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Alignment & Adjustments
7
7. Alignment and Adjustments
This chapter describes some of the main service procedures including: Using the EDC mode; Clearing paper jam and test patterns. Much of this chapter is also included in the user's guide.
7.1. Paper path and Paper jam
7.1.1 Paper path
Exit Sensor
EXIT Ass'y EXIT Unit
Duplex Path
Fuser Unit
ITB
DEV. - Black DEV. - Yellow DEV. - Magenta DEV. - Cyan
Pick-up Roller
DUPLEX
Transfer Roller Feed Sensor
OPC
Feeder
MPF Path MPT Path
T F P M
FCT
SCF
CASSETTE
FCT Path
Paper Empty Sensor(MPT)
SCT
SCF Path SCT Path
Paper Empty Sensor(SCT) Paper Empty Sensor(FCT) Paper Pick-Up Roller
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7.1.2 Jams
1) Jam0 (Jam in feed area)
* After a page was picked up, it was not fed. * Paper does not reach the feed sensor in a certain time. * Feed sensor is faulty and does not detect paper. - FCF pickup error: When a paper is not picked up in the 1st cassette. - SCF pickup error: When a paper is not picked up in the 2nd cassette.
Pick-up Roller
Feed Sensor
Paper Empty Sensor
2) Jam1 (Jam inside printer)
* After the leading edge of the paper has reached the feed sensor, the feed sensor doesn't turn off (fails to detect the trailing edge of the paper) in a certain time * After the leading edge of the paper has passed the feed sensor, it doesn't reach the exit sensor in a certain time. * Exit senor is faulty and does not detect paper.
Exit Sensor
Feed Sensor
3) Jam2 (Jam in exit area)
* After the leading edge of the paper has passed, the trailing edge of the paper has not passed the exit sensor within a certain time * The paper drive motor has been driving for longer than the time needed for the longest paper size and the exit sensor is not off.
Exit Sensor
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4) Jam duplex (Jam in duplex area)
* Jam duplex occurs when printing the reverse side of the paper during duplex printing. After printing the front side the duplex solenoid must operate in order to feed the paper back into the duplex path. If the solenoid fails paper may be stuck in the exit roller and is not fully ejected into the exit tray. * If the duplex solenoid operates paper is fed back into the machine. If the leading edge of the paper does not reach the feed sensor in a certain time then Jam Duplex occurs. - This can be cause by paper being jammed in the duplex path area.
Exit Sensor
Feed Sensor
5) Jam MPF
* Paper could not be picked up from the MPF tray. * After pickup, a paper has been fed, but it doesn't reach the feed sensor in a certain time. * Feed sensor is faulty and does not detect paper.
Feed Sensor
CASSETTE
SCF
SCF Path
MP Empty Sensor
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7.2 Jam Removal
When a jam occurs while printing a jam message is displayed on the control panel. * Jam0 In Tray 1: Paper jam in the main cassette. * Jam0 In MP Tray: Paper jam in the MP tray * Jam0 Tray2: Paper jam in the SCT (Second cassette tray) * Jam Inside Printer: Jam 1, Paper is jammed inside the printer. * Jam In Exit Area: Jam2, Paper is jammed in the exit area when ejecting paper. * Jam In Duplex Path: While duplex printing, paper is jammed in the duplex unit.
CAUTION: When removing jammed paper, always pull it firmly and evenly without any sudden jerks. If at all possible, remove the paper as a single sheet. If the paper tears ensures ALL paper fragments are removed. Any fragments left inside the machine will cause it to jam again.
7.2.1 Factors that cause paper to jam
- Too much paper is loaded in the cassette. - Paper in not loaded correctly in the cassette. - Duplex cover opened while printing. - Cassette removed while printing. - Incorrect thickness of paper used. - Incorrect size of paper used. - Cassette paper guides not correctly set (loose or too tight). - Foreign object or other contamination of internal paper path and paper guide ribs. - Badly damaged or folded leading or trailing edges of the paper.
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7.2.2 Tips for Avoiding Paper Jams
By selecting the correct paper types, most paper jams can be avoided. If a paper jam occurs, follow the steps outlined below: · Ensure that the adjustable guides are positioned correctly. · Do not overload the tray. Ensure that the paper is below the paper capacity mark on the right inside the tray.
