Xerox Phaser 7300B, Service Manual, Page: 14 / 277

xii Phaser 7300 Color Printer Service Manual
Troubleshooting 3 - 67
System Boot Sequence......................................................................................... 3 - 68
Power On Self Test (POST)......................................................................... 3 - 68
Printer Malefactions or Inoperable Printer Problems .................................. 3 - 71
Verifying Power Supply Operation ..................................................................... 3 - 72
Measuring Power Supply Voltages.............................................................. 3 - 72
POWER Connector Pinout .......................................................................... 3 - 72
Safety interlocks .......................................................................................... 3 - 73
The +5 VDC Loop ....................................................................................... 3 - 74
To verify the +5 volt loop is complete:........................................................ 3 - 74
Fuser Roller Resistances.............................................................................. 3 - 75
Multi-Sheet Pick .......................................................................................... 3 - 76
Media Skewing ............................................................................................ 3 - 76
Operating System and Application Problems...................................................... 3 - 77
Network Problems ............................................................................................... 3 - 78
Print-Quality Problems ........................................................................................ 3 - 79
Test Prints, Adjustments, and NVRAM Resets 4 - 111
Test Print Samples ............................................................................................. 4 - 112
Automatic Density Control (ADC) Calibration Procedure................................ 4 - 116
Automatic Thickness Sensor (ATS) Calibration Procedure .............................. 4 - 118
Color Calibration ....................................................................................... 4 - 121
Margin Calibration..................................................................................... 4 - 121
Resetting NVRAM ............................................................................................ 4 - 122
Cleaning and Maintenance 5 - 125
Recommended tools................................................................................... 5 - 125
Periodically Replaced Parts ............................................................................... 5 - 125
Service Preventive Maintenance Procedures..................................................... 5 - 126
Cleaning the LED Lens.............................................................................. 5 - 126
Cleaning the Pick and Feed Rollers........................................................... 5 - 127
Cleaning the ADC Sensor.......................................................................... 5 - 127
Cleaning the Registration Sensor............................................................... 5 - 127
Cleaning the Contacts ................................................................................ 5 - 127
FRU Disassembly 6 - 129
Orientation of the Printer ................................................................................... 6 - 131
General Notes on Disassembly .................................................................. 6 - 131
Preparation ................................................................................................. 6 - 131
Work Notes ................................................................................................ 6 - 132
Notations in the Disassembly Text ............................................................ 6 - 132
About Screw Colors................................................................................... 6 - 132
Disassembly Procedures .................................................................................... 6 - 133