2 0

Two Channel Amplifier Harman Kardon SIGNATURE 1.5

HGF

F G H

EDCBA

A B C D E

JI L MK O

O

P

PL MI J K

1ALL RESISTORS ARE 1/8WUNLESS OTHERWISE SPECIFIED

SET BIAS ACROSSP4-1, P4-2 TO 18 MVBY ADJUSTING R69

1.

2.

NOTES

R951.3K

R981.3K

C35102

R97100

R94100

C34102

R751.0K

R771.0K

Q482SA1376

AGND2

C23476

100V

R120

1K

C38

10V477

CHANNEL 1INPUT

J5RCA/1S

T2

TS

GND2

R119100K

C47271

R11833,2K

GND2

F48A

C14104E

200V

+77VOC.CH2

Q57A06

Q55A06

D16D1N4148

C3310V477

C25

10P500V

MUTE

R10247K

Q532SC2240

Q522SC2240

R99

120

R96

120 R53

33.2K

BAV20D12

R591.5K

GND2

GND2

C19181M500V

Q492SA1376

R7175

P2-1

Q102SC5242

Q112SC5242

Q182SC5242

Q262SC5242

Q272SC5242

Q192SC5242

R27R1W.33

R23R1W.33

R19R1W.33

1

2 4

3

BR2

F28A C6

80V828

C580V828C10

104E200V

P1-2

P1-1

P1-3R5

6.8K2W

-77VDC.CH2

R731.0K

R761.0K

GND2

R721.0K

55833

Q252SA1962

Q242SA1962

Q172SA1962

Q162SA1962

Q82SA1962

Q92SA1962

R22R1W.33

R26R1W.33

R18R1W.33

1 2

RES/IND.2UH2UH

R107RES-5W

1�

s

31

R117750

R103180

GND2

D10D1N4148

C37476

100V

C882880V

R36.8K2W

C780V828

GND2

P3-7+12 VDC

J3 2

TST

3

S1

PHONE JACK3.5MM

R106

10K

R104

100

P3-6

R10510K

STAND BY

THERM SWITCH

GNDP3-2

P3-1

THERSWTH124

DCSENSE

P3-5

P3-3MUTE

R153.3K

+77V.CH2

FAULT

R85

10

C15104

Q3A56

R14

47K

P3-4 FAULTSENSE

D51N4004

-77VDC.CH2

GND2

C32104

100V

R5375

Q342SC3502

R741.0K

Q472SC3478

BAV20D11

R5415K R69

500

R571K

C17100

R565.6K

Q43A56

Q352SC4793

1

2

3

Q402SA1376 1

2

3

1

2

3

R43

100

L32UH

Q332SA1827

R38R1W.33

R34R1W.33

R30R1W.33

P2-2

2

3

1

2

13

R10

100

CH2_OUTPUT

Q362SA1380

R5815K

R81

10

Q412SC3478

R44100

R701.2K R45

100

R39R1W.33

R55R1W.33

R31R1W.33

C11106

R1347K

R12

10K

22222 2

33333 3

11111 1L4

2UH

2

3

1

Q372SC4793

C24104

100V

GND2

FAULT

Q22SC3478

D2D1N4148

D61N4004

+77VDC.CH2

RL2

CHANNEL 2OUTPUT

R11

47KDCSENSE

GND2

R111102W

�R112102W

�

C41104E100V

C46271

CHGNDC45271

BINDPOST

BLK

RED

J2

Signature 1.5 POWER AMPLIFIERSCHEMATIC 1 of 2

Signature 1.5 POWER AMP SCHEMATIC (1 of 2)

2 1

Two Channel Amplifier Harman Kardon SIGNATURE 1.5

Signature 1.5 POWER AMP SCHEMATIC (2 of 2)

HGF

F G H

EDCBA

A B C D E

JI L MK O

O

P

PL MI J K

1

R871.3K

R901.3K

C30102

R89100

R86100

C29102

R661.0K

Q452SA1376

GND1

C20476

100V

ALL RESISTORS ARE 1/8WUNLESS OTHERWISE SPECIFIED

SET BIAS ACROSSP4-1, P4-2 TO 18 MVBY ADJUSTING R60

1.

2.

NOTES

R115

1K

C40

10V477

CHANNEL 1INPUT

J4RCA/1S

T2

TS

GND1R115100K

C44271

R11433,2K

GND1

1

1

2

2

R79

15.8K1/4W

R80

15.8

K1/

4W

GND2

SW

T-2P

2T-H

SLI

DE

4 5 6

1 2 3

S1

CH2_OUTPUT

F38A

C13104E

200V

+77VOC.CH1

Q54A06

R101180

Q56A06

D15D1N4148

GND1

R113750

C2810V477

C22

10P500V

MUTER10047K

Q502SC2240

Q512SC2240

R91

120

R88

120 R52

33.2K

BAV20D9

R521.5K

GND1

C18181M500V

Q462SA1376

R681.0K

R6275

R78

10

Q312SA1380

Q392SC3478

Q322SC4793

R5115K

21

3 L2

2UHR611.2K

GND1R42

100

P4-1

3

1 1 1

2 2

3

2

3 3 3 3

2 2 2

1 1 1

Q232SC5242

Q222SC5242

Q152SC5242

Q142SC5242

Q72SC5242

Q62SC5242

R41100

R37R1W.33

R33R1W.33

R29R1W.33

R25R1W.33

R21R1W.33

R17R1W.33

C12106

R5

10K

R947K

D1D1N4148 Q1

2SC3478

FAULT

GND1

D41N4004

C21104

100V

1

2 4

3

BR1

F18A

C380V828

C280V828

C180V828

C480V828

C9

104E200V

P5-2

P5-1

P5-3

R26.8K2W

R46.8K2W

R1102W

�GND1

CHGND

C36476

100V

-77VDC.CH1

R641.0K

R651.0K

R671.0K

R4675 R84

10

1

3

2

Q382SA1376

Q292SC3502

1

3

2

Q282SA1837

L12UH

R40

100Q30

2SC4793R501K

R60500

C1610650V

BAV20D8

R4715K

GND1

Q442SC3478

R631.0K

R495.6K

R4833

Q42A56

13

2

Q212SA1962

Q202SA1962

Q132SA1962

Q122SA1962

Q42SA1962

Q52SA1962

13

2

P4-2R6

100

R20R1W.33

R24R1W.33

R28R1W.33

R32R1W.33

R36R1W.33

R16R1W.33

+77VDC.CH1

CHANNEL 1OUTPUT

1 2

RL1

RES/IND.2UH2UH

R107RES-5W

1�

R109102W

�R108102W

�

C43271

J1

RED

BLK

BINDPOSTGND1

C42271

CHGNDC39104E100V

R7

47KDCSENSE

-77VDC.CH1

D21N4004

GND1

C27104

100V

D7D1N4148

1

3

S

Signature 1.5 POWER AMPLIFIERSCHEMATIC 2 of 2