
FrameMaker Ver.5.5E(PC) Di151 TROUBLESHOOTING
00.03.10
T-13
(4)
C0500: Warm-up Failure
C0510: Abnormally Low Fusing Temperature
C0520: Abnormally High Fusing Temperature
C0500, C0510
C0520
Relevant Electrical Parts
Fusing Heater Lamp H1
Thermoswitch TS1
Thermistor TH1
Power Supply Board PU1
Master Board PWB-A
Step
Check
Result
Action
1
Fusing Heater Lamp turns ON after the mal-
function has been reset.
YES
Correct Thermistor for
mounting position and/or
clean.
2
Thermistor operation: resistance across CN1-1
and 2 on the Fusing Unit side is infinite, as
measured with CN1 disconnected.
YES
Change Thermistor.
3
Thermoswitch and Fusing Heater Lamp opera-
tion: there is continuity across CN14-1 and 2
on the Fusing Unit side, as measured with
CN14 disconnected.
NO
Change Thermoswitch.
Change Fusing Heater
Lamp.
4
The voltage across PJ14A-3 on the Master
Board and GND is DC0 V (Fusing Heater
Lamp ON) and DC24 V (Fusing Heater Lamp
OFF) after the malfunction has been reset.
YES
Change Power Supply
Board.
Change Fuse 2 of Power
Supply Board.
NO
Change Master Board.
Step
Check
Result
Action
1
Thermistor installed at the correct position.
NO
Correct.
2
Thermistor contaminated.
YES
Clean.
3
The circuit across CN1-1 and 2 on the Fusing
Unit side is shorted as checked with CN1 dis-
connected.
YES
Change Thermistor.
NO
Change Master Board.
Change Power Supply
Board.
PJ2A-2(DC5V)
PJ2A-1(TH1 ON)
ST3
ST4
CN1
1
2
TH1
2
PJ7A-1(DC24V IN)
PJ14A-3(H1 REM)
1
PJ31-1
PJ31-10
CN14
1
2 2
1
H1
TS1
PU1
PWB-A
4007C08TAB