Kenwood KAC-819 Service Manual page 4

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A
B
(X09-5260-10) (A/4)
1
(X09- ) (B/4)
RCA INPUT
J1
E1
CN1
R1
C3
R5
R8
1K
10u50
27K
1K
Lch
1
1
+
R16 1K
2
2
C11 1000P
3
3
R2
C4
R6
1K
10u50
27K
Rch
4
4
+
(X09- ) (C/4)
2
-15.5V
SPEAKER
LEVEL INPUT
J2
E2
CN2
C9
2.2u50
R23
R+
1
1
1
+
51K
C7
2.2u50
R21
R-
2
2
2
+
51K
C10
2.2u50
R22
L-
3
3
3
+
51K
C8
2.2u50
R24
L+
4
4
4
+
51K
R157
2.2K
3
Q26
CLASS A INITIAL
STAGE CONSTANT-
CURRENT CIRCUIT
AVR
R117
Q17
10
R119
10
Q19
Q26
4
D21
R174
R172
10
Q24
Q24,
ERRONEOUS
30K
25
Q21-23
CONNECTION
PROTECTION CIRCUIT
MUTING
AGAINST
CIRCUIT
0.075V
R70 1K 1/2W
Q2
0.01V
R68 47K
R69 4.7K
C31
0.65V
10u50
C35 15P
C36 270P
+
C33
R64
Q1
0.01
100
Q21
43.5V
R185
-43.0V
150K
43.0V
R184
75K
Q1,2
-5.0V
CLASS A INPUT
5
Q23
DIFFERENTIAL
AMPLIFIER
-2.1V
R179
Q22
47K
-43.0V
Q3
AVR
-43.5V
R118
R112
Q18
10
2K
D5
R114
Q20
R120
2K
10
R116
22K
Q3,4
6
CLASS A TWO-STAGE
DIFFERENTIAL
AMPLIFIER
CAUTION: For continued safety, replace safety critical components only with
manufacturer's recommended parts (refer to parts list).
Indicates safety critical components. To reduce the risk of electric shock,
leakage-current or resistance measurements shall be carried out (exposed
parts are acceptably insulated from the supply circuit) before the appliance
7
is returned to the customer.
C
D
15.5V
VR1
5K(A)
INPUT
LPF
SENSITIVITY
FREQUENCY
0V
VR2
IC1
50K(C)
IC1
0V
(1/4)
0V
4
R13
R25
(2/4)
3
R29
R30
1
R11
150
2.2K
5
2
7
7.5K
12K
0V
6
5.6K
R14
R26
R9 10K
150
2.2K
0V
R28
30K
IC1
INPUT BUFFER
ISOLATE LPF
INFRASONIC FILTER
Q15,16
Q7-10
Q11-14
CURRENT
CLASS B
CLASS B
R111
LIMITER
INITIAL STAGE
FINAL
2K
R113
2K
0.57V
0.54V
C75
R115
1u50
Q12
R80
R87
+
10(NB)
4.7(NB)
22K
R171
R79
Q25
Q8
R81
R85
Q11
100K
100(NB)
10(NB)
4.7(NB)
Q7
0.57V
0.54V
0.12V
Q15
D7
R103
1K
R104
CLASS A
D8
1K
CURRENT
MIRROR
-0.13V
D16
Q5
CIRCUIT
1.1V
-0.53V
-0.75V
Q6
-0.6V
-0.56V
-1.1V
R83
R86
Q13
R78
Q9
10(NB)
4.7(NB)
100(NB)
R82
R88
Q14
Q10
10(NB)
4.7(NB)
-0.6V
-0.56V
Q4
C37
220u50
+
Q6
TEMPERATURE
COMPENSATION
45.0V
R168
33K
E
F
C15 0.047
R41
5.6K
IC1
IC1
0V
0V
(4/4)
(3/4)
13
R36
C16
C17
C18
C19
9
14
R31
R32
R33
8
10
10u50
1u50
1u50
1u50
12
150K
120K
6.8K
10
+
+
+
+
11
0V
R107
Q28
Q27
D14
10K
D15
45.0V
Q27,28
CN3
ERRONEOUS
1 2
CONNECTION
RELAY
PROTECTION CIRCUIT
DRIVE
Q33-36
AGAINST
R194
1K
L2
D25
Q44
K1
0V
D26
IC4
PROTECTION
IC
0V
-45.0V
R166
10K
Q41
Q41
FINAL Tr. OVERCURRENT
DETECTION CONTROL
•DC voltages are as measured with a high impedance voltmeter.
