© 2005-5 PRINTED IN JAPAN
B53-0286-00 (N) 1708
POWER AMPLIFIER
KAC-6202
SERVICE MANUAL
This product uses Lead Free solder.
Accessory
(W01-1607-05)
190mm
Screw set
(N99-1587-05)
Fuse
(F52-0014-05)
Connecting cord assy
(E30-6145-05)
Stereo/Bridgeable
Powe Amplifie
Stereo/Bridgeable
Powe Amplifie
MAXIMUMPOWER
KAC-6202 (E type,M type)
KAC-6202 (K type)
KAC-6202
2
BLOCK DIAGRAM
COMPONENTS DESCRIPTION
Rch
IN
Lch
LINE
Rch
Lch
HPF
LPF(+6dB)
LPF(+6dB)
HPF
MUTE
AMP
ISOLATION
+6dB
P. AMP
+6dB
PHASE
ST/MONO
SW
SW
HPF/OFF/LPF
INPUT
OUTPUT
6dB
6dB
-27
0dB(LPF:+6dB)
26dB
INVERT
L
R
RCA
IN
SPEAKER
X09-590
AUDIO UNIT (X09-5900-10)
Ref. No.
Application / Function
Operation / Condition / Compatibility
IC1
Buffer amplifier
+6dB, low-impedance conversion
IC2
Isolation amplifier
Common mode noise filtering
IC3
Buffer amplifier
+6dB,Rch reversal
IC4
Reversal buffer amplifier
+6dB, reversal amplifier
IC5,6
HPF/LPF
Fitter with variable cutoff
IC7
DC/DC converter
Oscillation and control of DC/DC converter
Q1,2
Switching
Transistor for ON/OFF control of latter step driver
Q3~6
Drive transistor
FET driver for the latter steps
Q7,8
Switching FET
Switching FET for the secondary power supply
Q201,202
For muting
Transistor for muting B-class step
Q203~206
Differential amplifying transistor
Transistor for first step differentiation amplification
Q207~210
Differential amplifying transistor
Transistor for second step differentiation amplification
Q211,212
Current mirror load
Current mirror load of second step differentiation
Q213,214
Temperature compensating transistor
For prevention of thermal-runaway of the final transistor
Q215~218
Over current protection
Transistor protection against excess current
Q219~222
Power amplification
First step of Darlington power amplification
Q223~226
Power amplification
Second step of Darlington power amplification
Q501,502
Constant voltage stabilization
Transistor for constant voltage stabilization
Q601,602
Switching
Transistor for mute ON/OFF control for B-class step
Q603,604
Switching
Transistor for mute control for B-class step
Q605
Switching
Transistor for DC protection circuit latch
Q606
Switching
For DC protection latch ON control
Q607,608
Drive transistor
For DC protection circuit driving
KAC-6202
3
COMPONENTS DESCRIPTION
ADJUSTMENT
No.
Item
Alignment point
Method
Align for
Note
1
IDLE
VR3 (Lch)
Connect a DC voltmeter
2.5mV
After Power on
CURRENT
VR4 (Rch)
between emitter resister
5 minutes
R278
R277
Q225
Q223
VR3
Lch
Q226
Q224
Rch
VR4
MIN
MAX
MIN
MAX
DC voltmeter
Lch 2.5mV
DC voltmeter
Rch 2.5mV
Ref. No.
Application / Function
Operation / Condition / Compatibility
Q609
Switching
For PULL-DOWN of DC/DC converter 2 pin
Q610~614
Switching
Transistor for power supply circuit ON/OFF control
Q615
Switching
Transistor for mute ON/OFF control for latter steps
D1
Circuit protection diode
For circuit protection at reverse connection of power supply cord
D4~7
Switching
Backflow prevention diode
D8,9
Rectifying diode
Rectification on the secondary power supply side
D101~103
Static protection diode
For circuit protection against static
D201
Switching
Backflow prevention diode
D202,203
Operation stabilizer diode
Contains thermal fluctuation of transistor Vbe of second step differentiation
D204,205
Current mirror load
Current mirror circuit load
D206~211
Switching
Backflow prevention diode
D501
Indicator LED
Indicator for behavior visual check
D601
Bias diode
Backflow prevention diode
D602,606
Switching
Backflow prevention diode
D603
Level shifter
For DC protection circuit bias
D604
Switching
For turning operation off at P-CON momentary power down
D605
Switching
For turning off operation at BATT excess voltage and for circuit protection
D607
Level shifter
For bias of the mute control circuit
D608~612
Switching
Backflow prevention diode
KAC-6202
4
A
B
C
D
E
1
2
3
4
5
6
7
PC BOARD (FOIL SIDE VIEW)
Refer to the schematic diagram for the values of
resistors and capacitors.
