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HITACHI COLOR LASER PRINTER
MODEL SL1
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MANUAL NO. :
MAINTENANCE MANUAL FOR HITACHI COLOR LASER PRINTER MODEL SL1
Hitachi, Ltd. Tokyo, Japan February, 27 , 1998
Read & Keep This Manual
· Read the safety instructions carefully, and understand the contents before starting the maintenance Work. · Keep this manual always available for reference.
Revision Control Table
No, 1 2 3 Date of Revision July 14, 1997 October 13, 1997 February 27, 1998 Revision Code First Edition Revision "A" Revision "B" Description of Revision First Edition (Original) First revision made and issued as Rev."A" First revision made and issued as Rev."B"
FCC Notice
WARNING
This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to Part 15 of FCC Rules. These limits are specified to provide the reasonable protection against harmful interference in a residential installation. Since this equipment generates, uses, and radiates the radio frequency, it may cause harmful interference to the radio communications if not installed or used in accordance with the instructions set out hereunder. However, there is no guarantee that such interference will not occur in a particular installation. If this equipment causes harmful interference to the radio or television reception, which can be checked and confirmed by powering the equipment off and on, the users are encouraged to correct the interference by taking one or more of the following countermeasures: 1 . Reorient or relocate the receiving antenna. 2 . Give more clearance between the equipment and receiver. 3 . Connect the equipment into the outlet of other circuit which is different from the one being used for the receiver. 4 . Consult the dealer or experienced radio/television technician for help.
Canadian Compliance
This digital apparatus does not exceed the Class B limits for radio noise emissions from digital apparatus set out in the Radio Interference Regulations of the Canadian Department of Communications. "Le presnt appareil numerique n'emet pas de bruits radioelectriques depassant les limites applicables aux appareils numeriques (de la Class B) prescrites dans le Reglement sur le brouillage radioelectrique edicte par le ministere des Communications du Canada."
(i)
Product Safety
Laser Product
SL1 is certified as a Class 1 laser product and complies with DHHS Laser-Radiation Standards, 21 CFR Chapter 1, Subchapter J.
Caution
Use of controls, adjustments or performances of procedures other than those specified in this Manual may result in hazardous radiation exposure.
Ozone Gas
Caution
SL1 is provided with the ozone filter in order to reduce exhausted ozone in compliance with Product Safety Standards. Ozone filter must be replaced with new filter yearly, otherwise, it may cause strong odor which will likely have ill effects to bronchial tubes. Therefore, this periodical replacement with new filter must be strictly respected.
Documentation Disclaimer
HITACHI, LTD. MAKES NO REPRESENTATION OR WARRANTIES OF ANY KIND WHATSOEVER WITH RESPECT TO THE CONTENTS HEREOF AND SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE.
(ii)
SAFETY INSTRUCTIONS
1. Safety Instructions
1.1 Safety Principle (1). Before starting your operation, read this Manual thoroughly. Especially, read the safety instructions of this section carefully and understand the contents. (2). Perform all the operations by following the procedures described in this Manual. Follow all the cautions and warnings set out in the procedures and on safety labels affixed on the machine. Failure to do so may result in the human injuries or equipment damages. (3). Perform only the procedures explained in this Manual. Refrain from opening or touching any portions that are not related with your operation. (4). Repair and replacement of parts should be performed by trained and qualified persons only. Operator should not attempt to do such repair or replacement works. (5). It must be appreciated that above-mentioned cautions and warnings do not cover everything, because it is impossible to guess or evaluate all the circumstances beforehand.
1.2 Special Safety Information (1). Introductory Information The cautions and warnings are made clear by following the "Safety Alert Symbol" or "Signal Words" such as DANGER, WARNING and CAUTION. 1 . Safety Alert Symbol This is the safety alert symbol. When you find this symbol placed on your equipments or marked in this Manual, be alert for the potential of human injuries. Follow the recommended precautions and safety operation practices.
(iii)
(1). Introductory Information (..... continue) 2 . Understanding Signal Words DANGER is used to indicate the presence of a hazard which will cause severe human injuries or fatal accident if the warning is ignored. WARNING is used to indicate the presence of a hazard or unsafe practices which may cause severe human injuries or fatal accident if the warning is ignored. CAUTION is used to indicate the presence of a hazard or unsafe practices which may cause minor human injuries if the warning is ignored. CAUTION also calls attention to safety messages in this Manual. 3 . Follow Safety Instructions Carefully read all the safety messages set out in this Manual and also in the safety signs placed on your equipments. In this Manual, the safety instructions (safety alert symbols and signal words) are bracketed by rectangular enclosure to call for attention. Keep the safety signs in good condition without missing or damage. Replace the safety signs if smeared or damaged. Learn how to operate the equipment and how to use the control properly. Do not let anyone operate without acknowledging the instructions. Keep the equipments in proper working condition. Unauthorized modification to equipments may impair the function & safety, and affect the life of equipments. Listed below is the various kind of "WARNING" contained in this Manual.
WARNING
HAZARDOUS VOLTAGE
It may cause serious injuries or fatal accidents. Voltage is now applied from the power supply of printer. There is the danger of electrical shock if you touch the active area inside the printer. Make sure to turn the power supply switch OFF and pull out the plug from the outlet before starting maintenance work to printer.
(iv)
3 . Follow Safety Instructions (.... continue)
WARNING
HARMFUL OZONE GAS
Inhalation of excessive amount of ozone gas may adversely affect the respiratory organs. Ozone Filter is provided to this printer to reduce the exhausted ozone. This filter must be replaced with new filter periodically in accordance with the Manual attached to this printer. Listed below are the various kinds of "CAUTION" contained in this Manual.
HOT SURFACE
Can cause a burn.
Fusing Unit is approx.160 C hot , so that perimeter is also very hot. When you need to change the cleaning pad or remove jammed papers, wait about 20 minutes after opening up the paper exit unit and confirm the unit to be well cooled down.
CAUTION
ROTATING PARTS
Be cautioned about the potential danger of various rollers to get your fingers or hand caught into the machine and cause serious injuries. Note that the exit roller ejecting printed papers is rotating while printing. Be careful not to get your hairs, fingers, hands, and sleeve or necktie caught in the machine while operating the machine.
(v)
3 . Follow Safety Instructions (.... continue)
CAUTION
HAZARDOUS POWDER
Toner is fine powder to cause powder explosion if dumped into the fire. Strictly refrain from dumping toner into the fire for disposal.
CAUTION
HAZARDOUS POWDER
Toner is fine powder to cause troubles to eyes and respiratory organs if inhaled. Handle carefully toner cartridge, waste toner pack and developing unit not to spread the toner.
CAUTION
POWER CORDS & PLUGS
This printer is equipped with 3-wire power cords and 3-pronged plugs (bi-polar plug with grounding) for the user's safety. Use these power cords in conjunction with properly grounded electrical receptacles to avoid an electrical shock.
CAUTION
SAFETY INTERLOCK
Cover and Paper Delivery Unit of this printer have electrical safety interlocks to turn the power off whenever they are opened. Do not attempt to circumvent these safety interlocks.
(vi)
CONTENTS PREFACE and SAFETY INSTRUCTIONS 1. OUTLINE OF PRODUCT 2. SPECIFICATIONS OF PRODUCT 3. INSTALLATION 4. STRUCTURE OF EACH COMPONENT SYSTEMS 5. PERIODIC MAINTENANCE 6. OPERATION AND ADJUSTMENT OF OPERATOR PANEL 7. REPLACEMENT OF MAINTENANCE PARTS 8. TROBLESHOOTING 9. PARTS LIST
1. Outline of Product . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1 1.1 Name & Function of Each Parts . . . . . . . . . . . . . . . .1-1 1.2 Internal Structure . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3 1.3 Description of Operator Panel . . . . . . . . . . . . . . . . .1-4
1. Outline of Product
1.1 Name & Function of Each Parts
Operator Panel Top Cover
Paper Exit Cover
Main Switch
Front Cover
Paper Cassette
[Front Face]
Paper Exit Unit
Interface Connector Box
Back Cover(L)
AC Input Inlet
[Back Face]
1-1
No.
Name of Parts
Outline of Functions To act as an upper enclosure and also a paper tray for printed papers.
