Using The Troubleshooting Procedures; General Notes On Troubleshooting - Xerox Phaser 4500 Service Manual

Using the Troubleshooting Procedures

1. Each Step in a Troubleshooting Procedure instructs you to perform a certain
action or procedure. Follow the steps sequentially in the order given until the
problem is fixed or resolved.
2.
The Actions and Questions box contains additional information and/or
additional procedures 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 3-9 for the detailed steps and functions for
testing 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 frequently ask you to take voltage readings or test
for continuity at certain test points within the printer. For detailed diagrams, see
chapter 10, "Wiring Diagrams" on page 10-1 for complete information on test
point locations and signal names.
6. Troubleshooting Procedures often ask you to replace a printer component.
Chapter 8 "FRU Disassembly" on page 8-1 provides detailed steps for removing
and replacing all major parts of the printer. Chapter 9, "Parts Lists" on page 9-1
details the location and part number for all spared parts of the printer.

General Notes on Troubleshooting

1. Unless indicated otherwise, the instruction "switch ON printer main power"
means for you to switch ON printer power and let the printer proceed through
POST to a 'Ready' condition.
2.
When instructed to take voltage, continuity or resistance readings on wiring
harness, proceed as follows; Check P/J 232–1 to P/J 210–5 by placing the red
probe (+) of your meter on pin 1 of P/J 232, and place the black probe (–) of your
meter on pin 5 of P/J 210.
3.
When you are instructed to take resistance readings between
"P/J 232 <=> P/J 210" (without specified pin numbers), check all pins. See
"Wiring Diagrams" on page 10-1 for the location of all wiring harnesses and
pins.
4.
When you are instructed to take a voltage reading, the black probe (–) is
generally 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. To locate connectors or test
points, see "Wiring Diagrams" on page 10-1 for more information.
5.
Before measuring voltages make sure the printer is switched ON, the Print
Cartridge and the paper trays are in place, and the interlock switches are actuated,
unless a troubleshooting procedure instructs otherwise.
6.
All voltage values given in the troubleshooting procedures are approximate
values. The main purpose of voltage readings is to determine whether or not a
component is receiving the correct voltage value from the power supply and if
3-4 Phaser 4500 Service Manual