KENWOOD KAC-7252 Service Manual

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Service Manual for KENWOOD KAC-7252, downloadable as a PDF file.

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© 2005-3 PRINTED IN JAPAN
B53-0248-00 (N) 1708
POWER AMPLIFIER
KAC-7202/7252
SERVICE MANUAL
REMOTE CONTROL
Stereo Bridgeable
Powe
Amplifie
65
75
85
95
10
0
50
17
2
15
11
9
18
40
FR
EQ
U
EN
C
Y
L
EV
EL
[d
B]
[H
z]
Accessories
(W01-1606-05)
KAC-7252
(E type,M type)
Dressing Panel
(A21-4463-02)
: KAC-7252
(A21-4525-02)
: KAC-7202
Screw set
(N99-1759-05)
Screw set
(N99-1766-05)
Connecting cord assy
(E30-6145-05)
Modular cable
(E30-6240-15)
Mouting hardware
(J22-0301-14)
Remote control
CONTROL SYSTEM
KAC-7202
KAC-7202
KAC-7252 (K type)
Dressing Panel
(A21-4467-02)
: KAC-7252(K type)
(A21-4468-02)
: KAC-7202
(A21-4526-02)
: KAC-7252(E type),
KAC-7252(M type)
Except KAC-7202
6m
19cm
Fuse (40A)
(F52-0016-05)
Except KAC-7202
This product uses Lead Free solder.
background image
© 2005-3 PRINTED IN JAPAN
B53-0248-00 (N) 1708
POWER AMPLIFIER
KAC-7202/7252
SERVICE MANUAL
REMOTE CONTROL
Stereo Bridgeable
Powe
Amplifie
65
75
85
95
10
0
50
17
2
15
11
9
18
40
FR
EQ
U
EN
C
Y
L
EV
EL
[d
B]
[H
z]
Accessories
(W01-1606-05)
KAC-7252
(E type,M type)
Dressing Panel
(A21-4463-02)
: KAC-7252
(A21-4525-02)
: KAC-7202
Screw set
(N99-1759-05)
Screw set
(N99-1766-05)
Connecting cord assy
(E30-6145-05)
Modular cable
(E30-6240-15)
Mouting hardware
(J22-0301-14)
Remote control
CONTROL SYSTEM
KAC-7202
KAC-7202
KAC-7252 (K type)
Dressing Panel
(A21-4467-02)
: KAC-7252(K type)
(A21-4468-02)
: KAC-7202
(A21-4526-02)
: KAC-7252(E type),
KAC-7252(M type)
Except KAC-7202
6m
19cm
Fuse (40A)
(F52-0016-05)
Except KAC-7202
This product uses Lead Free solder.
background image
KAC-7202/7252
2
BLOCK DIAGRAM
50-200Hz
HPF
SENS
L
LINE IN
ISO AMP
IC12,16
IC1(X08)
LINE OUT
L
40-100Hz
BASS
BOOST
MUTE
Q201-258
POWER AMP
IC7-9,13,15
Q241,242
MO/ST
LINE OUT
R
LINE IN
R
MUTE
BOOST
50-200Hz
40-100Hz
HPF
BASS
SP IN
L
SP IN
R
CONTROL
f, GAIN
REMOTE
CONTROL
D.D. CON.
AVR
GAIN=0-18dB
f=40-100Hz
SP OUT L
SP OUT R
P-CON
BATT
GND
15V
LPF
50-200Hz
IC1
LPF/OFF/HPF
IC3(X08)
COMPONENTS DESCRIPTION
ADJUSTMENT
No.
ITEM
ALIGNMENT POINT
METHOD
ALIGN FOR
NOTE
IDLE
VR1 (Lch)
Connect a DC voltmeter
After Power on
1
CURRENT
VR2 (Rch)
between check land
2.5mV
5 minutes
(Refer to PC BOARD)
PREAMPLIFIER UNIT (X08-4190-1x)
Ref. No.
Application / Function
IC1
HPF
IC2
Phase reversal amplifier (Lch only)
IC3
LPF
IC4~6
Bass-boost circuit
IC7
Bass-boost mixing amplifier
AUDIO UNIT (X09-5830-1x)
Ref. No.
Application / Function
IC1,12,16
Input isolation amplifier
IC5
DC/DC converter
IC6
Temperature detection comparator
IC7,8
For adjusting bass-boost f
IC9
For adjusting bass-boost gain
IC13
Bass-boost phase shifter
IC15
Bass-boost mixing amplifier
Q1,2
±15V AVR
Q3~8
DC/DC converter FET
Q9~12
DC/DC converter FET driver
Q13,14
For controlling DC/DC converter FET driver
Ref. No.