Values may vary slightly due to variations between individual
in struments or/and units.
G
H
IC2
C22
R45
(2/2)
8
22u50
4.3K
0V
5
7
0V
+
0V
6
IC2
0V
(1/2)
0V
C24 100P
C20
R44
C23
10u50
0V
2
1
300
2.2u50
R51 4.3K
+
3
+
C21
4
0V
0.22
S1
S2
BASS BOOST
OFF-6-12
-15.5V
INFRASONIC
OFF-15-25
R108
D18
10K
D19
DC/DC CONVERTER
CONTROL IC
R142
10K
IC3
Q29-32
DC/DC CONVERTER
DC/DC CONVERTER
0V
1
NI.IN
SWITCHING FET
DRIVE
C57
NI.IN
10u50
3.0V
2
Q32
I.IN
14.4V
R138 150
+
3
R.OUT
FB
0.2V
R136
4
CONT.
DT
D28
22
VCC
C58
1000P
1.7V
5
Q36
Q34
Q30
CT
R144
3.7V
6
RT
0V
16K
7
GND
Q29
14.4V
R139 150
13.5V
8
C1
R137
D27
22
Q35
Q33
Q31
Q37
P-CON INPUT
OVERCURRENT
PROTECTION
14.4V
14.3V
R159
Q39
L1
6.2K
R155
10K
DISPLAY
R152
LED DRIVE
3.3K
Q38
Q40
D29
0.4V
22K
R158
22K
D32
4.7K
D30
R162
180K
Q37
R227
10K
2
1
Q46
CN5
(X09- ) (D/4)
WH1
2 1
D34
D101
Q45
I
J
IC1
: UPC4574C
IC2
: NJM4565D
IC3
: UPC494C
IC4
:
UPC1237HA
15.5V
Q1,2,16,25,26,41
:
2SA992(F,E)
Q3,4
: 2SC2631(Q,R)
Q5
: 2SA1123(Q,R)
Q6
: 2SC4137(V,W)
Q7,8
: 2SC2235
Q9,10
: 2SA965
Q11,12
: 2SC5101LB∗5
Q13,14
: 2SA1909LB∗5
Q15,24,27,28
: 2SC1845(F,E)
Q17,19
: 2SC1627A
Q18,20,39,44
: 2SA817A
Q21,22,29,32,37,38,45
: 2SC945(A) (Q,P)
Q23,30,31,46
: 2SA733(A) (Q,P)
Q33-36
: IRFIZ48NLF24
Q40
: DTA124ESA
D1-4,6-23,27,28,32-34,
37,38,40
: 1SS131
D24
: RD20JS(B)
D25
: FML22S∗A
D26
: FML22R∗A
D29
: RD7.5JS(B)
D31
: IN5406-M
D35,36
: RD16JS(B2)
D100
: B30-1613-05
SIGNAL LINE
GND LINE
B LINE
B LINE
J5
SIGMA
1
SERVO+
2SA1123
2
SP+
2SA733(A)
2SA817A
2SA965
2SA992
3
SP-
2SC1627A
SIGMA
4
SERVO-
2SC1845
2SC2235
2SC2631
0V
16
2SC945(A)
5.0V
15
I.IN
5.0V
14
5.0V
13
13.5V
12
13.5V
11
C2
5.0V
10
B
E2
5.0V
9
C
DTA124ESA
E1
E
UPC494C
9
E
C
B
8
16
2SC4137
FUSE
1
J3
1
+B
2
GND
CN4
UPC4574C
8
R151
J4
3.3K
P-CON
7
14
Q38,39
B
P-CON
C
CONTROL
E
1
NJM4565D
UPC1237HA
5
8
4
KAC-819
8
1
1
KAC-819

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