AM-900U
5 – 18
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 temperature
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 PWB
CONTROL PWB
HLON-
71
11
6
CNAC
L
3
CN
PC2
TRA1
RL1
HT
+5V
PW
CIRCUIT
RLY-
16bit
CPU
(IC21)
75
N
1
CNHT
ACN
3
1 ACL
+5V
1
CNRTH
2 RTH
+24VMAIN
+24VS
+24VMAIN
1
CN6
3 +24VS
Temperature
fuse 1 (152°C)
Temperature
fuse 2 (216°C)
Heater
lamp
Thermistor
CNPW
73
IC32
PWRLY
RTH
Содержание AM 900 - Digital Office Laser Copier
Страница 120: ...AM 900U 6 13 13 Control PWB parts layout Bottom side The CONTROL PWB of the model employs lead free solder F3 F5 F7 F4 ...
Страница 122: ...AM 900U 6 15 2 LIU PWB parts layout Top side The LIU PWB of the model employs lead free solder ...
Страница 123: ...AM 900U 6 16 3 LIU PWB parts layout Bottom side The LIU PWB of the model employs lead free solder ...