1
Top Cover
2
Operator Panel
To display a status of printer operation and motion. To act as a front enclosure, and to be opened when replacing a toner cartridge or waste toner pack. To exit a printed paper onto a top cover, acting also as paper tray for printed paper. To be opened when replacing an OPC belt cartridge. To operate power-on and off of printer. (Pushing for On/Off operation)
3
Front Cover
4
Paper Exit Cover
5
Main Switch
6
AC Input Inlet
To connect a power supply cable.
7
Back Cover (L)
To act as a rear enclosure, and to be opened when clearing an internal jam or doing a maintenance work.
8
Interface Connector Box
Space where a controller PWB to be installed.
1-2
1.2 Internal Structure
Fusing Unit Drum Cleaner Belt Cartridge Toner Cartridge @(K,Y,M,C)
K Y M C Paper Discharger Transfer Roller Transfer Drum Paper Cassette Optical Unit
Transfer Unit
Paper Pick Up Roller
No. 1 2 3 4 5 6 7 8 9 10 11
Name of Components Toner Cartridge Belt Cartridge Drum Cleaner Fusing Unit Transfer Unit Transfer Drum Paper Discharger Transfer Roller Paper Cassette Paper Pick Up Roller Optical Unit
Outline of Functions To contain the toners (K, Y, M, C) for developing. Each toner cartridge of K,Y, M, C is independent. To form images, including the OPC belt. To clean and collect waste toner adhering to the transfer drum. To fuse by heat the toner images on the paper. To transfer toner images from the transfer drum to the paper. To form color images, maintaining the toner images of OPC belt on the drum. To emit the corona for separating a paper from transfer drum. To transfer the toner image of transfer drum to a paper. To feed papers automatically. To feed papers automatically from the paper cassette. To generate a laser beam and scan over the OPC belt.
1-3
1.3 Description of Operator Panel (1) Standard
` a b c d e f g h i j k l m n o P Q R S T U V W X O P Q R S T U
1
3 2 4
MESSAGE ONLINE MEDIA
5 7
FREE SIZE CLEAR
6 9
8 11
SELECT
10
12
Description: 1 2 3 4 5 6 7 8 9 10 11 12 LCD:16 characters by 2 lines Message LED Online LED Media LED Online Key Media Select Key Free Size LED (Red) Free Size Key Clear Key Select Key Scroll Key (Left) Scroll Key (Right)
1-4
2. Specifications of Product . . . . . . . . . . . . . . . . . . . . . . . .2-1 2.1 Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1 2.2 General Specification . . . . . . . . . . . . . . . . . . . . . . .2-2 2.3 Environmental Condition . . . . . . . . . . . . . . . . . . . . .2-5
2. Specifications of Product
2.1 Rating
WARNING
Use the power supply cord provided as an accessory, or the similar cord complying with following specification (3-wire power cord with grounding). Use of the "out of specification" cord may result in the electric shock.
Name of Model SL1-U SL1-E SL1-J
Voltage (V) Frequency (Hz) Input Current (A) 120 50/60 8 220 - 240 50/60 4 100 50/60 10
Power Cord (Piece) 1 (Standard) Not included. *1 1 (Standard)
*1: As to SL1-E, customers are requested to purchase and use the power cord complying with the following specifications.
Figure Name of Model A B
Rating
H05VV-F3G0.75 250VAC, 6A H05VV-F3-0.75 250VAC, 6A
Approval Agency Applicable Area VDE, OVE, SEMKO, CEBEC, Europe NEMKO, DEMKO, FIMKO (Continent) BS UK
Rating label of SL1-U Rating label of SL1-E Fig.A: Power Cord for Europe
2.5m
Fig.A: Power Cord for Europe
2.5m
2-1
2.2 General Specification
No.
Item
Description
1
Printing Method Print Speed a). Monochrome b). 2 (two) Color c). 3 (three) Color d). 4 (four) Color Warming-Up Time
Semiconductor Laser and Electrophotography Cassette Feed and Continuous Print: a). 16 sheets per minutes (Letter size) b). 8 sheets per minutes (Letter size) c). 5.3 sheets per minutes (Letter size) d). 4 sheets per minutes (Letter size) 210 seconds (max.), 180 seconds (Normal)
2
3
4
Resolution
600dpi
5
Feeding Method
Cassette Feed Ordinary Paper: 250 sheets, OHP: 50 sheets Envelope: 30 envelopes, Post Card: 50 cards Letter, Legal, Executive (A4, B5), OHP, Label, SPHINX Face Down, 250 sheets (capacity) 500 (W) 19.7 (W) 490 (D) 19.3 (D) 388 (H) (unit: mm) 15.3 (H) (unit: inch)
6
Cassette Capacity
7
Printable Media
8
Paper Exit System
9
External Dimension
10
Weight of Printer
Approximately 36kg (79 pounds)
2-2
Table 2-1: Characteristics of Hitachi Paper
Item
Description
Basis Weight (g/m2)
82 5
Thickness (
m)
95 6
Smoothness (Bekk) (seconds) Stiffness (Clark)
90 20
100 15
Brightness (%)
85 2
Surface Resistance (
)
1010
1011
Grain Direction
Long
Measurement Condition: 17.5
27.0 C , 50
70%RH
[Note]: Keep the paper sealed, and do not open the paper bag until using the papers.
2-3
Table 2-2: Characteristics of Hitachi Recommend Paper, OHP Sheet, and Label
Media Item Basis Weight (g/m2)
Paper Xerox 4024 75 4
Paper Hammermill Laserprint (white) 90 4
Label Avery 5260 163 7
OHP Sheet
SPHINX Auto Fil #1914 90 4
142 4
Thickness (
/m)
102 6
105 6
184 7
110 6
125 10
Smoothness(Bekk)
35 4
120 20
20 6
500 100
22 10
Stiffness (Clark) Surface Resistance 109 ( ) L* CIE LAB L*a*b* b*
100 15
90 15
65 15 10 10
56 15 1000 1000
70
20
10
100
10
100
1
100
1
100
94 2
94 2
93 2 80%
a*
0.4 1
0.5 1
0.2 1 (Transmittance)
1.6 1
2.2 1
4.5 1
Brightness (%)
80 2
85 2
77 3
82
5
Grain Direction
Long
Long
Long
: Printed Side : Back Side Measurement Condition: 17.5 27.0 C , 50 70%RH
2-4
2.3 Environmental Condition
(1). Ambient Temperature / Humidity / Altitude: (a). Under Operation: 10.0 32.5 C , 20 (See the figure below.) 80%RH
80
Humidity (%RH)
70 60 50 40 Recommended Condition; 17.5 27 C 50 70%RH
Ambien
20
0
10 17.5 20 27 30 Ambient Temperature ( C)
32.5 40
(b). Under No Operation: 5.0 ~ 35.0 C , 10 ~ 80%RH (See the figure below.)
80
Ambient Humidity (%RH)
60
40 30 20 10 0 5 10 20 Ambient Temperature( C ) 30 35 40
2-5
(c). Storage and Transportation Environment of Printer The following defines the storage and transportation environment of the printers that have been packed according to Hitachi specification. However, this section does not cover the belt cartridges, toner cartridges and developer cartridges. In particular, since consumables such as toner etc. are packaged, the following environmental conditions should be respected. During transportation, strictly refrain from leaving the goods on the ground or under the blazing sun.
Normal Condition Temperature Severe Condition
0 C ~ 35 C (32 F ~ 95 F)
High Temperature: 35 C ~ 40 C (95 F ~104 F)
Low Temperature: 10 C ~ 0 C (14 F ~ 32 F)
Humidity
10% ~ 90%RH
Period of Storage
One Year
Other
No Condensation
Atmosphere
613 ~ 1,067hpa (460 ~ 800mmHg)
The period under the severe condition should not be continuous, but assumed as accumulation of intermittent time. However, the accumulation of intermittent time should not by any means exceed 48 hours at maximum. [Note]: Normal condition should occupy more than 90% of total storage period. Sever condition should be less than 10% of total storage period.
2-6
3. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1 3.1 Conditions for Installation . . . . . . . . . . . . . . . . . . . .3-1 3.2 Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2 3.2.1 Unpacking of Printer . . . . . . . . . . . . . . . . . . . . .3-2 3.2.2 Unpacking of Starter Kit . . . . . . . . . . . . . . . . . .3-4 3.3 Installation Work . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5 3.3.1 Installation of toner cartridge to the printer . . . . .3-5 3.3.2 Installation of OPC Belt Cartridge . . . . . . . . . . .3-6 3.3.3 Installation of Cleaning Roller and Oil Bottle . . .3-7 3.3.4 Test Run and Test Print . . . . . . . . . . . . . . . . . . .3-8
3.
