Xerox 4400DT Service Manual - Page 131
Exit Sensor, Exit Sensor Troubleshooting Procedure, Actions and Questions
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Electrical Noise Troubleshooting Procedure (cont'd.) Step Actions and Questions Yes No 9 Inspect all of the grounds in the printer. Are all the grounds securely connected? Contact Xerox Escalated HW Support. Repair the bad grounds. Exit Sensor Exit Sensor Troubleshooting Procedure Step Actions and Questions Yes No 1 1. Open the printer Rear Cover. Go to step 2. Replace the 2. Remove the Duplex Module, if installed. Fuser 3. Open the Fuser Access Cover and check that the Exit Sensor Actuator moves smoothly and is not broken. Make sure the actuator flag blocks the Exit Sensor when the access cover is closed. Assembly (RRP 6.2 on page 6-66). Is the actuator in good condition and does it move smoothly? 2 1. Enter Service Diagnostics, select Sensor Tests and Replace the Go to step 3. press OK. Engine Logic 2. Scroll to Exit Sensor (Fuser) and press OK. 3. Open the rear cover and open the Fuser Access Cover. 4. Use a folded piece of paper to block and unblock the Board (RRP 9.3 on page 6-89). Fuser Exit Sensor. Does the message on the Front Panel display alternate between With Paper and Without Paper as you block and unblock the sensor? 3 1. Switch the printer power OFF. Go to step 5. Go to step 4. 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/J27 from the Engine Logic Board. Switch the printer power ON. Check the voltage between P/J27 pin 3 and frame ground. Is the voltage 3.3 VDC? 4 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). 5 1. Switch the printer power OFF. Replace the Replace the 2. Reconnect P/J27 to the Engine Logic Board. Engine Logic Fuser 3. Switch the printer power ON. 4. Measure the voltage between P/J27 pin 5 and frame ground as you block and unblock the Fuser Exit Sensor. Board (RRP 9.3 on page 6-89). Assembly (RRP 6.2 on page 6-66). Is the voltage 3.3 VDC when the Fuser Exit Sensor is blocked and 0.0 VDC when unblocked? 3-34 Phaser 4400 Laser Printer Service Manual
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