McIntosh MA7000 Service Manual page 9

3 MAIN
750856 SCH 2 of 5
INPUT RELAY
+5V
DECODER
14
DATA DATA
11
SCLK SCLK
10
RESET
9
SQH
12
LCLK
13
OE
C16
8
GND
C14
10uF
+5V
R8
R7
R LCLK 1k
J9:16
4
CONTROL
+5V
DECODER
DATA
J9:10
4 DATA
C15
SCLK J9:12
4 SCLK
14
DATA
IR MUTE J9:14
11
4 IR MUTE SCLK SCLK
10
RESET
9
SQH
FP IR 12
J9:6
LCLK
4
13
OE
C17
8
GND
+5V DATA PORT
DECODER
14
DATA DATA
11
SCLK SCLK
10
RESET
9
SQH
12
9
LCLK
8 13
OE
10
5V
EXT IR
U4C
C18
8
GND
U5
16
VCC
U10
5V
15 1 18
QA REC OUT RLY
1 0V 2 17
QB SRV RLY
0V
2 3 16
QC CD2 RLY
3 0V 4 15
QD REC RLY
0V
4 5 14
QE TUN RLY
5 0V 6 13
QF DVD RLY
6 0V
7 12
QG CD1 RLY
7 0V 8 11
QH PHONO RLY
9 10
GND
+5V
POW ER RLY
3.32k
2
R9
U6
16
VCC
15 5V
QA
1
QB
2 5V
QC
3 5V
QD
4 5V
QE
5 5V
QF
6 5V
QG
7
QH
12
11
U8D
13
9
8
U8C
10
U7
16
VCC
U9
15
QA
1 1 18
QB
2 2 17
QC
3 3 16
QD
4 4 15
QE
5 5 14
QF
6 6 13
QG
7 7 12
QH
8 11
10
GND
13
MA7000
TURN ON M UTING
TURN ON
4.75k 20K
-18V
2
R10
R12
D
5V 2 Q4
R21
C2 2
G
S
L B- -15V -15V
0V
Q3 R13
4
100
6
U4B
5
+5V
OUTPUT 2
+5V
POW ER
CONTROL
C19
R14
1
B+
100
3
U4A
2
GND
R15
9
100
8
U11C
10
OUTPUT 1
POW ER
R16
12
100 CONTROL
11
U11D
13
+5V
+5V
R17
1
B+
100
3
U11A
2
GND
C20
ACC
POW ER
CONTROL
R18
4
100
6
U11B
5
+5V
+5V
R19
1
B+
100
3
U8A
2
C21 GND
MAIN
POW ER
CONTROL
R20
4
100
6
U8B
5
OUT2 RLY
OUT1 RLY
J10A J10B
MAIN
+15V THERM
R30
2
Q8
R31
R23
12.1k
2
Q7
R24
12.1k
2
Q5 Q6
R22
-15V L THERM R THERM
THERM AL PROTECTION
1k
+15V +5V
R36
+VIR
R25
2
-
221
1
U12A
R35
3
+
D11
EXTERNAL
R26 SENSOR
DRIVER
D12
47.5
+15V +VIR
R29
D13
+VBU
R27 R32 R33 R34
J11A J11B J12 J13A J13B J14A J14B J15A
ACC 1 2 CD1 SERVER CD2 REC DVD
EXT
POW ER CONTROL DATA PORTS
SENSOR
14
FRONT REAR
QA REC OUT RLY
SERVER LED QB SERVER RLY
CD2 LED QC CD2 RLY
REC LED QD REC RLY
TUNER LED QE TUNER RLY
DVD LED QF DVD RLY
CD1 LED QG CD1 RLY
PHONO LED QH PHONO RLY
ILLUM QA PWR ON
MONO LED QB
OUT1 LED QC OUT1 CTRL
OUT2 LED QD OUT2 CTRL
QE ACC CTRL
QF MUTE
HDPH RLY QG T/O DELAY
PG/M ET MUTE QH
J9:5
AC DET
AC DETECT 4
J9:9 L PG
+5V
L PG 4
J9:11 R PG
R PG 4 4
D14
12
J9:8
EXT IR
11
U4D 4 4
13
J9:1 +5.6V
+5V 4
J9:2 +5.6V
4
+VIR
J9:3 GND
+VIR
4
6
-
J9:4 GND
7
U12B 4
5
+
R37 R38
R40
47 .5 W
J15B
TUNER