McIntosh MA7000 Service Manual page 14

4 DISPLAY/HEADPHONE
+5V
R3
COL2 J1:10
8x 22k
5L
COL1 J1:12
5L
J1:14
COL0
5L
ROW3 J1:4
5L
J1:8
ROW2
5L
COL0 J1:16
5L
ROW2 J1:6
5L
GND J1:18
5L
COL2 J2:10
5R
COL1
J2:12
5R
COL0 J2:14
5R
ROW1 J2:4
5R
ROW0
J2:8
5R
RESET J2:16
1 3
5R
GND
J2:6
+5VM
5R Q1
GND J2:18
5R R1 R2
475k
+5VM
R5
U1A
1
B+
3
MANUAL RESET
2
GND
100
AC DET J3:19 R4
+5VM
3
J3:15
L PG C1
3 L PG
R PG J3:13
3 R PG
EXT IR J3:16
3 3
+5V J3:22
3 +5V
+5V J3:23
3
GND J3:20 MA7000 PreAmp
3
1
GND J3:21
3
L MET [+] J3:1
3
L MET [-] J3:3
3
J3:7
R MET [+]
3
R MET [-] J3:4
3
23
750680 SCH
+5V +5VM
R6
C3
C4
R11
1k
F LCLK
+5V +5V
R8
8x 22k
R9
C7
10uF
+5V
U2
39 1
P0.0 P1.0 MUTE LED
38 2
P0.1 P1.1 DATA
37 3
P0.2 P1.2 SCLK
36 4
P0.3 P1.3 F LCLK
35 5
P0.4 P1.4 R LCLK
34 6
P0.5 P1.5 VOL DWN
33 7
P0.6 P1.6 VOL UP
32 8
P0.7 P1.7
31 9
EA RST
30 10
ALE P3.0
29 11
PSE P3.1
28 12
P2.7 P3.2 FP IR
27 13
P2.6 P3.3
26 14
P2.5 P3.4
25 15
P2.4 P3.5
+5V
24 16
P2.3 P3.6
23 17
P2.2 P3.7
22 18
P2.1 XTO
21 19
P2.0 XT1 R10
IR BANK
R7 1
Y1 Vout
12.0MHz SELECT
2
Vcc
3
GND
C5
MT1
C6
FRONT PANEL
IR SENSOR
U3
5
6 1 3
VCC OUT
4
GND
FRONT
D1 U1B
QA REC OUT
C2 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
QH PHONO RLY
PHONO LED
ILLUM QA PWR ON
MONO LED QB
OUT1 LED QC OUT1 CTRL
OUT2 LED QD OUT2 CTRL
QE ACC CTRL
QF
HDPH RLY QG T/O DELAY
PG/MET MUTE QH
INPUT LED
+5V
DECODER
U5
14 16
DATA DATA VCC
11
SCLK SCLK
10
RESET
9
15
SQH
QA
12
1 0V
LCLK
QB
13
2 0V
OE
QC
3 0V
QD
4
5V
QE
5 0V
C8 QF
C10
6 0V
QG
8 7 0V
GND QH
POWER GUARD LEDS
LEFT RIGHT
+5V +5V
R12
R13 R14
+5V MODE LED
DECODER
DS2
DS1
U6
14 16
DATA VCC
11
SCLK SCLK
10
RESET
9
15 5V
SQH
QA
12
LCLK 1
QB MONO LED
13
OE 2
QC OUT1 LED
3
QD OUT2 LED
4
QE U7
5
QF 1 18
C11
6
QG
2 17
7
8
GND QH
3 16
4 15
5 14
6 13
7 12
8 11
10
GND
REAR
RLY
0V
+5V
+5V
1
B+
R PG
3
2
C9 GND
U4A
13
11
12
U1D
4
6
5
L PG
U4B
MUTE
J1M
SERVER
5L
LED
J1C
CD2
5L
LED
J1O REC
5L
LED
J1Q
TUNER
5L
LED
J1E
DVD
5L
LED
J1A CD1
5L
LED
FRONT PANEL ILLUMINATION R27 J1G LED
5L
COM
L PB VOL LOGO EQ BAL R PB 4.75k
+5V +5V +5V +5V +5V +5V
R28 J2A PHONO
R15 R18 R21 R22 R23 R24 5R
LED
4.75k
MONO
R29 J2C
MONO LED 5R
DS3 DS7 DS8 LED
DS5 4.75k
DS4 DS6 R30 J2E OUT 1
OUT1 LED 5R
4.75k LED
R31
J2M OUT 2
OUT2 LED 5R
LED
4.75k
12
R32
J2O MUTE
11
U4D 5R
13
MUTE LED 4.75k LED
R33
J2Q STNDBY
+5V 5R
LED
4.75k
J2G GND
5R
MONO RLY
HDPH RLY
MET LIGHTS
J3N DATA
3
DATA
J3L
SCLK
SCLK 3
J3H R LCLK
R LCLK 3
9
J3R
FP IR
8
FP IR U4C 3
10
L M ETER ADJ
10
J3J IR MUTE
8
R17 MUTE LED 3
9
100k
U1C
CCW
L MET FB
J3B
1 3
3
J3E R MET FB
1 3
3
CCW
R16
100k
R METER ADJ
R19
2.21k L METER
J4A
1
[+]
R25
4.75k J4B L METER
2
Q2 1
[-]
R20
2.21k J5A
R METER
1
[+]
R26
4.75k J5B R METER
2
1
Q3
[-]
24
+5V
R34
J8:4 +5V
+5V 7
C12
J8:9 VOL [-]
7
U8
J8:10
VOL [-]
7
4 8
VOL DWN IN1 OUT1
7 3
VOL UP IN2 OUT2 J8:12 VOL [+]
7
J8:11
VOL [+]
7
J8:6 MONO
MONO RLY 7
RLY
J8:2 HDPH
VOLUME HDPH RLY 7
CONTROL RLY
MOTOR DRIVER
J9:11 +5V
10L
L INTENSITY
+5V
J9:1
R35
+5V 10L
200
CCW
J9:5 L GRN
1 3
MET LIGHTS 10L
J9:9 L BLU
1 3
10L
CCW
R37
200
L COLOR
J10:11 +5V
10R
R INTENSITY
J10:1
+5V
R36 +5V 10R
200
J10:5
CCW R GRN
1 3
10R
MET LIGHTS
J10:9
R BLU
1 3
10R
CCW
R38
200
L HP
J6:2
7
R COLOR
L HP J6:4
7
R HP
J6:10
7
2
3 HEADPHONES
1
R HP J6:12
7 J7
GND
J6:6
7
GND J6:8
7