Xerox Phaser 7400

Error Messages and Codes 3-101
Top Cover Cooling Fan Failure
Applicable Status Code:
Code U10: Top Cover Fan Failure
Initial Actions:
■ Cycle the printer's power.
■ If the problem persists follow the procedure below.
Troubleshooting Reference Table
Applicable Parts Wiring and Plug/Jack References
■ Top Cover Fan, PL12.1.4
■ IDFAN Harness, PL5.1.31
■ GTG0 Harness, PL5.1.32
■ Print Engine Map 7 (page 10-10)
■ Print Engine Map 8 (page 10-11)
■ Print Engine Imaging Unit Sensor Board (page 10-41)
Troubleshooting Procedure Table
Step Actions and Questions Yes No
1
Test the Top Cover Fan.
Run the Service Diagnostics Top Cover
Fan test.
Does the fan operate correctly.
Replace the Engine
Control Board
(
page 8-112).
Go to Step 2.
2
Check the Fan connection.
Is P/J492 securely connected?
Go to Step 3. Connect the Fan.
3
Check continuity of the Top Cover Fan
Harness.
Is the wiring harness conductive?
Replace the Fan
(
page 8-135). If the
error persists, go to
Step 4.
Replace the
harness.
4
Verify +24 volts is available to the Fan.
Disconnect IDFAN.
Is there +24 volts at IDFAN-???
Go to Step 5. Go to Step 6.
5
Check continuity of the IDFAN Harness.
Is the wiring harness conductive?
Go to Step 6. Replace the
harness.
6
Verify +24 volts is available to the Imaging
Unit Sensor Board.
Disconnect CTG0.
Is there +24 volts at CTG0-9?
Replace the
Imaging Unit
Sensor Board
(
page 8-142).
Go to Step 7.
7
Check continuity of the CTG0 Harness.
Is the wiring harness conductive?
Replace the Engine
Control Board
(
page 8-112)
Replace the
harness.