Lexmark C760 Service Manual

							
Diagnostic aids3-31
  5060-4xx
Disk Test/Clean
Warning:   This test destroys all data on the disk and should not be attempted on a good disk. This test may run 
approximately 1½ hours depending on the disk size.
To run the Disk Test/Clean Test:
1.Select  Disk Test/Clean  from DEVICE TESTS in the Diagnostics mode.
Files will be lost/Go or Stop?  is displayed to warn the user.
2.To exit the test immediately and return to DEVICE TESTS, press  Return or Stop . To continue with the test, 
press  Go.
If  Go  is selected,  Disk Test/Clean/BAD:000000 00%  is displayed. The screen updates periodically 
indicating the percentage of test completed and the number of bad blocks found.
3.The power indicator  blinks during the test. The test can be canceled anytime during the test by pressing 
Return  or Stop . 
Once the test is complete, the power indicator turns on solid and a message displays. 
xxxx Bad Blocks/ yyyyyy Usable is displayed if fewer than 2000 bad blocks are detected. xxxx 
indicates the number of bad blocks and  yyyyyy indicates the number of usable blocks.
xxxx Bad Blocks/Replace Disk is displayed if more than 2000 bad blocks are detected. The disk 
cannot be recovered because too many bad blocks exist on the disk.
4.Press  Go, Return , or Stop  to retur n to DEVICE TESTS.
Flash Test
This test causes the file system to write and read data on the flash to test the flash.
Warning:   This test destroys all data on the flash because the flash is reformatted at the end of the test.
To run the Flash Test:
1.Select  Flash Test  from DEVICE TESTS in the Diagnostics mode.
The power indicator  blinks while the test is running.
Flash Test/Test Passed is displayed if the test passes and the power indicator turns on solid.
Flash Test/Test Failed is displayed if the test fails and the power indicator turns on solid.
2.Press  Go, Return , or Stop  to return to DEVICE TESTS. 
						

							
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PRINTER SETUP
Defaults
This setting is used by the printer to determine whether US or non-US factory defaults should be selected. The 
following printer settings have different US and non-US values:
Warning:  Modification of the printer setting Defaults causes the NVRAM space to be restored to the printer’s 
factory settings.
PAGE COUNTS
Color Page Count
Mono Page Count
Perm Page Count
Setting the page counts
The printer’s page count can be changed via the diagnostic menu. The Color and Mono Page Count can be 
changed whenever the paper size sensing board is replaced. 
Note:   The Perm Page Count cannot be changed.
1.Select PAGE COUNTS  from PRINTER SETUP in the Diagnostics mode.
2.Select either Color Page Count  or Mono Page Count .
When you have made the selection, a screen similar to the following is displayed:
3.The left most digit  blinks, indicating it is the first digit to be changed. To change the value, press either 
Menu  until the desired value is displayed. Press  Select to move to the next digit. The digit  blinks. Continue 
modifying each digit using this method. To skip a digit and keep its current value, press  Select.
4.When you have completed selecting the final digit, press  Select and the count is stored in NVRAM.
5.Press Return  to retur n to PRINTER SETUP.
6.Select a new test or select  Exit Diagnostics from the Diagnostic Menu.
Default values
Printer setting US value Non-US value
Paper size (paper feeding sources which do not have 
hardware size sensing capabilities) Letter A4
Envelope size
(Envelope feeding sources which do not have hardware size 
sensing capability) 10 Envelope DL Envelope
Fax paper size Letter A4
PCL symbol set PC-8 PC-850
PPDS code page 437 850
Universal units of measure Inches Millimeters
Color Page Count
=1234567* 
						

