Belt Up/Down Sensor Error - Lexmark C920 Service Manual

5056-XXX

981 - Belt Up/Down Sensor Error

981 Service
Switch Error
Step Questions/actions
1 Is the engine code the latest level?
2 Are connectors CN409 and CN407 on the sensor
board connected properly?
3 Are connectors CN11 on the CK1 daughter board, and
CN15, CN3, CN4, and CN5 on the printer controller
board connected properly?
4 Remove the transfer belt. Verify the belt up/down
sensor actuator flag, on the bottom of the transfer belt
unit is properly installed, not broken, and in the proper
position.
Rotate the shaft attached to the belt up/down sensor
actuator flag. Are there any binds other than when
engaging the transfer belt?
Make sure the sensor is fully snapped in place, and
that the sensor connector is fully seated.
Are these items correct?
5 Clean the belt up/down sensor (located on the bottom
of the transfer belt unit).
Does this fix the problem?
6 Disconnect the belt up/down sensor on the transfer belt
unit, bypassing the density sensor and door open
sensor. Power on the printer.
Does the belt up/down shaft rotate during POST?
7 Replace the transfer belt unit.
Did this fix the problem?
2-22
Service Manual
Yes No
Go to step 2. Update the
printer with latest
code level.
If this does not
resolve the
problem,
continue with
step 2.
Go to step 3. Plug the
connectors in
securely.
Go to step 4. Properly connect
all connections.
Go to step 5. If the sensor is
out of position or
disconnected,
properly install
the sensor and
properly connect
the sensor to the
belt unit.
If the shaft
attached to the
belt up/down
sensor actuator
binds, replace
the transfer belt
unit.
If the sensor
actuator flag is
broken, replace
the transfer belt
unit.
Problem solved. Go to step 6.
Replace the Go to step 7.
transfer belt unit.
Problem solved. Replace the
printer controller
board.