Sharp FO IS125N - B/W Laser - All-in-One Service Manual page 116

FO-IS125N
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.
In case of PC printing
(Single sheet/continuous)
200°C
Printing started
Temperature control started
HLON
FAN
3.1.5 Electrical connection
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 Temperature fuse 1 is installed to the fusing
1 (152°C): cover. It blows off when the ambient tempera-
ture of the fusing cover rises abnormally
(152°C).
Temperature fuse Temperature fuse 2 is in close contact with the
2 (216°C): heat roller. It blows off when the heat roller tem-
perature rises abnormally high (216°C).
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.
ENGINE
Printing finished
Fig. 15
CONTROL PWB
FAX
Q400
29 HLON
(IC100)
1 RESET
IC401
-
+
+3.3V
+3.3V
CNRTH
1 +5V
2 RTH
RTH
40
OFF
CNPW/CN3
POWER PWB
CN 1
HLON PC2
3
TRA1
RL1
CN1
1
CN4
3 ACN
1 ACL
+24VS +24VMAIN
CN5
1 +24VMAIN
3 +24VS
Fig. 16
5 – 25
L
Temperature
fuse 1 (152°C)
Heater
lamp
Temperature
fuse 2 (216 ° C)
N
Thermistor