How to open fixing heater open - Canon PC-940 Black and White Copier

• Code: E000-0000
• Description:The reading of the main thermistor does not reach 30C 1 sec after the main power switch is turned on. Or, it does not reach 70C 2 sec thereafter
• Causes:The fixing film unit is faulty. The main thermistor has an open circuit. The fixing heater has an open circuit. The main power supply PCB is faulty. The DC controller PCB is faulty. To reset the error, execute the following in service mode: COPIER>FUNCTION>CLEAR>ERR.
• Remedy:1. Connector Is the connector of the fixing assembly connected? a. main power supply PCB (J8) <-> relay connector <-> heater b. DC controller PCB (J320) <-> relay connector <-> thermistor NO: Connect the connector. 2. Fixing film unit (thermistor) Check the interval between pin 1 and pin 2 and between pin 3 and pin 4 of the connectosr (4-pin) of the thermistor for electrical continuity. Is it W (open)? YES: The heater has an open circuit, or the thermal switch is open. Replace the fixing film unit. 4. Main power supply PCB, DC controller PCB Press the Start key. Is the drive voltage of the heater supplied by the connector J8 of the main power supply PCB? Main heater: between J8-1 (FSR1) and J8-5 (FSR COM) Sub heater: between J8-3 (FSR2) and J8-5 (FSR COM) YES: The heater drive power supply is faulty. Replace the main power supply PCB. NO: The thermistor control mechanism is faulty. Replace the DC controller PCB.

• Code: E001-0000
• Description:The main thermistor detects 250C or higher
• Causes:The fixing film unit is faulty (i.e., the thermistor has a short circuit). The main power supply PCB is faulty. The DC controller PCB is faulty. Caution To clear the error, execute the following in service move: COPIER>FUNCTION>CLEAR>ERR.
• Remedy:Check the interval between pin 1 and pin 2 and between pin 3 and pin 4 of the connectors (4-pin) of the thermistor for electrical continuity. Is it 0 W (short circuit)? YES: The thermistor has a short circuit. Replace the fixing film unit. If the thermistor has a short circuit, the indication in service mode (COPIER>DISPLAY>ANALOG) will be as follows from the start: FIXC= 250°C for the main thermistor; FIX-E=310°C for the sub thermistor. 2. Main power supply PCB, DC controller PCB Try replacing the main power supply PCB. Is the problem corrected? YES: End. NO: Replace the DC controller PCB.

Probably the heater core. I backflushed my Dodge Dakota and that fixed the problem. Determine which hose is the supply and the rerurn hose. Take them both loose and back flush with your outside hose pipe. Do NOT turn the hose on full blast you could damage the heater core. I opened my hose bibe 1 turn open after fitting a connection to the heater hose. I back flushed, then forward flushed and back flushed a 2nd time. I saw it done on You Tube. Fixed my Dodge! Blows HOT air now!!

No code has a one size fits all fix, but here are the possible causes.
P0429 - Catalyst Heater Control Circuit Bank 1

Possible causes- Catalyst Heater Control harness is open or shorted
- Catalyst Heater Control circuit poor electrical connection
- Faulty Powertrain Control Module

Since it is likely dark already, if you haven't fixed it yet you will need to fix it before the next party. There are two issues, finding a new fusable link and figuring out why your fusable link opened. If I am correct, the fusable link opens when heat from the heater goes past it instead of out the exhaust vent. For this reason, if you only replace the fusable link it will also open when heating unless whatever causes it to open is not repaired also.

I hope this helps.

E002
The main thermistor (TH1) has poor contact or an open circuit. The thermal
switch has an open circuit (TP1). The fixing heater has an open circuit. The
AC driver PCB is faulty. The DC controller PCB is faulty. The door switch
is faulty.

E002
0000 The temperature of the fixing film is as follows:
1. has exceeded 100°C, but does not reach 115°C within 1 sec thereafter.
2. has exceeded 140°C, but does not reach 150°C within 1 sec thereafter.
3. has exceeded 160°C, but does not reach 165°C within 1 sec thereafter.

Main cause: The fixing film unit is faulty (i.e., the main thermistor TH1 has poor contact,
or the fixing heater is faulty). The main power supply PCB is faulty.
The DC controller PCB is faulty.

Caution: To clear the error, execute the following in service mode:
COPIER>FUNCTION>FCLEAR>ERR.

Action See the description for E003.

