Lexmark C736 Service Manual

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3Measure the resistance across fuse F13 on 
the system board.
Is the fuse blown?Replace the system board. 
See “System board 
removal” on page 4-153.Go to step 4.
4Replace the MPF/duplex motor assembly. 
See “Multipurpose feeder (MPF)/duplex 
motor assembly removal” on page 4-118. 
Does the error clear?Problem resolved. Replace the system board. 
See “System board 
removal” on page 4-153.  Step Questions / actions Yes No
1JSB1JBIN1
JFAN1JFUSER1...

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920.27, 920.28, 920.29—POST (power on self test) service check
925.01, 925.03, 925.05—Fan error service check
Step Questions / actions Yes No
1Is the specified option the 550-sheet tray? Replace the 550-sheet tray 
with a new 550-sheet tray 
option.Go to step 2.
2Is the specified option the special media tray? Replace the special media 
tray with a new special tray 
option.Go to step 3.
3Is the specified option the high-capacity input 
tray (HCIT)?Replace...

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925.02, 925.04, 925.06—Cartridge cooling fan error service check
Step Questions / actions Yes No
1Turn the printer off, and remove the rear 
frame cover. See “Rear frame cover 
removal” on page 4-33.
Check the cable in connector JBLW1 (A) for 
proper connection to the system board, for 
pinch points, and any other damage to the 
cable or connector.
Is the cable damaged?Replace the blower. See 
“Cartridge cooling fan 
removal” on page 4-61. Go to...

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945.xx, 947.xx—Transfer roll error service check
Step Questions / actions Yes No
1Replace the transfer module. POR the printer.
Did the error clear?Problem resolved. Replace the original 
transfer module. Go to step 
2.
2Turn the printer off, and then remove the rear 
frame cover. See “Rear frame cover 
removal” on page 4-33. 
Check the cable in connector JHVPS1 (A) for 
proper connection to the system board, the 
cable for pinch points, and the cable or...

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4Remove the HVPS. See “High-voltage 
power supply (HVPS) removal” on 
page 4-108. Check for continuity between the 
contacts (yellow1 and yellow2, cyan1 and 
cyan2, magenta1 and magenta2, or black1 
and black2) on the transfer contact assembly. Go to step 4. Replace the transfer 
contact assembly.
Is continuity present?
4 Replace the HVPS. See “High-voltage 
power supply (HVPS) removal” on 
page 4-108. 
Does the error clear?Problem resolved....

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950.00–950.29—EPROM mismatch failure
Warning:When replacing any one of the following components:
•System board
•Operator assembly card or top access cover assembly
Replace only one component at a tie or the printer will be rendered inoperable. Replace the required 
component, bring the printer up in Diagnostic menu (see “Diagnostics menu” on page 3-2), and verify 
that the problem is fixed before performing a POR.
This error code indicates a mismatch...

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956.xx—System board failure service check
5 V interlock switch service check
Step Questions / actions Yes No
1Turn the printer off, and remove the rear 
frame cover. See “Rear frame cover 
removal” on page 4-33. 
Check the cable in connector J49 for proper 
connection to the system board.
Is the cable seated correctly?Replace the system board. 
See “System board 
removal” on page 4-153.Reseat the cable.
Step Questions / actions Yes No
1Is the +5 V...

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2Turn the printer off, and remove the rear 
frame cover. See “Rear frame cover 
removal” on page 4-33.
Check the cable in connector JINT1 (A) for 
proper connection to the system board, for 
pinch points, and for any other damage to the 
cable or connector.
Is the cable damaged?Replace the 5 V interlock 
switch. See “5 V interlock 
switch cable removal” on 
page 4-45.Go to step 3.
31. Disconnect the cable in connector JINT1.
2. Connect the new 5 V...

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24 V interlock switch service check
Step Questions / actions Yes No
1Is the 24 V interlock switch damaged? Replace the 24 V interlock 
switch. See “24 V 
interlock switch removal” 
on page 4-47.Go to step 2.
2Turn the printer off, and remove the rear 
frame cover. See “Rear frame cover 
removal” on page 4-33.
Check the cable in connector JCVR1 (A) for 
proper connection to the system board, for 
pinch points, and for any other damage to the 
cable...

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Bubble sensor service check
Step Questions / actions Yes No
1Is the bubble sensor flag damaged? Replace the fuser. See 
“Fuser removal” on 
page 4-104.Go to step 2.
2Remove the rear frame cover. See “Rear 
frame cover removal” on page 4-33.
Check the fuser DC cable in connector 
JFUSER1 (A) for proper connection to the 
system board, pinch points, and any other 
damage to the cable or connector.
Is the cable damaged?Replace the fuser DC 
cable. See “Fuser...