How it Works
Kenwood
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KAC-859
Service manual
16 pgs1.68 Mb0
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Kenwood KAC-859 Service manual

POWER AMPLIFIER
KAC-859
SERVICE MANUAL
© 2000-5 PRINTED IN KOREA B51-7626-00 (K) 3547
S
U
B
S
U
B
U
T
P
U
T
PO
W
ER
IN
GND
B
A
T
T
P
.C
N
F
U
S
E
(2
5
Ax2
)
BRIDGED
R
IG
H
T
L
E
F
T
S
P
E
A
K
E
R
S
P
E
A
K
E
R
L
E
V
E
L
IN
P
U
T
R
I
G
H
T
L
E
F
T
SPEAKER LEVEL INPUT
25
25
SELECTOR
INPUT
INPUT SELECTOR
LINE IN
G
N
D
B
.c
h
H
P
F
A
.c
h
H
P
F
FREQUENCY(Hz)
SUB.CH LPF
SENSITIVITY(V)
SUB.CH INPUT
M
O
N
O
(L
c
h
)
STEREO
O
P
E
R
A
T
IO
N
A
B
A
B
A
B
RL
5/4/3 CHANNEL
POWER AMPLIFIER
B SUBA
A
L
R
B SUB
0.3
0.2
(MAX)
0.5
1
2
3
4
(MIN)
5
SENSITIVITY(V)
B.CH INPUT
0.3
0.2
(MAX)
0.5
1
2
3
4
(MIN)
5
SENSITIVITY(V)
A.CH INPUT
0.3
0.2
(MAX)
0.5
1
2
3
4
(MIN)
5
170
200
150
100
80
70
50
BAA
OFF
150Hz
80HzOFF
150Hz
80Hz
SCREW TERMINAL BOARD (E70-0828-05)
(E type only)
(N99-1587-05)
SCREW SET
(W01-1515-05)
TERMINAL COVER SET
(W01-1530-05)
LEAD TERMINAL SET
DRESSING PANEL (A21-4015-02)
HEAT SINK (F01-1629-01)
SCREW TERMINAL BOARD (E70-0829-05)
SCREW TERMINAL BOARD (E70-0821-05)
FUSE
(E52-0014-05)
PIN JACK (E63-0849-05)
(J type only)
DC CORD ASSY (E30-4341-05)
40%
2
-1
11.8V
-1
AB/A
ST/MONO
LEVELLEVEL
-1
50Hz-200Hz
(18dB/oct)
(12dB/oct)
(18dB/oct)
15Hz
LEVEL
120mV 21.9V
SP-P-CON
+LB
-LB
+HB
-HB
320mV
0
10
20
30
40
50
-10
MONO AMP
4ch AMP
ISOLATION & FILTER POWER
dB
INPUT
LEVEL
VOL.
IC1
L
R
SP
SP
HPF
HPF
IC4 (1/4)
IC4 (2/4)
S1-1
S1-2
R
L
(4
40W
)
80,150,OFF
(1/4)
IC5
MUTE
Q101,102
SP
R
L
SP
IC5
(2/4)
S2-2
IC4 (4/4)
HPF
IC2
IC4 (3/4)
HPF
80,150,OFF
S2-1
R
40W
MUTE
Q201,202
(4 )
L
S4
S3
200mV
R
L
(2/4)
(1/4)
IC3
IC3
(3/4)
IC5
(4/4)
IC5
IC3 (3/4)
LPF
IC3 (4/4)
INFRA
MUTE
120W (4 )
SUB
A
B B
A
SUB
FILTER
CONVERTER
DC/DC
BATT
P-CON
T1,T2 Q1-6
Q307
S5
SUB/AB
5 CH AMP. BLOCK DIAGRAM
[ LEVEL DIAGRAM ]
KAC-859
KAC-859

BLOCK DIAGRAM

Q14
4.7k
R16
to P-CON terminal
from SP-P-CON
D8
R44
100k
10u 35
3.3k
Q13
A
Q2
power control
D11
7.5v

CIRCUIT DESCRIPTION

SP P-CON Switching Circuit
When the SP output from the head unit is con-
nected to SP IN, the power can be switched
ON/OFF based on the DC voltage of the SP out-
put.
However, As certain head unit models output DC
permanently or generate a click during switching
OFF, it is required to provide the capability of pre-
vious P-CON switching.
A circuit which can perform the switching without
using a switch is described below.
This circuit performs switching by inhibiting the
operation of the S-P-CON circuit when a voltage
is applied to the P-CON pin.
KAC-859
Circuit operation description When the head unit
is connected to SP-INN, the DC component in the
SP output turns Q2 ON through D8 and R16.
When a voltage is applied to the P-CON pin under
this condition, Q13 is turned ON via R44, positive
feedback is applied by combination of Q13 and
Q14, Q13 and Q14 are held at ON, so the voltage
at point (A) is almost 0V and the SP-P-CON cir-
cuit is not activated.
This circuit holds the ON status while the DC volt-
age from SP is present.
Therefore, in this condition, the P-CON circuit
continues functioning.
To cancel the functioning, the voltage at the SP-IN
pin should go 0V.
3
KAC-859

