Lexmark C736 Service Manual

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2Turn the printer off, and then remove the rear 
frame cover. See “Rear frame cover 
removal” on page 4-33.
Reseat the transport cable in connector 
JTPS1 (A). 
Does the error clear?Problem resolved. Go to step 3.
3Check the transport cable in connector JTPS1 
for pinch points and for any other damage to 
the cable or connector.
Is the cable damaged?Replace the transport 
cable. See “Transport 
cable removal” on 
page 4-170. Go to step 4.
4Check the...

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920.04—POST (power-on self test) 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 cartridge motor 1/fuser cable in 
connector JCARTP1 and JCARTS1 for pinch 
points and the cables or connectors for any 
other damage.
Are the...

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4Check the continuity of JCARTP1, pins 4, 5, 
and 6 and JCARTS1, pins 7 through 12.
Is there continuity?Go to step 5. Replace the cartridge 
motor 1/fuser motor cable. 
See “Cartridge motor 1/
fuser cable removal” on 
page 4-62. 
5Replace the EP drive assembly. See 
“Electrophotographic (EP) drive assembly 
removal” on page 4-82. 
Does the error clear?Problem resolved. Replace the system board. 
See “System board 
removal” on page 4-153. Step...

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920.05—POST (power-on self test) printhead motor 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 
JMIRR1 (A).
Does the error clear?Problem resolved. Go to step 2.
2Check the cables in connector JMIRR1 for 
pinch points and any other damage to the 
cables or connectors.
Is the cable damaged?Replace the...

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920.07—POST (power-on self test) 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 cable in connector JTRAY1.
Does the error clear?Problem resolved. Go to step 2.
2Check the cable in connector JTRAY1 for 
pinch points and the cable or connector for 
any other damage. 
Is the cable damaged?Replace the paper pick 
mechanism. See...

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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   and 
. and turn on the printer).
4. Select SENSOR TESTS, and press 
Select().
5. Select Dynamic Sensors, and press 
Select().
6. Select Narrow Media, and press 
Select().
7. Activate the narrow media sensor.
Did the narrow media sensor change from 
Closed to Open?Remove the paper...

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920.09—POST (power-on self test)—Four 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 4-33. 
Reseat the cable in connector JHVPS1 (A).
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...

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920.10—POST—Three toner sensors not connected error service check
920.11—POST (power-on self test)—Two toner sensors not connected error service 
check
Step Questions / actions Yes No
1Remove the left cover. See “Left cover 
removal” on page 4-21. Check all the toner 
level sensor cables connected to the rear of 
the HVPS. 
Are any of the cables damaged?If only one or two of the 
toner level sensor are 
damaged:
• Disconnect the 
sensor(s).
• Go to step...

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2Reconnect the HVPS cable. Disconnect one 
of the toner level sensors and POR the 
printer.
Does the 920.11 error occur again?• If the error recurrs, then 
this sensor is one of the 
bad sensors.’
• Continue disconnecting 
the toner level sensors 
until two sensors are 
disconnected and the 
920.11 error occurs.
• Replace the toner level 
sensors that are 
disconnected. See 
“Toner level sensor 
removal” on 
page 4-160. Repeat this step for the...

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920.12—POST (power-on self test)—One sensor not connected error service check
Step Questions / actions Yes No
1Remove the left cover. See “Left cover 
removal” on page 4-21. Check all the toner 
level sensor cables connected to the rear of 
the HVPS. 
Are any of the cables damaged?Replace the damaged 
sensor. See “Toner level 
sensor removal” on 
page 4-160.Go to step 2.
2Disconnect the cable in the connector 
JHVPS1 from the system board and the 
HVPS....