Xerox M20 - WorkCentre B/W Laser, Service Manual

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December 2006
3-15 WorkCentre M20, 4118, FaxCentre 2218 Family
IQ11, IQ12
Image Quality
IQ11 Stains on Back of Paper RAP
Use this RAP when the printed sheets have stains on the non-image side of the paper.
Procedure
WARNING
Switch off the electricity to the machine. Disconnect the power cord from the customer
supply while performing tasks that do not need electricity. Electricity can cause death or
injury. Moving parts can cause injury.
NOTE: If necessary, refer to GP 20 for the acronym list and cross reference lists of more com-
monly recognised part names.
Perform the following:
1. Check the transfer roller, PL 8.13 Item 10 and clean as necessary.
2. Check the paper path for dirt and contamination. Clean as required.
3. Check the ELA HOU - fuser assembly and if necessary, install a new ELA HOU - fuser
assembly, PL 10.15 Item 1.
IQ12 Poor Fusing RAP
Use this RAP when the image is improperly fused.
Procedure
WARNING
Switch off the electricity to the machine. Disconnect the power cord from the customer
supply while performing tasks that do not need electricity. Electricity can cause death or
injury. Moving parts can cause injury.
WARNING
Do not touch the fuser while it is hot.
NOTE: If necessary, refer to GP 20 for the acronym list and cross reference lists of more com-
monly recognised part names.
Perform the following:
1. Ensure that the paper tray settings match the paper or media size in the trays. Also
ensure the media is within specification, refer to GP 22 Paper and Media Specifications.
2. (M20F) Refer to Wiring Diagram 3. Measure the voltage across the thermistor at CN7 on
the PBA Main. The voltage measured should be approximately 2.3V. If the voltage is
incorrect, install new components as necessary:
• PBA main, PL 1.10 Item 4.
• ELA HOU - fuser assembly, PL 10.15 Item 1.
3. (4118) Refer to Wiring Diagram 9. Measure the voltage across the thermistor at CN5 on
the PBA Main. The voltage measured should be approximately 2.3V. If the voltage is
incorrect, install new components as necessary:
• PBA main, PL 1.15 Item 9.
• ELA HOU - fuser assembly, PL 10.15 Item 1.
4. (2218) Refer to Wiring Diagram 14. Measure the voltage across the thermistor at CN5 on
the PBA Main. The voltage measured should be approximately 2.3V. If the voltage is
incorrect, install new components as necessary:
• PBA main, PL 1.20 Item 9.
• ELA HOU - fuser assembly, PL 10.15 Item 1.
5. Examine the ELA - HOU fuser assembly and ensure the thermistor is in good contact with
the heat roll and is clean. If necessary, go to the 10.1 Low Heat Error RAP or the 10.2
Open Heat Error RAP.
6. Ensure the machine is being operated in the correct environmental conditions. Refer to
GP 11 Machine Specifications.
7. If the machine has been standing in a low temperature environment for a long time, try to
bring the environment up to a warmer temperature before re-trying the machine.