Xerox 7700DX Service Manual - Page 117
Troubleshooting Power Supplies and Interlocks
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Troubleshooting For Error Codes and Messages, refer to Diagnostics, Error Codes and Messages on page 2-31. The Phaser 7700 Printer has built-in diagnostics to aid in troubleshooting problems with the printer. The Service Diagnostics Menu provides a means to test sensors, motors and solenoids. Diagnostics also contains built-in test prints, and calibration and cleaning procedures. For details on error codes, messages and service diagnostics, Diagnostics, Error Codes and Messages on page 2-31. Note Before troubleshooting power supply problems, disconnect the Auxiliary Feeder or Finisher, if installed, and restart the printer. Verify the problem is still present or refer to the appropriate Option troubleshooting section. This section is ordered as follows: Troubleshooting Power Supplies and Interlocks ■ AC Power ■ Low-voltage Power Supplies [LVPS] ■ 3.3 VDC and 5 VDC LVPS ■ 24 VDC LVPS ■ 24 VDC Interlock Circuit ■ 5 VDC Interlock Circuit System problems where the printer will not come to "Ready." ■ Printer does nothing when power is turned On ■ Fan on, Front Panel LED never On ■ Fan on, Front Panel LED on, no Front Panel message ■ Front Panel continually displays Xerox Phaser 7700 splash screen ■ Front Panel continually displays "WARMING UP" ■ Front Panel displays "FATAL FAULT ENCOUNTERED" Phaser 7700 Color Laser Printer Service Manual 3-87
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