Xerox 4400DT Service Manual - Page 69
Close Front/Rear Cover Troubleshooting Procedure cont'd., Actions and Questions
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Close Front/Rear Cover Troubleshooting Procedure (cont'd.) Step Actions and Questions Yes No 4 1. Switch the printer power OFF. Replace the Check the 2. Remove the Left Interface Cover (RRP 1.1 on page 6-6), Left Cover (RRP 1.2 on page 6-7), and the Left Plate (RRP 1.11 on page 6-16). 3. Disconnect P/J30 from the Engine Logic Board. 4. Measure the resistance between pins 1 and 2 on the disconnected plug as you open and close the Rear Cover. Is there continuity when the Rear Cover is closed and infinity when the Rear Cover is open? Engine Logic Board (RRP 9.3 on page 6-89). wiring between P/J30 and the Rear Cover Interlock Switch. Repair or replace the wiring or interlock switch (RRP 9.10 on page 6-97) as required. 5 Open and close the Front Cover. Replace the Go to step 6. Does the message on the display alternate between "Closed" and "Open" as you open and close the Front Cover? Engine Logic Board (RRP 9.3 on page 6-89). 6 1. Switch the printer power OFF. Go to step 7. Check the 2. Remove the Left Interface Cover (RRP 1.1 on page 6-6), Left Cover (RRP 1.2 on page 6-7), and the Left Plate (RRP 1.11 on page 6-16). 3. Disconnect P/J284 from the LVPS PWB. 4. Measure the resistance between pins 1 and 2 on the disconnected plug as you open and close the Front Cover. Is there continuity when the Front Cover is closed and infinity when the Front Cover is open? wiring between P/J284 and the Front Cover Interlock Switch. Repair or replace the wiring or interlock switch (RRP 9.9 on page 6-96) as required. 7 1. Connect P/J284 to the LVPS. 2. Switch the printer power-on. 3. On the Engine Logic Board, check the voltage between P/J28 pin 1 and frame ground. Is the voltage +24 VDC? Replace the Engine Logic Board (RRP 9.3 on page 6-89). Replace the LVPS (RRP 9.5 on page 6-91). 2-32 Phaser 4400 Laser Printer Service Manual
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