3-58 Phaser 7750 Printer Service Manual
Finisher Eject Clamp Home Sensor On Failure,
Code 120
Finisher Eject Clamp Home Sensor Off Failure,
Code 121
Error Code 120: The Eject Clamp Home Sensor did not turn ON within 5 seconds
after the Eject Clamp Up was started.
Error Code 121: The Eject Clamp Home Sensor did not turn OFF within 2 seconds
after the Eject Clamp Down was started.
Troubleshooting References
Applicable Parts Wiring and Plug/Jack Map References
■ Eject Motor
■ Finisher Control Board
Step Actions and Questions Yes No
1
1. Remove the Set Clamp Home Sensor
Bracket from the Finisher while leaving
the connector plugged in.
2. Check the Set Clamp home sensor in
diagnostics.
3. Does the value change from H to L
while blocking and unblocking the
sensor?
Go to step 2. Use the
transmissive
Sensor procedure
to diagnose and
repair the sensor.
2
1. Reinstall the sensor in the Finisher.
And turn the printer on.
2. Is the eject clamp up?
Replace the
finisher control
board.
Go to step 3.
3
1. Run the Eject Release Test in
diagnostics.
2. Does the Eject Motor Run?
Diagnose and
repair the
mechanical
problem with the
eject clamp
assembly.
Go to step 4.
4
1. Is +24 VDC present at P846-12? Replace the
eject motor.
Go to step 5.
5
1. Is +24 VDC present at test point 9 on
the finisher control board?
Replace the
finisher control
board.
Troubleshoot and
repair the
+24 VDC interlock
circuit.
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