Lexmark C760 Service Manual

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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...

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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...

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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...

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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...

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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...

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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...

Repair information4-1
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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”)...

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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...

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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...

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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,...