Xerox 4400DT Service Manual - Page 99

Troubleshooting Procedures Index of Troubleshooting Procedures Verifying AC Power 3-2 DC Power (LVPS 3-4 DC Power Loading 3-6 Toner Sensor Failure 3-8 Inoperative Printer 3-9 Malfunctioning Front Panel 3-11 Inoperative Front Panel 3-13 Erratic Printer Operation 3-13 Power Supply 3-14 Main Motor Assembly 3-15 Laser Assembly 3-17 Fuser Assembly 3-18 Registration Sensor 3-20 MPT No Paper Sensor 3-21 Tray 1 No Paper Sensor 3-22 Output Tray Full Sensor 3-22 Stack Height Sensor Checkout 3-23 Print Cartridge Sensor Assembly . . . . . 3-24 Tray Motor Assembly Checkout 3-26 Registration Clutch 3-27 Turn Roller Clutch Assembly 3-28 Tray 1 Feed Clutch 3-29 MPT Pick Up Solenoid 3-30 Image Processor Isolation 3-31 High-Voltage Power Supply (HVPS) Assembly 3-31 Electrical Noise 3-33 Exit Sensor 3-34 Exit Motor 3-35 550-Sheet Feeder Feed Clutch 3-36 Stacker Full Sensor 3-37 Stacker Offset Operation Not Performed3-38 Envelope Feed Clutch 3-38 Envelope No Paper Sensor 3-39 Verifying AC Power There is a possible problem with AC power. Warning: Improper connection of the grounding conductor can result in the risk of electrical shock. The following must be observed: I Never use a ground adapter plug to connect the machine to a power source. I Never attempt any maintenance function that is not specifically called out in the service procedures. I Never remove any covers that are fastened with screws, unless so instructed in the service procedures. Caution: If any of the voltage measurements are not as specified in the following steps, the cause must be corrected. Caution the customer NOT to connect the machine to the wall outlet. Advise the customer that a licensed electrician must correct the wiring. Do not attempt to correct the wiring yourself. If you later find the condition has not been corrected, inform your manager in writing of the improper wiring. 3-2 Phaser 4400 Laser Printer Service Manual