Xerox Phaser 7400

Error Messages and Codes 3-49
Door and Cover Errors
Close Top Cover
The Top Cover Interlock Switch indicates that the Top Cover is open.
Initial Actions:
■ Ensure that the Top Cover Latch is free of obstructions and fully closed.
■ Cycle printer power.
■ If the problem persists, follow the procedure below.
Troubleshooting Reference Table
Applicable Parts Wiring and Plug/Jack References
■ Top Cover Interlock Switch, PL6.1.18
■ HVPS, PL2.1.26
■ Print Engine Map 3 (page 10-6)
■ Print Engine Xerographics (page 10-38)
Troubleshooting Procedure Table
Step Actions and Questions Yes No
1
Check the following for evidence of fault or
damage:
■ Top Cover latch (right side)
■ Top Cover Interlock Actuator
Is there any damage or misalignment?
Replace any
damaged parts.
Go to Step 2.
2
Test the Top Cover Interlock Switch.
Run the Service Diagnostics Top Cover
Interlock Test.
Does the switch function correctly?
Replace the Engine
Control Board
(
page 8-112).
Go to Step 3.
3
Replace the Top Cover Interlock Switch
(
page 8-127).
Does the error persist?
Go to step 4. Complete.
4
Check the switch voltage on the HVPS.
Is there +5 V across CN2?
Go to Step 5. Replace the HVPS
(
page 8-119).
5
Check all pins on the HVOLT Harness
PL4.2.91 for continuity.
1. Disconnect the HVOLT ribbon cable.
2. Check continuity of HVOLT-11.
Go to Step 6. Replace the
HVOLT Harness.
6
Check the Top Cover interlock signal.
Disconnect HVOLT from the Engine Control
Board
Does the voltage change at HVOLT-11
when the switch is actuated?
Replace the Engine
Control Board
(
page 8-112).
Replace the HVPS
(
page 8-119).