Read Sharp AR-M165-207 (serv.man17) Service Manual online
AR-M207 M165 M162 ELECTRICAL SECTION 13-4
(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
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.
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.
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.
The CPU controls ON/OFF of the heater lamp by this input voltage level.
Reset_OUT
(ASIC Reset)
VCC3
VCC3
R18
11kF
11kF
C23
0.1u
0.1u
C24
22000p
22000p
R21
10kF
10kF
IC4
1
2
3
M51957BFP
NC
8
GND
4
VCC
7
NC
1
IN
2
NC
3
Cd
5
OUT
6
R19
10kJ
10kJ
CPU
PF6
IC5A
/RES
ASIC
FTH
RTH
THOPEN
RTH_IN
(TCCNT)
TCCNT
24V
24V
VCC3
VCC3
24V
VCC3
VCC3
5V
VCC3
24V
24V
24V
T416
1
T403
1
T380
1
T421
1
+
-
IC23B
KIA393F-EL
5
6
7
8
4
R88
7.5kF
7.5kF
+
-
IC27B
KIA358F-EL
5
6
7
8
4
R113
1.2kF
1.2kF
R98
2.7kF
2.7kF
R115
10kF
10kF
T404
1
D3
DAN202U or KD
S121
1
2
3
R114
10kJ
10kJ
D2
MA700
C136
22000p
R87
1MF
1MF
R109
300J
300J
R117
300J
R86
1kF
1kF
R110
100J
100J
C129
0.1u
R97
10kF
10kF
C128
22000p
22000p
C137
N.M.
+
-
IC27A
KIA358F-EL
3
2
1
8
4
C127
0.1u/50V
+
-
IC23A
KIA393F-EL
3
2
1
8
4
C130
0.1u/50V
T376
1
D5
KDS226
1
2
3
R89
1kJ
1kJ
PMCLK
HLOUT
PMCLK_A
AUD_COPY
AUD_CA
(/AUD_CA)
(/AUD_COPY)
HL
FTH
AUD_PNC
(/AUD_PNC)
DSCLK#
DSCLK
5VEN
INT5V
R288
10kJ
R94
240J
240J
T375
1
T371
1
Q5
DTC114EKA
IN
GND
OUT
R243
*0J
IC22
KID65503F
1
2
3
4
5
6
7
8
2
3
4
5
6
7
8
9
16
15
14
13
12
11
10
15
14
13
12
11
10
1B
2B
3B
4B
5B
6B
7B
G
2B
3B
4B
5B
6B
7B
G
NC
1C
2C
3C
4C
5C
6C
7C
2C
3C
4C
5C
6C
7C
T373
1
T385
1
T374
1
T372
1
T379
1
D1
1SS355
1
2
3
R93
240J
240J
[13]ELECTRICALSECTION.fm 4 ページ ２００４年１１月１２日 金曜日 午後２時２１分
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