Rear Tamper Home Sensor Failure, Code 115 - Xerox 7750DXF - Phaser Color Laser 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
Rear Tamper Motor
Finisher Control Board
Troubleshooting Procedure
Step Actions and Questions
1
1. Run the Rear Tamper Low Front or
Rear Tamper Low Rear test in
diagnostics.
2. Does the rear tamper guide operate?
2
Does the rear tamper motor operate?
3 1. Check pins J878A pins 1,3,4 and 6.
2. Is +24 VDC present on any of the
pins?
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
5 Is +24 VDC present on pins J848B-2 and
J848B-5 on the finisher control board?
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?
3-52
Wiring and Plug/Jack Map References
Yes
Go to step 6.
Check the
tampering
mechanism for a
mechanical
problem.
Go to step 4.
Repair or replace
the wiring
harness.
Replace the
finisher control
board.
Replace the
finisher control
board.
Phaser 7750 Printer Service Manual
No
Go to step 2.
Go to step 3.
Go to step 5.
Replace in order
until resolved:
rear tamper
motor
finisher control
board
Troubleshoot and
repair the
+24 VDC
interlock circuit.
Repair the sensor
circuit using the
transmissive
sensor
troubleshooting
procedure.