Harman Kardon SIGNATURE 1.5 (serv.man5) Service Manual ▷ View online
2 0
Two Channel Amplifier
Harman Kardon
SIGNATURE 1.5
H
G
F
F
G
H
E
D
C
B
A
A
B
C
D
E
J
I
L
M
K
O
O
P
P
L
M
I
J
K
1
ALL RESISTORS ARE 1/8W
UNLESS OTHERWISE SPECIFIED
SET BIAS ACROSS
SET BIAS ACROSS
P4-1, P4-2 TO 18 MV
BY ADJUSTING R69
1.
2.
NOTES
R95
1.3K
R98
1.3K
C35
102
R97
100
R94
100
C34
102
R75
1.0K
R77
1.0K
Q48
2SA1376
AGND2
C23
476
100V
R120
1K
C38
10V
477
CHANNEL 1
INPUT
J5
RCA/1S
T2
TS
GND2
R119
100K
C47
271
R118
33,2K
GND2
F4
8A
C14
104E
200V
+77VOC.CH2
Q57
A06
Q55
A06
D16
D1N4148
C33
10V
477
C25
10P
500V
MUTE
R102
47K
Q53
2SC2240
Q52
2SC2240
R99
120
R96
120
R53
33.2K
BAV20
D12
R59
1.5K
GND2
GND2
C19
181M
500V
Q49
2SA1376
R71
75
P2-1
Q10
2SC5242
Q11
2SC5242
Q18
2SC5242
Q26
2SC5242
Q27
2SC5242
Q19
2SC5242
R27
R1W
.33
R23
R1W
.33
R19
R1W
.33
1
2
4
3
BR2
F2
8A
C6
80V
828
C5
80V
828
C10
104E
200V
P1-2
P1-1
P1-3
R5
6.8K
2W
-77VDC.CH2
R73
1.0K
R76
1.0K
GND2
R72
1.0K
558
33
Q25
2SA1962
Q24
2SA1962
Q17
2SA1962
Q16
2SA1962
Q8
2SA1962
Q9
2SA1962
R22
R1W
.33
R26
R1W
.33
R18
R1W
.33
1
2
RES/IND.2UH
2UH
R107
RES-5W
1
W
s
3
1
R117
750
R103
180
GND2
D10
D1N4148
C37
476
100V
C8
828
80V
R3
6.8K
2W
C7
80V
828
GND2
P3-7 +12 VDC
J3
2
TS
T
3
S1
PHONE JACK
3.5MM
R106
10K
R104
100
P3-6
R105
10K
STAND BY
THERM SWITCH
GND
P3-2
P3-1
THERSW
TH124
DCSENSE
P3-5
P3-3
MUTE
R15
3.3K
+77V.CH2
FAULT
R85
10
C15
104
Q3
A56
R14
47K
47K
P3-4
FAULT
SENSE
D5
1N4004
-77VDC.CH2
GND2
C32
104
100V
R53
75
Q34
2SC3502
R74
1.0K
Q47
2SC
3478
BAV20
D11
R54
15K
R69
500
R57
1K
C17
100
R56
5.6K
Q43
A56
Q35
2SC
4793
1
2
3
Q40
2SA1376
1
2
3
1
2
3
R43
100
L3
2UH
Q33
2SA
1827
R38
R1W
.33
R34
R1W
.33
R30
R1W
.33
P2-2
2
3
1
2
1
3
R10
100
CH2_OUTPUT
Q36
2SA
1380
R58
15K
R81
10
Q41
2SC
3478
R44
100
R70
1.2K
R45
100
R39
R1W
.33
R55
R1W
.33
R31
R1W
.33
C11
106
R13
47K
R12
10K
10K
2
2
2
2
2
2
3
3
3
3
3
3
1
1
1
1
1
1
L4
2UH
2
3
1
Q37
2SC
4793
C24
104
100V
GND2
FAULT
Q2
2SC
3478
D2
D1N4148
D6
1N4004
+77VDC.CH2
RL2
CHANNEL 2
OUTPUT
R11
47K
47K
DCSENSE
GND2
R111
10
2W
W
R112
10
2W
W
C41
104E
100V
C46
271
CHGND
C45
271
BINDPOST
BLK
RED
J2
Signature 1.5 POWER AMPLIFIER
SCHEMATIC 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)
H
G
F
F
G
H
E
D
C
B
A
A
B
C
D
E
J
I
L
M
K
O
O
P
P
L
M
I
J
K
1
R87
1.3K
R90
1.3K
C30
102
R89
100
R86
100
C29
102
R66
1.0K
Q45
2SA1376
GND1
C20
476
100V
ALL RESISTORS ARE 1/8W
UNLESS OTHERWISE SPECIFIED
SET BIAS ACROSS
SET BIAS ACROSS
P4-1, P4-2 TO 18 MV
BY ADJUSTING R60
1.
