Xerox 4400DT Service Manual - Page 105
Toner Sensor Failure, Low Toner Sensor Failure Troubleshooting Procedure, Actions and Questions
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Toner Sensor Failure Low Toner is not displayed when the Print Cartridge appears to be empty. Low Toner Sensor Failure Troubleshooting Procedure Step Actions and Questions Yes No 1 Print a Test Print. Inspect the print quality. Is the print light? Go to step 2. Return to Service Flowchart on page 2-2. 2 1. Replace the Print Cartridge (PL 8.1 on page 7-20). Go to step 3. Go to Light 2. Run 5 test prints (Configuration Page or Demo Page) (Undertoned) and inspect the print quality following the guidelines in Image-Quality Checkout Procedures on page 3-41. Prints on page 3-54. Does the print quality appear acceptable? 3 1. Enter Service Diagnostics and select Sensor Tests. Replace the Go to step 4. 2. Scroll to Toner Sensor and press OK. Engine Logic 3. Open the Front Cover and cheat the Front Cover Interlock. 4. Remove and replace the Print Cartridge two or three times. Board (RRP 9.3 on page 6-89). Does the message on the Front Panel display alternate between Toner Normal and Toner Low as you remove and replace the Print Cartridge? 4 1. Switch the printer power OFF. Go to step 7. Go to step 5. 2. Remove the Front Cover (RRP 1.6 on page 6-11) and the Left Front Cover (RRP 1.7 on page 6-12). 3. Cheat the Front Cover Interlock. 4. Switch the printer power ON. 5. On the connector PWB, check the voltage between P/J42 pin 4 and frame ground. Is the voltage 0.0 VDC with the print cartridge installed, and +3.3 VDC with the print cartridge removed? 5 Check the voltage between P/J42 pin 3 and pin 1. Is the voltage +24 VDC? Replace the Toner Sensor (RRP 5.2 on page 6-59). Go to step 6. 6 On the Connector PWB, check the voltage between Replace the Go to step 8. P/J231 pin 11 and pin 12. Connector Is the voltage +24 VDC? PWB (RRP 9.7 on page 6-94). 7 On the connector PWB, check the voltage between Go to step 8. Replace the P/J231 pin 9 and frame ground. Connector Is the voltage 0.0 VDC with the print cartridge installed, and +3.3 VDC with the print cartridge removed. PWB (RRP 9.7 on page 6-94). 3-8 Phaser 4400 Laser Printer Service Manual
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