McIntosh C8AC Service Manual

MC275
9 10
MAIN 751376 SCH 1 of 3
2
2 6
8
4
1
3
5
7
PRIMARY
T1
J5:2
J5:1
[+]
350mA
t
R1
!
!
! !
D3
D4
D2
D5
.3V
.3V
16
+T°
RT2
ORN
ORN
WHT
BLK
D1
!
TEST ONLY
NO CONNECTION
APPLY 12VDC
TO ENERGIZE RELAYS
WITH NO AC POWER
1000µF
C3
220µF
C13
+5V
!
VOUT
3
GND
2
VIN
1
TAB
4
U1
HS2
16
+T°
RT1
J1:1
J1:4
J1:7
J1:10
J2:1
J2:4
J2:10
[-]
12V.3V
3300µF
C10
+12.6V
T1
L1
680µFC5
680µF
C6
22µF
C11
430
R7
2
3 4
1
AC
AC
D7
D15
D17
.047µF
C1
680µFC15
22µF
C8
680µFC17
-225V
+12V
+12V
RED
RED
GRN
GRN/BLK
GRN
PS SM
+485V
J2:7
100V
110V
120V
220V
230V
240V
3300µF
C12
+350V
+480V
47µF
C18
100k
R11
100k
R10
RED/YEL
J6
J7
J8
J9
J10
J11
J12
J13
J14
J15J4
J3
J16
J17
J18
J19
J20
J21
J22
J23
J24
J25
1.0 2 W
R5
.1µF
C4
.1µF
C9
!
FIL B
FIL A
46.4k
R21
30k
R22
430
R4
D8
D14
47µF
C2
22µF
C7
D16
22µF
C14
+700V
2.2k
R8
D9
D10
D11
D12
681
R15
D18
1 23
4
U2
FIL C
3
1
2
Q3
3
1
2
Q2
10K
R16
22.1K
R20
10K
R18
+5V
!
267k
R12
100k
R14
47.5k
R13
BIAS
100k
13
2
CCW
R19
+12.6V
D13
A
B
C
D
E
G
H
I
J
F
JMP1
4.75K
R9
3
1
2
Q1
.6V
D6
0V
PWR RLY
5V
MAIN RELAY
DRIVER
3A
T°
R3
8A
T°
R2
6-32
GP1
.22µF
C16
23
14
K1
MP1
1.0 2W
R6
4.75K
R17
FIL C
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
REFER TO CONNECTION
CHART FOR PROPER
PRIMARYCONNECTIONS
-BIAS ADJUST-
ADJUST R19 FOR -60 TO -62VDC
ACROSS J34 AFTER 5 MINUTES ON
AND NO INPUT SIGNAL

McIntosh C8AC Specifications

General

Brand	McIntosh
Model	C8AC
Category	Amplifier
Language	English