Lexmark C736 Service Manual

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Symptom tables
Printer symptom table
Print quality symptom table
Symptom Action
Dead printer Go to “Dead printer service check” on page 2-126.
Operator panel—one or more buttons do 
not work.Go to “One or more operator panel buttons fail” on 
page 2-131.
Operator panel—display is blank. Printer 
sounds five beeps.Go to “Operator panel display blank, five beeps, and LED is 
off” on page 2-131.
Operator panel—display is blank.  Go to “Operator panel...

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User status and attendance messages
Error code   Action 
Close Front Door Close the front door securely. If you continuously get this error, then either the 24 V interlock 
switch or the 5 V interlock switch is bad. See “24 V interlock switch service check” on 
page 2-123 and “5 V interlock switch service check” on page 2-121.
Disk Corrupted, 
Reformat?The printer has attempted a disk recovery and cannot repair the disk. The disk must be 
formatted to use....

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Load Manual  
If paper loaded is in the manual feeder, the job continues. If paper is not in the feeder, 
pressing Select indicates to the printer it should search for a source with the proper type and 
size.
Additional messages may include:
• Show Me—the printer will present instructions.
• Cancel Job—the printer job can be cancelled.
Paper Changes Needed
PC Unit Exposure 
WarningThis warning occurs when the front door is left open too long. Close...

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3x through 8x attendance messages
31 Defective or Missing 
 Cartridge• Reseat the specified toner cartridge.
• Inspect the smart chip card contacts (A) for damage, contamination or positioning error. If 
damaged, contact your next level of service.
• Inspect the toner cartridge contacts for damage/contamination. Replace the toner 
cartridge if defective.
• Inspect the JSBTN1 cable connection. Properly connect the cable if not connected 
properly. Replace the...

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37 Insufficient memory 
to collate job• Select Continue to print the portion of the job already stored and begin collating the rest 
of the job.
• Cancel the current job.
• If this does not fix the problem, replace the system board. See “System board removal” 
on page 4-153.
37 Insufficient memory 
for Flash Memory 
Defragment operation• Select Continue to stop the defragment operation and continue printing.
• Delete fonts, macros, and other data in...

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53 Unformatted Flash  • Select Continue to clear the message and continue printing.
• Format the flash memory before storing any resources on it. If the error message 
remains, replace the flash memory.
• If this does not fix the problem, replace the system board. See “System board removal” 
on page 4-153.
54 Serial option  
error• Make sure the serial link is set up correctly and the appropriate cable is in use.
• Make sure the serial interface parameters...

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58 Too Many Flash 
OptionsToo many flash options are installed. To continue:
1. Turn off and unplug the printer.
2. Remove the excess flash memory.
3. Plug in the printer, and turn it on.
If this does not fix the problem, replace the system board. See “System board removal” on 
page 4-153.
58 Too Many Trays 
Attached1. Turn off and unplug the printer.
2. Remove options until the supported number of options for that model. Models C734 
supports three...

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80 Fuser Life Warning • Select Continue to clear the message and continue printing.
•Show Me, View Supplies, and Tell Me More displays additional information.
• Order a replacement fuser. When print quality is reduced, install the new fuser using the 
instruction sheet that comes with the replacement fuser.
Note: Be sure to reset the fuser count. See “Reset Fuser Cnt” on page 3-25.
• If this does not fix the problem, replace the system board. See “System...

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82 Replace Waste 
Toner• Replace the waste toner box using the instruction sheet that comes with the replacement 
waste toner box.
• Ensure that there is no interference between the waste toner box and the printer. 
• If the problem persists, open the front access door and check the aligner shaft for binding. 
Clear the binding if possible. 
• If the problem persists, replace the system board. See “System board removal” on 
page 4-153.
• If the...

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84  PC Unit 
Missing• Scroll down the operator panel to see if the printer is showing that all four of the PC units 
are missing. If so, check the HVPS cable between the system board and the HVPS. 
Ensure that the cable is not plugged in backwards on the HVPS. Disconnect and 
reconnect the cable to make sure there is good contact.
• Insert or reinstall the specified photoconductor unit and see if problem clears. See 
“Photoconductor unit removal” on page...