IC7
AUDIO UNIT
X09-5900-10
(J76-0088-11)
C602
C604
R7
R9
R11
R14
R15
R22
R23
R26
R612
R615
R624
R626
R630
C9
R1
R2
R3
R4
R6
R8 R10
R18
R19
R20
R21
16
9
18
R266
R268
R270
R272
R274
R279
R280
R284
R611
R613
R614
R623
R625
R627
R628
R629
R631
R632
R636
TH1
W407
W403
W408
W404
W402
W405
W401
W406
W418
W422
W417
W419
W420
W397
W398
W400
C613
W410
W409
W421
W411
W413
W415
W414
W416
W395
W207
C1
W152
R634
R638
C2
C5
C6
C7
C8
C10
C11
C603
W209
C607
C608
C609
C239
C240
12
3
4
5
6
7
L3
R281
R282
L1
C3
C4
C12
C236
C238
C606
R24
R25
R275
R278
R285
R287
R621
R622
R633
W187
W186
W185
W171
W197
W198
W183
W200
W174
W173
W179
W184
W167
W161
W201
W178
W177
W181
W180
W182
W168
W208
W172
W206
W145
W150
W151
W159
W160
W163
W162
W165
W158
W164
W156
W157
W166
W176
W175
W170
W169
W146
W148
W196
W192
W195
W190
W188
W189
W191
W193
W194
W153
W155
W
W154
W205
W199
W202
W203
W204
W149
SD
G
S
D
G
B
E
E
B
EB
B
EB
E
B
E
BE
BE
BE
BE
BE
BE
B
E
B
E
BE
B
E
BE
B
E
B
E
BE
BE
BATT-F
BATT
GND
P-CON
GND
-B
+B
THERMAL
THERMAL
R-OUT
GND
GND
L-OUT
GND
GND
Q3
Q6
D603
D604
Q4
Q5
Q606
Q607
Q608
Q611
Q612
Q613
D605
D7
D211
D607
Q1
Q2
Q605
Q609
Q614
D1
Q610
D5
J3
Q7
Q8
D4
D6
D8
D9
D209
D602
D606
D608
D609
D610
P1
Q216
Q218
Q222
Q615
Q226
Q223
X09-5900-10
Ref. No. Address
IC1
3I
IC2
3H
IC3
4I
IC4
4I
IC5
5H
IC6
5I
IC7
3E
Q1
2D
Ref. No. Address
Q2
2D
Q3
3D
Q4
3D
Q5
2D
Q6
2D
Q7
2C
Q8
2B
Q201
4H
KAC-6202
5
J
I
H
G
F
1
2
3
4
5
6
7
IC1
IC2
IC3
IC4
IC5
IC6
C107
C203
C212
W375
W351
W333
R238
R239
R617
C108
C204
C211
R616
C121
C122
C221
C222
C245
R117
R118
R121
R125
R126
R138
R201
R222
R223
R224
R225
R226
R227
R234
R235
R236
R237
R601
R607
R608
R609
R292
C119
C120
C105
C106
C109
C110
C118
C101
C102
C207
C208
C209
C210
C223
C224
C227
C228
C229
C230
C242
C243
C244
C901
C902
R103
R104
R105
R106
R107
R108
R109
R110
R111
1
4
8
5
1
4
8
5
1
4
8
5
1
85
14
85
14
4
8
5
R112
R113
R114
R119
R120
R127
R128
R129
R130
R610
R202
R203
R204
R205
R206
R207
R208
R209
R210
R211
R212
R213
R214
R215
R216
R217
R218
R219
R220
R221
R228
R229
R230
R231
R232
R233
R240
R241
R242
R243
R244
R245
R246
R247
R248
R249
R250
R251
R252
R253
R254
R255
R259
