Xerox Phaser 7400

3-102 Phaser 7400 Color Printer Service Manual
Imaging Unit Fan Failure
Applicable Status Code:
Code U11: Imaging Unit 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
■ Imaging Unit Fan, PL6.1.23
■ 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 Imaging Unit Fan.
Run the Service Diagnostics Imaging Unit
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/J100 securely connected?
Replace the Fan
(
page 8-133). If the
error persists, go to
Step 3.
Connect the Fan.
3
Check for +24 V at the Fan.
Disconnect P/J100.
Is there +24 V between J100-1 <=>
ground?
Go to Step 4. Go to Step 5.
4
Check continuity of the IDFAN Harness.
Is the wiring harness conductive?
Go to Step 5. Replace the
harness.
5
Check for +24 V at the Imaging Unit
Sensor Board.
Disconnect CTG0.
Is there +24 V at CTG0-9?
Replace the
Imaging Unit
Sensor Board
(
page 8-142).
Go to Step 6.
6
Check continuity of the CTG0 Harness.
Is the wiring harness conductive?
Replace the Engine
Control Board
(
page 8-112)
Replace the
harness.