McIntosh MC302 Service Manual

35 36
HEATSINK 751293 SCH 2 OF 2
7
3
NEG
POS
3
+ V AMP
LIMITER
CURRENT
ADJUST
J5:1
1
BIAS [+]
- V AMP
J4:1
1µF
C18
1µF
C19
2.21
R42
2.21
R44
.01µF
C23
324
R47
47µF
C21
.01µF
C20
3
1
2
Q23
D5
20K
R49
CURRENT
LIMITER
680
R51
BIAS
.1µF
C24
1
00pF
C25
2
1
3
Q27
2
3
1
Q41
47 .5 W
R56
1
2
3
Q40
3
2
1
Q28:1
3
2
1
Q33:1
3
2
1
Q32:1
J5:2
1.5k
R66
1.5k
R67
BIAS [-]
RECTIFIER
J4:2
3 1
2
Q24
47µF
C22
324
R46
680
R50
20K
R48
D9
1.8k
R55
3
2
1
Q26
3
2
1
Q29:1
680
R54
3
2
1
Q31:1
3
2
1
Q34:1
J6
100pF
C26
430 .5 W
R53
500
13
2
CCW
R52
3
2
1
Q35:1
3
2
1
Q30:1
POS
OUTPUTS
POS
DRIVER
NEG
DRIVER
NEG
OUTPUTS
31
2
Q25
HS OUT 1
NO CONNECTION
TEST ONLY
.47 x 2
2
13
R59
.47 x 2
2
13
R58
.47 x 2
2
13
R60
+V AMP
-V AMP
DRV +
DRV -
HS OUT
5 4
Q34:2
5 4
Q35:2
3
2
1
Q36:1
.47 x 2
2
1
3
R61
.47 x 2
2
1
3
R62
1
J7
HS OUT 2
.47 x 2
2
13
R57
.47 x 2
2
1 3
R65
.47 x 2
2
13
R64
.47 x 2
2
1 3
R63
D6
D7
D8
5
4
Q29:2
5
4
Q31:2
5 4
Q33:2
5
4
Q28:2
5
4
Q30:2
54
Q36:2
3
2
1
Q38:1
54
Q38:2
3
2
1
Q37:1
54
Q37:2
3
2
1
Q39:1
54
Q39:2
2.21
R43
2.21
R45
.6V
.6V
.6V
.6V
.6V
.6V
1.2V
1.8V
-.6V
-.6V
-.6V
-.6V
-.6V
-.6V
-1.2V
-1.8V
WHT
VIO
AUTOFORMER
TRACKING
BIAS
THERMAL
JMP1
680
R68
BIAS ADJUSTMENT
ADJUST R52
FOR 21-25 mVDC
ACROSS J5
WITH NO INPUT SIGNAL
AND HEATSINKS COOL
1.8V
0V
0V
1.8V
1V
.4V
0V
0V
-1.8V

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