2-28 Phaser 4400 Laser Printer Service Manual6 1. Remove the Left Interface Cover (RRP 1.1 onpage 6-6), Left Cover (RRP 1.2 on page 6-7), and theLeft Plate (RRP 1.11 on page 6-16).2. Enter Service Diagnostics and select Motors/FansTests.3. Scroll to Stacker Motor.4. On the Engine Logic Board, measure the voltagebetween P/J35 pin 6 and frame ground as you pressOK.Does the voltage drop from +3.3 VDC to+0.5 VDC when OK is pressed?Go to step 7. Replace theEngine LogicBoard (RRP9.3 onpage 6-89).7 1. Switch the printer power OFF.2. Remove the Stacker from the printer (RRP 10.1 onpage 6-101) and turn the Stacker upside down.3. Disconnect P/J210 from the Stacker PWB.4. Check the resistance between pins 1 and 4, pins 1and 6, pins 2 and 3, and pins 2 and 5 on thedisconnected plug.Are all readings 70 ± 10 ohms?Replace theStacker PWB(RRP 10.7onpage 6-107).Replace theStackerMotor (RRP10.8 onpage 6-108).8 1. Open the Stacker Rear Cover.2. Press OK to run the Stacker Motor.3. Check the Stacker rollers.Are the Stacker Rollers rotating smoothly?Go to step 9. Repair orreplace theStackerRollers asnecessary(RRP 10.14onpage 6-114/RRP 10.15onpage 6-115).9 1. Switch the printer power OFF.2. Remove the Stacker (RRP 10.1 on page 6-101).3. Open the printer rear cover and check the movementof the Exit Gate.Does the Exit Gate move freely in bothdirections when pressed and released?Go to step10.Repair orreplace theExit Gate asnecessary(RRP 6.4 onpage 6-69).10 1. Reinstall the Stacker.Note: Each time the printerís rear cover or frontcover is opened and closed with powerapplied, the printer performs a reset. At thecompletion of the reset, the Exit Gate togglesbetween fully open and fully closedpositions.2. Open the printer rear cover. Remove the Duplex Unitif installed.3. Switch the printer power-on.4. Cheat the Rear Cover Interlock and watch the ExitGate at the end of reset.5. Remove then replace the Rear Cover Interlockcheater.Does the Exit Gate toggle at the completion ofeach reset?Replace theStacker PWB(RRP 10.7onpage 6-107).If theproblempersists,replace theEngine LogicBoard (RRP9.3 onpage 6-89).Replace theDirectionSolenoid(RRP 10.10onpage 6-110).If theproblempersists,replace theStacker PWB(RRP 10.7onpage 6-107).Stacker Jam Troubleshooting Procedure (cont'd.)Step Actions and Questions Yes No
