Xerox 4400DT Service Manual - Page 101
DC Power (LVPS), Perform the AC Power checks before starting this procedure.
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DC Power (LVPS) This procedure is used to troubleshoot the Low-Voltage Power Supply. Note: Perform the AC Power checks before starting this procedure. . DC (LVPS) Troubleshooting Procedure Step Actions and Questions Yes No 1 1. Switch printer power OFF. Go to step 2. Replace the 2. Disconnect the power cord. AC Power 3. Remove the Left Interface Cover (RRP 1.1 on page 6-6), Left Cover (RRP 1.2 on page 6-7), and the Cord. Left Plate (RRP 1.11 on page 6-16). 4. Connect printer power. 5. Switch the printer power ON. 6. Measure the voltage on the LVPS between P/J285 pins 1 and 2. Does the voltage match the line voltage? 2 1. On the Low Voltage Power Supply, measure the Go to step 4. Go to step 3. voltage between both sides of the Fuse F1 and frame ground. Do both readings match the line voltage? 3 1. Switch the printer power OFF. Problem Replace the 2. Replace fuse F1 (125 V - 10 A / 250 V - 3 A). solved. LVPS (RRP 3. Switch the printer power ON. 4. Measure the voltage between both sides of the Fuse F1 and frame ground. 9.5, page 6-91). Do both readings match the line voltage? 4 1. Measure the voltage between LVPS P/J281 pin 1 and Go to step 9. Go to step 5. frame ground. Is the voltage +24 VDC? 5 1. On the LVPS, measure the voltage between P/J284 Go to step 7. Go to step 6. pin 2 and frame ground. Is the voltage +24 VDC? 6 1. Switch the printer power OFF. Go to "DC Replace the 2. Disconnect printer power. Power LVPS (RRP 3. Disconnect P/J 281. 4. Connect printer power. 5. Switch the printer power ON. Loading". 9.5, page 6-91). 6. Measure the voltage between LVPS P/J 281 pin 1 and frame ground. Is the voltage +24 VDC? 7 Measure the voltage between P/J 284 pin 1 and frame Replace the Go to step 8. ground. LVPS (RRP Is the voltage +24 VDC? 9.5, page 6-91). 3-4 Phaser 4400 Laser Printer Service Manual
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