Xerox 4400DT Service Manual - Page 114
Laser Assembly, Laser Assembly Troubleshooting Procedure, Actions and Questions
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Main Motor Assembly Troubleshooting Procedure (cont'd.) Step Actions and Questions Yes No 10 1. Enter Service Diagnostics and select Sensor Tests. Replace the Replace the 2. Scroll to Rear Cover Switch and press OK. Engine Logic Rear 3. Open and close the Rear Cover two or three times. Board (RRP Interlock Does the indication on the Front Panel display 9.3 on Switch (RRP alternate between Open and Close as you open page 6-89). 9.10 on and close the Rear Cover? page 6-97) or Repair or replace the wiring between the Engine Logic Board and the Rear Interlock. Laser Assembly Laser Assembly Troubleshooting Procedure Step Actions and Questions Yes No 1 1. Enter Service Diagnostics and select the Motors/Fan Go to step 5. Go to step 2. Tests and press OK. 2. Scroll to Laser Scan Motor and press OK. Can you hear the Laser Scan Motor spin up? 2 1. Switch the printer power OFF. Go to step 4. Go to step 3. 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. Switch the printer power ON. 4. Check the voltage between P/J21 pin 10 on the Engine Logic Board and frame ground. Is the voltage +24.0 VDC? 3 Check the voltage between P/J28 pin 1 on the Engine Replace the Replace the Logic Board and frame ground. Engine Logic LVPS (RRP Is the voltage +24.0 VDC? Board (RRP 9.5 on 9.3 on page 6-91). page 6-89). 4 1. Enter Service Diagnostics and select the Motors/Fan Replace the Replace the Test. Laser Engine Logic 2. Scroll to Laser Scan Motor but do not press OK. 3. Check the voltage between P/J21 pin 12 and frame ground. 4. Press OK to start the Laser Scan Motor test. Assembly (RRP 7.4 on page 6-82). Board (RRP 9.3 on page 6-89). Does the voltage drop from +5.0 VDC to 0.0 VDC? Phaser 4400 Laser Printer Service Manual 3-17
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