McIntosh MC302 Service Manual

MC302
33 34
HEATSINK 751293 SCH 1 OF 2
7
2
2
POS
8/9
NEG
+15V
PG LT
AMP
NEG
SOURCE
NEG
SOURCE
POS
AMP
POS
AMP
VOLTAGE
VOLTAGE
475
R16
DIFFERENTIAL
221
R36
100pF
C17
CURRENT
CURRENT
100pF
C16
3
1
2
Q15
221
R35
DIFFERENTIAL
324
R
41
AMP
10µF
C1
10µF
C2
.1µF
C4
TERMINALMAIN
475
R12
4.99k
R9
267k
R18
267k
R19
1k
R26
3
1
2
Q16
3
1
2
Q19
3
24
R40
3
1
2
Q2
PG DETECTOR
2 1
3
G
D
S
Q5
.0047µF
C7
47.5k
R24
47.5k
R25
221
R3
3
3
1
2
Q9
8
06
R
30
2 1
3
G
D
S
Q6
221
R3
2
3.32k
R
31
.1µF
C3
100
R4
100
R3
3
1
2
Q3
3
1
2
Q12
3
1
2
Q14
3.32k
R34
3
1
2
Q8
8
06
R
29
26
7k
R37
3
1
2
Q11
3
1
2
Q13
B+ B+
B- B-
+14V
-14V
+14V
-14V
FB 2
220µF
C8
475
R10
-15V
2
1pF
C12
5/6
5/6
INP
GND
INPUT
10µF
C15
47 .5 W
R28
-V AMP
B-
47 .5W
R27
10µF
C
14
+V AMP B+
MUTE
2
33.2K
R11
10µF
C9
-14V
3
1
2
Q1
-14V
681K
R13
AMP MUTING
-18V
-18V
2 1
3
Q18
1.5k
R
3
9
B+
D3
D4
3
21
Q17
1.5k
R3
8
B-
D2
D1
PTC
2
470
+T°
RT1
DRV +
DRV -
HS OUT
2.21M
R22
PTC
-15V
+15V
PG LT
MUTE
J3:5
J3:1
J3:3
J3:4
J3:7
J1:3
J1:1
2
1
3
Q20
3
21
Q21
3
1
2
Q22
J2:5
J2:1
8/9
GND
J1:5
5/6
PG ATT
-14V
10k
R6
J2:3
FB 8
2
3
1
84
B+
B-
U1:1
6
5
7
U1:2
3
1
2
Q4
.47µF
C10
2.21K
R17
150K
R15
8/9
FB COM
J1:4
5/6
1M
R14
B-
FB8
FB2
INP
PG ATT
FB COM
1k
R21
2.21k
R20
47uF
C11
3
1
2
Q7
3
1
2
Q10
2.21M
R23
GP1 GP2 GP3
47 .5W
R8
J3:6
2
METER V
22.1k
R1
.001uF
C6
100
R5
.47 x 2
2
1 3
R2
470pF
C5
J1:2
NC
-1.8V
1.8V
PG LIGHT DRIVER
PG MUTE DRIVER
FEEDBACK NETWORK
1000pF
C27
MET V
1000pF
C29
1000pF
C30
47pF
C31
22.1K
R71
22.1K
R70
2.21
R69
430 .5 W
R7
-19.5V
-19.5V
0V
0V
71.8V
71.6V
70.5V
69.9V
70.6V
70V
69.5V
0V
-.5V -.5V
-.6V
-70.4V
-71V
-71.6V
-71.1V
15V
-20V
-20V
0V
0V
-15V
0V
0V 0V
0V
0V
14V
71.6V
71.1V
71.1V
70.5V
.6V
0V
.5V
.5V
69.9V
70V
69.9V
-70.5V
-71.6V
-71.8V
-70.6V
-69.5V

McIntosh MC302 Specifications

General

Damping factor	40
Amplifier class	-
Frequency range	10 - 100000 Hz
RMS rated power	600 W
Audio output channels	2.0 channels
Peak power per channel	300 W
Signal-to-Noise Ratio (SNR)	122 dB
Total Harmonic Distortion (THD)	0.005 %
XLR in	Yes
Speakers connectivity type	Binding post
Product color	Black
Connectivity technology	Wired
Maximum current	6.6 A
AC input voltage	110 V
AC input frequency	50 - 60 Hz

Weight and Dimensions

Depth	558.8 mm
Width	444.5 mm
Height	239.7 mm
Weight	44450 g