Xerox 4400DT Service Manual - Page 39

Service Flowchart The Service Flowchart outlines one possible approach to troubleshooting and repair of the printer. The Service Flowchart is an overview of the path a service technician could take, using this technical manual, to service the printer and options. If you choose not to use the Service Flowchart, it is recommended that you start at the appropriate troubleshooting table and proceed from there. Step 1: Identify the Problem: 1. Verify the reported problem does exist. 2. Check for any error codes and write them down. 3. Print Test Prints. 4. Make note of any print-quality problems in the Test Prints. 5. Make note of any mechanical or electrical abnormalities present. 6. Make note of any unusual noise or smell coming from the printer. 7. Print a Usage Profile Report, if the printer is able to print. 8. View the fault history under the Service Tools Menu 9. Verify the AC input power supply is within proper specifications. Step 2: Inspect and Clean the Printer: 1. Switch OFF printer power. 2. Disconnect the AC power cord from the wall outlet. 3. Verify the power cord is free from damage or short circuit and is connected properly. 4. Remove the Print Cartridge and protect it from light. 5. Inspect the printer interior and remove any foreign matter such as paper clips, staples, pieces of paper, dust or toner. 6. Clean the printer interior with a lint-free cloth, dampened slightly with cold water and mild detergent. I Do not use solvents or chemical cleaners to clean the printer interior. I Do not use any type of oil or lubricant on printer parts. I Use only an approved toner vacuum. 7. Clean all rubber rollers with a lint-free cloth, dampened slightly with cold water and mild detergent. 8. Inspect the interior of the printer for damaged wires, loose connections, toner leakage, and damaged or obviously worn parts. 9. If a Print Cartridge appears obviously damaged, replace with a new one. Step 3: Find the Cause of the Problem: 1. Use the Print Engine Error Messages table (page 2-11) or POST Error Code table (page 2-58) to find the cause of the problem. 2. Use Diagnostics to check printer and optional components. 3. Use the Wiring Diagrams and Plug/Jack Locator to locate test points. 4. Take voltage readings at various test points as instructed in the appropriate troubleshooting procedure. 5. Use the Engine Logic Board Test Print on page 3-49, to isolate print capability problems between the print engine the Image Processor Board. Step 4: Correct the Problem: 1. Use the Parts List to locate a part number 2. Use the Removal and Replacement Procedures to replace the part. Step 5: Final Checkout: 1. Test the printer to be sure you have corrected the initial problem and there are no additional problems present. 2-2 Phaser 4400 Laser Printer Service Manual