Installation
3.1 Conditions for Installation Laser beam printer is likely influenced by the environment of set-up location. IF Printer was set up at the inappropriate location, the printer may not perform the characteristic functions as expected. Therefore, the following factors should be taken into consideration prior to deciding where to set. (1). Environmental Conditions Printer should not be set up at the locations referred to by the following items (a) through (d) specifying the inappropriate locations for set-up. (a). Likely to receive the direct sunbeam or similar light. (For example, window side) (b). Likely to cause the big difference in temperature and humidity between the maximum and minimum level. (Normal operation environment is within 10 C ~ 35 C , 20 ~ 80%RH and without any condensation.) (c). Likely to receive cold wind from air-conditioner or worm wind from heater, or to receive direct radiant heat. (d). Likely to cause much dust or have corrosive gas like ammonia. (e). Users to select the location of good ventilation and set a printer on the flat surface. (f). Users to check the maximum tilt of set-up location to be within 1 . (2). Basic Layout of Printer Set-Up Location Fig.3-1 shows the basic layout of printer set-up location suitable for the smooth operation and maintenance of printer.
10cm(4")
40cm(16")
70cm(28")
Paper Exit Side
10cm(4")
[Fig.3-1]
3-1
Front Side
3.2 Unpacking
WARNING
·The package containing a printer weighs approximately 40kg, so that it is too heavy for one person to carry. It needs more than two adults to move the printer. Since this printer is a precision machine, ensure to carry it slowly with good care so that no impact shall be given to the printer while moving. ·Do not attempt to hold a printer as covered by vinyl sheet, because it is slippery and results in damage and injury if dropped from your hand.
3-2-1 Unpacking of Printer (Fig.3-2)
1 . Cut the bands (2 pcs.) binding the package. 2 . Remove the plastic joints 17 (4 locations). 3 . Remove the tape 18 binding the top of package. 4 . Open up the top of package to take the starter kit out. 5 . Lift the outer box 1 up for removal. 6 . Remove the top partition packing 3 . 7 . Take the power cable out. 8 . Open up the vinyl sheet 5 covering the printer body. 9 . Lift up the printer body with another person's help, and lay it on the floor. 10 . Set up the printer on the suitable location. 11 . Remove the tape 8 fixing the paper cassette. 12 . Remove the protective tape 9 (1 location).
3-2
No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
NANE OF PARTS Q'TY OUTER BOX 1 BASE 1 UPPER PACKING 1 SILICA GEL (EN) 1 POLYETHYLENE BAG (EN) 1 POLYETHYLENE BAG (ST) 1 ST KIT TAPE 4 TAPE 1 PR TAPE 1 STARTER KIT PACKING (U) 1 STARTER KIT PACKING (L) 1 SILICA GEL (ST) 2 POLYETHYLENE BAG (T) 4 POLYETHYLENE BAG (CL) 1 POLYETHYLENE BAG (OIL) 1 POLYETHYLENE BAG (OPC) 1 JOINT 4 OUTER BOX TAPE 1
Band o h
X ^ [ ^ L b g
3-3
14
9
d ,, P [ u
8
Fig.3-2:Unpacking of Printer Package
x [ X
3-2-2 Unpacking of Starter Kit Procedure of Unpacking 1 . Open up the vinyl sheet covering the starter kit. 2 . Confirm all of the following kits to be inside the starter kit's packing box.
No.
Name of Kit
Appearance
Y (Yellow) M (Magenta)
Quantity
1
Toner Cartridge (Y.M.C.K)
C (Cyan) K (Black)
4
2
OPC Belt Cartridge
1
3
Oil Bottle
1 set.
Cleaning Roller
4
Cleaning Roller
Spuit
1
3-4
3.3 Installation Work
Install the unit parts of starter kit to the printer according to the following procedures: 3.3.1 Installation of OPC Belt Cartridge: (Fig.3-3 ~ 3-6)
PRECAUTION
Do not directly touch the OPC belt surface with bare hands or gloves.
If OPC belt is exposed for more than two minutes under the light of 800 lux, the belt may be defective.
Procedures of Installation 1 . Open the front cover. 2 . Open the paper exit cover. 3 . Erect the lock lever BC provided at both sides (left and right).
Paper Exit Cover
Front Cover
[Fig.3-3]
Lock Lever BC (Left)
Guide
Lock Lever BC (Right) Lock Lever BC
4 . Pull and remove the tension release pins of both sides (left & right). 5 . Remove the protective sheet from a new belt cartridge. 6 . Push the new belt cartridge into the printer, along the guide of lock lever BC provided at both sides.
3-5
[Fig.3-4]
Protective Sheet
Tension Release Pins
Belt Cartridge
[Fig.3-5]
6 . Push new belt cartridge along the guide of both sides into the printer. 7 . Set the lock lever BC. 8 . Close the paper exit cover. 9 . Close the front cover.
[Fig.3-6]
Lock Lever BC Guide
3.3.2 Installation of toner cartridge to the printer: (Fig.3-7~3-9)
Caution
Refrain from holding a toner cartridge vertically, otherwise, it may adversely affect the print quality. 1. 2. 3. 4. Open the front cover unit. Holding a toner cartridge horizontally, shake it to left and right for three to four times. Remove a protective cover of toner cartridge. Push the new toner cartridge along the guide into the printer. Installation order of toner cartridge in terms of color shall be Cyan (C), Magenta (M), Yellow (Y), and Black (K). 5 . Close the front cover unit.
Toner Cartridge
Front Cover
[Fig.3-7]
Protect Cover
[Fig.3-8]
Toner Cartridge
[Fig.3-9]
K Y M C
3-6
3.3.3 Installation of Cleaning Roller and Oil Bottle:(Fig.3-10 ~ 3-13)
Procedures of Installation
Paper Exit Cover
1 . Open the paper exit unit.
Fusing Unit
[Fig.3-10]
2 . Open the retainer lock lever of oil bottle and the cleaning roller. 3 . Install the oil bottle to the fusing unit.
Fusing Oil Bottle
[Fig.3-11]
4 . Install the cleaning roller to the fusing unit. 5 . Hold the cleaning roller with the retainer lock lever. 6 . Close the paper exit cover.
[Fig.3-12]
Cleaning Roller
Lock Lever
Lock Lever
3-7
3.3.4 Test Run & Test Print
(1). Power-On & Off
( i ). Power-On: There is mark on the power supply switch located on the side panel of the printer. represents the power supply switch with push-on/push-off function.
1
Prior to connecting a power cable, confirm that the push button top of power supply switch located at the lower left front of printer projects from the cover surface. This means that the printer is in the power-off status.
Power Supply Switch
2
Connect a connector of power supply cable to the printer.
3
Insert a plug of the power supply cable to the inlet.
4
Pressing the scroll keys (left & right) and Free Size key, push the push button top of power supply switch. Next, press the ONLINE key. Then, the display of operator panel turns to be the status of (a), and "MESSAGE" LED lamp starts to blink. This blinking means that the printer is in the warming-up process.
(a). Indication at Warming-UP
01 U:LT WAIT L:[ ] /UPP [
MESSAGE
ONLINE
MEDIA
FREE SIZE
CLEAR
SELECT
5
"MESSAGE" LED lamp changes to be lit within 210 seconds at max., when screen (b) appears on the operator panel display.
(a). Indication at Warming-UP
00 U:LT READY /UPP
3-8
(ii). Power-Off:
1
Push the push button top of power supply switch in order to shut off the power supply to the printer. (This switch is push-on/push-off type. )
Power Supply Switch
2
Unplug the power supply cord from the inlet.
(iii). Precaution while power-on & off operation:
PRECAUTION
Prior to unplugging the power supply cord, confirm that the main switch located on the side panel of printer is set to the Push-Off. Strictly refrain from powering off or unplugging while the printer is performing the printing operation. When resetting the power-on, make sure to wait at least 5 seconds after powering off.
3-9
(2). Test Print
After power-on, confirm the normal printing by test printing according to the following procedures: ( i ). Procedure of Test Print
Step
Operation
Details of Operation
1
Power-On
Upon completion of the warming-up process, printer is ready to print and waits for PRINT signal. [See the power-on in Section 4.1-(1).]