7.2.3 Jam 0 In Tray 1
If paper is jammed in the paper feed area,'Jam0 In Tray1 ' appears on the display. 1. Using the handle open the right cover. 4. Pull the tray open. After you pull it all the way out lift up the front part of the tray slightly to release the tray from the machine.
2. Carefully remove the misfed paper in the direction as shown. 5. Remove the jammed paper by gently pulling it straight out.
3. Close the right cover .The printer resumes printing. If there is any resistance, and the paper does not move immediately when you pull, stop pulling and go to step 4. 6. To replace the tray lower the rear edge, align it to the slot and slide it into the printer. 7. Close the right cover .The printer resumes printing.
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7.2.4 Jam 0 in MP Tray 1
'Jam0 In MP Tray' appears on the display when you are printing using the Multi-purpose Tray and the printer detects either there is no paper or the paper is improperly loaded. 1. If the paper is not feeding properly pull the paper out of the machine.. 2. To resume printing, open and close the right cover.
7.2.5 Jam Inside Printer : Jam1
`If paper is jammed inside the printer 'Jam Inside Printer' appears on the display. 1. Using the handle open the right cover. 2. Remove the jammed paper in the direction shown. To avoid the paper tearing pull it out gently and slowly.
NOTE : If the paper tears make sure that all of the paper fragments are removed from the printer. 3.Close the right cover. The printer resumes printing.
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7.2.6 Jam In Exit Area : Jam2
If paper is jammed in the paper exit area 'Jam In Exit Area ' appears on the display. 1. If a long portion of the paper is visible pull it straight out. If not continue to step 2. 4. Carefully take the jammed paper out of the printer.
Fuser
2. Using the handle open the left cover completely.
CAUTION : Do not touch the fuser it is hot and could cause burns! The fuser's operating temperature is 180 °C (356 °F). Take care when removing paper from the machine. 5. Close the top cover and the left cover firmly
CAUTION : If the left cover is not completely open the top cover release button will not press. 3. Press the top cover release button to unlatch the top cover and open it all the way.
CAUTION : Do not try to close the top cover with the left cover closed. This may cause damage to the machine. 6. Open and close the right cover to resume printing.
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7.2.7 Jam In Duplex Path : Jam Duplex
If paper is jammed in the duplex area 'Jam In Duplex Path' appears on the display. 1. Using the handle open the right cover. 3. If you cannot find the jammed paper or there is any resistance removing the paper go to step 4. 4. Using the handle open the left cover completely.
2. Locate the jammed paper and then pull it out gently and slowly to avoid the paper tearing. Close the right cover. The printer resumes printing.
CAUTION : If the left cover is not completely open the top cover release button will not press.
5. Press the top cover release button to unlatch the top cover and open it all the way.
or
Note : If the paper tears make sure that all of the paper fragments are removed from the printer.
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6. Locate the jammed paper and then carefully take it out of the printer.
7. Close the top cover and the left cover firmly
Fuser
CAUTION : Do not try to close the top cover with the left cover closed. This may cause damage to the machine. CAUTION : Do not touch the fuser it is hot and could cause burns! The fuser's operating temperature is 180 °C (356 °F). Take care when removing paper from the machine.
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7.2.8 Jam In the Optional Second Tray
1. Using the handle open the right cover. 4. If you cannot find the jammed paper in the machine open the Tray2 outer jam cover.
2. Remove the jammed paper in the direction shown. To avoid the paper tearing pull it out gently and slowly.
5. Open the inner cover of Tray 2.
3. Close the right cover. The printer resumes printing.
6. Pull the jammed paper out in the direction shown. To avoid the paper tearing pull it out gently and slowly. If there is any resistance, and paper does not move immediately when you pull, stop pulling and continue to step 8.
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7. Close the two jam covers. Go to step 11.
9. If you see the jammed paper remove the paper from the machine by gently pulling it straight out.
8.Pull the optional tray, Tray 2, out of the printer.
10. Slide the tray back into the printer and close the two jam covers. 11. Open and close the right cover. The printer resumes printing.
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7.3 Sample Pattern
This product provides several printable test patterns for maintenance purposes. These patterns can be used to aid the diagnosis of print quality problems.
7.3.1 Printing a Demo Page
Print a demo page to make sure that the printer is operating correctly. 1. Press the Menu button 2. Press the Enter button 3. Press the scroll button 4. Press the Enter button . on the control panel until you see "Information " on the bottom line of the display.. to access the Menu. until you see "Demo Page " on the bottom line.
