Phaser 4400 Laser Printer Service Manual 3-15Main Motor Assembly4 1. Switch the printer power OFF.2. Reconnect all the P/Js to the LVPS.3. Disconnect the following from the Engine LogicBoard: P/J35 (Stacker PWB) (RRP 10.7 on page 6-107) P/J34 (Duplex PWB) (RRP 12.4, page 6-144) P/J33 (Size 1 PWB) (RRP 3.13 on page 6-42) P/J22 (Laser) (RRP 7.4, page 6-82) P/J21 (Laser) (RRP 7.4, page 6-82) P/J23 (Connector PWB) (RRP 9.7, page 6-94) P/J31 (Output Tray Full Sensor) (RRP 6.6,page 6-72) P/J30 (Rear Interlock Switch) (RRP 9.10,page 6-97) P/J25 (Print Cartridge Sensor) (RRP 7.3,page 6-81) P/J32 (Exit Motor) (RRP 6.5, page 6-71) P/J29 (Main Motor) (RRP 8.1 on page 6-84) P/J26 (HVPS PWB) (RRP 9.6, page 6-92) P/J27 (Fuser Sensors) (RRP 6.2 on page 6-66)4. Switch the printer power ON and measure thevoltages listed in Step 1.Are all voltages correct?Go to step 5. Replace theEngine LogicBoard (RRP9.3 onpage 6-89).5 1. Switch the printer power OFF.2. Reconnect one of the plugs disconnect in step 4.3. Switch the printer power ON.4. Measure the voltages listed in Step 1.Are all voltages correct?Repeat thestep with thenextdisconnectedplug.Replace thecomponentjustconnected tothe EngineLogic Board.Main Motor Assembly Troubleshooting ProcedureStep Actions and Questions Yes No1 1. Enter Service Diagnostics and select the Motors/FanTest.2. Scroll to Main Motor and press OK.Does the Main Motor rotate?Problemsolved,return toServiceFlowchart onpage 2-2 andcontinue.Go to step 2.Power Supply Troubleshooting Procedure (cont'd.)Step Actions and Questions Yes No