Printer has the following built-in print patterns for test printing. 1). Grid Pattern : Available in mono color print of Y, M, C, K, and two color print of R, G, B.
GRID
2
Test Print See Item (ii) "Test Print Procedures" for details. 2). Stripe Pattern: Available in color print of Y, M, C, K, R, G, B.
STRIPE
3-10
(ii) Test Print Procedures Implement the test print according to the following procedures upon completion of the warming-up process. Procedure 1 Warming-up process is
completed.
Indication of Operator Panel
00 a) U:[
READY ] L: [ ]
[ [
] ]
2 Press ONLINE key so that
display changes from screen (a) to (b).
b)
SERVICE MODE TEST PRINT / NEXT
3 Press SELECT key so that
display changes from screen (b) to (c).
c)
31 TEST PRINT GRID / STRIPE
4 Select GRID or STRIPE 5 6 7 8
pattern with scroll key. ( GRID to be selected.) Press SELECT key so that display changes from screen (c) to (d). Select the color to be printed with scroll key. ( R to be selected.) Press SELECT key so that display changes from screen (d) to (e). Warming-up starts, and continuous print will be automatically carried out upon completion of the warming-up. Printing operation will be suspended by pressing CLEAR key, and display changes from screen (e) to (f). Printer will be returned to ONLINE mode by pressing ONLINE key, and display changes from screen (f) to (g).
d)
31 GRID PRINT Y/M/C/K/R/G/B
e)
31 GRID PRINT (R) U:[ ] L: [ ] [ ]
Continuous Print
9
31 GRID PRINT f) Y/M/C/K/R/G/B
10
01 g) U:[
WAIT ] L: [ ]
[ [
] ]
3-11
(iii). Selection of Media Pressing the media select key on the operator panel, select the suitable process for the media to be used. When the media select key is pressed, the media lamp changes as follows:
Condition of Media Lamp Lit Out Blinking Lit
Selected Media Ordinary Paper Stock Paper, Label OHP Sheet
(iv). Operator Call When "Operator Call" is indicated on the operator panel, see "Operator Call" column in Sub-section 8.1- (1), and take necessary actions accordingly.
3-12
(3). On-Line Print
Upon confirmation of normal printing by the test print mode, proceed with the On-Line Print according to the following procedures. However, since this Operator Manual does not refer to the connection method of Interface, or the operating method of Host side, make sure to read the operation procedure of the Host prior to starting the On-Line Print. ( i ). Procedure of Operation
Step
Operation
Details of Operation
1
Connect the interface cable to the host machine.
2
Push the push button top of power supply. Confirm that the printer is set to Confirm what is indicated on the operator panel. the On-Line mode. (Display as per right-hand figure.)
00 READY ] L:[ ] [ /UPP ]
3
4
Upon completion of warming-up process, "MESSAGE" LED lamp is lit. This warming-up process is 210 seconds at maximum.
U:[
MESSAGE
ONLINE
MEDIA
5
Printer start the printing operation upon receipt of the PRINT signal transmitted from the Host.
3-13
4. Structure of Each Component Systems
4.1 Basic Structure..........................................................................4-1 4.1.1 Print System and Transfer System ................................4-6 4.1.2 Optical System...............................................................4-24 4.1.3 Paper Transportation System ........................................4-26 4.1.4 Fusing Unit ....................................................................4-28 4.2 Structure of Control System.....................................................4-30 4.2.1 Basic Structure ..............................................................4-30 4.2.2 Operation of Control System ........................................4-40 4.2.3 DC Power Supply Unit...................................................4-50 4.2.4 High Voltage Power Supply Unit....................................4-53 4.2.5 General Wiring Diagram ................................................4-55
4. Structure of Each Component Systems
4.1 Basic Structure
(1). Mechanical & Electrical Structures This laser beam color printer (hereinafter called "Printer") consists of the five engineering systems such as Print, Transfer, Optical, Paper Transport, and Control System. Printer runs a color printing through the interactive operations of above five systems as shown in Fig. 4-1. 1 . Print System Print system consisting of the following 6 (six) functional parts located around OPC Belt forms a toner image on the OPC Belt. ·Charger Part ·Exposure Part ·Development Part ·First Transfer Part ·Discharger Part ·Cleaner Part 2 . Optical System Optical system consisting of the following 2 (two) functional parts forms electrostatic latent images on the OPC Belt by scanning a laser beam. ·Optical Unit ·Scanner Motor(SCM) 3 . Transfer System Transfer system consisting of the following 3 (three) functional parts transfers to the transported paper the toner image formed on the transfer drum. ·Transfer Drum ·Second Transfer Part ·Drum Cleaner Part 4 . Paper Transport System Paper transport system consisting of the following 5 (five) functional parts picks up a paper from the paper cassette, separates the transported paper from the transfer drum, and exits it from the printer body after fusing the toner image on the transported paper. ·Paper Cassette ·Transport Part ·Paper Discharger Part ·Fuser Part ·Paper Exit Part
4-1
Main Motor MM Developer Motor Paper Exit Unit Paper Exit Drum Cleaner Unit DM Toner Cartridge Drum Cleaning Operation OPC Belt K Y M C First Transfer Second Transfer Discharge Resistration Roller Transport Roller Erase Lamp Cleaning Paper Feed Paper Cassette Charge DC Charger Exposure Optical Unit LD Laser Diode SCM Scaner Moter MCTL I/F Control Sequence Control Laser Control I/F Controller
Fuser Unit
Fix
Development Transfer Unit AC Discharger Unit Transfer Roller
4-2
Paper Discharger
Transfer Drum
Fig4-1
5 . Control System Control system consisting of the following 4 (four) control parts runs the printer by processing the interface signals transmitted from the Host and each systems such as the print, transfer, optical, transport system. ·Sequence Control ·Laser Control ·Fusing Temperature Control ·Interface Control (2). Basic Mechanism of Color Printing 1 . Principle of Color Printing Color printing is made through the subtractive process by combining the three primary colors, yellow, magenta, and cyan. Fig.4-2 shows the three primary colors and subtractive process:
C GR BK M R Y
Y: Yellow M: Magenta C: Cyan R: Red G: Green B: Blue K: Black
BL
Fig.4-2
2 . Basic Process of Color Printing (a). Printer has the Toner Cartridge of each colors, yellow, magenta, cyan and black as shown in Fig.4-3. (b). Toner image developed with the primary colors is transferred to the transfer drum for the color combination as shown in Fig.4-4-a. (c). Toner image formed on the transfer drum is transferred to a transported paper as shown in Fig.4-4-b. (d). Toner on the paper is fused by the thermal fuser unit to fix the toner image on the paper as shown in Fig.4-4-c. Summarizing the above processes, a toner color layer is formed on the transported paper, and subsequently, the color image is made through the subtractive process.
4-3
OPC Belt Toner Cartridge Transfer Drum K Y M C
Fig4-3
Toner
a . First Transfer
MMM CC C Y Y CC Y Y Y Y Transfer Drum
b . Second Transfer
b
Y Y Y Y Y Y MMM C C C CC Paper
Red
Cyan C
Green G
C . Fusing
C
R
Paper Fig4-4
4-4
(3). Structure of OPC Belt OPC belt consists of the surface layer having a photoconductor (OPC) of organic material, the inner layer of an insulator material (PET), and the aluminum deposit layer in between. OPC belt is located as shown in Fig.4-5 as a main part of the print system.
Belt Cartridge
Toner Cartridge
OPC Belt
K Transfer Drum Y M C
Optical Unit
Fig4-5
Electrode Photoconductor(OPC) Aluminum Deposit Layer Insulator Material
Fig4-6
4-5
4.1.1 Print System and Transfer System
Fig.4-7 shows the basic structures of the print system having OPC belt as a main part, and the transfer system having the transfer drum. Color print is made by actuating the each processes in the print system and transfer system.
