OverviewPhaser® 6120 Color Laser Printer Service Manual4-2OverviewTroubleshooting procedures isolate a problem to a specific component or subassembly. Locatethe Jam or Error Code troubleshooting procedure and follow the steps through completion andreplace any component that fails a troubleshooting “Check Procedure”. If you go through theprocedures and are still unable to solve the problem, re-read the “Theory of Operation” sectionfor the problem area to understand how that section of the printer functions.Before Troubleshooting: Advance ChecksBefore attempting to solve the customer’s problem, the following advance checks must bemade:1. Verify that the AC power supply is within proper specifications. See OperatingEnvironment on page 1-8.2. Verify that the power cord is free from damage and connected properly.3. Does the machine share a power supply with any other machine that draws a large currentintermittently (for example, an elevator or air conditioner that generates electrical noise)?4. Is the installation site level and environmentally appropriate (for example, away from hightemperatures, high humidity, direct sunlight, direct ventilation, etc.?5. Does the customer file have a problem that may cause a defective image?6. Are the density control setting in the Quality menu correct?7. Is the correct media being used for printing?8. Are the maintenance and supply items correctly installed and not at the end of their usefullife?9. Is there an adequate supply of toner in the toner cartridges?10. Is the problem visible on the internal printable pages?Precautions for Servicing the Printer1. Unplug the machine’s power cord before starting a service job procedure.2. If it is necessary to service the machine with the power turned ON, use extreme cautionnot to get caught in the cables or drive assemblies of the exposed component.3. Use special care when handling the Fuser, which can be extremely hot.Caution: Turn the printer off and wait at least 5 minutes to cool before you attempt toservice the Fuser or adjacent areas.4. The Developing Unit has a strong magnetic field. Keep watches and measuringinstruments away from it.5. Take care not to damage the PC Drum in the Imaging Unit.6. Do not touch any electrical components unless you are instructed to do so by a serviceprocedure.