							
Diagnostic aids3-33
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Viewing the permanent page count
The permanent page count can only be viewed from the operator panel and cannot be changed.
1.Select  Perm Page Count  from PRINTER SETUP in the Diagnostics mode.
2.A screen similar to the following screen displays when permanent page count is selected:
3.Press Return  to retur n to PRINTER SETUP in the Diagnostics mode.
Serial Number
You can view the serial number.
Engine Setting  x
Warning:  Should not be changed without specific instructions from the next level support.
Model Name
You can view the model name.
Configuration ID
Warning:  Should not be changed without specific instructions from the next level support.
The configuration ID is used to communicate characteristics of certain areas of the printer that cannot be 
determined by hardware sensors. The configuration ID is originally set when the printer is manufactured. 
However, it needs to be reset when the system board or paper size sensing board are replaced.
1.Select  Configuration ID  from PRINTER SETUP in the Diagnostics mode.
The following screen is displayed:
2.Open the waste container door to locate a label above the waste container. The label contains the 
configuration ID.
3.The leftmost digit  blinks, indicating it is the first digit to be changed. To change the value, press  Menu until 
the desired value is displayed. Press  Select to move to the next digit. The digit  blinks. Continue modifying 
each digit using this method. To skip a digit, and keep its current value, press  Select.
4.When Select  is pressed after the final digit, the configuration ID is validated. If the ID is invalid, the invalid 
ID is displayed momentarily on the second line before the ID is displayed. If the ID is valid, then the ID is 
stored in NVRAM and the printer automatically begins POR to activate the new setting.
Note:   The printer begins POR in the normal mode, not in the diagnostic mode.
Note:   If a configuration ID has not been set, and  Check Configuration ID displays, then upon entry into 
Diagnostics mode, Configuration ID is the only diagnostic function displayed until a valid ID is entered.
Edge to Edge
Turn Edge to Edge printing on or off. Perm Page Count
=1234567*
Configuration ID
=1234567* 
						

							
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Reset Calibration
The Reset Calibration resets the TPS NVRAM values when initiated.
1.Select Reset Calibration  from PRINTER SETUP in the Diagnostics mode and the following screen 
displays:
Then the following screen is displayed:
2.The printer returns to the previous screen when calibration is complete.
Cal Ref Adj
Warning:   Should not be changed without specific instructions from the next level support.
EP SETUP
EP Defaults
Fuser Temp
DC Charge Adjustment
Dev Bias Adj
Transfer Adjust
EP Defaults
The EP Defaults is used to restore each of the printer settings contained in the EP Setup menu to their factory 
default value.
To restore the EP Setup settings to factory defaults, select  Restore.
To exit the menu without restoring the settings to the factory defaults, select  Do Not Restore.
Fuser Temp
Warning:  Should not be changed without specific instructions from the next level support.
DC Charge Adjustment
Warning:  Should not be changed without specific instructions from the next level support.
Dev Bias Adj
Warning:  Should not be changed without specific instructions from the next level support.
Transfer Adjust
Warning:  Should not be changed without specific instructions from the next level support.
PRINTER SETUP
Reset Calibration
Resetting
Calibration 
						

							
Diagnostic aids3-35
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ERROR LOG
Display Log
The error log provides a history of printer errors. The error log contains the 12 most recent errors. The most 
recent error appears in position 1 and the oldest error appears in position 12 (if 12 errors have occurred). If an 
error occurs after the log is full, the oldest error is discarded. Identical errors in consecutive positions in the log 
are entered. All 1 xx, 2xx  and 9 xx error messages are stored in the error log. These errors are also shown in 
Print Quality Pages.
To view the Error Log:
1.Select  Display Log  from ERROR LOG in the Diagnostics mode.
The Error log is displayed on three screens as only four entries display at a time.
2.Press  Menu to move forward or backward and view additional lines.
3.Press  Return  or Stop  to exit the Error Log.
Print Log
The history of printer errors can be printed. The first page of the error log contains a Printer Information section 
similar to what is printed on a Menu Setting Page. Printed at the top of each page is the model name and serial 
number to assist in tracking each page of a report to a specific printer. The printout of the log contains the 
following information for each error in the log:
Page count when the error occurred (except for 900 service RIP software errors).
Code versions of all packages when error occurred.
Panel display when error occurred (except for 900 service RIP software errors).
Debug information and secondary error codes depending on the error.
The Clear Log operation clears out the errors that print in this report. The errors listed in the Display Log 
operation do not necessarily match in number nor in order with the errors from the printer log.
Note:   This log can be printed from configuration menu, but the debug and secondary error codes are not be 
printed on this log. 
						

