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Troubleshooting Flowchart – 7-2
Paper Path and Components – 7-4
DC Controller Diagram – 7-5
Printer Error Troubleshooting – 7-6
LaserJet 4L/4ML: – 7-6
LaserJet 4P/4MP: – 7-6
Priority of Errors – 7-7
Recoverable Errors – 7-7
Service Errors – 7-11
LaserJet 4L/4ML – 7-11
LaserJet 4P/4MP – 7-11
Clearable Warnings (LaserJet 4P/4MP) – 7-18
Image Formation Troubleshooting – 7-19
Engine Test – 7-36
Engine Test Button Location – 7-36
Printing an Engine Test - LaserJet 4L/4ML – 7-36
Printing an Engine Test - LaserJet 4P/4MP – 7-37
Half Self Test Functional Check – 7-39
Drum Rotation Functional Check – 7-40
High-Voltage Power Supply Check – 7-41
Paper Curl – 7-42
Adjustment Procedures – 7-43
Leading Edge Adjustment – 7-43
Beam-to-Drum Mirror Adjustment – 7-44
Troubleshooting Tools – 7-46
Repetitive Image Defect Ruler – 7-46
Main Wiring Diagram – 7-47
Chapter 7
Contents Page 1
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