3-52 Phaser 7750 Printer Service Manual
Rear Tamper Home Sensor Failure, Code 115
With the Rear Tamper Home Sensor OFF the Rear Tamper Home Sensor did not turn
On within 800 ms after the move to the Rear Tamper Home position has begun.
With the Rear Tamper Home Sensor on the Rear Tamper Sensor did not turn Off
when the Rear Tamper Home Sensor is deactuated.
Troubleshooting References
Applicable Parts Wiring and Plug/Jack Map References
■ Rear Tamper Motor
■ Finisher Control Board
Troubleshooting Procedure
Step Actions and Questions Yes No
1
1. Run the Rear Tamper Low Front or
Rear Tamper Low Rear test in
diagnostics.
2. Does the rear tamper guide operate?
Go to step 6. Go to step 2.
2
Does the rear tamper motor operate? Check the
tampering
mechanism for a
mechanical
problem.
Go to step 3.
3
1. Check pins J878A pins 1,3,4 and 6.
2. Is +24 VDC present on any of the
pins?
Go to step 4. Go to step 5.
4
1. Check the following wires for and open
circuit or short circuit to ground.
2. Is any wire open or shorted?
3. J878A-1 to J848B-1
4. J878A-3 to J848B-3
5. J878A-4 to J848B-4
6. J878A-6 to J848B-6
Repair or replace
the wiring
harness.
Replace in order
until resolved:
■ rear tamper
motor
■ finisher control
board
5
Is +24 VDC present on pins J848B-2 and
J848B-5 on the finisher control board?
Replace the
finisher control
board.
Troubleshoot and
repair the
+24 VDC
interlock circuit.
6
1. Check the tamper rear home sensor in
diagnostics.
2. Does the value change from H to L
when the tamper is moved away from
the home position?
Replace the
finisher control
board.
Repair the sensor
circuit using the
transmissive
sensor
troubleshooting
procedure.
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