ADJUSTMENT

No ITEM INPUT SETTINGS OUTPUT SETTINGS
TUNER (RECEIVER)
SETTINGS
ALIGNMENT
POINTS
ALIGN FOR FIG.
Connect a cassette receiver or other receiver.
1
IDLE CURRENT
Connect a DC voltmeter to
CN7/CN8 and J4(SP.OUT,
L+/R-) in X09-5330-10 UNIT
Volume : 0
(A) VR101(Lch) VR102(Rch)
(B) VR201(Lch) VR202(Rch)
After sufficient aging
adjust to 2.0mV
(a)
2
IDLE CURRENT
Connect a DC voltmeter to
CN7 in X08-4080-10 UNIT
Volume : 0
(SUB) VR401
After sufficient aging
adjust to 2.0mV
(a)
BATT.P.CON. GND
(X09-5330-10)
(X08-4080-10)
SPEAKER
OUTPUT
SPEAKER
LEVEL INPUT
FUSE
DC VOLTMETERS
2mV
(a)2mV
(a)2mV
(a)2mV
(a)2mV
(a)2mV
LLR
R
VR102
(A-Rch)
VR202
(B-Rch)
VR101
(A-Lch)
VR401
(IDLE ADJ.)
VR201
(B-Lch)
A-Rch
A-Lch
B-LchB-Rch
CN7
CN7
CN8
B ch
A ch
ADJUSTMENT
4
ACEG IBDFHJ
17
14 8
17
14 8
1
16
1
12
5
6
1
22
5
6
1
2
3
4
5
6
7
14 8
17
14 8
18
16 9
17
14 8
W6
VR1
VR2
VR3
VR4
R139
R140
R125
R105
R106
R101
A
A B
A B
SUB
R102
R2
R205
R206
R325
R44
R201
R202
R301
R302
R128
R142
R156
R158
R154
R152 R162 R150
R145
R149
R247
R245
R255
R257
R256
R258
R253
R254
R252
R262 R250
R251
R261 R249
R246
R248
R259
R341
R343
R345
R347
R346
R348
R344
R342
R238
R260
R349
R352
R241
R243
R242
R244
R161
R151
R153
R157
R155
R141
R143
R147
R334
R333
R332
R331
R329
R335
R327
R328
R326
R330
R8
R40
R11
R12
R29
R34
R32
R39
R21
R22
R15
R35
R27
R26
R18
R19
R20
R17
R16
R25
R410
R411
R404
R407
R401
R405
R406
R417
R419 R418
R416
R36 R37
R13
R42
R41
R14 R23
R43
R24
K1
IDLE SUB
IDEL ADJ.
R6
R47
R4
R5
R7
R146
R148
R336
R339
R228
C218
C118
C136
C130
C127
C133
C129
C227
C237
C330
C327
C328 C329
C333
C332
C331
C225
C233
C135
C235
C236
C230
C229
C234
C228
C226
C125
C137
C134
C128
C324
C321
C323
C320
C325
C326
C335
C216
C4
C5
C6
C24
C17
C21
C26
C403
C19
C16
C138
C126
C124
C123
C223
C115
C116
C315
C316
C319
C104
C2
C224
R132
R126
R131
R127
R129
R133
R134
R130
R136
R138
R312
R313
R160
R159
R350
R351
R144
R314
R315
R238
R236
R230
R234
R233
R229
C217
C219
C220
C120
C119
C117
C122
C309
C12
C132
C322
C11
C25
C131
C231
C232
C7
C310
C222
C113
C13
C8
C215
C9
C14
C114
C211
C209
C205
C1
C112
C110
C106
C111
C109
C105
C101
C102
C201
C202
C103
C204
C302
C3
C15
C10
C318
C317
C314
C305
C306
C313
C312
C307
C308
C303
C301
C206
C210
C212
C214
C27
C203
C311
R227
R231
R232
R239
R240
R107
R109
R111
R117
R113
R115
R119
R120
R116
R114
R118
R112
R110
R104
R108
R1
R207
R203
R209
R211
R217
R213
R215
C213
R219
R221
R223
R224
R220
R45
R216
R214
R218
R212
R210
R204
R208
