Signature 1.5 Power Amp Schematic (2 Of 2) - Harman Kardon Signature 1.5 Technical Manual

Two Channel Amplifier
A B C
1
NOTES
1.
ALL RESISTORS ARE 1/8W
UNLESS OTHERWISE SPECIFIED
2.
SET BIAS ACROSS
P4-1, P4-2 TO 18 MV
BY ADJUSTING R60
C20
476 C30
R90
100V 102
1.3K
GND1
CHANNEL 1
R89
INPUT 100
J4
RCA/1S
C40
R115
T2
10V
1K
TS
477
S Q51
2SC2240
R115
GND1
100K
R114
C44
R91
33,2K
271
120
GND1
GND2 MUTE
R79
1
2
15.8K
1/4W
D1N4148
Q54
A06
CH2_OUTPUT
R101
+77VOC.CH1
180
C13
104E
200V
F3
C4
R2
8A 1 3 C3
80V
80V 6.8K
P5-2
828
2W
828
BR1
P5-1
F1
8A
C2
R4 C1
P5-3
2 4 80V
6.8K 80V
828
C9
2W 828
104E
200V
-77VDC.CH1
A B C

Signature 1.5 POWER AMP SCHEMATIC (2 of 2)

D E F G
R62
R68
R87 C29 R66
75
1.3K 1.0K
102 1.0K
Q31
Q45 2SA
R86
1380
2SA1376
100
Q46
BAV20
2SA1376
D9
C18
Q50
181M
2SC2240
500V
R52
1.5K
R88
GND1
120
R52
33.2K
R100 C22
47K
10P
D15
500V
R63 R49
C28
5.6K
1.0K
10V
477
C16
106
Q56
50V
A06 R113
750 BAV20
D8
R50
GND1
1K
R47
R60
15K
Q44
500
2SC
GND1
3478
C36
476
100V
D7
Q29
D1N4148
2SC3502
GND1
R1
10 W
R65
R64
R67
2W R46
1.0K 1.0K
1.0K
75
CHGND
D E F G
Harman Kardon
H I J
Signature 1.5 POWER AMPLIFIER
SCHEMATIC 2 of 2
R78
10
Q39
2SC
3478
2
Q32
1 2SC
Q23 Q22 Q15
4793
2 2
2SC5242 2SC5242 2 2SC5242 2SC5242
3
L2
1
1 1
R51
2UH
15K
R61 3 3 3
1.2K R42
P4-1
GND1
100
R33 R29
R41 R37
R1W R1W
100 R1W
.33 .33
.33
Q42
R48 R36 R32 R28
A56
33
R1W R1W R1W
.33 .33 .33
P4-2
R40
Q30
100
Q21 Q20 Q13
2SC4793
2SA1962 2SA1962 2SA1962 2SA1962
3 3
L1
2UH
1 1
3
Q28
2
2
1
2SA
Q38 1837
1
2SA1376 2
3
2
R84
10
H I J
K L M
C21
104
100V
GND1
FAULT
Q14 Q6
Q7
2 2 2
2SC5242 2SC5242
D1
1 1 1
D1N4148 Q1
2SC
3478
3 3 3
R5
10K
C12
106 R9
47K
R25 R21 R17
R1W R1W
R1W
.33 .33 .33
R24
R16 R20
R1W R1W R1W
.33 .33 .33
R6
Q12
Q4 Q5
100
2SA1962 2SA1962
C27
104
100V
GND1
K L M
SIGNATURE 1.5
O P
+77VDC.CH1
D4
1N4004
RL1
RES/IND.2UH
2UH
1
2
CHANNEL 1
R107
OUTPUT
RES-5W
1W
J1
C43
R109
R108
271
W RED
10 W 10
2W
2W
CHGND
C39
BLK
C42
104E
271
100V
BINDPOST
GND1
R7
DCSENSE
47K
D2
1N4004
-77VDC.CH1
O P
2 1