2.
NOTES
R115
1K
C40
10V
477
CHANNEL 1
INPUT
J4
RCA/1S
T2
TS
GND1
R115
100K
C44
271
R114
33,2K
GND1
1
1
2
2
R79
15.8K
1/4W
R80
15.8K 1/4W
GND2
SWT
-2P2T
-HSLIDE
4 5 6
1 2 3
S1
CH2_OUTPUT
F3
8A
C13
104E
200V
+77VOC.CH1
Q54
A06
R101
180
Q56
A06
D15
D1N4148
GND1
R113
750
C28
10V
477
C22
10P
500V
MUTE
R100
47K
Q50
2SC2240
Q51
2SC2240
R91
120
R88
120
R52
33.2K
BAV20
D9
R52
1.5K
GND1
C18
181M
500V
Q46
2SA1376
R68
1.0K
R62
75
R78
10
Q31
2SA
1380
Q39
2SC
3478
Q32
2SC
4793
R51
15K
2
1
3
L2
2UH
R61
1.2K
GND1
R42
100
P4-1
3
1
1
1
2
2
3
2
3
3
3
3
2
2
2
1
1
1
Q23
2SC5242
Q22
2SC5242
Q15
2SC5242
Q14
2SC5242
Q7
2SC5242
Q6
2SC5242
R41
100
R37
R1W
.33
R33
R1W
.33
R29
R1W
.33
R25
R1W
.33
R21
R1W
.33
R17
R1W
.33
C12
106
R5
10K
R9
47K
D1
D1N4148 Q1
2SC
3478
FAULT
GND1
D4
1N4004
C21
104
100V
1
2
4
3
BR1
F1
8A
C3
80V
828
C2
80V
828
C1
80V
828
C4
80V
828
C9
104E
200V
P5-2
P5-1
P5-3
R2
6.8K
2W
R4
6.8K
2W
R1
10
2W
W
GND1
CHGND
C36
476
100V
-77VDC.CH1
R64
1.0K
R65
1.0K
R67
1.0K
R46
75
R84
10
1
3
2
Q38
2SA1376
Q29
2SC3502
1
3
2
Q28
2SA
1837
L1
2UH
R40
100
Q30
2SC4793
R50
1K
R60
500
C16
106
50V
BAV20
D8
R47
15K
GND1
GND1
Q44
2SC
3478
R63
1.0K
R49
5.6K
R48
33
Q42
A56
1
3
2
Q21
2SA1962
Q20
2SA1962
Q13
2SA1962
Q12
2SA1962
Q4
2SA1962
Q5
2SA1962
1
3
2
P4-2
R6
100
R20
R1W
.33
R24
R1W
.33
R28
R1W
.33
R32
R1W
.33
R36
R1W
.33
R16
R1W
.33
+77VDC.CH1
CHANNEL 1
OUTPUT
1
2
RL1
RES/IND.2UH
2UH
R107
RES-5W
1
W
R109
10
2W
W
R108
10
2W
W
C43
271
J1
RED
BLK
BINDPOST
GND1
C42
271
CHGND
C39
104E
100V
R7
47K
DCSENSE
-77VDC.CH1
D2
1N4004
GND1
C27
104
100V
D7
D1N4148
1
3
S
Signature 1.5 POWER AMPLIFIER
SCHEMATIC 2 of 2
2 1
Two Channel Amplifier
Harman Kardon
SIGNATURE 1.5
Signature 1.5 POWER AMP SCHEMATIC (2 of 2)
H
G
F
F
G
H
E
D
C
B
A
A
B
C
D
E
J
I
L
M
K
O
O
P
P
L
M
I
J
K
1
R87
1.3K
R90
1.3K
C30
102
R89
100
R86
100
C29
102
R66
1.0K
Q45
2SA1376
GND1
C20
476
100V
ALL RESISTORS ARE 1/8W
UNLESS OTHERWISE SPECIFIED
SET BIAS ACROSS
SET BIAS ACROSS
P4-1, P4-2 TO 18 MV
BY ADJUSTING R60
1.