A demo page showing the printer 's features and capabilities prints out.
7.3.2 Printing a Configuration Page
Print a demo page to make sure that the printer is operating correctly. 1. Press the Menu button 2. Press the Enter button 3. Press the scroll button 4. Press the Enter button . on the control panel until you see "Information " on the bottom line of the display.. to access the Menu. until you see "Configuration " on the bottom line.
A demo page showing the printer 's features and capabilities prints out.
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7.4 Checking the Remaining Toner and Others
7.4.1 Checking the Remaining Toner
You can check the level of toner left in each cartridge. 1. In ready mode press the Menu button of the display. 2 Press the Enter button 3 Press the scroll button 4 Press the Enter button 5 When `Check Toner ' displays on the bottom line,,press the Enter button 6 Press the scroll button 7 Press the Enter button . to access the menu. until `Maintenance ' displays on the bottom line. on the control panel several times until you see `Setup 'on the bottom line
until the color of the toner cartridge you want to check displays on the bottom line. The display shows the percentage of the remaining toner.
8. Press the Upper Level button to return to step 6 and select a different cartridge. 9. To return to the Ready condition press the Upper Level button several times until 'Ready' appears in the display
7.4.2 Checking the Remaining Others
You can check the level of each item. 1. In ready mode press the Menu button of the display. 2 Press the Enter button 3 Press the scroll button 4 Press the Enter button 5 When `Check Others ' displays on the bottom line,,press the Enter button 6 Press the scroll button 7 Press the Enter button 8. Press the scroll button to display either 'Image Count' or 'Reset' 9a. Choose 'Reset' and press enter to reset the counter after replacing a consumable item or 9b Choose Image count to display the counter. 10. Press the Upper Level button to return to step 7 and select a different choice or press it a second time to return to step 6 and choose a different item. 11. To return to the Ready condition press the Upper Level button several times until 'Ready' appears in the display. . to access the menu. until `Maintenance ' displays on the bottom line. on the control panel everal times until you see `Setup 'on the bottom line
until the item you want to check displays on the bottom line.
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7.4 Understanding the Control Panel
The control panel on the top right side of your printer has a display and seven buttons.
7.4.1 Display
Buttorns
Status Map
Display : dispaly the printer status and job in progress.
Message Ready
Description ·The printer is on-line and ready to print. ·If you press On Line/Continue ,the printer switches to off-line.
Offline
·The printer is off-line and cannot print. ·If you press On Line/Continue ,the printer switches to on-line.
Processing...
·The printer is printing. ·If you want to cancel printing,press Cancel .
Sleeping...
·The printer is in Power Save mode, using less power.When a print job is received from the computer or if any button is pressed,the printer switches to on-line. ·To deactivate the Power Save mode or change the power-saving time.
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7.4.2 Buttons
Message Description When an error occurs,a lamp turns on at the corresponding location on the Status map.An error message appears on the display so that you can locate the error. Status map ·Press to switch between on-line and off-line. ·In menu mode,press to return to ready mode. The color of the On Line/Continue button indicates the status of the printer. On The printer is on-line and can receive data from the computer. · When the backlight blinks slowly,the printer is receiving data from Green Blanking the computer. · When the backlight blinks quickly,the printer is receiving and printing data. The printer stops printing due to a major error.Check the display On Orange message. A minor error has occured and the printer is waiting for the error to be cleared.Check the display message.When the problem is Blanking cleared,the printer resumes printing.If you want to ignore this warning,press this button. Off ·The printer is off-line and cannot print. ·The printer is in Power Save mode. When data is received,it switches to on-line. · Press to enter menu mode. · In menu mode,press to scroll through the menus.
In menu mode,press to select the displayed submenu item or confirm the changed setting.The selected item is marked with an *.
In menu mode,press to scroll through submenu items or setting options.Pressing · moves you to the next option and pressing · sends you back to the previous option.
· Press to cancel the current print job. · In menu mode,press to return to ready mode.
In menu mode,press to go back to the upper menu level.
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7.4.3 Using Control Panel Menus
A number of menus are available to make it easy for you to change the printer settings.
