Lexmark C736 Service Manual

Diagnostic information2-105
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920.13—POST (power-on self test) cartridge motor 1 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 4-33. 
Reseat the cables in connectors 
JCARTP1 (A) and JCARTS1 (B).
Does the error clear?Problem resolved. Go to step 2.
2Check the cables in connectors JCARTP1 
and JCARTS1 for pinch points and any other 
damage to the cables or...

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920.14—POST (power-on self test)—Cartridge motor 2 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 4-33. 
3. Reseat the cables in connector JCARTP2 
(A) and JCARTS2 (B). 
Does the error clear?Problem resolved. Go to step 2.
2Check the cable in connector JCARTP2 and 
JCARTS2 for pinch points and any other 
damage to the cable or connector....

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920.15, 920.20—POST (power-on self test)—Bad transfer module NVRAM data error 
service check
4Measure the resistance across the fuse F7 
(A) on the system board.
Is the fuse blown?Replace system board. 
See “System board 
removal” on page 4-153. Replace the EP drive 
assembly. See 
“Electrophotographic 
(EP) drive assembly 
removal” on page 4-82.
Step Questions / actions Yes No
1Turn the printer off, and then remove the rear 
frame cover. See “Rear...

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920.16—POST (power-on self test)—Bad printhead NVRAM data error service check
3Lower the front access cover. Check the 
transport cable for pinch points and any other 
cable damage.
Is the cable damaged?Replace the transport 
cable. See “Transport 
cable removal” on 
page 4-170.Go to step 4.
4Replace the transfer module. See “Transfer 
module removal” on page 4-168.
Does the error clear?Problem resolved. Replace the system board. 
See “System board...

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920.17—POST (power-on self test)—Output bin cable 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 4-33. 
Reseat the bin full sensor cable in connector 
JBIN1 (A).
Does the error clear?Problem resolved. Go to step 2.
2Check the bin full sensor cable in connector 
JBIN1 for pinch points and any other damage 
to the cable or...

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920.18—POST (power-on self test)—Cartridge motor 3 not connected 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. 
Reseat the cables in connectors 
JCARTP2 (A) and JCARTS2 (B).
Does the error clear?Problem resolved. Go to step 2.
2Check the cartridge motor 2/3 cables in 
connectors JCARTP2 and JCARTS2 for 
pinch points and any other damage to the...

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920.19—POST (power-on self test)—Transfer module stepper motor not connected 
error service check
4Measure the resistance across the fuse F10 
on the system board. 
Is the fuse blown?Replace the system board. 
See “System board 
removal” on page 4-153. Replace the EP drive 
assembly. See 
“Electrophotographic 
(EP) drive assembly 
removal” on page 4-82.
Step Questions / actions Yes No
1Turn the printer off, and then remove the rear 
frame cover....

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3Measure the resistance across fuses F12 (A) 
and F13 (B)on the system board.
Is either fuse blown?Replace the system board. 
See “System board 
removal” on page 4-153. Go to step 4.
4Check the transport motor cable for pinch 
points and any other damage to the cable or 
connector. 
Is the cable damaged?Replace the transport 
motor cable. See 
“Transport cable 
removal” on page 4-170. Go to step 5.
5Visually inspect the motor driver card.
Is the motor...

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920.21—POST (power-on self test)—24 V power supply failure error service check
Step Questions / actions Yes No
1Check the input voltage switch on the back of 
the low-voltage power supply (LVPS).
Some LVPS FRU do not have switches and 
switch automatically. If your does not have a 
switch, go to step 2.
Is the voltage level (115/230) properly set?Go to step 2. Set switch for the proper 
country voltage.
2Turn the printer off, and then remove the...

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920.23—POST (power-on self test)—Duplex motor not connected error service check
4Measure the resistance across fuses F5, F6, 
F7, F9, F10, F12, and F13 on the system 
board.
Are any of the fuses blown?Replace the system board. 
See “System board 
removal” on page 4-153.Replace the low-voltage 
power supply. See “Low-
voltage power supply 
(LVPS) removal” on 
page 4-112.
Step Questions / actions Yes No
1Turn the printer off, and then remove the rear 
frame...