Phaser 5400 Laser Printer Service Guide 101RAP 33 Error Code U5: Fan FailurePower Off NowThe printer is detecting incorrect fan rotation.Table 54 Error Code U5: Fan Fail Troubleshooting ProcedureStep Actions and Questions Yes No1 Do both fans rotate when printer power isswitched ON?Go toStep 3.Go toStep 2.2 Are both of the fans stopped? Go toStep 4.Replace thefan that isnot running[RRP 8.4,page 309 /RRP 8-7,page 313].3 DIAGNOSTICS CHECK1. Enter Diagnostics mode.2. From the Main Menu, select Component Test / FanMotor High / press [4] to start, [0] to stop.Do the fans rotate at high speed?Replace thePrint EngineControllerBoard[RRP 8.5,page 310].Go toStep 4.4 VOLTAGE CHECK1. Switch printer power OFF. Remove power cord fromrear of printer.2. Remove the Lower Rear Cover [RRP 1.7, page 256].3. Reconnect power cord to printer. Switch printer powerON.4. Check for +24 VDC between P/J161-13 and frameground.5. Check for +0.6 VDC between P/J161-12 and frameground.Are both voltages (+24 VDC and +0.6 VDC)correct?Replace theLVPS[RRP 8.6,page 312].Replace thePrint EngineControllerBoard[RRP 8.5,page 310].5 DIAGNOSTICS CHECK1. Enter Diagnostics mode.2. From the Main Menu, select Component Test / FanMotor High / press [4] to start, [0] to stop.Do the fans rotate at high speed?Replace thePrint EngineControllerBoard[RRP 8.5,page 310].Go toStep 5.6 SUSPECT COMPONENTSThe following printer components and areas areassociated with this specific problem. One or more ofthese components or areas may have failed partially orcompletely. If you cannot isolate this problem using thesteps in this Repair Analysis Procedure, replace eachcomponent or troubleshoot each area listed below, oneat a time, until you isolate and solve the problem. Cooling Fans [RRP 8.4, page 309 / RRP 8-7,page 313] Low Voltage Power Supply (LVPS) [RRP 8.6,page 312] Wiring and connectors linking the components.