You can configure your printer from the printer's control panel.You can also use the control panel menus while the printer is in use. 1. In ready mode press the Menu button 2. Press the Enter button 3. Press the scroll button 4. Press the Enter button until you see the menu you want on the bottom line of the display.
to access the menu. until the menu item you want displays on the bottom line. to confirm the selected item.
5. If the menu item has submenus, repeat steps 3 and 4. 6. Press the scroll button 7. Press the Enter button until the setting option you want displays on the bottom line or enter the required value. to save your input or selection.
- An asterisk (*) appears next to the selection on the display, indicating that it is now the default. 8. To exit the menu, press the Upper Level button repeatedly, or the Cancel button .
- After 60 seconds of inactivity (no key has been pressed), the printer automatically returns to ready mode.
NOTE: Print settings made from the printer driver override the settings on the control panel.
Information Configuration Menu Map Demo Page
Layout Duplex Duplex Margin
Printer Default Set Current Job
Setup LCD Language Power Save Auto Continue Jam Recovery Altitude Adj. Maintenance
Color Calibration Custom Color
NETWORK* Config Network Config TCP IP Get Method IP Address Subnet Mask Gateway Config 802.11b Netware Config Netware IPX Frame Type Reset Network Default Set Print Net CFG
* This menu only appears when a Network Card is fitted (CLP500N or CLP500 with optional Network card).
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7.5 Periodic Defective Image
If an image defects appears at regular intervals on the printed-paper, it is due to a faulty or damaged roller. Refer to the table below and check the condition of the appropriate roller. No
1 2 3 4 5 6 7
Roller
OPC Drum Charge Roller Supply Roller Developing Roller ITB(T1) Transfer Roller(T2) Heat Roller
Defective image
same position in each page 43.96 mm 26.02 mm 29.28 mm same position in each page 75.36 mm 109.9 mm
Typical defect
white spot on black image or black spot black spot light or dark horizontal image band horizontal image band black spot ghost Black spot and ghost, printing backside pollution
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7.6 How to use EDC (Engine Diagnostic Control) Mode
7.6.1 EDC Establishment
EDC Mode is feature that allows the engineer to check the condition of the print engine. It can check the operating condition of the motors, sensors, solenoids and clutches, measure the High Voltage from the HVPS and check the operation of the fuser and LSU.
7.6.1.1 How to enter the EDC Mode
a) Turn on the printer while pressing the "Enter" key. Hold the key until 'Select Test mode' appears in the display. b) Press the direction key until "" is displayed. c) Press the "Enter" key. d) appears in the display. Press the ěCancelî key twice.
Note. There are a number of other test modes. Only EDC Test and Panel Tests should be used by service engineers, all
other functions are for factory use only.
7.6.1.2 Functions of the keys on the Panel and how to use them.
Key
On Line Cancel Menu Left/Right Arrow Enter Upper Menu Menu Find Menu Run/Select Stop/Move
Function
Description
Not used Not used Display Top Menu of EDC Mode Move Menu Rrun the Function / Select Menu Stop the selected Function or go to Upper Menu.
7.6.1.3 LCD Function and Directions
Upper Line : Upper Line messages mainly show the current test menu or sub-menu. [Main Menu] or [Function] is displayed. Lower Line : Lower Line messages mainly the current test and status.
Buttorns
Status Map
Display : dispaly the printer status and job in progress.
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7.6.2 EDC Whole Menu
Motor Test Main Motor Dev Motor Waste Motor SCF Motor Fan Motor
Solenoid Test Y Clutch M Clutch C Clutch K Clutch Y Solenoid M Solenoid C Solenoid K Solenoid Feed Clutch T2 Solenoid FCF Solenoid MPF Solenoid SCF Solenoid ITB Solenoid Duplex Solenoid
Sensor Test Feed Sensor Exit Sensor FCF Empty Sensor MPF Empty Sensor SCF Empty Sensor SCF Cover Sensor Waste Box Sensor Cover Check
LSU & Fuser Test LSU Motor Laser Diode Fuser
HVPS Test Charger T1 T2 Dev DC Dev AC
Test Print Select Tray Select Pattern Print Pattern Print Menu Map
Interface Test SCF Interface
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7.6.2.1 Motor Test
This function allows the operation of the various motors to be checked.
