Pioneer SC-37 Service Manual page 69

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QQ
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Low Voltage Detection for Amplifier Power Supply
P
ICEPOWER AMP ASSY
Disable Signal from micro-computer.
Normally "H".
R4001
100
R4002
100
R4003
100
R4004
100
TE
L 13942296513
SL ch
IC4400 5
SR ch
SBL ch
IC4600 5
SBR ch
IC4700 5
C ch
DISPLAY
K
ASSY
www
71
UCOM
IC8001 .
5
http://www.xiaoyu163.com
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1 AMPDISABLE of modulator IC
becomes "L" when abnormal.
D4007 1SS352
R4080 R4084
VCC
3.3k 12k
Y
A
GND
IC4003
TC74VHC04FTS1
GND
D4008 1SS352
R4081 R4085
3.3k 12k
A
IC4003
D4009 1SS352
GND
R4082 R4086
3.3k 12k
D4010 1SS352
GND
R4083 R4087
3.3k 12k
GND
R4005 8.2k
R4006 8.2k
R4007 8.2k
R4008 8.2k
C4212 100u
C4213
ACH1479-A
C4112 100u
C4113
ACH1479-A
VD_CHK1
VS_CHK1
AMPOVERLOAD
DIGITAL MAIN
F
ASSY
CN601
CN8202
-18 -9
x ao u163
y
i
6
http://www.xiaoyu163.com
8
V+5V
IC4004
TC74VHC08FTS1
14
12
11
R4013
13
7
100
IC4004
GND
14
9
8
VCC
R4014
Y
10
GND 7
100
TC74VHC08FTS1
IC4004
14
4
6
VCC
R4015
Y
A
5
GND 7
100
IC4003 TC74VHC08FTS1
IC4004
14
1
VCC
R4016
Y
A
2
GND
7
100
IC4003
Q Q
3 6 7 1 3
34
R4278
CS1_ch1
35 CS2_ch1
NM RECout_ch1
36
Vin__ch1
R4213
37
100u
ACH1479-A
DC_FB_ch1
NM 1%
ACH1479-A
38
MODULATOR
Vin_ch2
R4113
39
100u
DC_FB_ch2
NM 1%
40
CS1_ch2
R4178
RECout_ch2
CS2_ch2
NM
41
Ref_ch2
42
43
44
GND GND
CONNECT
W
ASSY
CN603 CN7802
-2 -2
.
SC-37
7
2 9 9 4 2 8
2 Output of Logic Circuit becomes "L".
2SC4154(EFG)
D4011
R4088 R4089
Q4015
12k 12k
1SS301
GND
GND
R4044 R4043
D4012
100 100
C4021
1000p
1SS301
CH
GND
3
1 5 0 5 8 2 9 9 4
IC4200
ICC1-AVR
22
21
Pwm+_ch1
20
Pwm-_ch1
ZobelSense1
Mod_ch1
19
NTC_in
18
Average1
17
Average2
16
ZobelSense2
15
Mod_Ch2
Pwm+_ch2 14
Pwm-_ch2
13
12
R4124
27k
1%
C4122 R4125 R4126
R4127
2125
1k 1% 1.5k 1% 1.5k
2200p
ACG7073-A
INTERFACE
G
ASSY
m
CN7803 CN7003
-19 -19
co
7
8
9 9
A
CN4000
-8
XOLERR
B
C
2 8 9 9
D
1%
E
CN7006
-10
XOLERR
F
69
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