Xerox 4400DT Service Manual - Page 82
Main Motor Failure., U1 Motor Fail/Power Off
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Tray Failure Troubleshooting Procedure (cont'd.) Step Actions and Questions Yes No 16 1. Remove Tray 2 from the feeder. Go to step Go to step 2. Check the voltage between the lower terminal on the 18. 17. Feeder Connector and frame ground. Is the voltage +24 VDC? 17 Check the wiring harness between the Tray 1 Size PWB (P/J51) and the Tray 2 Size PWB (P/J52). Is the harness in good condition? Replace the Tray 2 Size PWB (RRP 11.19 on page 6-139) then the Tray 2 Feeder PWB (RRP 11.9 on page 6-128). Replace the Size Harness Assembly (PL 11.1 on page 7-27). 18 Replace the following components, in order, until the problem is resolved: I Stack Height Sensor (RRP 11.13 on page 6-132) I Feeder PWB (RRP 11.9 on page 6-128) I Size PWB (RRP 11.19 on page 6-139) I Engine Logic Board (RRP 9.3 on page 6-89) 19 Remove the tray now occupying the Tray 1 position and continue with Tray Motor Assembly Checkout on page 3-26. Main Motor Failure. (U1 Motor Fail/Power Off) Main Motor speed is less than specified RPM after 1.3 seconds. There is a problem with the Main Motor. Main Motor Failure Troubleshooting Procedure Step Actions and Questions Yes No 1 1. Switch the printer power OFF. Go to step 5. Go to step 2. 2. Remove the Left Interface Cover (RRP 1.1 on page 6-6), the Left Cover (RRP 1.2 on page 6-7), and the Left Plate (RRP 1.11 on page 6-16). 3. Open the Rear Cover and, if installed, remove the Duplex Unit. 4. Manually rotate the rotor of the Main Motor clockwise (as viewed from the left side of the printer). Does the rotor of the Main Motor rotate smoothly? 2 1. Open the Front Cover and remove Print Cartridge. Replace the Go to step 3. 2. Manually rotate the rotor of motor clockwise. Print Does the rotor of the Main Motor rotate Cartridge. smoothly? Phaser 4400 Laser Printer Service Manual 2-45
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