a) Press the "<" or ">" key until "Motor Test" is displayed. b) Press the "Enter" key to select this function. c) Press the "<" or ">" key until you see the name of the motor you wish to test. d) Press the "Enter" key to run the test. The test is stopped by pressing the "Upper Level" key. e) Pressing the "Upper Level" key when the test is already stopped will return to step 'c' above. f) Pressing the "Upper Level" key again will return to the EDC main menu. Item
Main Motor Dev Motor Waste Motor SCF Motor Fan Motor
Description
Operates Main Motor Operates Dev Motor Operates Waste Motor Operates SCF Motor Operates Fan Motor
Remarks
Displays "Succeed" if Motor Lock Signal is Normal, "Failed" otherwise. Displays "Succeed" if Motor Lock Signal is Normal, "Failed" otherwise. Display motor status - "On" or "Off". Display motor status - "On" or "Off". Display motor status - "On" or "Off".
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7.6.2.2 Solenoid Test
This function allows the operation of various solenoids and clutches to be checked.
a) Press the "<" or ">" key until "Solenoid Test" is displayed. b) Press the "Enter" key to select this function. c) Press the "<" or ">" key until you see the name of the clutch or solenoid you wish to test. d) Press the "Enter" key to run the test. The test is stopped by pressing the "Upper Level" key. e) Pressing the "Upper Level" key when the test is already stopped will return to step 'c' above. f) Pressing the "Upper Level" key again will return to the EDC main menu. Item
Y Clutch M Clutch C Clutch K Clutch Y Solenoid M Solenoid C Solenoid K Solenoid Feed Clutch T2 Solenoid FCF Solenoid MPF Solenoid SCF Solenoid ITB Solenoid Duplex Solenoid
Description
Operates Yellow Developer Clutch Operates Magenta Developer Clutch Operates Developer Clutch Operates Black Developer Clutch Operates Yellow Developer Solenoid Operates Magenta Developer Solenoid Operates Cyan Developer Solenoid Operates Black Developer Solenoid Operates Feed Clutch Operates T2 Clutch Operates FCF pick-up Operates MPF pick-up Operates SCF pick-up (Only if SCF is fitted) Operates ITB cleaning clutch OperateS Duplex Solenoid
Remarks
Displays clutch status - "On" or "Off". Displays clutch status - "On" or "Off". Displays clutch status - "On" or "Off". Displays clutch status - "On" or "Off". Displays solenoid status - "On" or "Off". Displays solenoid status - "On" or "Off". Displays solenoid status - "On" or "Off". Displays solenoid status - "On" or "Off". Displays clutch status - "On" or "Off". Displays solenoid status - "On" or "Off". Displays solenoid status - "On" or "Off". Displays solenoid status - "On" or "Off". Displays solenoid status - "On" or "Off". Displays solenoid status - "On" or "Off". Displays solenoid status - "On" or "Off".
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7.6.2.3 Sensor Test
This function allows the operation of various sensors to be checked
a) Press the "<" or ">" key until "Sensor Test" is displayed. b) Press the "Enter" key to select this function. c) Press the "<" or ">" key until you see the name of the sensor you wish to test. d) Press the "Enter" key to display the sensor status. If the sensor actuator is moved the displayed status will change to reflect the new sensor position.. e) Pressing the "Upper Level" key will return to step 'c' above. f) Pressing the "Upper Level" key again will return to the EDC main menu.
Item
Feed Exit FCF Empty MPF Empty SCF Empty SCF Cover Waste Box
Description
Feed Sensor Status Exit Sensor Status FCF Empty Sensor status MPF Empty Sensor Status SCF Empty Sensor Status SCF Cover Sensor Status Waste Toner Sensor Status
LCD indication
"With Paper" is displayed when Paper is detected, "Without paper" is displayed when paper is not detected. "With Paper" is displayed when Paper is detected, "Without paper" is displayed when paper is not detected. "With Paper" is displayed when Paper is detected, "Without paper" is displayed when paper is not detected. "With Paper" is displayed when Paper is detected, "Without paper" is displayed when paper is not detected. "With Paper" is displayed when Paper is detected, "Without paper" is displayed when paper is not detected. "Cover Opened" or "Cover Closed" is displayed. "Not Installed" is displayed when either the Waste toner tank is not installed or it is full. "Installed" is displayed when the Waste Toner tank is installed and is not full. "Cover Opened" or "Cover Closed" is displayed.
