition, the fuser motor is turned on to allow the lift cams for the ITB to be rotated into the ITB up position. 1 Press the ITEM key until ENGINE DIAGS DRUM TEST displays. 2 Press the SELECT key to run the test. The front panel displays ENGINE DIAGS E3:DRUM while the test is running. Watch to see if the ITB lift cams turn and if both the drum drive gear and the ITB drive gear is rotating
EN
Diagnostics mode 53
Path sensors
The path sensors test allows the paper path sensors and switches to be tested for correct operation. The table below shows the correlation between the identifier on the front panel and the sensor or switch it represents.
Paper path sensors and switches
Identifier Name A B C D E F G H I J K L M N PS8 PS3 PS4 SW801 SW802 SW803 PS3001 SW3001 SW3002 SW3003 PS10 PS11 N/A PS9 Description Tray 2 paper detect sensor Tray 1 last piece of media pulled sensor Tray 1 paper detect sensor Tray 2 paper size switch 2 Tray 2 paper size switch 1 Tray 2 paper size switch 0 Optional Tray 3 paper detect sensor Optional Tray 3 paper size switch 2 Optional Tray 3 paper size switch 1 Optional Tray 3 paper size switch 0 Carousel position sensor N/A 500-sheet feeder: 1=installed, 0=uninstalled Top output tray full sensor
1 Press the ITEM key until ENGINE DIAGS PATH SENSORS is displayed on the front panel. 2 Press the SELECT key to activate the test. The front panel will display A through N with a binary value below it.
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When running this test, make sure the ITB drawer is installed with Tray 2 and Tray 3 (if installed) removed. In this state, the default value on the front panel should be: 0X111111110010, where the x can be either 0 or 1. If there is any other value, then there is a possible problem. Identify the sensor or switch in the table above and test to see if the value changes. Cassette paper-size settings for each tray are described in the table below.
Paper-size settings
Paper Size A4 B5 Custom (A5) Custom (B5 ISO) Letter Executive Legal No tray installed Tray 2 switches (DEF) Tray 3 switches (HIJ) 000 001 010 011 100 101 110 111 000 001 011* 011* 100 101 110 111
2
* These values are the same for tray 3.
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Diagnostics mode 55
Door sensor test
The door sensor test allows service personnel to open and close doors on the printer while watching the sensor status on the front panel. Switches 4 and 5 are in series with each other, which causes the value to toggle under identifier A. Once the door sensor test is initiated, the front panel displays the status for each sensor listed in the table below. As a door is opened and closed, the state of the sensor changes the indicator values on the front panel.
Sensor status
Identifier Name A B C D E F SW4 and SW5 SW1 * SW2 * SW3 * Description Front and rear door switches ITB drawer switch Toner cartridge door * Drum drawer switch *
Drum detect Detect if a drum cartridge is installed Fuser Detects if fuser is installed. Changes the state of the sensor if not detected or removed when rear door is opened and closed.
* Activates (A) when opened. 1 Press the ITEM key until ENGINE DIAGS DOOR SENSORS is displayed on the front panel. 2 Press the SELECT key to activate the test. The front panel displays A through F with a binary value below it. All the doors and drawers should be closed. In this state, the display will show all 0's. Open the doors and drawers one at a time to verify correct functionality. If operating correctly, the 0 will change to a 1. If a 1 is displayed with all doors and drawers closed; there is a bad switch or connection.
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Engine test
The printer has one test pattern (vertical lines). When an image defect appears, a test print can be made to identify the problem. The test print can be made by pressing the test print switch located on the right side of the printer (see figure below). A test pattern can be printed by pressing the test print switch once after the photosensitive drum has stopped and the printer has entered the standby mode. If the switch is held down, the test pattern is printed continuously. The switch can be used when paper is loaded in any tray other than Tray 1. The engine test does the following: · · · · · Verifies that the print engine is functioning correctly (the formatter PCB is completely bypassed during an engine test). Isolates printer problems Checks and adjusts registration Prints from Tray 2 or 3 only, not from Tray 1 Can be activated with the formatter PCB removed
2
Note
For the printer to perform an engine test, Tray 2 or Tray 3 must be installed and loaded with paper, and the toner cartridges must be installed in the printer.
Engine test button
Location of the engine test button
EN
Engine test 57
NVRAM initialization
NVRAM initialization should always be executed after replacing firmware or the formatter board.
NVRAM initialization instructions
Before replacing the firmware, formatter board, or performing an NVRAM initialization be sure to gather and write down the information listed below. · · Serial number Total page count and color page count Print a configuration page to obtain both page counts and the serial number. · Percentage of life remaining for both the transfer kit and the fuser kit
1 2 3 4
MODE on the printer display panel, press MENU. MENU and press ITEM. Use the VALUE +/- keys to go to TRANSFER MAINT COUNT=XXXXXXX and write down the exact numbers shown. Go to FUSER MAINT COUNT=XXXXXXX and write down the exact
Go to SERVICE numbers shown.
From SERVICE
NVRAM initialization
1 Hold down both the CANCEL JOB and SELECT keys until all the LED lights are on, then release the keys. 2 Press CANCEL JOB. 3 Press SELECT.
NVRAM initialization results
· · · · 58 Loss of color page count (defaults to 0). Loss of transfer kit percentage of life remaining (defaults to 100%). Loss of fuser kit percentage of life remaining (defaults to 100%). Loss of printer serial number. Chapter 2 Service tools
EN
Firmware replacement results
Note
NVRAM initialization should always be executed after replacing firmware. See "NVRAM initialization instructions" on page 58. · · · · · · Loss of color page count (defaults to 0). Loss of transfer kit percentage of life remaining (defaults to 100%). Loss of fuser kit percentage of life remaining (defaults to 100%). Loss of printer serial number. If a NVRAM initialization is not executed when firmware is replaced, incorrect printer functionality may result. An NVRAM initialization aligns the firmware with the formatter.
2
Formatter replacement results
Note
NVRAM initialization should always be executed the first time the printer is turned on after replacing the formatter. See "NVRAM initialization instructions" on page 58. · Loss of both color and total page counts. If not done correctly the default is reset to 0. NVRAM initialization results in a correct total page count. If an NVRAM initialization is not done the total page count on the new formatter board (usually 0) is written to the engine. This results in an incorrect page count. · · · · · Loss of transfer kit percentage of life remaining (defaults to 100%). Loss of fuser kit percentage of life remaining (defaults to 100%). Loss of printer serial number. If a NVRAM initialization is not executed when formatter is replaced, incorrect printer functionality may result. An NVRAM initialization aligns the firmware with the formatter.
EN
NVRAM initialization
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3
Power supply
Overview
Three power supplies are used to power various sections of the printer: AC, DC, and a high-voltage power supply. This chapter details the distribution of these power supplies.
EN
Overview
61
AC/DC power supply
The low-voltage power supply circuit supplies +24 Vdc and +5 Vdc required for the printer and 3.3 and 5 Vdc required for the video controller. +24 Vdc · · The paper pickup motor, scanner motor, and high-voltage power supply PCB use +24 Vdc. The front door switch or the rear door switch is deactivated by opening the drum cartridge drawer, ITB unit drawer, toner cartridge door, or delivery door. These switches are in series and disable the 24 Vdc when open.
+5 Vdc · · The sensors and the ICs on the DC controller PCB use +5 Vdc. The low-voltage power supply circuit monitors the 5 VS (volt signal) fed back from the connector PCB to ensure the 5 V power supply to the formatter.
+3.3 Vdc · · · Formatter PCA DIMM EIO PCA
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Overcurrent overvoltage protection
Each DC power supply circuit has an overcurrent prote