Question about Xerox Phaser 7750 Laser Printer

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Cyan ATC sensor failure. Error code 14. I replaced developer and did ATC sensor setup. Still having issue.

Posted by Anonymous on

  • xerkos
    xerkos Mar 14, 2015

    Clear Tech Rep Faults
    The following printer faults can occur during normal operation, and the normal
    procedure is to isolate and repair the problem. However, with these particular faults,
    an additional step is required. A value has been written in the engine NVRAM that
    requires clearing before the printer can be used. Some faults require three occurrences
    before the fault is generated.
    To clear a Tech Rep Fault, you must disconnect the Finisher option. The
    following functions generate a Tech Rep Fault:
    1. From the Main Menu, highlight Troubleshooting and press OK.
    2. Highlight Service Tools and press OK.
    3. Press the Up and Down Arrow buttons simultaneously to enter the Hidden
    Service menu.
    4. Highlight Run Service Diagnostics and press OK to enter Service Diagnostics.
    5. Highlight NVRAM Access and press OK.
    6. Highlight Clear Tech Rep Faults and press OK.
    7. Highlight the Link Code(s) to be reset and press OK.



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Yellow ATC Sensor Failure,Code12
Magenta ATC Sensor Failure,Code13
Cyan ATC Sensor Failure,Code14
The ATC Sensor detects an insufficient amount of developer.

If this failure reoccurs three times successively, an Engine NVRAM value is set preventing further printer use until the Clear Tech Rep Fault (see pg.6-20) is performed.

Troubleshooting Procedure
Step Actions and Questions Yes No 1 Is the problem toner and/or developer empty. Replace the toner or developer. Go to step 2. 2 Is the ATC sensor clean and free of dust, toner or any other contaminates? Go to step3. Clean the ATC sensor. 3 1.Check the ATC sensor wiring harness Yellow=P/J129
Magenta=P/J130 Cyan=P/J131
2.Is the wiring harness or the sensor defective? Replace the ATC Sensor and/or wiring harness. Go to step 4. 4 1.Remove the Rear Cover and RearShield.
2.Measure the voltage at...Yellow=P405B3 Magenta=P405B8 Cyan=P405A10
on the engine control board.
3.Is the voltage between+1 and
+3VDC? Replace the engine control board. Go to step 5. 5 1.Measure the voltage at...Yellow=P405B14 Magenta=P405B11 Cyan=P405A11
on the engine control board.
2.Is the voltage+5VDC? Replace the engine control board. Go to step 6. 6
1.Measure the voltage at...Yellow=P405B2 Magenta=P405B9 Cyan=P405A9
on the engine control board.
2.Is the voltage 0VDC? Replace the engine control board.
Go to step7.
1.Remove the Imaging Unit Plate cover.
2.Inspect the wiring harness between the engine control board and the developer housing assembly.
3.Is the wiring harness defective? Replace the wiring harness.
Replace the ATC Sensor.
Run approximately 10 pages of the solid fill full-page prints for this color to ensure the error is cleared.

Posted on Mar 14, 2015


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