1 @ @ Chargimg @
2 @ @ Exposing @
Print System
KCMY
6 @ OPC Belt Cleaning
3 @ @ @ eveloping D
KCMY
5 @ @ @ elt Discharge B
KCMY OPC Belt 4 Transfer Drum(First Transfer) Transfer Drum K C M Y
Transfer System
7 @ Second Transfer(Paper)
9 @ Transfer Drum Cleaning
8 @ @ Paper Dischanging
10 @ @ @using F
Transport System
11 @ @ @ aper Exit P
Fig.4-7: Basic Structure of Print System
4-6
(
) Structure of Printer
No. 1 2 3 4 5 6 7 8 9 10 11 12
Name of Component Part Charger Optical Unit Toner Cartridge Belt Cartridge Transfer Drum Belt Discharger Erase Lamp Cleaning Blade Transfer Roller Paper Discharger Drum Cleaner Fuser Unit Paper Exit Unit
Process Charging Exposing Developing Receiving of Image Transferring of Image Discharging of Belt Cleaning of Belt Transferring Discharging of Paper Cleaning of Drum Fusing Exiting of Paper
10 11 Fusing Unit
Drum Cleaner
4 Belt Cartridge
3 12 Paper Exit Unit
Toner Cartridge (K,Y,M,C)
K Y M C 9 Paper Discharger 8 Transfer Roller 5 Transfer Drum Paper Cassette 2 Optical Unit
Transfer Unit
Paper Pick Up Roller 6 Erase Lamp 7 Cleaning Blade 1 Charger
4-7
( ) Basic Structure of Printing System Toner image is formed through the potential of OPC belt varying in each process of the charger, exposure, development, transfer and cleaning. 1 . Process of Print System (See Fig.4-8-a) (i ). OPC belt is biased to the voltage -CBV(V) by the power supply CBV. (ii). Negative high voltage is applied to the charger unit by the power supply CHV, and corona is generated as the result. (iii). Developer Roller of the toner cartridge is biased to -DBV(V) by the power supply DBV. (iv). Frame potential of the transfer drum is GND. 2 . Variation of OPC Belt's Potential (See Fig.4-8-b) (i ). OPC belt is biased to -CBV(V). (ii). OPC belt's surface is evenly charged to V0(V) in the process of charging. (iii). Potential of the exposure part is discharged till -VR(V) as exposed to the laser beam in the process of exposing, and an electrostatic latent image is formed on the OPC belt as the result. (iv). Negatively charged toner is moved to OPC belt in the development process due to difference of potential between -VR(V) and -DBV(V), and the visible image is formed as the result. (v). Negatively charged toner on the OPC belt is moved to the transfer drum in the transfer process because the potential GND of transfer drum is greater than -VR(V) of OPC belt. (vi). OPC belt is discharged by the erase lamp radiating the OPC belt.
4-8
Cleaning UNIT FCBV Fuser Unit Toner OPC Belt
Toner Cartridge
K Develop Paper Discharger
Transfer Drum
Y
M ACHV Transfer Roller THV (+) THV ( - ) Cleaning Paper Erase Lamp
Brade
DBV C CBV Optical Unit Charger CHV ZDV Po
Fig.4-8-a: Basic Structure of Print System
4-9
Process
1
2
3
4
Transfer Drum GND
5
OV - CBV - V R Toner Toner DBV - V O Dev. roller 1 F Charging Process 2 F Exposing Process Charger 3 F Developing Process 4 F Transfering Process 5 F Cleaning (Erase) CBV CHV DBV CBV CHV DBV F Power Supply for OPC Belt Bias F Power Supply for Charging F Power Supply for Dev. Roller Bias
OPC Belt
| VR F Remain voltage on the OPC Belt
Fig.4-8-b
4-10
( ) Details of Each Process 1 Charging Charging Process means that OPC belt is evenly charged by the charger. (1). Structure of Charger Unit (Fig.4-7 and Fig.4-9) 1 . Charger unit is located as shown in Fig.4-7. 2 . Charger unit consists of the case, corona wire and grid. 3 . Charger unit charges the OPC belt surface to the potential -V0(V) with the corona charge. 4 . Charger unit has the grid controllable to the constant voltage ZD(V) for even charging. (2). Process of Charging (Fig.4-10) 1 . Status of OPC belt surface before charging is -CBV(V). 2 . Charger unit charges evenly the OPC belt surface till -V0(V) by generating negative charge.
Grid
Corona Wire
-V0 ZD Case CBV CHV Cleaning (Blade) Fig.4-9 Fig.4-10
Charging
4-11
2 Exposing Exposing Process means that OPC belt surface is exposed to the laser beam to form an electrostatic latent image. (1). Structure of Optical Unit 1 . Optical unit is located as shown in Fig.4-7. 2 . Luminous source of laser beam is a semiconductor laser. 3 . Scanning is made to laser light on OPC belt as converting the laser light to the beam light through lens and reflective mirror to form an electrostatic latent image. (2). Process of Exposing (Fig.4-11) 1 . OPC belt surface has been charged to the potential -V0(V) in the process of charging 2 . Laser light is scanned as rectangular to the forwarding direction of OPC belt. 3 . High speed switching of laser is made according to the transmitted image data. 4 . Charge of the areas radiated by the laser light is discharged, where the potential is -VR(V). 5 . An electrostatic latent image is formed (invisible) on the OPC belt as shown Fig.4-11.
-V R -V O
Charging
Exposing
4-12
3 Developing Developing Process means that an electrostatic latent image on OPC belt is made visible with toner. (1). Structure of Toner Cartridge (Fig.4-7) 1 . Toner cartridge is located as shown in Fig.4-7. 2 . Four toner cartridges are made available from the top to bottom in the order of specified color as black, yellow, magenta and cyan. 3 . Each color toner is loaded in the corresponding toner cartridge. (2). Process of Developing (Fig.4-7 and Fig.4-12,-13,-14) 1 . Toner adheres to the Dev.roller of toner cartridge. Developing is processed by this Dev.roller contacting the OPC belt surface. 2 . Dev.roller has been biased to the potential -DBV(V). Fig.4-13 describes the relationship established between the potential of toner, the potential -V0(V) at the non-exposed area of OPC belt and the potential -VR(V) at the exposed area of OPC belt. 3 . Developing is processed by the toner adhering to the OPC belt due to the attraction between the potential of toner and the potential -VR(V) at the exposed area of OPC belt. (Toner image is formed (visible) on the OPC belt.) 4 . On the other hand, no development takes place at the non-exposed area because the potential of toner and that of OPC belt is identical pole and therefore repels each other.
4-13
OPC Belt Dev.roller
Toner Cartridge
Toner
Toner
Toner
Fig.4-12 Dev.roller
(-CBV)+(-DBV)
Toner (-CBV)
OP C B elt
DBV
CBV Fig.4-13
Toner(M)
Y
Exposing
M
C
K
Developing
Fig.4-14 4-14
4
First Transfer (Drum) First Transfer Process means that toner images on the OPC belt is transferred onto the transfer drum. (1). Structure of Drum Transfer (Fig.4-7) 1 . First transfer part is located as shown in Fig.4-7. 2 . Material of the drum is aluminum. 3 . Semiconductor rubber is provided to the drum surface as shown in Fig.4-16. 4 . Transfer drum rotates as contacting and synchronizing with the OPC belt.
Transfer Drum
Aluminum
Rubber
Fig.4-16
4-15
(2). Process of First Transfer (Fig.4-17) 1 . OPC belt that has been through the development process rotates as contacting and synchronizing with the transfer drum. 2 . OPC belt has been biased to the potential of -CBV(V). Potential of the transfer drum is nearly GND. 3 . Toner on the OPC belt is moved onto the transfer drum due to the difference of potential between the OPC belt and transfer drum. 4 . Toner that has been developed by each color is moved from the OPC belt onto the transfer drum, and two color toner image is overlapped on the transfer drum. 5 . Upon completion of the drum transfer process, the toner image is transferred onto a paper in the process of paper transfer.
OPC Belt
Residual Charge Residual Toner
DrumTransfering
Belt Discharging (Erase Lamp)
Belt Cleaning (Brade)
Fig.4-17
4-16
5 Belt Discharging (Erase Lamp) Belt Discharging Process means that upon completion of the drum transfer process, LED light is radiated on the OPC belt prior to cleaning the belt to discharge the residual charge for electrical cleaning. (1). Structure of Erase Lamp 1 . Erase lamp is located as shown in Fig.4-7. 2 . Luminous source of erase lamp is the 24 pieces of light emitting diodes (LED). (2). Process of Discharging (Fig.4-18) 1 . Though a toner image is transferred to the transfer drum in the drum transfer process, there is still a residual charge on the OPC belt. 2 . Residual charge -VR(V) on the OPC belt is discharged by the radiation of erase lamp's light prior to cleaning the belt.