							
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Clear Log
To clear the Error Log:
1.Select Clear Log  from ERROR LOG in the Diagnostics mode.
2.Select Ye s to clear the Error Log or  No to exit the Clear Log menu.
If  Ye s  is selected, the Empty Error Log displays on the screen.
3.Press  Return  or Stop  to exit the Clear Log menu.
EXIT DIAGNOSTICS
Select  EXIT DIAGNOSTICS  to exit the Diagnostics mode and return to normal mode.
HCIT standalone test mode
This test lets you check out and test the HCIT (2000-Sheet High Capacity Input Tray) without removing any 
option or the base printer mounted above the optional HCIT.
Note:  During normal operation, the red LED on the HCIT system board  blinks on for one second and off for one 
second.
Dip switch settings
Do the following steps to set and run the Test/Diagnostic:
1.Use the Dip Switch Settings table to determine the settings (DSW1 thru DSW4) on the HCIT control board 
for the test you want to run.
2.Turn the HCIT power off by moving the LVPS slide switch to the left position.
3.Press and hold the Push Button Switch PBSW1 while moving the LVPS slide switch to the right position. 
The red LED on the HCIT control board comes on.
4.Press PBSW1 to feed paper.
5.Press PBSW1 to stop feeding paper.
Dip switch settings
DSW1 DSW2 DSW3 DSW4 Mode
Off Off Off N/A Set for shipping
Off Off On N/A The Mirror Reflection Sensors must be adjusted anytime the  sensors are replaced.
Off On Off N/A EEPROM Initialize
Off On On N/A Not used
On Off Off N/A Paperless Operation Mode
On Off On N/A Self Operation Mode
On On Off N/A Standalone Feeding Operation Mode
On On On N/A Not used 
						

							
Repair information4-1
  5060-4xx
4.  Repair information
Warning: Read the following before handling electronic parts.
Handling ESD-sensitive parts 
Many electronic products use parts that are known to be sensitive to electrostatic discharge (ESD). To prevent 
damage to ESD-sensitive parts, use the following instructions in addition to all the usual precautions, such as 
turning off power before removing logic boards:
Keep the ESD-sensitive part in its original shipping container (a special “ESD bag”) until you are ready to 
install the part into the machine.
Make the least-possible movements with your body to prevent an increase of static electricity from clothing 
fibers, carpets, and furniture.
Put the ESD wrist strap on your wrist. Connect the wrist band to the system ground point. This discharges 
any static electricity in your body to the machine.
Hold the ESD-sensitive part by its edge connector shroud (cover); do not touch its pins. If you are removing 
a pluggable module, use the correct tool.
Do not place the ESD-sensitive part on the machine cover or on a metal table; if you need to put down the 
ESD-sensitive part for any reason, first put it into its special bag.
Machine covers and metal tables are electrical grounds. They increase the risk of damage because they 
make a discharge path from your body through the ESD-sensitive part. (Large metal objects can be 
discharge paths without being grounded.)
Prevent ESD-sensitive parts from being accidentally touched by other personnel. Install machine covers 
when you are not working on the machine, and do not put unprotected ESD-sensitive parts on a table.
If possible, keep all ESD-sensitive parts in a grounded metal cabinet (case).
Be extra careful in working with ESD-sensitive parts when cold-weather heating is used because low 
humidity increases static electricity. 
						

							
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Screw identification table
The following table contains screw types, locations, and quantities necessary to service the printer. Pay careful 
attention to each screw type location when doing removals. You must install the correct screw type in each 
location during reassembly.
Reference 
number Screw type Location Purpose Qty
002 4-40 Machine Parallel connector to shield Attach 2
102 M3.5x8 mm Thread Cutting Cartridge guides to upper frame Attach  8
Upper front cover to cartridge guides Attach 4
Front cover pivot to front upper cover Attach 2
Front left light shield to upper front cover Attach 1
121 M3.5x6 mm  Machine LVPS to lower frame Mounting 7
Right rear cover to LVPS Attach 1
HVPS standoffs to upper frame Mounting 4
133 M3x8 mm Panhead Door handle to cover Attach 2
Detent housing to cover Attach 1
Door spring shields to cover Attach 4
214 M3.5x10 mm Machine ITU motor to gearbox Mounting 4 
						

