Troubleshooting
Xerox Internal Use Only  Phaser 3330 and WorkCentre 3335/3345
Service Manual
2-33
03-900 GUI to Main PWB 
Communication 
Fault
User Interface cannot 
communicate with the Main 
PWB.
Power off and power on 
the machine. 
If the error persists install 
a new Main Board: 
• Phaser 3330 (PL 1.0.7, 
Parts List 1.0 Phaser 
3330 Main)
• WorkCentre 3335 and 
3345 (PL 6.1.7, Parts 
List 6.1 WorkCentre 
3335/3345 Main).
If problem persists install 
a new User Interface:
• Phaser 3330 (PL 1.1, 
Parts List 1.1 Phaser 
3330 Top Cover)
• WorkCente 3334/3335 
(PL 10.1.22, Parts List 
10.1 WorkCentre 
3335/3345 Control 
Panel
03-901 UI System Failure Communications error 
between the UI and Main 
PWB.
Power off and power on 
the machine. 
If the error persists install 
a new Main Board: 
• Phaser 3330 (PL 1.0.7, 
Parts List 1.0 Phaser 
3330 Main)
• WorkCentre 3335 and 
3345 (PL 6.1.7, Parts 
List 6.1 WorkCentre 
3335/3345 Main).
If problem persists install 
a new User Interface:
• Phaser 3330 (PL 1.1, 
Parts List 1.1 Phaser 
3330 Top Cover)
• WorkCente 3334/3335 
(PL 10.1.22, Parts List 
10.1 WorkCentre 
3335/3345 Control 
Panel)
Error Error Message Cause Initial Action Go To