Drum Transfering
Belt Discharging (Erase Lamp)
Belt Cleaning (Brade)
Fig.4-18
4-17
6 Belt Cleaning Belt Cleaning Process means that the residual toner adhering to the OPC belt surface is mechanically scavenged. (1). Structure of Belt Cleaning 1 . Blade for the belt cleaning is located to the belt cartridge as shown in Fig.4-7. (2). Process of Belt Cleaning (Fig.4-19) 1 . There is a residual toner on the OPC belt as it has not been transferred in the process of drum transfer. 2 . Residual toner is mechanically scavenged by the blade edge. 3 . Scavenged residual toner is collected to the waste toner pack by the waste toner feeder.
Drum Transfering
Belt Cleaning (Brade) Belt Discharging (Erase Lamp)
Fig.4-19
4-18
7 Second Transfer (Paper) Second Transfer Process means that the toner image on the transfer drum is transferred onto the transported paper. (1). Structure of Belt Cleaning 1 . Transfer roller for the second transfer is located as shown in Fig.4-7. 2 . Transfer roller is normally separated from the transfer drum. 3 . Transfer roller is positively biased by the power supply THV. 4 . Transfer roller contacts to the transfer drum in the second transfer process. 5 . Transported paper passes between the transfer roller and transfer drum. (2). Process of Belt Cleaning (Fig.4-20) 1 . Paper is transported as synchronizing with the transfer drum. 2 . Transfer roller operates as synchronizing with the transported paper, and contacts with the transfer drum through the transported paper. 3 . Transported paper passes between the transfer roller and transfer drum. In this instance, the positive high voltage (THV) is injected to the transfer roller. 4 . Negatively charged toner is moved to the positively charged paper. 5 . Transported paper with the toner transferred is transported to the paper discharging process.
4-19
Paper Discharger
Transfer Roller
Transfer Drum
Toner Image VAC THV Paper Fig.4-20 VAC: Power Supply for Paper dischargeing THV: Power Supply for Transfer Roller Bias.
4-20
8 Paper Discharging Paper Discharging Process means that the transported paper on which the transfer has been completed is separated from the transfer drum by applying AC charge to the paper. (1). Structure of Paper Discharge (Fig.4-21) 1 . AC charger unit for discharge of paper is located as shown in Fig.4-7. 2 . AC charger unit consists of the case and charger wire. 3 . High alternate voltage (VAC) is injected to AC charger unit. (2). Process of Paper Discharge (Fig.4-21) 1 . Paper has been adhered to the transfer drum in the transfer process. 2 . Paper is neutralized (discharged) in terms of the electrical charge by injecting to the paper the alternate voltage generated by the discharger. 3 . Paper is separated from the transfer drum and subsequently transported to the fusing (fixing) process.
Paper Dischrger
Transfer Roller
Transfer Drum
Toner VAC THV Paper Fig.4-21
4-21
9 Drum Cleaning
Drum Cleaning Process means that the residual toner on the transfer drum is removed. (1). Structure of Drum Cleaning(Fig.4-22) 1 . Drum cleaning unit is located as shown in Fig.4-7. 2 . Drum cleaning brush is a semiconductor type fur brush to clean the surface of transfer drum as rotating. However, the cleaning brush stays away from the transfer drum while imaging on the transfer drum. 3 . Drum cleaning roller is positively biased by the positive voltage FCBV(V). 4 . FCBV(V) is injected to the cleaning brush as well, and the cleaning brush is self-biased by the resistance of brush. 5 . Drum cleaning roller rotates as contacting to the drum cleaning brush.
(2). Process of Belt Cleaning (Fig.4-22) 1 . There is the residual toner on the surface of transfer drum after the paper transfer process. 2 . Drum cleaning brush is positively self-biased. Drum cleaning brush has the negatively charged residual toner fall off from the surface of transfer drum, and electrically absorbs the residual toner into the drum cleaning brush. 3 . Drum cleaning roller has been biased to the positive FCBV(V), the residual toner absorbed into the drum cleaning brush is attracted by the positive FCBV(V) is adhered to the surface of drum cleaning roller. 4 . Waste toner adhering to the surface of drum cleaning roller is scavenged by the cleaning blade and collected to the waste toner pack by the waste toner feeder.
4-22
Cleaning Brush
Cleaning Roller
Waste Toner Feeder Residual Toner FCBV Drum Claening Unit Transfer Drum
FCBV: Cleaning Roller
Power Supply for cleaning Roller Bias
Fig.4-22
4-23
4.1.2 Optical System
This printer employs a semiconductor laser diode as a light source. This laser diode is controlled by the fast switching according to transmitted image data (video signal). The generated laser light scans over the OPC belt through a polygon mirror and lens, by which electrostatic latent images will be formed on the OPC belt. (1). Structure of Optical System (Fig.4-23) Optical unit is located as shown in Fig.4-23. Optical unit consists of following parts. 1 . Laser Unit : Light emitting source incorporating a laser diode. 2 . Cylinder Lens : Condenser of laser beam. 3 . Polygon Mirror : Hexhedral mirror scanning the laser beam. 4 . F- Lens : Focus lens for laser beam. 5 . Scanner Motor : Motor to rotate the polygon mirror. 6 . Mirror : Reflecting mirror for the laser beam path. 7 . LDC : Laser diode control circuit. 8 . PD : Photo detector. 9 . BTD Mirror : Beam timing detector mirror to guide the laser beam to PD.
9 2 6
4 8
7 5 1 2'
Fig.4-23 4-24
3
(2) Specification : Specification of Optical Unit is described as follows:
Item Rated Output of Laser Diode Wave Length of Laser Beam Scanning Density Scanning Width Rotations Per Minutes of Scanner Motor Number of Polygon Mirror Faces
Specification for SL1 5 mW. Approx.785 nm. 600 dpi. 220 mm. 23,936 rpm. 6.
4-25
4.1.3 Paper Transportation System (1). Outline This printer employs the automatic paper feeding with the paper cassette. When toner images are formed on the transfer drum through the operations of print system and transfer system, a paper is fed by the pick-up roller and transported to the registration roller. The transported paper is further transported to the transfer, fuser and exit part by the registration roller synchronizing with the rotation of the transfer drum. (2). Structure of of Paper Transportation System (Fig.4-23) Paper Transportation System consists of following parts. 1 . Paper Cassette 2 . Pick-Up Roller 3 . Registration Roller : Case to accommodate papers to be automatically fed. : Roller to feed paper one by one, preventing multi-feed. : Roller to transport papers as synchronizing with the transfer drum. 4 . Transfer Part : Print processing part consisting of transfer drum and transfer roller to transfer a toner image on to papers. 5 . Paper Discharger Unit : Corona generator to generate AC corona for separating papers from the transfer drum. : Mechanical part to fuse the toner image with the heat 6 . Fuser Unit roller and fix it on the paper. 7 . Paper Exit Unit : Mechanical part to exit the fused paper from the printer. 8 . Paper Exit Roller : Roller to exit papers from of the printer.
4-26
7
8
6
5 4 3 2
1 Fig.4-24
1 . Paper Cassete @ 2 . Pick-Up Roller @ @ 3 . Resistration Roller 4 . Transfer Part @ @
5 . Paper Discharger Unit @ 6 .@ Fuser Unit 7 . Paper Exit Unit 8 . Paper Exit Roller
4-27
4.1.4 Fusing Unit (Fig.4-25)
Fusing Unit employs the thermal fusing system containing the heater in the roller. Papers carrying the toner images pass between the heat rollers. Heat and pressure is applied to the paper when passing between the heat rollers so that the toner image is melted and fused on the paper. (1). Structure Fusing Unit consists of the following component members: 1 . Fusing Roller 2 . Back-up Roller 3 . Fusing Heater 4 . Thermistor 5 . Thermal Fuse 6 . Oil Bottle 7 . Cleaning Roller : : : : : : : incorporates the heater. is a pressure roller to incorporates the heater. is heated by the halogen lamp. is a sensor to detect temperature of fuser roller's surface. prevent the fuser roller from being excessively heated up. contains the silicone oil for fusing. cleans the fuser roller.
7
4
6
5 1 2 3
Fig.4-25
4-28
(2). Process of Fusing (Fig.4-26) 1 . Silicone oil supplied from the oil bottle is applied to the surface of fuser roller and back-up roller. 2 . Toner image is transferred on the paper, but not yet fused on the paper. 3 . Tansported paper passes between the heater roller and back-up roller. 4 . Each roller is heated up to approx.140 C, and received approx.156N from the opposite heat roller. 5 . When the paper carrying the toner images passes between the tow heat rollers, the toner images are melted and fused on the transported papre. 6 . The paper carrying the fused image is separated from the heat rollers, and ejected from the printer.
