Lexmark C 746 Service Manual

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920.12—POST (power-on self test)—One toner sensor 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...

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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 4-47. 
Reseat the cables in connectors JCARTP1 
and JCARTS1.
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 connectors.
Is the...

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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 4-47. 
3. Reseat the cables in connector JCARTP2 
and JCARTS2. 
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.
Are...

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920.15, 920.20—POST (power-on self test)—Bad transfer module NVRAM data error 
service check
920.16—POST (power-on self test)—Bad printhead NVRAM data 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 4-37.
3. Check the JTPS1 connector for any 
damage, and then reseat the JTPS1 
cable.
4. Check the transport cable connection to 
the transport belt for any...

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920.17—POST (power-on self test)—Output bin cable 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 bin full sensor cable in 
connector JBIN1.
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 connector.
Is...

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920.18—POST (power-on self test)—Cartridge motor 3 not connected error service 
check
920.19—POST (power-on self test)—Transfer module stepper motor 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 4-47. 
Reseat the cables in connectors JCARTP2 
and JCARTS2.
Does the error clear?Problem resolved. Go to step 2.
2Measure the continuity across all...

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2Measure 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 3.
31. Open the right cover. 
2. Reseat the motor driver cable on the 
motor driver side (A).
3. Reseat all cables connected to the motor 
driver card.
Did this clear the error?Problem resolved.  Go to step 4.
4Note: Connect a new motor driver cable from 
outside of the...

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920.21—POST (power-on self test)—24 V power supply failure error service check
Step Questions / actions Yes No
1Note: The LVPS must be turned off for 
several seconds before turning back on. This 
error can occur if the LVPS does not have 
time to recover after being turned off.
1. Open the front door cover
2. Check the 24V interlock switch for 
damage and proper installation.
3. Check if the front door actuator can trigger 
the sensor.
Is the front door...

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920.23—POST (power-on self test)—Duplex motor 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 JDX1.
Does the error clear?Problem resolved. Go to step 2.
2Measure the continuity across all of the fuses 
on the system board.
Are any of the fuses blown?Replace the system board. 
See “System board...

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920.27, 920.28, 920.29—POST (power on self test) option tray error service check
920.32—MPF paper present sensor not connected 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...