McIntosh MC462

11 12
MAIN 752270 SCH 2 of 3
2
[+]
Parts marked with a triangle and exclamation point
hav e crit ical characteristics. Use only replacement
parts recommended by the manufacturer.
WARNI NG
1
1
1
BLU
GR N
BLU
D30
D31
D32
D33
5V
+5V
AC DETECTOR
0V
4
2
1
3
Vcc
GND
5
U29
+5V
150k
R87
AC DET
1
1
AC N
AC F
VIO
WHT/VIO
WHT
BLK
BLK/ GR Y
GR Y
110V/120V
A
B
C
D
E
G
H
I
J
F
BLU
GR N
BLU
WHT
BLK
D29
TEST ONLY
NO CONNECTION
APPLY 12VD C
TO ENERGI ZE RELAYS
WITH NO AC POWER
+5VHS2
150k
R89
1
1
1
1
1
1
1
1
1
1
+5V
[-]
BR N
BR N
12V .3V
-26V
26V
+5V
+5V
T PTC
THER MAL
PROTECTION
TRANSFORMER
5V
ORN
ORN
GN D
TPT C
1
1
+5V
IN OUT(TAB)
ADJ
1
23
U31
4.75k
R94
4.75k
R95
IN(TAB) OUT
ADJ
1
2 3
U32
+15V
-15V
10µF
C44
10µF
C45
PWR RLY
+12V
+12V
10k
R82
26V
-26V
350mA
t
R81
IN
ON/OFF
OUT
GND ADJ
___
TAB
1
6
2
3
4 5
U30
.047µF
C37
.01µF
C43
.15µF
C34
3300µF
C40
3300µF
C41
J13:1
J13:2
J14
J15
J16
J17
J18
J19
J20
J21
J22
J23
J24
J25
1.1A
t
R85
1.1A
t
R86
47.5k
R88
100k
R83
3
1
2
Q24
3
1
2
Q25
.1µF
C38
.1µF
C36
.1µF
C42
J11:1
J11:4
J11:7
J11:10
J12:1
J12:4
J12:10
JMP1
173085
100V
110V
120V
220V
230V
240V
2.5
NTC
RT1
2.5
NTC
RT2
J26
J27
J28
J29
J30
4
2
1
3
Vcc
GND
5
U28
2 3
1 4
K1
23
14
K2
.47µF
C35
68.1k
R84
475
R90
475
R93
475 R91
220µF
C47
220µF
C48
100µF
C46
3300µF
C39
2 6
8
4
1
3
5
7
PRIMARY
T3
274
R92
D34
D37
D35
D36