Xerox 4400DT Service Manual - Page 109
Front Panel Display Troubleshooting Procedure cont'd., Actions and Questions
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Front Panel Display Troubleshooting Procedure (cont'd.) Step Actions and Questions Yes No 4 On the LVPS, check the voltage on P/J282 between Repair or Replace the pins 1 and 2. replace the LVPS (RRP Is the voltage +3.3 VDC? harness 9.5 on between the page 6-91). LVPS and the Image Processor Board (PL 10.1, page 7-24). 5 On the Image Processor Board, check the voltage on Go to step 8. Go to step 6. J910 between pins 3 and 4. Is the voltage +5.0 VDC? 6 1. Switch the printer power OFF. Replace the Go to step 7. 2. Disconnect J910 from the Image Processor Board. Image 3. Switch the printer power ON. 4. Check the voltage between pins 3 and 4 on the disconnected plug. Processor Board (RRP 9.2 on Is the voltage +5.0 VDC? page 6-88). 7 On the LVPS, check the voltage between P/J 1 pins 1 Replace the Replace the and 2. Image LVPS (RRP Is the voltage +24.0 VDC? Processor +5.0 VDC 9.5 on page 6-91). Power Supply (RRP 9.4, page 6-90). 8 1. Switch the printer power OFF. Go to step 9. Replace the 2. Reconnect J790 to the Image Processor Board. Front Panel 3. Switch the printer power ON. 4. Check the voltages between the pins listed in the table in step 1and frame ground. Assembly (PL 1.1, page 7-2). Are all the voltages correct when J790 is connected? 9 1. Switch the printer power OFF. Replace the Problem 2. Reinstall or reconnect the components removed in step 1 one-at-a-time, switching on the power and checking the voltages between the pins listed in the table in step 1 and frame ground after each component is installed. 3. Replace the option just installed if the voltage fails. After all the components are reinstalled or reconnected, is the Front Panel display still erratic? Front Panel Assembly (PL 1.1, page 7-2). If the problem persists, replace the Image Processor solved. Return to Service Flowchart on page 2-2 and restart. Board (RRP 9.2 on page 6-88). 3-12 Phaser 4400 Laser Printer Service Manual
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