Xerox 4400DT Service Manual - Page 113
Main Motor Assembly Troubleshooting Procedure cont'd., Actions and Questions, Voltage
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Main Motor Assembly Troubleshooting Procedure (cont'd.) Step Actions and Questions Yes No 2 1. Switch the printer power OFF. Go to step 9. 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. Ensure the Rear Cover is closed. 4. Switch the printer power ON. 5. Measure the Main Motor Harness Voltages listed in the following table. From CN101 - Pin 1 CN101 - Pin 2 CN101 - Pin 3 CN101 - Pin 7 CN101 - Pin 8 To Frame Ground Frame Ground Frame Ground Frame Ground Frame Ground Are all voltages correct? Voltage +24.0 VDC +24.0 VDC +24.0 VDC +5.0 VDC +3.3 VDC 3 Are the voltages on pins 1, 2, and 3 correct? Go to step 6. Go to step 4. 4 On the Engine Logic Board, check the voltage between Go to step 5. Replace the P/J28 pins 1, 2, and 3 and frame ground. LVPS (RRP Are all three readings +24.0 VDC? 9.5 on page 6-91). 5 On the Engine Logic Board, check the voltage between Replace the Go to step P/J30 pin 2 and frame ground. Engine Logic 10. Is the voltage +24.0 VDC? Board (RRP 9.3 on page 6-89). 6 Is the voltage on pin 7 correct? Go to step 8. Go to step 7. 7 On the Engine Logic Board, check the voltage between Replace the Replace the P/J28 pin 7 and frame ground. Engine Logic LVPS (RRP Is the voltage +5.0 VDC? Board (RRP 9.5 on 9.3 on page 6-91). page 6-89). 8 On the Engine Logic Board, check the voltage between Replace the Replace the P/J28 pin 10 and frame ground. Engine Logic LVPS (RRP Is the voltage +3.3 VDC? Board (RRP 9.5 on 9.3 on page 6-91). page 6-89). 9 1. Enter Service Diagnostics and select the Motors/Fan Replace the Replace the Test. Main Motor Engine Logic 2. Scroll to Main Motor but do not press OK. 3. On the Engine Logic Board, measure the voltage between P/J29 pin 7 and frame ground. 4. Press OK to start the Main Motor test. Assembly (RRP 8.1 on page 6-84). Board (RRP 9.3 on page 6-89). Does the voltage drop from +5.0 VDC to 0.0 VDC? 3-16 Phaser 4400 Laser Printer Service Manual
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