Xerox WorkCentre 3550 - Page 46

April 2010
2-35
Phaser 3635MFP/WorkCentre 3550
10-100, 200, 10-300
Status Indicator RAPs
10-100, 200 Open Fuser Error/Low Heat Error RAP
10-100 During normal operation, the temperature of the fuser has dropped below the operating
level.
10-200 The fuser has failed to reach the correct operating temperature.
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.
Refer to Wiring Diagram 1. Perform the following:
1. Switch off the machine, then switch on the machine.
2. Check that ACL is available between pins 1 and 2 on CON2. If ACL is not available, install
a new SMPS,
PL 1.12 Item 3.
3. Enter dC330 Component Control code 10-100 to heat the fuser to 180 degrees. Enter
code 10-200 to verify the condition of the thermistor.
4. Check the voltage at the thermistor on the Main PWB at, (3635) CN19 pin 1 or (3550) CN
26 pin 1. When the fuser is cold it will read approximately 3.17 volts, then at power on the
voltage should decrease to approximately 1.8 volts. At operational temperature the volt
-
age will remain at 2.0 volts.
5. Switch off the machine. Remove the fuser assembly. Check that the thermistor, PL 10.12
Item 16 is clean and in good contact with the fuser heat roll. Check the wiring to the ther-
mistor. If necessary install a new thermistor, PL 10.12 Item 16.
6. Check for continuity between the two pins on the fuser assembly connector, PL 10.12
Item 15.
NOTE: A cold fuser has a resistance of approximately 9 ohms (220V/240V) or 1.6 ohms
(110V).
7. Check that there is continuity through the fuser heat lamp, PL 10.15 Item 12 and across
the thermostat, PL 10.12 Item 18. Install new components as necessary.
8. 3635 only. Check the wiring between the following connectors:
a. The fuser connector, PL 10.12 Item 15 and CON2 on the SMPS.
b. The fuser connector, PL 10.12 Item 15 and CN19 on the Main PWB.
If necessary, install a new fuser connector, PL 10.12 Item 15.
9. 3550 only. Check the wiring between the following connectors:
a. The fuser connector, PL 10.12 Item 15 and CON2 on the SMPS.
b. The fuser connector, PL 10.12 Item 15 and CN26 on the Main PWB.
If necessary, install a new fuser connector, PL 10.12 Item 15.
10. If necessary:
a. Install new components:
• Fuser assembly, PL 10.10 Item 1.
•SMPS, PL 1.12 Item 3.
b. Perform OF7 Main PWB Check RAP.
10-300 Over Heat Error RAP
10-300 The fuser temperature has risen above the normal level. Although the fuser unit can
return to a normal operating temperature, the fuser may consequently be damaged.
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.
Go to the relevant procedure:
• 3635 Checkout
• 3550 Checkout
3635 Checkout
Refer to Wiring Diagram 1. Perform the following:
1. Enter code dC330 Component Control code 10-200. Perform a fuser temperature check
to verify the condition of the thermistor.
2. Check the voltage at the thermistor on the Main PWB at CN19 pin 1. When the fuser is
cold it will read approximately 3.17 volts, then at power on the voltage should decrease to
approximately 1.8 volts. At operational temperature the voltage will remain at 2.0 volts.
3. Make sure the fuser fan is working correctly, refer to the OF3 Air Systems RAP. Ensure
that the machine is positioned to allow adequate airflow, refer to GP 13 Installation Space
Requirements.
4. Switch off the machine. Remove the fuser assembly. Examine the fuser assembly for heat
damage. Install new components as necessary,
PL 10.10, PL 10.12 and PL 10.15.
5. Check that the thermistor, PL 10.12 Item 16, is clean and in good contact with the fuser.
Check the wiring to the thermistor. Check the crimp and weld quality between the wire
and thermistor terminal. Install a new thermistor if necessary,
PL 10.12 Item 16.
6. Check that there is continuity through the fuser heat lamp, PL 10.15 Item 12 and across
the thermostat, PL 10.12 Item 18. Install new components as necessary.
7. Check the wiring between the following connectors:
a. The fuser connector, PL 10.12 Item 15 and CON2 on the SMPS.
b. The fuser connector, PL 10.12 Item 15 and CN19 on the Main PWB.
If necessary, install a new fuser connector, PL 10.12 Item 15.
8. If necessary:
a. Install new components:
• Fuser assembly, PL 10.10 Item 1.
•SMPS, PL 1.12 Item 3.
b. Perform OF7 Main PWB Check RAP.
3550 Checkout
Refer to Wiring Diagram 1 and Wiring Diagram 12 (3550). Perform the following:
1. Enter code dC330 Component Control code 10-200. Perform a fuser temperature check
to verify the condition of the thermistor.