Panasonic SA-AK18 Service Manual page 39
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Also See for SA-AK18:
- Service manual (120 pages) ,
- Wiring diagrams (40 pages) ,
- Operating instructions manual (32 pages)
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SCHEMATIC DIAGRAM-6
: +B Line
Q200,Q400
KTD1304TA
R322
MUTING
270
C233
50V10
C313
0.1
0V
((0V))
R220
<0V>
100K
Q200
0V
((0V))
<0V>
0V
((0V))
R323
<0V>
2.2K
Q400
R420
R324
100K
0V
2.2K
((0V))
C433
R325
<0V>
50V10
2.2K
R455
10K
R452
10K
R326
68K
R236
2.2K
0V
((0V))
<0V>
Q201
C238
0V
50V0.22
((0V))
<0V>
0V
((0V))
<0V>
C438
Q401
50V0.22
0V
((0V))
<0V>
R436
Q201,Q401
2.2K
KTC3199GRTA
MUTING
C236
0.47
14
13
12
11
10
9
8
7
CN309
TO
MOTOR
CIRCUIT
(CN1) ON
SCHEMATIC
DIAGRAM-15
: -B Line
R249
39
R248
39
C225
50V3.3
C228
R225
R224
16V10
3.3K
15K
-2.5V
((-2.5V))
C229
C230
<-2.5V>
-7.4V
100P
47P
((-7.4V))
0V((0V))
<-7.4V>
R221
<0V>
1K
4
3
2
1
-2.5V
IC302
((-2.5V))
<-2.5V>
R421
1K
5
6
7
8
C425
0V((0V))
0V((0V))
50V3.3
<0V>
<0V>
C428
C429
C430
16V10
100P
47P
C320
R425
R424
0.01
3.3K
15K
C317
50V1
0.1V
R327
((0.1V))
150K
<0.1V>
-2.5V
Q306
((-2.5V))
KRA102STA
<-2.5V>
MUTING CONTROL
0V
Q306
((0V))
<0V>
C329
0.1
0.7V
((0.7V))
R228
C330
<0.7V>
50V1
1K
R360
150K
1.8V
0.7V
Q309
R428
R360
((1.8V))
((0.7V))
1K
150K
<0.7V>
<1.8V>
1.7V
((1.7))
R361
<1.7V>
68K
0V
Q309
((0V))
KRA102STA
<0V>
LEVEL/VBASS
26
25
24
6
5
4
3
2
1
: Main Signal Line
R449
39
C232
C432
+7.5V
3300P
3300P
-7.0V
R448
39
CD7.5V
CD3.3V
SIG_INR
SW5V
R226
C242
-VP
100
50V1
LED9V
C237
1000P
C437
1000P
SIG_INL
15V
R426
C442
SIG_INL
50V1
100
SIG_INR
+7.5V
MUTEA
IC302
M5218AP
BUFFER AMP
CD
PCONT
HP_SW
MO10V
-7.0V
LVL1/VBASS
Q307
DC_DET
6.8V
5V
((6.9V))
((5V))
<6.8V>
<5V>
0V
C331
((0V))
50V4.7
<0V>
5V
((5V))
<5V>
4.1V
((4.1V))
<4.1V>
0V
((0V))
Q311
<0V>
Q352
R317
VREF+
1K
D312
RLN4003S-P
0V
((0V))
<0V>
Q350
CHG_PLGR
0V
((0V))
<0V>
0V
((0V))
<0V>
Q351
KRC102STA
DRIVER SWITCH
(PLUNGER)
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
TO
PANEL
CIRCUIT
(CP604) ON
SCHEMATIC
DIAGRAM-10
39
CN301
PGND
1
GND2
2
+7.5V
3
-7.0V
4
TO
5
POWER
6
CIRCUIT
CD7.5V
7
(CP500) ON
CD3.3V
SCHEMATIC
8
SW5V
DIAGRAM-13
9
-VP
10
LED9V
11
10V
12
CN300
TGND
1
R312
2.2
15V
2
SIG_INL
3
SIG_INR
4
TO
LO_OUT
5
POWER
GND1
6
CIRCUIT
7
(CP501) ON
SCHEMATIC
8
CD
DIAGRAM-13
9
DC_DET
10
PCONT
11
HP_SW
12
R313
39K
R316
15K
D313
1SS355TE17
4.1V
((4.1V))
<4.1V>
Q307
KRC111STA
COMPARATOR
SWITCH
10V
((10V))
Q311
<10V>
KRC111STA
R349
DC DETECTOR
10K
10V
((10V))
<10V>
Q352
KRA102STA
SWITCHING
R350
1K
10V
((10V))
<10V>
Q351
Q350
2SB621ARSTA
SWITCHING
(PLUNGER SUPPLY)
8
7
6
5
4
3
2
1
CN302
SA-AK18
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