Engine Power-Up Sequence (Bist) - Xerox Phaser 7400 Service Manual

Troubleshooting Procedure Table
4
Does the error persist?
5
Check voltages at the Engine Control Board.
Disconnect the POWER connector.
Is the voltage at each POWER pin correct?
6 Check the POWER connector.
Reconnect the POWER Connector and cycle
printer power.
Does the error persist?
7
Check voltages at the Image Proccesor
Board.
Disconnect the CUIF connector.
Is the voltage at each POWER pin correct?
8 Check voltages at the Engine Control Board.
Disconnect the POWER connector.
Is the voltage at each POWER pin correct?

Engine Power-Up Sequence (BIST)

The following checks are made by the printer's firmware at each power-up.
1. Engine Control Board logic check
2. Imaging Unit (Missing, NVRAM (CRUM) Error, CRUM ID, Life Over)
3.
Fuser (Missing, NVRAM (CRUM) Error, Life Over)
4. Toner Cartridge (Missing, Life Over)
5. Transfer Roller (Missing, Life Over)
6.
ADC Sensor (Error)
7.
All paper sensor (Jam)
8.
Door(s) (Open)
9. Environment Sensor (Error)
10.
NVRAM (NVRAM error)
11.
Image Processor Board POST Diagnostic check
4-12
Replace the
Control Panel
(page 8-111).
Replace the
Engine Control
Board
(page 8-112).
Replace the LVPS
(page 8-121).
Replace the
Image Processor
Board
(page 8-113).
Replace the
Engine Control
Board
(page 8-112).
Phaser 7400 Color Printer Service Manual
Complete.
Go to Step 7.
Complete.
Go to Step 9.
Replace the
LVPS
(page 8-121).