Scan Quality Service Check - Lexmark X642e Service Manual

Printhead service check
CAUTION
The printhead is not a serviceable FRU. Do not disassemble the printhead.
The printhead assembly does not contain any service replaceable parts or components. If service error code
930.xx displays, the wrong printhead is installed in the printer. See
Note: A 201.xx paper jam may also indicate a failing printhead. The paper may have jammed prior to or at the
input sensor. Print the event log and see if 201 or 931 errors are logged.
Service error code
1 Error code 931.xx
No first HYSNC Signal
Error Code 932
Lost HYSNC
2 Error Code 934.xx
Mirror motor lost lock Error
Code 935
Mirror motor unable to
reach operating speed

Scan quality service check

Determine if the problem is in the scanner assembly or in the base printer. Enter the Diagnostic Menu and select
Print Quality Test Pages. Make sure the printer is set to specifications before using the test pages on the
scanner. Check the test pages to help determine if the problem is in the base printer or the scanner. If the
problem is in the scanner, ADF, or flatbed use the test pages to help isolate the problem in the appropriate
scanner assembly and continue with this service check. If the problem is in the base printer, see
service check" on page
Vertical streaks or lines on image
Note: Perform the
this service check.
Note: Vertical streaks can be caused by debris in the optical path of the CCD module(s). Check for any signs of
pieces of media or other debris in or around the ADF CCD, flatbed contact glass, or flatbed CCD.
FRU
1 Models X644e, X646e
2 Model X642e
Explanation
These errors usually indicate a failure in the HYSNC signal to the
printhead. Check the continuity of the cables connected to J2 and J4
on the system board. If incorrect, replace the defective cable. The
voltage at J4-1 measures approximately +5 V dc. If incorrect, replace
the system board. The voltage at J2-7 measures approximately
+24 V dc. If incorrect, replace the system board. If correct, replace
the printhead assembly. See
These error codes indicate a problem with the mirror motor circuit in
the printhead assembly or the mirror motor cable to the system board
cable or system board assembly. The voltage at J5-2 measures
approximately +24 V dc. If incorrect, replace the system board. If
correct, replace the FRUs in the following order:
• System board. See
model X642e" on page 4-130
shield removal —models X644e/X646e" on page
• Printhead assembly See
2-160.
"Cleaning the scanner glass, cushions, and strips" on page 6-2
Action
If you do not have one of these models, to step 2.
If the vertical streaks only occur with the ADF scanner assembly, go
to step 3. If the streaks are in the flatbed scanner assembly, go to
step 7.
Go to step 7.
"Printhead" on page 7-24.
"Printhead removal" on page
"System board and inner shield removal—
or "System board and inner
"Printhead removal" on page
before proceeding with
Diagnostic information
7002-xxx
4-127.
4-131.
4-127.
"Print quality
2-165