2.
NOTES
R115
1K
C40
10V
477
CHANNEL 1
INPUT
J4
RCA/1S
T2
TS
GND1
R115
100K
C44
271
R114
33,2K
GND1
1
1
2
2
R79
15.8K
1/4W
R80
15.8K 1/4W
GND2
SWT
-2P2T
-HSLIDE
4 5 6
1 2 3
S1
CH2_OUTPUT
F3
8A
C13
104E
200V
+77VOC.CH1
Q54
A06
R101
180
Q56
A06
D15
D1N4148
GND1
R113
750
C28
10V
477
C22
10P
500V
MUTE
R100
47K
Q50
2SC2240
Q51
2SC2240
R91
120
R88
120
R52
33.2K
BAV20
D9
R52
1.5K
GND1
C18
181M
500V
Q46
2SA1376
R68
1.0K
R62
75
R78
10
Q31
2SA
1380
Q39
2SC
3478
Q32
2SC
4793
R51
15K
2
1
3
L2
2UH
R61
1.2K
GND1
R42
100
P4-1
3
1
1
1
2
2
3
2
3
3
3
3
2
2
2
1
1
1
Q23
2SC5242
Q22
2SC5242
Q15
2SC5242
Q14
2SC5242
Q7
2SC5242
Q6
2SC5242
R41
100
R37
R1W
.33
R33
R1W
.33
R29
R1W
.33
R25
R1W
.33
R21
R1W
.33
R17
R1W
.33
C12
106
R5
10K
R9
47K
D1
D1N4148 Q1
2SC
3478
FAULT
GND1
D4
1N4004
C21
104
100V
1
2
4
3
BR1
F1
8A
C3
80V
828
C2
80V
828
C1
80V
828
C4
80V
828
C9
104E
200V
P5-2
P5-1
P5-3
R2
6.8K
2W
R4
6.8K
2W
R1
10
2W
W
GND1
CHGND
C36
476
100V
-77VDC.CH1
R64
1.0K
R65
1.0K
R67
1.0K
R46
75
R84
10
1
3
2
Q38
2SA1376
Q29
2SC3502
1
3
2
Q28
2SA
1837
L1
2UH
R40
100
Q30
2SC4793
R50
1K
R60
500
C16
106
50V
BAV20
D8
R47
15K
GND1
GND1
Q44
2SC
3478
R63
1.0K
R49
5.6K
R48
33
Q42
A56
1
3
2
Q21
2SA1962
Q20
2SA1962
Q13
2SA1962
Q12
2SA1962
Q4
2SA1962
Q5
2SA1962
1
3
2
P4-2
R6
100
R20
R1W
.33
R24
R1W
.33
R28
R1W
.33
R32
R1W
.33
R36
R1W
.33
R16
R1W
.33
+77VDC.CH1
CHANNEL 1
OUTPUT
1
2
RL1
RES/IND.2UH
2UH
R107
RES-5W
1
W
R109
10
2W
W
R108
10
2W
W
C43
271
J1
RED
BLK
BINDPOST
GND1
C42
271
CHGND
C39
104E
100V
R7
47K
DCSENSE
-77VDC.CH1
D2
1N4004
GND1
C27
104
100V
D7
D1N4148
1
3
S
Signature 1.5 POWER AMPLIFIER
SCHEMATIC 2 of 2
2 1
Two Channel Amplifier
Harman Kardon
SIGNATURE 1.5
Signature 1.5 POWER AMP SCHEMATIC (2 of 2)
H
G
F
F
G
H
E
D
C
B
A
A
B
C
D
E
J
I
L
M
K
O
O
P
P
L
M
I
J
K
1
R87
1.3K
R90
1.3K
C30
102
R89
100
R86
100
C29
102
R66
1.0K
Q45
2SA1376
GND1
C20
476
100V
ALL RESISTORS ARE 1/8W
UNLESS OTHERWISE SPECIFIED
SET BIAS ACROSS
SET BIAS ACROSS
P4-1, P4-2 TO 18 MV
BY ADJUSTING R60
1.