Application / Function
Q101
Remote controller reference voltage
Q201~204
Power amplifier initial step differential driving
Q209,210
Current limiter
Q205~208
Power amplifier second step differential driving
Q211,213
Temperature detection for idling
Q220,222~227,229
Power amplifier final
Q241,242
Power amplifier mute
Q251~258
Power amplifier driver
Q280,282
Power amplifier ATT (-3dB)
Q601,615~618
Power-ON shock preventer circuit
Q602
P-Con OFF detection
Q603
Mute drive
Q604,605
P-Con control circuit
Q606
Excess voltage detection
Q607,608,619,620
Temperature detection control circuit
Q609
Fan power supply
Q610
Excess current detection
Q611,612
DC detection
Q613,614
DC detection for latch
Q621,622
For LED control
Q623
Temperature detection control circuit
background image
KAC-7202/7252
3
E
D
C
B
A
1
2
3
4
5
6
7
R603
R604
R601
R623
R624
W277
C57
C53
W276
W53
W54
W51
W62
W52
C113
W55
W58
C51
C112
C602
C152
C153
C155
C156
W274
R104
R109
R110
R111
R123
R124
R126
R163
C103
C104
C105
C106
C154
C157
R105
R106
R107
R108
R121
R122
R128
R152
R153
R154
R155
R156
R157
R158
R159
R160
R161
R162
C59
C58
C60
R131
R132
C117
C118
C109
C115
C110
C116
W151
W152
R133
R134
R135
R136
R139
R140
R146
R145
R143
R144
R148
R147
R129
R130
R137
R141
R142
R138
W61
W56
W57
W59
W60
W275
W257
W251
W264
W266
W273
W265
W256
W254
W263
W259
W260
W267
W258
W253
W262
W255
W252
W261
W268
W269
W270
W271
W272
41
8
5
1
4
58
58
1
4
41
58
41
58
85
14
41
58
W204
W203
W30
W36
W32
W5
VR62
3
1
3
13
4
2
C604
1
3
C603
W4
1
2
W8
W6
W14
W10
W25
W19
W26
W201
W202
0dB
VR102
BASS
BOOST
18dB
W31
C107
VR61
1
W1
C124
W2
C123
W3
C54
W21
W7
C158
W11
LO
W
P
ASS
W24
W22
W16
W15
HI PASS
VR152
14 6 3 5 2
VR101
W12
INPUT SENS
W20
W18
W9
C108
W17
W13
C52
W23
5
6
14
VR4
32
5
6
14
3
2
W28
W27
W29
W210
W207
W212
W34
W33
1
10
5
6
50Hz
W206
W205
200Hz
W209
W211
W208
200Hz
50Hz
W39
W35
1
4
3
6
W38
HPF
200
V
5V
OFF
LPF
MONO
W37
W40
ST
11
3
14
VR1-L
ISO-L
RCA-G
ISO-R
BB-L
-15V
BB-R
LOGO-LED
FAN+B
D-GND
+15V
VR1-R
ISO-GND-1
ISO-GND-2
1
TP164
TP11
TP12
TP7
TP9
TP5
TP1
TP2
TP3
TP8
TP10
TP13
TP14
TP15
TP105
TP106
TP107
TP113
TP114
TP115
TP116
TP117
TP118
TP119
TP121
TP126
TP127
TP152
TP153
TP154
TP155
TP156
TP157
TP158
TP159
TP160
TP161
TP162
TP163
TP63
TP64
TP62
TP61
TP60
TP65
43
65
2
D614
CN3
CN1
J1
FREQUENCY
BOOST
LEVEL
S6
S1
CN8
IC1
IC2
IC3
IC4
IC5
IC6
IC7
X08 B/2
PREAMPLIFIER UNIT X08-4190-1x A/2 (J76-0069-12)
X08-4190-1x
Ref. No.
