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Two Channel Amplifier Harman Kardon SIGNATURE 1.5
Signature 1.5 POWER AMP SCHEMATIC (1 of 2)
A B C D E F G H I J K L M O P
NOTES
1. ALL RESISTORS ARE 1/8W Signature 1.5 POWER AMPLIFIER
1 UNLESS OTHERWISE SPECIFIED
SCHEMATIC 1 of 2
2. SET BIAS ACROSS R81
P4-1, P4-2 TO 18 MV +77VDC.CH2
BY ADJUSTING R69 C23 10
476 R77 R71
100V R98 C35 R95 C34 R75 75 C24
1.3K 102 102 1.0K 1.0K 104 D6
1.3K 100V 1N4004
AGND2 Q36
CHANNEL 1 R97 R94 Q48 2SA Q41
2SC GND2
INPUT 2SA1376 1380
100 100 3478
J5 FAULT
RCA/1S Q49
C38 BAV20 2SA1376 2 Q37
T2 R120 D12 2SC
1
4793 Q27 Q26 Q19 Q18 Q11 Q10
10V 1K 2SC5242 2SC5242 2SC5242 2SC5242 2SC5242 2SC5242
3
TS D2
1
s C19
2
2
2
2
2
2
477 3 L4
Q53 Q52 181M 1 1 1 1 1 1 D1N4148 Q2
2SC2240 2SC2240 500V R58 2SC
GND2 15K 2UH
R70 3478
3
3
3
3
3
3
R118 R59 P2-1 R12
C47 1.2K R45
R119 33,2K R99 R96 1.5K GND2 RL2
271 10K
100K GND2 100 C11 R13 RES/IND.2UH
120 120 R53 106 47K 2UH
R39 R55 R31 R27 R23 R19
MUTE 33.2K R44 R1W R1W R1W R1W
GND2 100 R1W R1W 1 2
.33 .33 .33 .33 .33 .33 CHANNEL 2
R102 C25 R107 OUTPUT
47K RES-5W
D16 10P 1W
500V J2
D1N4148 R56 Q43 C46
C33 R72 558 A56 R38 R34 R30 R26 R18
Q55 1.0K 5.6K 33 R22 R111 R112 271 RED
10V R1W R1W R1W R1W R1W R1W 10W 10W
A06 477 .33 .33 .33
C17 .33 .33 .33 2W 2W
2
Q57 100 Q35 P2-2 CHGND
A06 R117 1 R43 BLK
2SC R10 C41 C45
750 BAV20 104E
4793 100 Q25 Q24 Q17 Q8 Q9 271
D11 R57 3 Q16 100 100V BINDPOST
1K L3 2SA1962 3 2SA1962 2SA1962 3 2SA1962 2SA1962 2SA1962
GND2
+77VOC.CH2 R103 2UH 1 1 GND2
180
R54 3
C14 15K R69 Q33 2 2
104E Q47 500 1 2SA
2SC Q40 1827
GND2 2SA1376 1 R11
200V 3478 2
F4 3 CH2_OUTPUT DCSENSE
8A 1 3 C7 R3 C8 C37 47K
80V 6.8K 828 476
P1-2 828 2W 100V 2
BR2 80V D10 Q34
D1N4148 2SC3502
P1-1 F2
8A C5 GND2
C6 R5
P1-3 2 4 80V 6.8K 80V R74 R73 R76 D5
C10 828 2W 828 1.0K 1.0K R53
1.0K 75 1N4004
R85
104E -77VDC.CH2
200V 10 C32
104
-77VDC.CH2 100V GND2
P3-7
+12 VDC P3-5
J3 R106 P3-6 P3-1
2 THERM SWITCH DCSENSE
T +77V.CH2
S1 TS
10K STAND BY THERSW R15 C15
TH124 3.3K 104
PHONE JACK R105 P3-3 FAULT Q3
3
