Xerox WorkCentre M20 Service Manual page 65

10.1 Low Heat Error RAP
The fuser has failed to reach the correct operating temperature or a disconnected thermistor
has been detected.
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.
Go to the relevant procedure:
• M20F Checkout
• 4118 Checkout
• 2218 Checkout
M20F Checkout
Refer to Wiring Diagram 1 and Wiring Diagram 3. Perform the following:
1. Switch off the machine, wait 10 seconds, then switch on the machine.
2. Go to GP 1. Perform Fuser Temp Check to verify the condition of the thermistor.
3. Go to GP 1. Perform Fuser Control Test to verify the condition of the heating lamp.
4. Switch off the machine. Remove the ELA HOU - fuser assembly, PL 10.15 Item 1. Check
that the thermistor is in good contact with the fuser roll and is clean. If necessary, install a
new thermistor, PL 10.15 Item 7.
5. Check for AC supply voltage between pins 1 and 2 on the IPR - terminal fuser, PL 4.17
Item 8.
6. Check the wiring between the IPR - terminal fuser and CON2 on the SMPS + HVPS.
7. Check for continuity between the two pins on the ELA HOU - fuser assembly, where the
fuser connects to the IPR - terminal fuser, PL 4.17 Item 8.
NOTE: A cold fuser will have a resistance of approximately 46 ohms (220V/240V) or
approximately 14 ohms (110V).
8. Install new components as necessary:
• ELA HOU - fuser assembly, PL 10.15 Item 1.
• PBA main, PL 1.10 Item 4.
• SMPS + HVPS, PL 1.12 Item 4.
4118 Checkout
Refer to Wiring Diagram 7 and Wiring Diagram 9. Perform the following:
1. Switch off the machine, wait 10 seconds, then switch on the machine.
2. Go to GP 1. Perform Fuser Temp Check to verify the condition of the thermistor.
3. Go to GP 1. Perform Fuser Control Test to verify the condition of the heating lamp.
WorkCentre M20, 4118, FaxCentre 2218 Family
4. Switch off the machine. Remove the ELA HOU - fuser assembly, PL 10.15 Item 1. Check
that the thermistor is in good contact with the fuser roll and is clean. If necessary, install a
new thermistor, PL 10.15 Item 7.
5. Check for AC supply voltage between pins 1 and 2 on the IPR - terminal fuser, PL 4.17
Item 8.
6. Check the wiring between the IPR - terminal fuser and CON2 on the SMPS.
7. Check for continuity between the two pins on the ELA HOU - fuser assembly, where the
fuser connects to the IPR - terminal fuser, PL 4.17 Item 8.
NOTE: A cold fuser will have a resistance of approximately 46 ohms (220V/240V) or
approximately 14 ohms (110V).
8. Install new components as necessary:
• ELA HOU - fuser assembly, PL 10.15 Item 1.
• PBA main, PL 1.15 Item 9.
• SMPS, PL 1.15 Item 4.
• HVPS, PL 1.15 Item 10.
2218 Checkout
Refer to Wiring Diagram 13 and Wiring Diagram 14. Perform the following:
1. Switch off the machine, wait 10 seconds, then switch on the machine.
2. Go to GP 1. Perform Fuser Temp Check to verify the condition of the thermistor.
3. Go to GP 1. Perform Fuser Control Test to verify the condition of the heating lamp.
4. Switch off the machine. Remove the ELA HOU - fuser assembly, PL 10.15 Item 1. Check
that the thermistor is in good contact with the fuser roll and is clean. If necessary, install a
new thermistor, PL 10.15 Item 7.
5. Check for AC supply voltage between pins 1 and 2 on the IPR - terminal fuser, PL 4.17
Item 8.
6. Check the wiring between the IPR - terminal fuser and CON52 on the SMPS - PSP fuser.
7. Check the wiring between CON2 on the SMPS and the SMPS - PSP fuser.
8. Check for continuity between the two pins on the ELA HOU - fuser assembly, where the
fuser connects to the IPR - terminal fuser, PL 4.17 Item 8.
NOTE: A cold fuser will have a resistance of approximately 46 ohms (220V/240V) or
approximately 14 ohms (110V).
9. Install new components as necessary:
• ELA HOU - fuser assembly, PL 10.15 Item 1.
• PBA main, PL 1.20 Item 9.
• SMPS, PL 1.20 Item 23.
• HVPS, PL 1.20 Item 10.
• SMPS - PSP fuser, PL 1.20 Item 4.
December 2006
2-19
Status Indicator RAPs
10.1