3-4 Phaser 6250 Color Laser Printer Service ManualUsing the Troubleshooting Procedures1. Each Step in a Troubleshooting Procedure instructs you to perform a certainaction or procedure. The Steps are to be followed sequentially in the order givenuntil the problem is fixed or resolved.2. The Actions and Questions box contains additional information and/or additionalprocedures you must follow to isolate the problem.3. When a procedure instructs you to test a component using service diagnostics,See "Service Diagnostics" on page 3-6 for the detailed Steps and functions fortesting parts of the printer.4. The action is followed by a question. If your response to the question is “Yes”,then follow the instructions for a “Yes” reply. If your response to the question is“No”, then follow the instructions for a “No” reply.5. Troubleshooting Procedures may ask you to take voltage readings or test forcontinuity at certain test points within the printer. For detailed diagrams, refer tothe section "Plug/Jack Locator Maps" on page 10-2 and "Wiring Diagrams" onpage 10-12 for complete information on test point locations and signal names.6. Troubleshooting Procedures often ask you to replace a printer component. Thesection "Service Parts Disassembly" on page 8-1 provides detailed Steps forremoving and replacing all major parts of the printer. The section "Parts List" onpage 9-1 details the location, quantity and part number for all spared parts of theprinter.General Notes on Troubleshooting1. Unless indicated otherwise, the instruction “switch ON printer main power”means for you to switch ON printer power and let the printer proceed throughPower On Self Test (POST) to a ‘Ready’ condition.2. Conventions used in this manual to represent connectors3. When instructed to take voltage, continuity or resistance readings on wiringharness, proceed as follows; Check P/J 232–1 to P/J 210–5 by placing the redprobe (+) of your meter on pin 1 of P/J 232, and place the black probe (–) of yourmeter on pin 5 of P/J 210.4. When you are instructed to take resistance readings between “P/J 232 <=> P/J210” (without specified pin numbers), check all pins. Refer to the the section"Wiring Diagrams" on page 10-1 for the location of all wiring harnesses and pins.5. When you are instructed to take a voltage reading, the black probe (–) isgenerally connected to a pin that is either RTN (Return) or SG (Signal Ground).You can substitute any RTN pin or test point in the printer, and you can use FG(frame ground) in place of any SG pin or test point.Plug Jack6250-503
