Minolta Di251 - Page 336

FrameMaker Ver.5.5(PC) Di251/Di351 TROUBLESHOOTING
05.03.01
T- 3 8
C0500,C0510
C0520
Step Check Result Action
1 Fusing Roller Heater Lamp turns ON when the
Side Cover is opened and closed.
NO Check step 3 and onward.
2 The resistance of Fusing Roller Thermistor
(across CN25-2 and 3 on the Fusing Unit end)
is infinity.
YES Change Fusing Roller
Thermistor.
NO Change Master Board.
3 There is continuity across CN3-1 and 2 on the
Fusing Unit end.
YES Check step 7.
4 Fusing Roller Heater Lamp is conducting. NO Change Fusing Roller
Heater Lamp.
5 Fusing Roller Thermostat is conducting. NO Change Fusing Roller
Thermostat.
6 Fusing Roller Heater Lamp Fuse is conducting. NO Change Fusing Roller
Heater Lamp Fuse.
7 There is continuity across 1A and 1B, and
across 2A and 2B, when Side Cover Interlock
Switch 2 is actuated.
YES Change Power Supply
Unit.
Change Master Board.
NO Change Side Cover Inter-
lock Switch 2.
Step Check Result Action
1 Fusing Roller Thermistor is dirty. YES Clean.
2 The circuit across CN25-2 and -3 on the Fus-
ing Unit end is shorted.
YES Change Fusing Roller
Thermistor.
NO Change Master Board.