Address
IC1
4C
IC2
4B
IC3
4B
IC4
2B
IC5
2B
IC6
2A
IC7
3A
PC BOARD (FOIL SIDE VIEW)
Refer to the schematic diagram for the values of resistors and capacitors.
background image
KAC-7202/7252
4
F
G
H
I
J
1
2
3
4
5
6
7
4
1
2
9
10
1
3
2
4
37
5
6
2
1
1
21
4
13
C2
C143
C3
C142
C611
C612
R406
C108
C109
C137
C110
R111
C4
C5
C156
C129
C130
C131
C601
C161
C203
C204
C207
C208
C263
C264
C132
C602
C603
C604
C605
C608
C225
C226
R6
R179
R203
R204
C104
C105
C117
C118
C123
C124
C125
C126
C135
C136
C144
C145
C149
C150
C151
C152
C201
C202
C209
C210
C212
C21
C214
C215
C216
C217
C218
C606
R1
R2
R3
R4
R29
R101
R102
R107
R108
R122
R123
R124
R125
R126
R127
R169
R171
R173
R174
R175
R177
R202
R211
R212
R213
R214
R220
R222
R233
R234
R235
R236
R243
R246
R247
R248
R257
R258
R261
R262
R271
R272
R342
R343
R344
R608
R616
R619
C155
C7
W19
C223
C261
R178
W32
W148
W145
W130
W33
W47
W58
W46
W50
W52
W59
W68
W138
W24
W25
W57
W56
W65
W114
W26
W31
W28
W29
W35
W36
W45
W49
W30
W96
W42
W43
W38
W150
W161
W151
W41
W3
W39
W104
W123
W102
W78
W79
W120
W107
W126
W110
W135
W132
W67
W144
W115
W72
W139
W40
W44
W71
W131
W146
W127
W73
W142
W147
W136
W133
W75
W143
W82
W54
W129
W149
W99
W101
W51
W53
W83
W1
W17
W55
W69
W27
W159
W137
W157
W125
W6
W113
R184
R185
R186
R187
W70
W109
W98
W103
W134
W124
W88
W89
W90
W85
W80
W121
W87
W154
W152
W100
W86
W158
W112
W116
W119
W118
W111
W108
W97
W95
W155
W156
W105
W94
W81
W92
W77
W128
W48
W61
W66
W122
W64
W60
W63
W62
W74
W84
W93
W91
W141
W76
W160
W140
W153
C618
C20
VR1
VR2
W610
W611
W614
C170
W370
C120
R119
C103
W376 W373
R104
R114
C115
R103
R118 R112
R109
C119
W378
R130
W380
W382
W379
C167
R128
W381
R168
R113
C116
R110
R115
W386
R131
R167
W501
R162
R129
W372
C141
R164
R152
W383
TH602
R163
C140
R161
W502
R151
R135
R658
R606
W368
R617
C609
R634
R626
R629
R635 R622
R156 R176
R148
R153
R154
C610
W336
W320
W324
R660
R632
W335
R139
R143
R664
R659
C616
R661
R667
W339
C134
R150
C133
W366
R149
W334
C128
R137
R668
R142
R136
R134
C127
W361
W338
R138
R264
R280
R287
W369
R260
W352
W390
W385
R240
C220
R230
R290
C222
R232
W371
TH202
W327
W328
W329
R201
R285
C206
C228
C205
C227
R289
R249
R207
W3
W31
W357
C219
R625
R229
R120
C102
C101
C157
C111
W389
R105
R116
R117
C113
W388
C114
W387
R121
C165
R181
C121
C158
C122
C112
W392
R106
C139
R158
R160
R166
C138
R157
R159
R165
R141
W346
R630
W333
C147
C148
C153
R146
W358
W349
C146
R145
W337
W340
R603
R604
W326
R627
R633
C168
R147
C166
C169
R170
W321
C607
R631
W322
R614
R609
R605
R613
R607
W319
R602
R610
R611
R612
R615
R666
R662
R663
R665
W332
W363
W343
W325
R133
W323
W331
R140
R132
R620
R621
W351
W364
W347
W345
W330
W350
W377
R216
R206
R224
R208
W356
R218
W315
W312
R238
W375
R228
W393
W362
W353
R624
W384
R226