Toner Image
M
(a). Before Fusing
C M Y
Paper
Y
Fixed Toner
(b). After Fusing
R
M
G
Fig.4-26
4-29
4.2 Structure of Control System
4.2.1 Basic Structure
(1). Electrical System and Function Most of main electrical parts of this printer is controlled by MCTL P.W.B. Structure of Sequence Control
Basic structure of the sequence control is exhibited in Fig.4-27. 1 . Print Process Control : To control the print process from the paper feed through paper exit. : To control automatically the laser output to the default.
2 . Laser Output Control
3 . Fuser Temperature Control: To control the fuser heater so that temperature of fuser roller and back-up roller will be the default. 4 . Toner Sensing Control : To control the sensing procedures of toner empty status. : To process the input and output signal with the external controller (host). : To display the printer operation status in the operator panel indicator. : To control the safe stop procedures when errors occur in the printer.
5 . Interface Control (Video Signal) 6 . Operator Panel Indicator
7 . Error Control
4-30
Operator Panel Host Computer
Cooling Fan
DM
Scanner Motor
Belt Sensor
Drum Sensor
ATC (4 pcs.) LDU
Y M C K
PD
I/F I/F Control
Sequential Control Thermal Control Toner Concentration Control Operator Panel Control Error Clearance Program CPU Laser Control
4-31
Controller
Cleaning Roller Sensor High Voltage Unit Oil Sensor Fusing Unit DC Power Supply Unit Interlock Switch
Paper Sensor Paper Feed Sensor Paper Empty Sensor Paper Size Sensor Paper Exit Sensor OHP Sensor Drum Jam Sensor Main Motor
Fig.4-27
Layouts & Functions of Electrical Parts 1 . Print P.W.B. (Fig.4-28)
No.
Name
Function
To control the series of processes of the Printer: Fuser Temperature Control, Laser Output Control, Operator Panel Indication, Toner Empty Sensing Control, Error Processing Control, Interface Control. To display the Printer's operation status and support the manual input switch.
1
MCTL P.W.B.
2
Panel Indicator P.W.B.
3
LDU P.W.B.
To control the drive and output of the laser diode to be included in the optical unit.
4
PDU P.W.B.
To sense the emission of laser diode and also the beam position to be included in the Optical unit.
5
Erase Lamp
To discharge the OPC belt by radiating the LED beam onto the OPC belt to be included in the Optical unit.
6
IOD1 P.W.B.
To relay the signals between the controlled parts and MCTL P.W.B., and to drive the controlled parts.
7
IOD2 P.W.B.
- Ditto -
8
DC Power Supply (LVPS) P.W.B.
To provide the Printer with the power supply for the printer control.
9
High Voltage Power Supply (HVU) P.W.B.
To provide the Printer with the high voltage power supply that is necessary for the printing process.
4-32
5 2
Panel
Erase Lamp
7
I OD2
6 9
High Voltage Power Supply (HVU) P.W.B.
I OD1
1
MC TL
8
DC Power Supply (LVPS) P.W.B.
3
LD U
4
PDU
Fig.-28 4
4-33
2 . Motor (Fig.4-29)
No.
Name
Code
Function
To drive the OPC belt and the paper transport system.
1
Main Motor
MM
2
Developing Motor
DM
To drive the toner cartridge and the developing system.
3
Scanner Motor
SCM
To scan the laser beam.
4
Ozone Fan Motor
OZFAN
To exhaust the ozone from printer (charger unit).
5
Heater Fan Motor
HTFAN
To exhaust the heat of fusing unit.
6
Controller Fan Motor
CTLFAN
To exhaust the heat of power supply unit and Interface Controller.
4-34
2 . Layout of Motors
Ozone Fan Heater Fan Main Motor Exit Cover Door SW.
Developing Motor Controller Fan Front Cover Door SW.
Back Cover Door SW. Scanner Motor
Fig.4-29
4-35
3 . Clutch and Solenoid (Fig.4-30)
No.
Name
Code
Function
To feed papers by coupling the feeding roller to the main gear unit at timing of the paper feeding. To transport papers by coupling the registration roller to main gear unit as synchronized with the rotation of transfer drum. To drive the fusing roller by coupling the fuser unit to the main gear unit. To drive the brush of drum cleaner by coupling the cleaner clutch to the main gear unit at timing of the drum cleaning. To drive the Mg. roller of desired color toner cartridge by coupimg said toner cartridge to the developer gear unit at timing of the developing. To relocate the desired color toner cartridge to developing position at timing of the developing. To have the transfer roller contact to the transfer roller's surface at timing of the second transfer. To have the drum cleaner contact to the transfer roller's surface at timing of the drum cleaning.
1
Feeder Clutch
PCLU
2
Registration Clutch
RECL
3
Fuser Clutch
FUCL
4
Cleaner Clutch
FBCL
5~8 Developer Clutch
DVCL (Y,M,C,K)
9
Developer Solenoid Unit
PSL(MC) PSL(KY)
10
Transfer Retract Solenoid
TRSOL
11
Cleaner Retract Solenoid
FBSOL
4-36
Layout of Clutches and Solenoids
11
3 4 10 2
1
8 6 9 5 7
Fig.4-30
4-37
4 . Sensors
No. 1
Name Paper Size Sensor
Code PSU
Function
Photo sensor to detect the paper size. Photo sensor to detect the paper is fed from the paper cassette. Photo sensor to detect that paper is exited from the paper exit unit. Photo sensor to detect if paper is loaded or empty in the paper cassette. Photo sensor to detect if the fuser unit oil is empty or not. Photo sensor to detect that material in the paper cassette is OHP. Photo sensor to detect that paper is winding around the transfer drum. Photo sensor to detect irregular rotation of the transfer drum. Photo sensor to detect the connecting position of the OPC belt. Photo sensor to detect if the toner is empty or not for each toner cartridge. Photo sensor to detect that the waste toner bottle is full of waste toner. Photo sensor to detect the early position of toner cartridges. Photo sensor to detect if the cleaning roller is available or not in the fuser unit. Thermistor to detect the fuser temperature.
2
Paper Feeder Sensor
PT1
3
Paper Exit Sensor Paper Sensor
PT2 PEU
4 5
Oil Sensor OHP Sensor Drum Paper Jam Sensor Drum Encoder
OIL
6 7
OHP DPJ
8 9
EN
Photo Belt Sensor
PBS
10
Toner Detecting Sensor
TPD/TTR
11
Waste Toner Sensor Developing Photo Sensor Cleaning Roller Sensor Temperature Sensor for Fuser unit
WTS GHP1, GHP2 CRS
12
13 14
TH
4-38
Layout of Sensors
14. Temperature Sensor for Fuser Unit 13. Cleaning Roller Sensor
3. Paper Exit Sensor 7. Drum Paper Jam Sensor
5.Oil Sensor 10. Toner Detecting Sensor 9.Phot Belt Sensor
8. Drum Encoder 12. Developing Photo Sensor 6. OHP Sensor 11. Waste Toner Sensor 2. Paper Feeder Sensor
4. Paper Sensor
1. Paper Size Sensor
Fig.4-31
4-39
4.2.2 Control System
(1). Control of Print Process Micro CPU mounted on the MCTL P.W.B. controls the print processes. [Print Sequence Diagram]
Operator Panel Host Computer
Cooling Fan
DM
Scanner Motor
Belt Sensor
Drum Sensor
ATC (4 pcs.) LDU
Y M C K
PD
I/F I/F Controller Control
Sequential Control Thermal Control Toner Concentration Control Operator Panel Control Error Clearance Program CPU Laser Control
Cleaning Roller Sensor High Voltage Unit Oil Sensor Fusing Unit DC Power Supply Unit Interlock Switch
Paper Sensor Paper Feed Sensor Paper Empty Sensor Paper Size Sensor Paper Exit Sensor OHP Sensor Drum Jam Sensor Main Motor
Fig.4-32
4-40
1 . Control Block Diagram(Fig.4-32)
No. (a)
Name of Control Sequence Control
Description To control the print sequence of printer. To control the temperature of fuser unit. To control the toner empty status of each toner cartridges. To control the operator panel indication and the operation signals. To sense the errors occurring in the printer and the stop procedures. To control the receipt and transmission of the interface signals from the external controller. To control the laser scanning and laser power.
