Advice for the Lexmark T654, T652 Error Code 931.00 Related to the Printhead
If you are not familiar with Lexmark machines but have worked on other manufactures, you might be wondering what the heck is the printhead. Well the printhead is just Lexmarks name for the laser scanner assembly. On this page you will find information on the  Lexmark T654, T652 Error Code 931.00. Following the repair tips at the bottom of the page you will find a link to the replacement instructions. If you feel the need to reseat the connectors or the whole unit then click on the link for illustrated pictures on the getting the unit out.
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Service Manual Advice for the  Lexmark T654, T652 Error Code 931.00
Lexmark T654, T652 Error Code 931.00 – No first laser H sync
The hsync signal is missing or not at the correct voltage.
Replace the printhead assembly.
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Advanced Troubleshooting Tips for the Error Code 931.00
1. Turn the machine off then back on. I have a Brother machine in our office that gets a laser scanner error once or twice a year. You turn the thing off then back on and the problem goes away. I would start getting concerned if the error happened more than once a in a month to two month period. At that point I would be looking to replace the printhead.
2. Check the connectors. Reseat as needed. Remember to unplug the machine if you are going to be taking it apart.
3. Replace the printhead.
Click on the link below for the Printhead Replacement Instructions
Lexmark T654, T652 Printhead Replacement Procedure – 40X4464
40X4464 – T652, T654 Lexmark Printhead With Cable Asm