R639
R638
R636
W348
W374
W342
R250
R209
R265
R266
R282
R284
W367
R227
R241
R242
R210
R263
R637
C221
TH201
R231
R205
R225
W391
R239
R251
W359
W344
17
8
14
17
8
14
17
8
14
14
5
8
14
5
8
14
5
8
14
5
8
1
4
58
EB
E
B
E
B
BE
BE
BE
B
E
BE
EB
EB
EB
EB
EB
EB
EB
EB
EB
E
B
E
B
E
B
E
B
E
B
B
E
E
B
B
E
E
B
E
B
EB
B
E
B
E
B
E
B
E
B
E
B
E
E
B
B
E
BE
B
E
B
E
BE
B
E
BE
BE
B
E
BE
B
E
BE
BE
BE
B
E
B
E
B
E
B
E
B
E
B
E
Q604
Q609
D615
Q611
Q612
Q613
D152
D203
D204
D205
D206
D261
D601
D602
D603
D605
D613
Q201
Q202
Q203
Q204
Q206
Q20
Q208
Q210
Q
Q216
Q217
Q218
Q251
Q252
Q253
Q254
Q255
Q256
Q257
Q258
Q601
Q610
D108
D612
Q607
D610
Q1
Q2
J1
J2
J4
Q211
Q213
Q220
Q222
Q225
Q226
Q229
CN1
Q224
D106
D102
D107
Q101
Q621
D614
Q606
Q605
Q618
D109
Q242
Q282
D229
D295
Q280
Q241
D253
D103
D104
D105
D101
Q619
Q622
D608
Q602
Q617
Q614
D604
D606
Q603
D607
Q623
Q615 Q616
D4
D254
D3
D255
IC16
IC12
IC1
IC15
IC8
IC13
IC9
IC7
AUDIO UNIT X09-5830-1x A/2 (J76-0073-11)
LINE
OUT
LINE
IN
SPEAKER
LEVEL
INPUT
REMOTE
SPE
DC
L
Lch
DC
v
o
ltmeter
Rc
h
Rch
2.5mV
Refer to the schematic diagram for the values of resistors and capacitors.
PC BOARD (FOIL SIDE VIEW)
background image
KAC-7202/7252
5
O
N
M
L
K
1
2
3
4
5
6
7
13
C16
C1
C8
C9
C17
C615
R5
R6
C13
C15
C211
C213
C215
C217
C18
R7
R8
R28
R29
R155
R172
R219
R221
R235
R245
R341
R30
W602
W601
C6
L1
L2
W32
W22
W33
W26
W31
W28
W29
W30
W2
W1
W12
W13
W14
W15
W16
W102
W4
W9
W8
W7
W11
W10
W20
W18
W21
W117
W106
W37
W27
W23
C19
W5
C617
C20
W606
W607
W609
W603
C10
C11
L3
W608
R643
R647
W354
R646
R657
R651
R648
R21
W308
R26
R17
R18
R13
R12
R14
R11
R618
R649
R642
R207
W318
W317
C219
R229
R614
W314
R652
R653
C614
R650
W355
R656
W302
R19
R27
W304
R23
R22
W305
C14
R24
R20
R25
W301
W313
R623
W310
R16
W307
W306
W303
R15
W309
W311
R9
R205
R223
R239
R251
R215
R217
TH601
R10
TH605
R237
C613
85
4
1
16
9
8
1
BE
E
B
EB
EB
E
B
E
B
B
E
EB
S
GD
S
GD
S
GD
S
GD
S
GD
S
GD
BE
B
E
BE
B
E
BE
BE
BE
D9
D7
D8
D203
D251
D260
D616
Q205
Q207
Q209
Q215
Q3
Q4
Q5
Q6
Q7
Q8
Q608
D611
J3
D1
D2
P1
1
Q223
Q227
WH1
D5
D6
06
Q12
Q9
Q14
Q13
D10
Q10
Q620
D609
D617
Q11
IC6
IC5
X09 B/2
SPEAKER OUTPUT
POWER IN
DC voltmeter
Lch 2.5mV
X09-5830-1x
Ref. No.
Address
IC1
6H
IC5
6N
IC6
5K
IC7
5I
IC8
5I
IC9
5H
IC12
6G
IC13
5H
IC15
5H
IC16
6G
Q1
2H
Q2
2H
Q3
4N
Q4
3N
Q5
4N
Q6
3N
Q7
5N
Q8
4N
Q9
5N
Q10
5N
Q11
5N
Q12
5N
Q13
5N
Q14
5N
Q101
6I
Q201
3H
Q202
3H
Q203
3I
Q204
3H
Q205
3K
Q206
4G
Q207
3K
Q208
4H
Q209
3K
Q210
4G
Q211
2J
Q213
3G
Q215
2K
Q216
4G
Q217
3I
Q218
2G
Q220
4G
Q222
3G
Q223
2K
Q224
4G
Q225
2I
Q226
2G
Q227
2L
Q229
2J
Q241
4H
Q242
4H
Q251
2I
Q252
3F
Q253
2I
Q254
3F
Q255
2I
Q256
4G
Q257
2I
Q258
4G
Q280
4H
Q282
4H
Q601
6J
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