(b)
Temperature Control
(c)
Toner Empty Sensing Control
(d)
Operator Panel Control
(e)
Error Processing Control
(f)
Interface Control
(g)
Laser Control
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(2). Laser Drive Control Circuit Laser Drive Control Circuit (LDC) consists of the video signal input circuit, laser drive circuit, laser diode, output sensing circuit and output control circuit, as shown in Fig.4-33.
Operation
1 . When the video signal is inputted, the laser drive control circuit has the laser diode switched on and radiated according to the video signal. 2 . Radiated laser beam is sensed by the photo detector (PD), and the detecting signal is fed back to the output control circuit. 3 . Output control circuit controls the radiation output to be constant, by comparing the laser output default with the feed-back value transmitted from the output sensing circuit. 4 . Laser beam scanned by the scanner motor is sensed by the beam detector (PD), and then, the beam detecting timing (BDT) signal will be outputted.
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MCTL P.W.B.
PRINT Signal Frequency Control Circuit
OPC Belt
F- Lens
4-43
PD Scaner Motor Laser Beam Scanning Control Circuit Synchronizie Control Circuit BDT LCD P.W.B. VIDEO Signal Fig.04-33
(3) Control of Fusing Temperature Each rollers of the fusing unit are controlled to maintain the appropriate temperature so that toner will be fixed on a print paper. 1 . Basic Structure of Temperature Control(Fig.4-34) FLS TFU1/TFU2 TH RY GA/CPU CM1 CM2 CM3 Q HR BR : Thyristor to control the on/off operation of power supply to the heat lamp. : Temperature fuse to shut down the circuit for safety when it will be too hot within the fusing unit. : Temperature sensor to detect the surface temperature of the heat roller(HR). : Relay to prevent the further heating when it will be hotter than the set point within the fusing unit. : Process circuit to process the temperature signal(micro computer). : Sensor circuit for temperature signal (for ACOFF signal). : Sensor circuit for temperature signal (for HON signal). : Sensor circuit for temperature signal (for processing). : Sensor circuit for shut-down by the thermistor (for THERR signal). : Heat lamp for the heat roller. : Heat lamp for the back-up roller.
2 . Characteristics of Signal HON-N ACOFF THERR AD : To : To : To : To turn on/off the heater in side the fusing roller. turn off the relay RY1 when it is sensed too hot. detect the shut-down by the thermistor. convert the temperature sensing signal to AD.
3 . Controlled Temperature and Safety
TPS
TA Temperature ( C) 150 C TS
Time 4-44
RY-1 ACOFF-P CM3 AD PC HON-N FLS RY-1
CM1
4-45
Fusing Unit
CM2
TFU1 TFU2
Q THERR ACOFF HON
BR
HR
GA/CPU
Fig 4-34: Basic Structure of Fuser Control
: To maintain the set point (temperature) for fusing of toner to be approx.150 C as appropriate by turning on/off the thyristor. TA : Reference temperature ( approx.175 C ) to identify that it is excessively hot inside the fusing unit. When it reaches to this point, the relay RY turns off, the power supply to the heat lamp is shut down, and the printer stops the operation. TPS : Limit temperature to have the temperature fuse start melting and shutting down the power supply to the heat lamp if the temperature control circuit should break down. When the temperature fuse is molten, the printer will stop the operation. 4 . Safety Control by Temperature Control Signal H0 H2 : When THERR signal is inputted, the operator panel indicates "H0", and the printer will stop the operation. : If the temperature of fusing unit will not reach to the required point "T1" after the elapse of certain time, the operator panel indicates "H2", and the printer will stop the operation. : If the "Heater On" signal is still continued after the elapse of certain time, the operator panel indicates "H3", and the printer will stop the operation. : If the temperature within the fusing unit becomes unusually hot and when ACOFF signal is inputted, the operator panel indicates "H4", and the printer will stop the operation.
TS
H3 H4
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(5). Interface Control 1 . General (a). Interface Type Video Interface handles image data and corresponds to print dots, but does not accumulate images with the buffer. Video signals of the inputted image data switches the semiconductor laser diode to form a print image. (b). Interface Connection
Operator Panel
Hitachi Color Laser Printer SL1
Laser Printer Controller Host System (LPC)
Fig.4-36: Interface Circuit (Internal Connecting System) Interface connector of the laser printer SL1 is connected to the host system as shown in Fig.4-36.
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(c). Interface Circuit (Printer side) Table4.1 Interface Circuit
No.
Interface Circuit
Name of Signal VIDEO-N
1
150
VIDEO-P
M5M34050
HSYNC-N 2 HSYNC-P
M5M34050 +5V 22 220
PRREQ-N COMMAND-N ID1-N ID2-N
3
0.01 F
GND
330
GND
SN74LS14 +5V
3.3K
VSYNC-N IREADY-N STATUS-N KEY-STATUS-N
4
SN7406
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(d). Connector Pin Assignment: Connector type of the Printer side is 128A-064S2B-:13A(DDK) or the equivalent.
Table 4.2: Connector Pin Assignment Pin No. 1A 2A 3A 4A 5A 6A 7A 8A 9A 10A 11A 12A 13A 14A 15A 16A 17A 18A 19A 20A 21A 22A 23A 24A 25A 26A 27A 28A 29A 30A 31A 32A Signal Name PSGND PSGND PSGND PSGND PSGND PSGND PSGND PSGND VIDEO-P RET(GND) HSYNC-P ID2-N RET(GND) RET(GND) RET(GND) RET(GND) RET(GND) RET(GND) RET(GND) RET(GND) ID1-N RET(GND) Reserve Reserve RET(GND) RET(GND) RET(GND) RET(GND) RET(GND) RET(GND) RET(GND) RET(GND) Pin No. 1B 2B 3B 4B 5B 6B 7B 8B 9B 10B 11B 12B 13B 14B 15B 16B 17B 18B 19B 20B 21B 22B 23B 24B 25B 26B 27B 28B 29B 30B 31B 32B Signal Name +5V +5V +5V +5V +5V +5V +5V +5V VIDEO-N Reserve HSYNC-N Reserve VSYNC-N Reserve STATUS IREADY-N Reserve COMMAND PRREQ-N Reserve Reserve KEY_STATUS-N Reserve Reserve Reserve Reserve Reserve Reserve Reserve Reserve Reserve Reserve
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4.2.3 DC Power Supply Unit
1 . Output and Use
Output Terminal +5V-1 +5V-1R +5V-2 +24V-1 HP HN
Rated Output
Use For control of Printer.
4.8~5.3V, 7.5A (8.5A)
For control of Laser. For control of Interface.
+24V, 4.5A 120V, 8A 220V, 5A
For control of Printer charging. For connection of Fuser Heater (HP). For connection of Fuser Heater (HN).
2 . Layout of Connector Pin Assignment(Fig.4-37)
4-50
ACN1 1 HP
ACN3
1 ACN2
4-51
Inret
L Black White
HN 1
Main SW
PC Pin Black
N White
Fig.4-37
2 . Connector Pin Assignment ACN1 Manufacturer: MoLex Type: 53313-2215
Pin#. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 Signal Name +5V-1 SGND +5V-1 SGND Interface +5V-1 Output Signal Ground (+5V type ground) +5V-1 Output Signal Ground (+5V type ground)
ACN2 Manufacturer: MoLex Type: 5277-02A
Pin#. 1 2 Signal Name DSW-O DSW-I Interface +24V Output through Door Switch. +24V Output through Door Switch.
AC Zero-Cross Signal ACSYNC-N (Open Collector Output) SGND +24V SGND +5V-1R Signal Ground (+5V type ground) +24V Output not through Door Switch Signal Ground (+5V type ground) +5V through the relay when +24V-1 is shut down.
ACN3 Manufacturer: MoLex Type: 5566-04A
Pin#. 1 2 3 4 Signal Name +5V-2 +5V-2 SGND SGND Interface +5V-2 Output +5V-2 Output Signal Ground (+5V type ground) Signal Ground (+5V type ground)
AC Forced Shut-Down ACOFF-P Signal(Pull-Up required). HON-N Test I2 +24V-1 Test O2 +24V-1 Test I1 +24V-1 Test O1 PGND PGND PGND