R322
R323
R324
R307
R311
R308
R309
R310
R319
R317
R316
R318
R320
R321
R305
R303
R304
R306
R3
C23
C22
C18
C20
C406
C405
C404
C402
C401
R30
R38
R413
R403
R402
R415
R414
R412
R409
R408
R46
VR401
R31
R28
R33
R222
R124
R122
R121
R123
R225
R226
R103
W14
W46
W47
W60
W76
W94
W154
W117
W131
W143
W77
W57
W56
W73
W74
W59
W69
W64
W93 W78
W91
W81
W103 W104
W105 W106
W92 W79
W45 W98
W132 W133
W134 W135
W150
W151
W158
W159
W96
W97
W56
W113
W80
W90
W89
W95
W29
W70
W169
W122
W123
W138
W43
W136
W144
TH1
W128
W5
W18
W16
W35
W44
W19W20
W15
W13
W11
W9
W3
W12
W10
W4
W1
W7
W8
W23
W30
W36
W72
W82
W83
W84
W86
W61
W85
W119
W120
W121
W110
W115
W114
W124
W126
W116
W129
W130
W140
W155
W156
W157
W141
W99
W102
W109
W111
W125
W137
W55
W48
W62
W52
W54
W63
W53
W51
W42
W38
W37
W32
W31
W34
W170
W75
W147
W153
W152
W146W148
W142
W160
W163
W166
W162
W165
W167
W161
W164
W168
W112
W33
W66
W68
W87
W88
W49W50
W40
W41
W17
W27
W28
W21
W22
W24
W65
W67
W71
W39
W25W26
W2
EB
EB
EB
EB
EB
EB
EB
EB
EB
EB
EB
BE
EB
EB
EB
EB
EB
BE
EB
EB
EB
EB
EB EB
EB
EB
EB
EB
EB
BE
BE
BE
BE
BE BE
EB EBBE
BE
BE
BE
BE
BE
BE
BE B
1
2
7
8
1
2
7
8
1
2
7
8
E
BE
BE
C334
IC4
A.CH
INPUT
A.CH
HPF
B.CH
HPF
SENSITIVITY
B.CH
INPUT
SENSITIVITY
SUB.CH
INPUT
SENSITIVITY
SUB.CH
LPF
FREQUENCY
OPERATION
INPUT
SELECTOR
INPUT
SELECTOR
LINE IN
A
B
SUB
IC1
IC2
IC3
CN6
CN5
CN4
CN7
IC6
J1
S1
S2
S4
S3
S5
D107
D105
D103
D101
Q104
Q103
Q209
Q105
Q206
Q208
Q210
Q302
Q301
Q303
Q304
Q13
Q14
Q5
Q2
Q4
Q3
Q12
Q403
Q402
Q405
Q1
Q10
Q9
Q7
Q6
Q404
Q401
Q408
Q406
Q8
Q11
Q409
Q407
D305
D109
D209 D210
D2
D4
D6
D8
D9
D13
D15
D10
D12
D7
D1
D3
Q106
Q107
Q203
Q109
Q205
Q207
Q204
Q101
Q201
Q202
Q307
Q110
Q108
Q102
D110
D108
D106
D104
D102
D207
D205
D203
D201
D208
D304
D303
D302
D301
D206
D204
D5
D11
D17
D402
D16
D18
D401
D14
D202
IC5
X08-4080-10 A/2 (J74-1031-11)
PREAMPLIFIER UNIT

X08 B/2

E3
E4
E2
E1
Ref.No. Address Ref.No. Address
IC1 3C Q108 2E
IC2 4C Q109 2F
IC3 6C Q110 2E
IC4 2C Q201 2G
IC5 2D Q202 2G
IC6 6E Q203 2F
Q1 6D Q204 2G
Q2 6D Q205 2F
Q3 6D Q206 2G
Q4 6D Q207 2G
Q5 6D Q208 2G
Q6 6E Q209 2G
Q7 6E Q210 2G
Q8 6E Q301 3E
Q9 6E Q302 3E
Q10 6E Q303 3E
Q11 6E Q304 4E
Q12 7F Q307 3E
Q13 6D Q401 6I
Q14 6D Q402 6H
Q101 2F Q403 6H
Q102 2E Q404 6H
Q103 2F Q405 6H
Q104 2E Q406 6I
Q105 2F Q407 6G
Q106 2E Q408 5I
Q107 2F Q409 6F
PC BOARD (Component side view)
1
2
3
4
5
6
7
Refer to the schematic diagram for the value of resistors and capacitors.
5
6
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