Protection Against Abnormality - Konica Minolta BIZHUB 750 Service Manual

Theory of Operation Ver1.0 Aug.2005
21.3.3

Protection against abnormality

When the temperature detected by the thermostats /3 (TS3) [1] gets to 180 ± 7°C, the AC power line to the fus-
ing heater lamp/1 (L2) and /2 (L3) is cut off to turn off L2 and L3. When the temperature to detect the thermostat
/4 (TS4) [2] reaches 110 ±10°C, the AC power line to the fusing heater lamp/3 (L4) is cut off to turn L4 OFF. The
thermistors /1 (TH1) [4] and /2 (TH2) [3] detect the temperature of the fusing roller/Up at the center and on both
ends at a specified interval. When an abnormal temperature is detected, the power supply to L2, L3 and L4 is
turned off with a trouble cord displayed on the operation panel. For details of the abnormality detected, see the
trouble codes.
[2]
[1] Thermostat /3 (TS3)
[2] Thermostat /4 (TS4)
CBR1
CBR2
[3] [4]
[3]
[4]
RL1
TS3
TS4
TH1
TH2
21. FUSING SECTION
[1]
Thermistor /2 (TH2)
Thermistor /1 (TH1)
L2
AC
drive
L3
section
L4
DCPS1
AC
control
Control
section
section
ADUDB PRCB
57aat2e010na
RL1
RL
drive
section
57aat2e011na
83