Question about Lexmark T632 Laser Printer

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I have a Lexmark T632 that is used very often. Constantly printing over 1000 pages daily and I always get the error message Print head Error 934 - Lost Lock condition but once I shut down the printer and restart it error message is gone and I can continue with my printing. I have tried changing out the print head and still get the same error eventually is this normal?

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  • Big Cee Dec 14, 2008

    I ordered the parts I needed won’t know if it fixed the problem until I get them in thank you for your help.



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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. Check the continuity of the mirror
motor cable connected to J5 on the system board. If incorrect,
replace the cable. The voltage at J5-7 measures approximately
+24 V dc. If incorrect, replace the system board. If correct, replace
the FRUs in the following order:
• System board
• Printhead assembly

Posted on Dec 10, 2008

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This error message means that the printer has determined that the length of the paper in the source specified on the second line of the display is too short to print the formatted data. For auto-size sensing trays, this error occurs if the guides are not in the correct position.

Please try to do the following


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? Make sure the Paper Size setting in the Paper Menu is correct for the size paper you are using. If MP Feeder Size is set to Universal, make sure your paper is large enough for the formatted data.

? Press Menu to open the Job Menu and cancel the current job. Please see also the media guidelines on the user manual p.29


For further assistance, please contact Lexmark Technical Support.

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Are you using the right cartridge?
Are the cartridge inserted in the correct way?
Take out the cartridges - Turn off the printer - Turn on the printer - Insert the cartridges again

You will find more help here:

http://www.lexmark.com/lexmark/sequentialem/home/0,6959,204816596_652569478_0_en,00.html

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1 Answer

Print head assembly on my Lexmark Optra S 1855 needs to be replaced. My question is what causes the print head to malfunction in the first place?


I guess you're getting an error message which is normally one of the below (causes underneath)

Error Code 931
No first HYSNC Signal
Error Code 932
Lost HYSNC =

These errors usually indicate a
failure in the HYSNC signal to the
printhead. Check the continuity of
the cables connected to J3 and J8
on the engine board. If incorrect,
replace the defective cable. The
voltage at J8-4 measures
approximately +5 V dc. If incorrect,
replace the engine board. The
voltage at J3-7 measures
approximately +24 V dc. If incorrect,
replace the engine board. If correct,
replace the printhead assembly.


Error Code 934
Mirror Motor Lost Lock
Error Code 935
Mirror Motor unable to
reach operating speed =

These error codes indicate a
problem with the mirror motor circuit
in the printhead assembly or the
mirror motor cable to the engine
board cable or engine board
assembly. Check the continuity of
the mirror motor cable connected to
J3 on the engine board. If incorrect,
replace the cable. The voltage at
J3-7 measures approximately
+24 V dc. If incorrect, replace the
engine board. If correct, replace the
FRUs in the following order:
engine board
printhead assembly

Jun 19, 2008 | Lexmark Printers & Copiers

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