2.
NOTES
R115
1K
C40
10V
477
CHANNEL 1
INPUT
J4
RCA/1S
T2
TS
GND1
R115
100K
C44
271
R114
33,2K
GND1
1
1
2
2
R79
15.8K
1/4W
R80
15.8K 1/4W
GND2
SWT
-2P2T
-HSLIDE
4 5 6
1 2 3
S1
CH2_OUTPUT
F3
8A
C13
104E
200V
+77VOC.CH1
Q54
A06
R101
180
Q56
A06
D15
D1N4148
GND1
R113
750
C28
10V
477
C22
10P
500V
MUTE
R100
47K
Q50
2SC2240
Q51
2SC2240
R91
120
R88
120
R52
33.2K
BAV20
D9
R52
1.5K
GND1
C18
181M
500V
Q46
2SA1376
R68
1.0K
R62
75
R78
10
Q31
2SA
1380
Q39
2SC
3478
Q32
2SC
4793
R51
15K
2
1
3
L2
2UH
R61
1.2K
GND1
R42
100
P4-1
3
1
1
1
2
2
3
2
3
3
3
3
2
2
2
1
1
1
Q23
2SC5242
Q22
2SC5242
Q15
2SC5242
Q14
2SC5242
Q7
2SC5242
Q6
2SC5242
R41
100
R37
R1W
.33
R33
R1W
.33
R29
R1W
.33
R25
R1W
.33
R21
R1W
.33
R17
R1W
.33
C12
106
R5
10K
R9
47K
D1
D1N4148 Q1
2SC
3478
FAULT
GND1
D4
1N4004
C21
104
100V
1
2
4
3
BR1
F1
8A
C3
80V
828
C2
80V
828
C1
80V
828
C4
80V
828
C9
104E
200V
P5-2
P5-1
P5-3
R2
6.8K
2W
R4
6.8K
2W
R1
10
2W
W
GND1
CHGND
C36
476
100V
-77VDC.CH1
R64
1.0K
R65
1.0K
R67
1.0K
R46
75
R84
10
1
3
2
Q38
2SA1376
Q29
2SC3502
1
3
2
Q28
2SA
1837
L1
2UH
R40
100
Q30
2SC4793
R50
1K
R60
500
C16
106
50V
BAV20
D8
R47
15K
GND1
GND1
Q44
2SC
3478
R63
1.0K
R49
5.6K
R48
33
Q42
A56
1
3
2
Q21
2SA1962
Q20
2SA1962
Q13
2SA1962
Q12
2SA1962
Q4
2SA1962
Q5
2SA1962
1
3
2
P4-2
R6
100
R20
R1W
.33
R24
R1W
.33
R28
R1W
.33
R32
R1W
.33
R36
R1W
.33
R16
R1W
.33
+77VDC.CH1
CHANNEL 1
OUTPUT
1
2
RL1
RES/IND.2UH
2UH
R107
RES-5W
1
W
R109
10
2W
W
R108
10
2W
W
C43
271
J1
RED
BLK
BINDPOST
GND1
C42
271
CHGND
C39
104E
100V
R7
47K
DCSENSE
-77VDC.CH1
D2
1N4004
GND1
C27
104
100V
D7
D1N4148
1
3
S
Signature 1.5 POWER AMPLIFIER
SCHEMATIC 2 of 2
