Xerox 4400DT Service Manual - Page 130
Electrical Noise, Electrical Noise Troubleshooting Procedure, Actions and Questions
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Electrical Noise Electrical Noise Troubleshooting Procedure Step Actions and Questions Yes No 1 1. Check if there is other electrical equipment, such as Go to step 2. Problem electrical generators, radio transmitters, or devices solved. using electrical motors, within ten feet of the printer. 2. Shut off the other electrical equipment, or relocate the printer at least twenty feet away from other devices. Is the Electrical Noise problem still present? 2 1. Disconnect the AC power cord from the wall outlet. Go to step 3. Inform the 2. Check the AC wall outlet and power cord (see Verifying AC Power on page 3-2). customer of insufficient Is the AC wall outlet correctly wired and voltage or grounded? improper wiring. A licensed electrician must correct the wiring. 3 1. Open the Front Cover. Go to step 4. Replace as 2. Remove the Print Cartridge. necessary: 3. Inspect both spring-loaded High Voltage contacts on the Transport Chute Assembly and the terminals on the Print Cartridge. I Transport Chute Assembly Are the terminals in good condition and (RRP 6.1 on contacting properly when the cartridge is page 6-65) installed? I Print Cartridge (PL 8.1, page 7-20). 4 1. Remove the Plate Handle (RRP 1.2 on page 6-7). Go to step 5. Attach the 2. Inspect the grounding screw and wire connected to the Main Power Connector. grounding screw Is the cable grounded properly? properly. 5 Replace the Print Cartridge (PL 8.1, page 7-20). Go to step 6. Problem Is the Electrical Noise problem is still present? solved. 6 1. Remove the Fuser Assembly (RRP 6.2, page 6-66). Go to step 7. Tighten the 2. Remove the end covers (see RRP 6.9, page 6-77). 3. Inspect the Heater Rod securing screws and lead wires. securing screws or replace the Are the securing screws tight and the lead wires Fuser in good condition? Assembly (RRP 6.2 on page 6-66). 7 Disconnect the HVPS (P/J26) from the Engine Logic Replace the Go to step 8. Board. Run 20 Test Prints (the prints will be blank). HVPS PWB Do the Test Prints run normally? Assembly (RRP 9.6 on page 6-92). 8 Replace the Engine Logic Board (RRP 9.3 on page 6-89). Is the problem still present? Go to step 9. Problem solved. Phaser 4400 Laser Printer Service Manual 3-33
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