Phaser 5400 Laser Printer Service Guide 173RAP 69 Erratic Printer OperationThe printer has a variety of problems that are not identified by displayed error codesor messages. Problems may range from incomplete or garbled display text tointermittent power shutdowns.Table 99 Erratic Printer Operation Troubleshooting ProcedureStep Actions and Questions Yes No1 PRINTER OPERATING ENVIRONMENT CHECKCompare the printer room environment, such astemperature, humidity, and space requirements, withthe specifications listed in General Information sectionof this manual.Does the printer room environment meet printerspecifications as listed in the GeneralInformation Section?Go toStep 2.Move theprinter to anenvironmentthat meetsprinterspecs.2 AC POWER CHECK1. Unplug the printer AC power cord from the AC walloutlet.2. Use a digital multimeter to monitor the voltage at theAC wall outlet.3. Monitor the AC voltage for 30 minutes or longer.Does the voltage at the AC wall outlet meetprinter specifications as listed in the GeneralInformation Section and does the voltage remainrelatively stable without wide fluctuations?Go toStep 3.Have anelectriciantroubleshootthe AC line.3 AC POWER CORD REPLACEMENT1. Replace the AC Power Cord.2. Monitor printer operation.Does the printer display erratic operation?Go toStep 4.Problemsolved.4 TEST PRINTS1. Enter Diagnostics mode.2. From the Main Menu, select Test Print / Print Pattern /press [4] to start printing, [0] to stop.3. Run 20 test prints.Does the printer generate test prints?Go toStep 6.Go toStep 5.5 LVPS +5 VDC CHECK1. Switch printer power OFF.2. Disconnect P/J168 from the LVPS Assembly.3. Switch printer power ON.4. Measure the voltage between P161-10 and frameground.Does the voltage between P161-10 and frameground measure +5.0 VDC?Go toStep 6.Go toStep 11.
