Service manual

FO-IS125N
5 – 25
b) PC printing
• Temperature control is started when PC starts printing.
• Temperature is controlled at 200 °C. (Heater OFF over 200
°C. Heater ON below 200 °C.
• After printing, temperature is not controlled.
• Fan motor starts revolving from the beginning of temperature
control and stops 120 seconds after printing is finished.
Temperature control is not started from the start of printing
because the first copying time should be within 28 seconds.
3.1.5 Electrical connection
The heat roller surface temperature is maintained to the optimum level
by controlling ON/OFF of the heater lamp according to the tempera-
ture data (voltage) from the thermistor. The heat roller surface temper-
ature is controlled to 200°C. Two temperature fuses are provided to
protect the heat machine from an abnormally high temperature in the
fusing section. The heater lamp is lighted by the AC power.
Fig. 15
Printing started
HLON
FAN
OFF
200°C
Temperature control started
Printing finished
In case of PC printing
(Single sheet/continuous)
Heater lamp: The 500W halogen lamp is used.
Thermistor: Thermistor of chip type with good response is
used to respond to rapid heating of the heat
roller.
Temperature fuse
1 (152°C):
Temperature fuse 1 is installed to the fusing
cover. It blows off when the ambient tempera-
ture of the fusing cover rises abnormally
(152°C).
Temperature fuse
2 (216°C):
Temperature fuse 2 is in close contact with the
heat roller. It blows off when the heat roller tem-
perature rises abnormally high (216°C).
Fig. 16
POWER PWBCONTROL PWB
HLON
29
CN4
L3
CN
PC2
TRA1
RL1
1
+3.3V
FAX
ENGINE
(IC100)
40
N1
CN1
ACN3
1ACL
+5V1
CNRTH
2RTH
+24VMAIN+24VS
+24VMAIN1
CN5
3+24VS
Temperature
fuse 1 (152°C)
Temperature
fuse 2 (216
° C)
Heater
lamp
Thermistor
CNPW/CN3
1
HLON
IC401
-
+
+3.3V
Q400
RESET
RTH