Xerox WorkCentre M20 Service Manual page 66

10.2 Open Heat Error RAP
During normal operation, the temperature has dropped below the operating level.
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. Remove the ELA HOU - fuser assembly. Check that the ther-
mistor is clean and is in good contact with the fuser roll.
2. Check the wiring from the thermistor to CN7 on the PBA main.
3. Check for continuity between the two pins on the ELA HOU - fuser assembly, PL 10.15
Item 1, 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).
4. Check that there is continuity through the fuser heater and across the over temperature
cut-out. If necessary, install a new thermostat, PL 10.15 Item 6.
5. 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. Remove the ELA HOU - fuser assembly. Check that the ther-
mistor is clean and is in good contact with the fuser roll.
2. Check the wiring from the thermistor to CN5 on the PBA main.
3. Check for continuity between the two pins on the ELA HOU - fuser assembly, PL 10.15
Item 1, 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).
4. Check that there is continuity through the fuser heater and across the over temperature
cut-out. If necessary, install a new thermostat, PL 10.15 Item 6.
Status Indicator RAPs
10.2
5. 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. Remove the ELA HOU - fuser assembly. Check that the ther-
mistor is clean and is in good contact with the fuser roll.
2. Check the wiring from the thermistor to CN5 on the PBA main.
3. Check for continuity between the two pins on the ELA HOU - fuser assembly, PL 10.15
Item 1, 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).
4. Check that there is continuity through the fuser heater and across the over temperature
cut-out. If necessary, install a new thermostat, PL 10.15 Item 6.
5. 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
2-20 WorkCentre M20, 4118, FaxCentre 2218 Family