R260
R261
R262
R263
R264
R265
R266
R267
R268
R269
R270
R271
R272
R273
R274
R283
R284
R289
R290
R602
R603
R604
R605
R606
R618
R619
R620
R637
W312
W314
W342
W386
W383
W365
W357
W380
W381
W382
W362
W363
W366
W370
W376
W368
W377
W384
W385
W387
W360
W379
W353
W358
W361
W373
W378
W394
W390
W397
W391
W389
W304
W369
W359
W300
W352
W348
W354
W335
W341
W347
W308
W371
W322
W343
W318
W302
W306
W325
W332
W349
W346
W327
W344
W345
W350
W356
W301
W367
W388
W307
W311
C247
W399
W364
W315
W310
W331
W372
W392
W396
W337
C246
W338
W339
W316
W317
W309
W313
W323
W324
W334
W328
W340
W336
W319
W320
W326
W321
W305
W303
W355
W330
W412
W329
W374
W393
R291
MAX
MIN
MIN
MAX
Rch
Lch
1
C205
C206
C504
C601
C505
C605
C117
C225
C226
C233
C234
C502
C503
W106
R133
C103
C104
C111
C112
C113
C114
C115
C116
C241
C213
C214
C215
C216
C219
C220
C231
C232
C235
C237
C238
C606
R101
R102
C611
C612
R256
R257
R258
R276
R277
R285
R286
R288
R505
R506
W119
W135
W131
W145
W133
W132
50
W151
W134
W116
W137
W126
W141
W111
W123
W127
W128
W136
W139
W143
W144
W138
W122
W129
W125
W115
W103
W108
W109
W130
W105
W102
W114
W146
W112
W147
W148
W101
W113
W110
W124
W121
W117
W100
W107
W118
W120
W140
W142
R131
R132
12
910
R134
R135
R136
R137
W104
VR3
VR1
VR2
VR4
B
BE
B
E
BE
BE
BE
EB
B
E
BE
B
E
B
E
BE
B
E
B
E
EB
E
B
E
B
EB
BE
BE
B
E
B
E
B
E
B
E
B
E
BE
B
E
BE
B
E
B
E
G-G GND
-15V
+15V
RCA-GND
GND
GND
R
L
VR
CONT
20-200Hz
HPF/OFF/LPF
ST/MONO
INPUT
SENS
SP-IN
RCA
D501
D101
D102
D503
Q201
Q202
D502
D103
D201
D206
D207
D210
Q203
Q204
Q205
Q206
Q601
Q602
Q603
Q609
Q604
J1
Q501
Q502
D601
D202
D203
D204
D205
D208
J2
Q207
Q208
Q209
Q210
Q211
Q212
Q213
Q214
Q215
Q217
Q218
Q219
Q220
Q221
D611
D612
Q225
23
Q224
S2
S1
Ref. No. Address
Q209
3G
Q210
5F
Q211
3G
Q212
4F
Q213
2G
Q214
6G
Q215
3F
Ref. No. Address
Q202
4G
Q203
3G
Q204
4F
Q205
3G
Q206
4F
Q207
3G
Q208
5F
Ref. No. Address
Q216
4E
Q217
3F
Q218
4F
Q219
3F
Q220
5G
Q221
3H
Q222
5E
Ref. No. Address
Q223
2E
Q224
5H
Q225
2H
Q226
6D
Q501
6I
Q502
6H
Q601
5G
Ref. No. Address
Q602
5G
Q603
5G
Q604
5G
Q605
5C
Q606
5C
Q607
5C
Q608
5C
Ref. No. Address
Q609
3F
Q610
4B
Q611
3B
Q612
3B
Q613
4C
Q614
4C
Q615
4C