Pioneer SC-LX81 Service Manual page 67

5
Low Voltage Detection for Amplifier Power Supply
Q
ICEPOWER AMP ASSY
Disable Signal from micro-computer.
Normally "H".
D4007 1SS352
R4080
3.3k
D4008 1SS352
R4081
3.3k
D4009 1SS352
R4082
3.3k
R4083
3.3k
R4001
100
R4005
R4002
100
R4006
R4003
100
R4007
R4004
100
R4008
SL ch
IC4400 5
SR ch
SBL ch
IC4600 5
SBR ch
IC4700 5
C ch
5
6
AMPDISABLE of modulator IC
becomes "L" when abnormal.
R4084
9 8
12k R4013
100
IC4003
TC74VHC04FTS1
GND
GND
R4085
11 10
12k R4014
100
IC4003
GND
R4086
1
12k
IC4003
D4010 1SS352
GND
R4087
12k
8.2k GND
8.2k
8.2k
8.2k
R4278
NM
C4212 100u
FR ch
C4213 100u
ACH1479-A
ACH1479-A
C4112 100u
C4113
ACH1479-A
FL ch
ACH1479-A 100u
R4178
NM
VD_CHK1
VS_CHK1
AMPOVERLOAD
6
7
V+5V
Output of Logic Circuit becomes "L".
IC4004
TC74VHC08FTS1
14
12
D4011
11
1SS352
13 7
IC4004
14
9
D4012
8
1SS352
10 7
IC4004
14
4
D4013
6
2
R4015
1SS352
5
7
100
IC4004
14
1
D4014
3
3 4
R4016
1SS352
2
7
100
IC4003
CS1_ch1
34
CS2_ch1
35
RECout_ch1
36 Pwm+_ch1
Vin__ch1 Pwm-_ch1
R4213
37 Mod_ch1
DC_FB_ch1
NM 1%
38
MODULATOR
Vin_ch2
R4113
39
DC_FB_ch2
NM 1%
40 CS1_ch2
RECout_ch2
CS2_ch2
41
Ref_ch2
42
43
44
C4122
ACG7073-A
GND GND
D-MOTHER
B
ASSY
CN2005
-10
AMP_OL
17
UCOM
IC2001
SC-LX81
7
8
CN4000
-8
Q4015
2SC4154(EFG)
R4088 R4089
12k 12k
GND
GND
R4044 R4043
100 100
C4021
1000p
CH
GND
IC4200
ICC1-AVR
22
21
20
ZobelSense1
19
NTC_in
18
Average1
17
Average2
16
ZobelSense2
15
Mod_Ch2
14
Pwm+_ch2
13
Pwm-_ch2
12
R4124
27k
1%
R4125 R4126
R4127
2125
1k 1% 1% 1.5k
1.5k 1%
2200p
INTERFACE
F
ASSY
CN7005 CN7051
-10 -10
AMP_OL
8
A
AMP_
OVERLOAD
B
C
D
E
F
67