Sharp FO-2970M Service Manual - Page 52

Cnprt, Printer Pwb, Power Pwb, Control Pwb, Pwrly, Lr38784a, Sh7041, Cnrth, Cnfuse, Driver, Pwrly

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Page 52 highlights

FO-2970MU i. Electrical connection Heater lamp: The 400W halogen lamp is used. This spring presses the pressure roller with a 690g pressure on one side. Thermistor: Thermistor of chip type with good response is used to respond to rapid heating (rapid warm-up of about 8 sec) of the heat roller. Temperature fuse 1 Temperature fuse 1 is installed to the fusing cover. (132°C): It blows off when the ambient temperature of the fusing cover rises abnormally (132°C). Temperature fuse 2 Temperature fuse 2 is in close contact with the (187°C): heat roller. It blows off when the heat roller tem- perature rises abnormally high (187°C). CNPRT CONTROL PWB PRINTER PWB CNPW POWER PWB ASIC (LR38784A) 131 HLON 2 IC1 15 HLON- 127 PWRLY 1 Driver 16 PWRLY- CPU (SH7041) 118 RTH +5V CNRTH 1 +5V 2 RTH +24VS +24V CNFUSE 1 +24V 3 +24VS CNLN 1 ACL 2 ACN Fig. 16 • The heat roller surface temperature is maintained to the optimum level by controlling ON/OFF of the heater lamp according to the temperature data (voltage) from the thermistor. The heat roller surface temperature is controlled to 155°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. CNHT 1 HLL Temperature fuse (132 °C) Heater lamp CNHT 3 HLN Temperature fuse (187 °C) Thermistor 5 - 16

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FO-2970MU
Heater lamp:
The 400W halogen lamp is used.
This spring presses the pressure roller with a 690g
pressure on one side.
Thermistor:
Thermistor of chip type with good response is
used to respond to rapid heating (rapid warm-up
of about 8 sec) of the heat roller.
Temperature fuse 1
Temperature fuse 1 is installed to the fusing cover.
(132
°
C):
It blows off when the ambient temperature of the
fusing cover rises abnormally (132
°
C).
Temperature fuse 2
Temperature fuse 2 is in close contact with the
(187
°
C):
heat roller. It blows off when the heat roller tem-
perature rises abnormally high (187
°
C).
131
CNPRT
PRINTER PWB
POWER PWB
CONTROL PWB
2
15
HLON-
127
1
16
RTH
CNLN
HLL
1
CNHT
+5V
IC1
PWRLY-
ASIC
(LR38784A)
CPU
(SH7041)
118
HLN
3
CNHT
ACL
1
2
ACN
+5V
1
CNRTH
2
RTH
+24V
+24VS
+24V
1
CNFUSE
3
+24VS
Driver
Temperature
fuse (132
°
C)
Temperature
fuse (187
°
C)
Heater
lamp
Thermistor
CNPW
HLON
PWRLY
•
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 tem-
perature is controlled to 155
°
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.
i. Electrical connection
Fig. 16
5 – 16