Xerox 4400DT Service Manual - Page 129
High-Voltage Power Supply Readings, High-Voltage Test, Contact, Reading
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HVPS Assembly Troubleshooting Procedure (cont'd.) Step Actions and Questions Yes No 2 1. Cheat the Front Cover Interlock Switch. Go to step 4. Go to step 3. 2. Enter Service Diagnostics and select Component Checks. 3. Scroll to each of the high voltage tests listed in High Voltage Power Supply Readings table on page 3-32. 4. Measure the voltage between the contact listed and frame ground. 5. Press the Enter Key. Is at least one of the voltages correct? 3 1. Switch the printer power OFF. Replace the Replace the 2. Remove the Left Interface Cover (RRP 1.1 on HVPS (RRP Engine Logic 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. On the Engine Logic Board, check the voltage 9.6 on page 6-92). Board (RRP 9.3 on page 6-89). between P/J26 pin 2 and frame ground. Is the voltage +24 VDC? 4 Are all the voltages correct? Problem solved. Go to step 5. 5 1. Replace the Engine Logic Board (RRP 9.3 on Problem page 6-89). solved. 2. Cheat the Front Cover Interlock Switch. 3. Enter Service Diagnostics and select Component Checks. 4. Scroll to each of the high voltage tests (page 3-32). 5. Measure the voltage between the contact listed and frame ground. Press the Enter Key. Are all the voltages correct? Go to step 6. 6 Check the Transport Chute Assembly for proper installation. Is the Transport Chute properly installed? Go to step 7. Install the Transport Chute correctly. 7 Check the HVPS harness for proper connection and for Replace the Repair or damage. HVPS (RRP replace the Is the harness damaged or improperly connected? 9.6 on page 6-92). HVPS harness as necessary. High-Voltage Power Supply Readings High-Voltage Test Contact Reading Charge Roller DC Rear Transport Chute Pin Contact -425 ±40 VDC Charge Roller AC Rear Transport Chute Pin Contact 1000 ± 100 VAC Developer Bias DC Front Transport Chute Pin Contact +4.3 ± 3 VDC Developer Bias AC Front Transport Chute Pin Contact 555 ± 55 VAC Bias Transfer Roller - Transfer Roller Bushing -81 ± 8 VDC Bias Transfer Roller + Transfer Roller Bushing 0 VDC Detack Saw Detack Saw -930 ± 100 VDC 3-32 Phaser 4400 Laser Printer Service Manual
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