							
Repair information4-3
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232 M3x6 mm Taptite  Metal Thread 
Forming Ground cable to right front cover support 
and upper frame.
Attach 2
Blank INA covers to system card shield Mounting 2
Rear V-block plate to upper frame Mounting 1
Transfer HVPS to card shield Attach 1
Media size card to support plate Attach 3
Black bellcrank studs Mounting 2
Ground cable to bottom support plate 
shield support assembly Attach 2
Rear cover to card shield Attach 6
Ground cable strap to system card shield 
assembly Attach 1
Card shield to card support plate Attach 2
System card to shield Mounting 8
Card shield cover to card shield Attach 4
USB connector to shield Mounting 1
312 M2.9x6 mm Plastite Front access door assembly Mounting 3 ITU switch housing to light shield Attach 1
Duplex baffle to lower right door Attach 4
Front and rear latches to lower right door Mounting 2
Bias latch cover to door Attach 1
MPF asm to MPF door Attach 6
Support bracket to MPF door Attach 4
MPF cable cover to door asm Mounting 1
MPF latch support brackets to upper frame Attach 2
Voltage cable to terminal (BOR/ITU) black Attach 1
Voltage cable to terminal (BOR/ITU) cyan Attach 1
Voltage cable to terminal (BOR/ITU) 
Magenta Attach 1
Voltage cable to terminal (BOR/ITU) yellow Attach 1
Thermistor to printheads Attach 8
Guides to V-blocks Attach  8
323 M3.5x8 mm Plastite Thread 
Forming Frame support back plate to lower frame Attach 2
Door latch catch to frame Attach 2
Transfer HVPS to lower frame Mounting 2
Fuser top duct to lower frame Attach 1
Right front cover support to lower frame Attach 1
Front lower left cover to lower frame Attach 1
Front left handle cover asm to lower frame Attach 4
Front lower right cover to lower frame Attach  1
Front right handle cover asm to lower frame Attach 4
Right front cover to lower frame Attach 2
Reference 
number
Screw type Location Purpose Qty 
						

							
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323 M3.5x8 mm Plastite Thread 
Forming
(continued) Left lower cover to lower frame Attach 2
Left upper cover asm to lower frame Attach 2
Left upper cover asm to upper frame Attach 1
Left lower pivot to lower frame Attach 2
Left upper pivot lower frame Attach 1
Rear cover to lower frame, left cover Attach 6
Rear fan cover to lower frame and top 
cover
Attach 4
RIP fan assembly to upper frame Attach 1
Cartridge contact caps to housing Attach 8
Rear cover to lower frame, left cover and 
top cover Attach 10
Top cover asm to upper front cover Attach 3
Top cover asm to card shield Attach 1
ITU light shield asm to upper front guide 
ITU Attach 1
Ribs to upper redrive door Mounting 5
Upper door hinges to upper frame (redrive) Mounting 2
Inner redrive asm to upper frame (redrive) Mounting 2
Developer HVPS to cartridge contact asm Mounting 4
BOR drive asm to upper frame Mounting 1
ITU drive asm to lower frame Mounting 3
Fuser drive asm to lower frame Mounting 4
Vacuum top duct to lower frame Mounting 2
Toner shield to lower frame Attach 4
Upper deflector to lower frame 
(PF XPORT) Mounting 2
VTB asm to lower frame (PF XPORT) Mounting 3
Inner deflector to lower frame (PF XPORT) Attach 1
Jam access spring to VTB asm 
(PF XPORT) Attach 1
500 pick assembly to lower frame Mounting 3
Paper size sensing assembly to lower 
frame Mounting 1
Paper level sensing assembly to lower 
frame Mounting 3
Duplex actuator bracket to lower frame Mounting 2
Fuser top duct to lower frame Mounting 1
Tray interlock bellcrank to lower frame Attach 1
Front left light shield to upper front cover 
and front left handle assembly Mounting 2
Card support plate to frame Mounting 2
Card shield to lower frame Mounting 3
Reference 
number
Screw type Location Purpose Qty