Phaser 7700 Color Laser Printer Service Manual
xiii
Entering Service Diagnostics Mode
.................................................................
2-35
Service Diagnostics Test Menu Functions
........................................................
2-36
Error Codes and Messages Troubleshooting
...........................................................
2-46
Voltage Measurements
............................................................................................
2-46
Fuser Connector Pin Locations
........................................................................
2-47
Troubleshooting
3-87
Troubleshooting Network Problems
........................................................................
3-88
Operating System and Application Problems
...................................................
3-88
Media Jams and the Paper Path
.......................................................................
3-88
Print Image Quality Problems
..........................................................................
3-88
Troubleshooting Power Supplies and Interlocks
.....................................................
3-89
Troubleshooting AC Power
..............................................................................
3-89
Troubleshooting the Low-voltage Power Supplies
...........................................
3-89
Troubleshooting the +3.3 VDC and +5 VDC LVPS
............................................
3-90
Troubleshooting the +24 VDC LVPS
................................................................
3-90
Interlock Circuit Diagram
.................................................................................
3-91
The +24 VDC Interlock Circuit
..........................................................................
3-91
The +5 VDC Interlock Circuit
............................................................................
3-92
Troubleshooting When the Printer Does Not Come to a “Ready” State
...................
3-93
Printer Does Nothing When Power Switched On
.............................................
3-93
Fans On, Front Panel LED Never On
.................................................................
3-93
Fans On, Front Panel LED is Red, No Front Panel message
.............................
3-93
Front Panel Continually Displays the Xerox Phaser 7700 Splash Screen
.........
3-93
Front Panel Continually Displays "warming up - please wait" Message
............
3-93
Front Panel
displays "Fatal Fault Encountered" message
.................................
3-94
Troubleshooting - Printer Comes to a “Ready” State
..............................................
3-94
False LH Door, RH Door, or Front Door Open Messages
.................................
3-94
False "Load Paper in Tray [1,2,3,4]" Message
..................................................
3-94
False "Tray [1,2,3,4] Missing" Message
...........................................................
3-94
Tray 1 Will Not Lift
...........................................................................................
3-95
Tray 2, 3 or 4 Will Not Lift
................................................................................
3-95
Tray 2, 3 and 4 Will Not Lift or
Printer Will Not Recognize the Auxiliary Feeder
......................................................
3-96
Printer Will Not Recognize the Finisher
............................................................
3-96
Troubleshooting the Toner Dispense/Auger/Developer System
..............................
3-97
Checking the Toner Cartridge
...........................................................................
3-97
Checking the Toner Auger System
...................................................................
3-98
Checking the Developer ATC Sensor
..............................................................
3-101
Checking the Developer
.................................................................................
3-102
Tips
................................................................................................................
3-102
Operation System and Application Problems
........................................................
3-104
Macintosh Printing Problems
........................................................................
3-104