Error Messages and Codes 2-25Using the Troubleshooting Procedures1. Each Step in a Troubleshooting Procedure instructs you to perform a certain actionor procedure. The steps are to be followed sequentially in the order given until theproblem 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 2-26 for the detailed steps and functions for testingparts 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 "Wiring Diagrams" on page 10-251 for complete information on testpoint locations and signal names.6. Troubleshooting Procedures often ask you to replace a printer component. Thesection "FRU Disassembly" on page 6-129 provides detailed steps for removingand replacing all major parts of the printer. The section "Field Replaceable Units(FRU) Parts List" on page 7-193 details the location, quantity and part number forall spared parts of the printer.General Notes on Troubleshooting1. Unless indicated otherwise, the instruction “cycle power to the printer” means foryou to switch OFF and then back ON the printer power and let the printer proceedthrough POST to a ‘Ready’ condition.2. When instructed to take voltage, continuity or resistance readings on wiringharnesses, refer to the wiring diagrams for specific locations not called out in aprocedure.3. All voltage values given in the troubleshooting procedures are approximate values.The main purpose of voltage readings is to determine whether or not a componentis receiving the correct voltage value from the power supply and if gating (avoltage drop) occurs during component actuation. Gating signals may be nothingmore than a pulse, resulting in a momentary drop in voltage that may be difficult orimpossible to read on the average multi-meter.4. When a troubleshooting procedure instructs you to replace a non-sparedcomponent and that component is part of a parent assembly, you should replace theentire parent assembly.
