Troubleshooting The 24 Vdc Lvps - Xerox Phaser 7700 Service Manual

Troubleshooting the 24 VDC LVPS

Note
Switch off power and disconnect the power cord.
Note
The 24 VDC LVPS requires a 5VDC enable signal to operate.
Ensure proper operation of the 5 VDC LVPS before proceeding.
1. Remove the rear cover and 24 VDC PS metal shield.
2. Connect AC Power and switch the printer on.
3. Check for proper AC Voltage at the connector at the bottom of the LVPS. If not
present go to the Troubleshooting AC Power section.
4. Check for the 5 VDC enable signal at P505-4 (grey wire). If not check the same
signal at the Engine Interface Board P537-6. If not present replace the Engine
Control Board (RRP 42, on page 7-190), then the Engine Interface Board (RRP
43, on page 7-191).
5. Check for 24 VDC at any of the orange wires of connector P502 at the top of the
LVPS. Unplug the connector and retest. If still no voltage, replace the LVPS
(link). If the voltage returns check the 24 VDC circuit for shorts to frame
ground in the wiring 1harness, Engine Board, Relay Board and Interlock
circuit.
Service Quick Reference Guide - Troubleshooting
3-89