Lexmark C 746 Service Manual

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19Replace the modem. Restart the device. 
Does the 900.xx error reoccur?Go to step 31. Problem 
resolved.
20Run a fax job. 
Does the 900.xx error reoccur?Go to step 31. Go to step 21.
21Are there any ISP (internal solutions port) options 
installed?Go to step 22. Problem 
resolved.
22Reinstall the first ISP option. Restart the device. 
Does the 900.xx error reoccur?Go to step 24. Go to step 23.
23Run a job to test the option. 
Does the 900.xx error...

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900.05—Transfer module error service check
902.59—Engine software error, NVRAM MGR problem service check
Step Questions / actions Yes No
11. Turn the printer off.
2. Remove the rear frame cover. See “Rear 
frame cover removal” on page 4-47.
3. Check the transport cable in connector 
JTPS1 for proper connection to the 
system board. 
4. Open the front access door and check the 
transport cable for pinch points and any 
other damage to the cable or connector....

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920.03, 920.25—Transfer Module Missing or not connected service check
920.04—POST (power-on self test) fuser motor not connected error service check
Step Questions / actions Yes No
1Open the front access door. Reseat the 
transport cable.
Does the error clear?Problem resolved. Go to step 2.
2Turn the printer off, and then remove the rear 
frame cover. See “Rear frame cover 
removal” on page 4-47.
Reseat the transport cable in connector 
JTPS1. 
Does...

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920.05—POST (power-on self test) printhead motor not connected error service check
2Check the cartridge motor 1/fuser cable in 
connector JCARTP1 and JCARTS1 for pinch 
points and the cables or connectors for any 
other damage.
Are the cables damaged?Replace the cartridge 
motor1/fuser cable. See 
“Cartridge motor 1/fuser 
cable removal” on 
page 4-67. Go to step 3.
3Remove the right cover.See “Right cover 
removal” on page 4-51. Check the cartridge 
motor...

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920.06—Input sensor service check
920.07—POST (power-on self test)—Narrow media sensor error service check
3Measure the continuity across all of the fuses 
on the system board.
Are any of the fuses blown?Replace the system board. 
See “System board 
removal” on page 4-155.Go to step 4.
41. Perform the printhead verification to check 
whether the new printhead solves the 
problem. See “Printhead verification” 
on page 3-39. 
2. Navigate to PRINTHEAD...

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920.08—Exit sensor service check
3POR the printer. Place a voltmeter between 
JTRAY1(pin 4), and ground (pin 1).
Does the meter read 5 V dc?Go to step 4. Replace the system board. 
See “System board 
removal” on page 4-155.
41. Disconnect the cable in JTRAY1.
2. Connect the cable from the new paper 
pick mechanism.
3. Bring the printer up in Diagnostic menu 
(turn off the printer, press and hold 
buttons 3 and 6, then turn on the printer).
4. Navigate to...

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4Place a voltmeter between the fuser DC 
autoconnect pin 8 and ground (pin 6).
Does the meter rear +5 V dc?Go to step 6. Go to step 5.
5Place a voltmeter between the connector 
JFUSER1 pin 8 and ground (pin 6) on the 
system board.
Does the meter read +5 V dc?Go to step 6. Replace the fuser DC 
cable. See “Fuser DC 
cable removal” on 
page 4-113.
61. Replace the fuse without resetting the 
fuser count.
2. Bring the printer up in Diagnostics Menu...

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920.09—POST (power-on self test)—Four toner sensors not connected error service 
check
Step Questions / actions Yes No
11. Turn the printer off.
2. Remove the rear frame cover. See “Rear 
frame cover removal” on page 4-47. 
3. Reseat the cable in connector JHVPS1.
Does the error clear?Problem resolved. Go to step 2.
2Check the HVPS cable in connector JHVPS1 
for pinch points and any other damage to the 
cable or connector.
Is the cable damaged?Replace the...

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920.10—POST—Three toner sensors not connected error service check
Step Questions / actions Yes No
1Turn the printer off, and then remove the rear 
frame cover. See “Rear frame cover 
removal” on page 4-47. 
Reseat the cable in connector JHVPS1.
Does the error clear?Problem resolved. Go to step 2.
2Check the HVPS cable in connector JHVPS1 
for pinch points and any other damage to the 
cable or connector.
Is the cable damaged?Replace the HVPS cable....

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920.11—POST (power-on self test)—Two toner sensors not connected error service 
check
Step Questions / actions Yes No
1Turn the printer off, and then remove the rear 
frame cover. See “Rear frame cover 
removal” on page 4-47. 
Reseat the cable in connector JHVPS1.
Does the error clear?Problem resolved. Go to step 2.
2Check the HVPS cable in connector JHVPS1 
for pinch points and any other damage to the 
cable or connector.
Is the cable damaged?Replace the...