3.5MM R104 10K P3-2
GND MUTE A56
100
R14 P3-4 FAULT
SENSE
47K
A B C D E F G H I J K L M O P
20
Two Channel Amplifier Harman Kardon SIGNATURE 1.5
Signature 1.5 POWER AMP SCHEMATIC (2 of 2)
A B C D E F G H I J K L M O P
1
NOTES Signature 1.5 POWER AMPLIFIER
1. ALL RESISTORS ARE 1/8W SCHEMATIC 2 of 2
UNLESS OTHERWISE SPECIFIED
2. SET BIAS ACROSS
P4-1, P4-2 TO 18 MV
BY ADJUSTING R60 R78
+77VDC.CH1
C20 10
R62
476 R90 C30 R87 C29 R66 R68 75 C21
100V 1.3K 102 1.3K 102 1.0K 1.0K 104 D4
100V 1N4004
GND1 Q31 Q39
CHANNEL 1 R89 R86 Q45 2SA 2SC
GND1
2SA1376 1380
INPUT 100 100 3478
J4 FAULT
RCA/1S BAV20 Q46
C40 R115 2SA1376 2 Q32
T2 D9 2SC
1
10V 4793 Q23 Q22 Q15 Q14 Q7 Q6
1K
3
TS 2SC5242 2 2SC5242 2 2SC5242 2 2SC5242 2 2SC5242 2 2SC5242 2
1
S 477 Q50 C18 3 L2 D1
Q51 181M 1 1 1 1 1 1
2SC2240 2SC2240 D1N4148 Q1
R115 500V R51 2SC
GND1 100K 15K 2UH
R61 3 3 3 3 3 3 3478
R5
SWT-2P2T-HSLIDE
C44 R114 R52 1.2K R42
R91 R88 1.5K P4-1 RL1
1 S1 4
5
6
271 33,2K GND1 10K
100 C12
120 120 GND1 106 RES/IND.2UH
R52 R9 2UH
47K
2
3
GND1 R41 R37 R33 R29 R25 R21 R17
33.2K 100 R1W R1W R1W R1W R1W R1W 1 2
GND2 MUTE .33 .33 .33 .33 .33 .33 CHANNEL 1
R107
1 R79 2 R100 C22 RES-5W OUTPUT
47K
15.8K 10P
1/4W D15 1W J1
1 R80 2
D1N4148 500V Q42
R49 C43
15.8K
R63
1/4W
C28 5.6K R48 A56 R36 R32 R28 R24 R16 R20 R108 R109 271
Q54 10V 1.0K 33 R1W R1W R1W R1W R1W R1W RED
A06 10W 10W
477 C16 .33 .33 .33 .33 .33 .33 2W 2W
Q56 106
50V R40 P4-2 CHGND
A06 R113 R6 C39 BLK
750 BAV20 Q30 104E C42
CH2_OUTPUT 100 271
D8 2SC4793 Q21 Q20 Q13 Q12 Q4 Q5 100 100V BINDPOST
R50 2SA1962 3 2SA1962 2SA1962 3 2SA1962 2SA1962 2SA1962
GND1 1K L1 GND1
+77VOC.CH1 R101 2UH 1 1
180
C13 R47 3 Q28
15K R60 2 2
104E Q44 1 2SA
500 1837
2SC GND1 Q38
3478 2SA1376 1 2 R7
200V DCSENSE
F3 3
8A 1 3 C3 R2 C4 C36 47K
80V 6.8K 80V 476
P5-2 828 100V 2
BR1 828 2W D7
D1N4148 Q29
P5-1 F1 2SC3502
8A C2 R1 GND1
P5-3 2 4 80V R4 C1
6.8K 80V 10W R65 R64
C9 828 2W R67 R46 D2
2W 828 1.0K 1.0K 1.0K 1N4004
75 R84
104E CHGND
200V -77VDC.CH1
10 C27
-77VDC.CH1 104
100V GND1
A B C D E F G H I J K L M O P
21