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Kenwood Manuals
Amplifier
HM-901
Service manual
Kenwood HM-901 Service Manual page 12
Stereo integrated amplifier/tuner
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AE
AF
(X09-470X-XX) (A/4)
(X09- ) (B/4)
J1
SUPER
WOOFER
1
PRE OUT
R1
L 1
28
1K
CD IN
R2
R 2
3
1K
J2
R5
L 1
2
27
1K
AUX IN
R6
R 2
4
1K
R9
L 3
21
1K
REC
R10
R 4
10
1K
TAPE
3
J3
1
2
3
4
R13
CN2
L 1
26
1K
PLAY
R14
R 2
5
1K
R17
L 3
20
1K
REC
R18
R 4
11
1K
4
MD
R21
L 5
23
1K
PLAY
R22
R 6
8
1K
E3
-12V
DET
15
14
SLEVEL
14
13
5
SD
13
12
X05-
STEREO
12
11
CN1
IC1
Rch
11
INPUT
1/3
SEL.
GND
10
Lch
9
WH2
11.5V
A
+12V
8
+12V
IC1
-12V
7
-12V
T.MUTE
6
10
PLL DATA
5
6
PLL CLK
4
7
PLL CE
3
8
PLL DO
2
9
NC
1
6
-12.2V
7
AG
AH
R127 820
4.5V
D32
C19 1
R126
+12V
68
R128
1/4W
100K
R144
1
IC3
4.3V
4.6V
4.8V
IC3
ELECTRIC VOL.
4.6V
TONE CONT.
C20 1
+5.6V
+5.6V
11.0V
R98
R145 16K
IC5(2/2)
C129
100
10u50
C134
2
8
6
D3
10u35
-
1
-
7
+
3
5
+
+
+
IC5(1/2)
4
LEVEL
-11.7V
AMP
-12V
5
6
7
8
9
10
CN1
10
9
8
7
6
5
4
3
2
1
SW
11.5V
+12V
+12V
IC2(1/2)
C13
10u25
C17
5
8
10u25
(
+
7
+
6
-
+
R81
REC OUT
33
BUFFER
R82
33
C18
2
C14
-
1
10u25
10u25
3
+
+
+
4
(
-12.2V
IC2(2/2)
-12V
R55
(
10
)
1K
R56
(
9
)
1K
C122
Q35
470P
15
-12V
-12V
AI
AJ
22.4V
IC4(1/2)
C21
C23
4.7u50
R33
2.2u50
R45
3
8
+
1
+
2.2K
+
1K
2
C132
0.7V
-
R49
1000P
Q1
R35
R37
2.2K
1K
3..3K
4.5V
Q3
-2.1V
-6dB
MUTE
ATT.
Q2
R36
R38
2.2K
1K
Q4
4.8V
-2.1V
0.7V
R50
3..3K
6
C22
C24
-
7
4.7u50
R34
2.2u50
R46
5
+
-0.5V
+
+
2.2K
1K
4
IC4(2/2)
MUTE
ATT-
DRIVE
DRIVE
R139
4
R84
1K
390
Q38
R140
-22.4V
3
Q37
1K
4.7V
2.8V
+12V
Lch
IDLE
T.P
CN3
CN9
1
2
3
4
5
6
7
8
9
10
11 12 13
1
2
Q5-8
FINAL TR.
PH1,4
CONT.
Q13
R167
1K
20
)
10.0V
0V
PH1
IDLE
R59
ADJ.(L)
VR1
180
R61 240
100
R57
62
PH2,3
CONT.
6.8V
PH3
R168
Q14
1K
21
)
0.7V
0.3V
DC DETECTOR
L
23.3V
PH2
Q11
Q12
0V
R58
62
R62 240
VR2
100
R60
IDLE
ADJ.(R)
180
R
PH4
PROTECTION
R159
22.6V
1K
+27.5V
0V
+12V
-12V
+5.6V
AK
AL
+24V
+24V
+24V
K1
OFF:AB CLASS
R89
ON :B CLASS
7.5K
K1
-0.4V
R77
100
R51
10
R90
3.3K
7.5K
A CLASS
AMP
23.3V
K1
ON/OFF
R91
Q36
R52
0V
7.5K
9
3.3K
R78
100
R92
7.5K
-24V
-24V
R93
100K
R94
100K
1
2
3
4
5
6
7
8
9
10
11
12
13
CN4
Rch
IDLE
T.P
CN10
1
2
23.8V
+28.9V
Q5
3
K3
1.2V
1
PHONES
ON/OFF
4
0V
Q5
2
+27.2V
5
0.5V
0V
Q7
D7
C33 1000P
0V
R65 5.1K
+
Q7
K3
1
Q33
22.6V
0V
0V
Q9
0.3V
4
2
Q9
5
CURRENT
DETECTOR
-1.2V
3
-24.1V
-29.2V
Q8
3
Q10
4
CURRENT
DETECTOR
22.6V
5
2
0V
Q10
0V
+
1
R66 5.1K
-1.2V
C34 1000P
0V
Q8
Q6
5
2
4
Q6
0.5V
0V
1
1.2V
23.8V
3
+28.9V
+27.5V
+12V
-12V
-12V
-28.7V
+5.6V
AM
AN
24V AVR
22.4V
23.3V
Q15
IC1
:
NJU7313AM
IC2
:
NJM4565L-D
IC3
:
M62420SP
IC4
:
M5219P
23.1V
IC5
:
NJM4565D
5
-23.1V
Q16
-24V AVR
R147
4
1K
-22.4V
-24.1V
-28.7V
CN5
+27.5V
1
2
3
4
5
6
K2
SP.
ON/OFF
+27.2V
L
D6
Q34
K2
0.8V
R
-29.2V
+28.9V
+27.5V
12V AVR
Q43
11.5V
R169
3.3
22.9V
1/4W
12.7V
C116
R114
1000P
22K
Q45
11.0V
Q42
30
0V
Q46
-0.6V
R104 300
-12.8V
-12.2V
-24.0V
R170
2.2
Q44
-12V AVR
1/4W
-28.7V
+5.6V
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