Reset Circuit; Heater Lamp Control Circuit - Sharp AR-M207 Service Manual

(4) Reset circuit

This circuit detects ON/OFF of power to control start/stop of each circuit. The 3.3V voltage of the main PWB is detected by the reset IC to generate the
reset signal.
When the power voltage reaches the specified level, the circuit operations are started. Before the power voltage falls below the specified level, the
circuit operations are stopped to prevent against malfunctions.

(5) Heater lamp control circuit

a. Outline
The heater lamp control circuit detects the heat roller surface temperature and converts in into a voltage level. The converted voltage is inputted to the
CPU analog input pin.
The CPU converts the inputted analog voltage into a digital signal level and compares it with the set value of the simulation to control on/off the heater
lamp according to the level, maintaining the heat roller surface temperature at a constant level.
R86
1kF
D2
MA700
R97
10kF
RTH_IN
C128
22000p
TCCNT
C137
N.M.
The lower the heat roller surface temperature is, the greater the thermistor resistance is, and vise versa.
Therefore, the lower the heat roller surface temperature is, the higher the thermistor terminal voltage is, and vise versa. The thermistor terminal voltage
is inputted to the CPU analog port.
The CPU controls ON/OFF of the heater lamp by this input voltage level.
CPU
PF6
/RES
VCC3 VCC3
R18
11kF IC4
1 8
NC NC
2 7
IN VCC
3 6
NC OUT
4 5
GND Cd
R21
M51957BFP
10kF
VCC3 24V VCC3
R87 R88 R89
1MF 7.5kF 1kJ
T376
IC23A T380
3
+
1
2
-
KIA393F-EL
24V
R98
VCC3
2.7kF
C127
0.1u/50V
24V
IC27A T403 R109 T404 R110
300J 100J
3
+
1
2
-
KIA358F-EL
24V
C130
0.1u/50V
VCC3 24V 5V
R113 R114
1.2kF 10kJ
T416
IC23B
5
+
7
6
-
KIA393F-EL
R115 C136
10kF
22000p
VCC3
D5
KDS226 24V
1
3
2
IC27B T421
5
+
7
6
-
KIA358F-EL
AR-M207 M165 M162 ELECTRICAL SECTION 13-4
(ASIC Reset)
Reset_OUT
2
1
IC5A
R19
10kJ
C23 C24
0.1u 22000p
FTH
RTH
C129
0.1u
IC22
T372
1 16
PMCLK 1B 1C
2 15
DSCLK
2B 2C
T373
3 14
HL 3B 3C
T375
4 13
FTH
4B 4C
T379
5 12
AUD_PNC
5B 5C
6 11
AUD_COPY 6B 6C
7 10
AUD_CA
7B 7C
8 9 1
G NC
KID65503F
THOPEN
R117
(TCCNT)
300J
ASIC
3
INT5V
5VEN
D1
R288
DSCLK# 1SS355
10kJ
Q5
DTC114EKA
IN
T371
1
PMCLK_A
T374
2
R243 *0J
3
(/AUD_PNC)
(/AUD_COPY)
(/AUD_CA)
T385
R93
240J
R94
240J
HLOUT