C0500: Warm-Up Failure C0510: Abnormally Low Fusing Temperature C0520: Abnormally High Fusing Temperature - Minolta Di151 Service Manual

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