E003
Action
1. State
Turn on the power switch, and clear E002/E003. Thereafter, turn off and
then on the power switch. Does the fixing heater operate?
NO: See "The fixing heater fails to operate."
2. Wiring
Is the wiring from the DC controller PCB to the fixing film unit normal?
NO: Correct the wiring.
3. Fixing film unit, DC controller PCB
Try replacing the fixing film unit. Is the problem corrected?
YES: End.
NO: Replace the DC controller PCB.

E004
The main thermistor (TH1) has an open circuit or has poor contact. The sub thermistor (TH2) has an open circuit or
has poor contact. The thermal switch (TGP1) has an open circuit. The main heater (H1)/sub heater (H2) has an open
circuit. The AC driver PCB is faulty. The DC controller PCB is faulty.

E004 0001 protection circuit error of the fixing unit

Description: A short-circuit is detected in the triac (for 1 sec or more continuously) while the heater remains off (hardware detection) for 40 msec continuously.

Remedy: Turn off and then on the main power supply.

Remarks: fixing assembly triac malfunction/13V power supply error

E000 0000
The reading of the main thermistor does not reach 30°C 1 sec after the main
power switch is turned on. Or, it does not reach 70°C 2 sec thereafter.

Main cause:
The fixing film unit is faulty. The main thermistor has an open circuit. The
fixing heater has an open circuit. The main power supply PCB is faulty. The
DC controller PCB is faulty.

Caution:
To reset the error, execute the following in service mode:
COPIER>FUNCTION>CLEAR>ERR.

Action:
1. Connector
Is the connector of the fixing assembly connected?
a. main power supply PCB (J8) <-> relay connector <-> heater
b. DC controller PCB (J320) <-> relay connector <-> thermistor
NO: Connect the connector.

2. Fixing film unit (thermistor)
Check the interval between pin 1 and pin 2 and between pin 3 and pin 4 of
the connectosr (4-pin) of the thermistor for electrical continuity. Is it ¥W
(open)?
YES: The heater has an open circuit, or the thermal switch is open. Replace
the fixing film unit.

4. Main power supply PCB, DC controller PCB.
Press the Start key. Is the drive voltage of the heater supplied by the connector
J8 of the main power supply PCB?
Main heater: between J8-1 (FSR1) and J8-5 (FSR COM)
Sub heater: between J8-3 (FSR2) and J8-5 (FSR COM)
YES: The heater drive power supply is faulty. Replace the main power
supply PCB.
NO: The thermistor control mechanism is faulty. Replace the DC controller
PCB.

The cardboard in front of the radiator is only good if the problem is an open thermostat. If the problem is a bad heater control valve, then blocking the radiator could over heat the engine. I suggest comparing how hot the radiator hose feels, as compared to the heater hose. Watch the heater valve when you operate the control knob, to see if it is opening and closing properly.

Fuser error probally needs fuser replaced and the reset as below

try this

1. Hit Additional Functions Key
2. Hit # key
3. Arrow to number 7, Printer and hit Set
4. Arrow to number 4, Printer Re-Set and hit Set.
5. Yes, re-set printer (hit minus key - back arrow).
6. Unplug the machine and plug it back in.

or this is explaination of the error and required fix from service manual.


E0000000
The reading of the main thermistor does not reach 30°C 1 sec after the main
power switch is turned on. Or, it does not reach 70°C 2 sec thereafter.
Main cause The fixing film unit is faulty. The main thermistor has an open circuit. The
fixing heater has an open circuit. The main power supply PCB is faulty. The
DC controller PCB is faulty.
Caution To reset the error, execute the following in service mode:
COPIER>FUNCTION>CLEAR>ERR.
Action
1. Connector
Is the connector of the fixing assembly connected?
a. main power supply PCB (J8) <-> relay connector <-> heater
b. DC controller PCB (J320) <-> relay connector <-> thermistor
NO: Connect the connector.
2. Fixing film unit (thermistor)
Check the interval between pin 1 and pin 2 and between pin 3 and pin 4 of
the connectosr (4-pin) of the thermistor for electrical continuity. Is it ¥W
(open)?
YES: The heater has an open circuit, or the thermal switch is open. Replace the fixing film unit.
4. Main power supply PCB, DC controller PCB
Press the Start key. Is the drive voltage of the heater supplied by the connector J8 of the main power supply PCB?
Main heater: between J8-1 (FSR1) and J8-5 (FSR COM)
Sub heater: between J8-3 (FSR2) and J8-5 (FSR COM)
YES: The heater drive power supply is faulty. Replace the main power
supply PCB.
NO: The thermistor control mechanism is faulty. Replace the DC controller
PCB.