Cover
Left or Right Cover Sensor Status
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7.6.2.4 LSU & Fuser Test
This function allows the Fuser, LSU Motor and Laser Diode to be tested.
a) Press the "<" or ">" key until "LSU & Fuser Test" is displayed. b) Press the "Enter" key to select this function. c) Press the "<" or ">" key until you see the name of part you wish to test. d) Press the "Enter" key to run the test. The test is stopped by pressing the "Upper Level" key. e) Pressing the "Upper Level" key when the test is already stopped will return to step 'c' above. f) Pressing the "Upper Level" key again will return to the EDC main menu. Item
LSU Motor
Description
Operates LSU Motor
Remarks
The LSU motor must come into lock within 6 seconds. After 7 secs the status is displayed either: "Succeed" if lock is successful within the time limit "Failed" if lock is not achieved
LD Fuser
Operates Laser Diode Heats the Fuser Repetitive cycle (10secs) - Lamp on for 500msec then off again.
· The LSU Motor Lock Time is a maximum 15 seconds depending on the environment. It may take over 15 seconds until the or message is displayed. · For safety - after printing a test pattern if you need to return to EDC mode turn the printer off and then re-enter EDC.
7.6.2.5 Interface Test
This function tests communications between the Main PBA controller and the SCF controller.
a) Press the "<" or ">" key until "Interface Test" is displayed. b) Press the "Enter" key to select and run this function. c) "Succeed" or "Failed" is displayed.. d) Pressing the "Upper Level" key again will return to the EDC main menu.
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7.6.2.6 Test Print
This function allows you to test the overall function of the print engine. You can select either a 4 * 4 color bar pattern or a solid color pattern. If the solid pattern is selected 4 pages are printed - one for each color. You can also print the EDC Mode Menu Map.
a) Press the "<" or ">" key until "Test Print" is displayed. b) Press the "Enter" key to select this function. c) Press the "<" or ">" key until "Select Tray" is displayed. d) Press the "Enter" key to select this function. e) Press the "<" or ">" key until required tray is displayed and then press the "Enter Key" f) Press the "Upper Level" key. g) Press the "<" or ">" key until "Select Pattern" is displayed. h Press the "Enter" key to select this function. i) Press the "<" or ">" key until required pattern is displayed and then press the "Enter Key" j) Press the "Upper Level" key. k) Press the "<" or ">" key until "Print Pattern" is displayed. l) Press the "Enter" key to print the pattern. For safety - after printing a test pattern if you need to return to EDC mode turn the printer off and then re-enter EDC Mode by turning power on whilst holding in the "Enter" key.
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7.6.2.7 HVPS Test
This function allows the HVPS to be tested
a) Press the "<" or ">" key until "HVPS Test" is displayed. b) Press the "Enter" key to select this function. c) Press the "<" or ">" key until you see the name of the voltage you wish to test. d) Press the "Enter" key to select the test. e) Press the "<" or ">" key to select the appropriate Duty Cycle and press "Enter" to start the test The test is stopped by pressing the "Upper Level" key. The display shows the acceptable range for this setting (column 4 in the table below) The mid range (nominal) voltage is shown in column 3 in the table below. e) Pressing the "Upper Level" key when the test is already stopped will return to step 'c' above. f) Pressing the "Upper Level" key again will return to the EDC main menu. Item
Charger T1
Description
Supply Voltage to the Charger Supply Voltage to T1
Lower Menu & Input Voltage
Duty 50% : -1262V Duty 80% : -2037V Duty 50% : 1174V Duty 90% : 2080V Duty 30% : 1800V Duty 80% : 4540V Reverse Bias : -900V Duty 45% : -370V Duty 35% : -2200V
LCD Indication
Duty 50% : -1224V ~ -1300V Duty 80% : -1976V ~ -2098V Duty 50% : 1139V ~ 1209V Duty 90% : 2018V ~ 2142V Duty 30% : 1746V ~ 1854V Duty 80% : 4404V ~ 4676 Reverse Bias : -800V ~1200V Duty 45% : -359V ~ -381V Duty 35% : -2134V ~ -2266V
T2
Supply Voltage to T2
Dev DC Dev AC
Supply DC Voltage to Dev Supply AC Voltage to Dev
* The allowed tolerance is commonly +/- 3%, this is the value isplayed, in case of "Dev AC", it is the value of Vpp.
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