April 2010
2-36
Phaser 3635MFP/WorkCentre 3550
10-300, 10-500
Status Indicator RAPs
2. Check the voltage at the thermistor on the Main PWB at, 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 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 CN26 on the Main PWB.
If necessary, install a new fuser connector, PL 10.12 Item 15.
NOTE: Over heating at both ends of the fuser assembly can occur if narrow paper (e.g. SEF
A5 or SEF 8.5 x 5.5 inch) is continuously fed at the normal ppm rate of the machine. The func
-
tion of the paper width sensor is to monitor the print output of narrow paper and initialise a slow
down of the machines ppm rate, and thereby prevent damage to the fuser. The paper width
sensor does not have a component control code.
8. Connect a service meter between CN14 pins 5 and 6 on the Main PWB Actuate the paper
width sensor. If the voltage changes from +3.3V to 0V, the sensor is good. If necessary
install a new paper width sensor,
PL 10.30 Item 2.
9. Check the wiring between the paper width sensor and CN14 on the Main PWB
10. Check that the paper width sensor is clean and not damaged, PL 10.30 Item 2. If neces-
sary install a new paper width sensor.
11. Check that the paper width sensor actuator moves freely and is not damaged, PL 10.30
Item 13.
12. 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.
10-500 Fuser Warning RAP
10-500 The machine has detected that the fuser assembly is near the end of its life.
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.
1. No immediate action is necessary. Ensure that a replacement fuser assembly, PL 10.10
Item 1 is in stock.
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General
Weight and Dimensions
