Panasonic SA-AK18 Service Manual page 42
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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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SA-AK18
SCHEMATIC DIAGRAM-9
R322
270
C313
0.1
C224
R219
50V3.3
4.7K
R323
2.2K
R324
2.2K
R325
2.2K
R455
10K
R452
10K
R419
C424
4.7K
50V3.3
C236
0.47
14
13
12
CN309
: +B Line
Q200,Q400
KTD1304TA
MUTING
C233
C225
50V10
50V3.3
0V
-2.5V
((0V))
((-2.5V))
R220
<0V>
<-2.5V>
-7.4V
100K
Q200
((-7.4V))
R221
<-7.4V>
0V
1K
((0V))
<0V>
0V
-2.5V
((0V))
((-2.5V))
<0V>
<-2.5V>
Q400
R420
R421
100K
0V
1K
((0V))
C433
C425
0V((0V))
<0V>
50V10
50V3.3
C428
16V10
C320
C317
0.01
50V1
0.1V
R327
((0.1V))
150K
<0.1V>
-2.5V
Q306
((-2.5V))
R326
KRA102STA
<-2.5V>
68K
MUTING CONTROL
0V
Q306
((0V))
<0V>
R236
2.2K
0V
0.7V
((0V))
((0.7V))
R228
C330
<0V>
50V1
<0.7V>
1K
Q201
C238
0V
50V0.22
((0V))
R360
150K
<0V>
0V
0.7V
Q309
((0V))
((0.7V))
R428
<0.7V>
1K
<0V>
C438
Q401
1.7V
50V0.22
0V
((1.7))
R361
((0V))
<1.7V>
68K
<0V>
R436
Q201,Q401
2.2K
KTC3199GRTA
MUTING
11
10
9
8
7
6
5
4
3
2
1
TO
MOTOR
CIRCUIT
(CN1) ON
SCHEMATIC
DIAGRAM-15
: -B Line
R249
R449
39
39
C232
C432
+7.5V
3300P
3300P
-7.0V
R248
R448
39
39
CD7.5V
C228
R225
R224
16V10
3.3K
15K
CD3.3V
C229
C230
SIG_INR
SW5V
100P
47P
0V((0V))
R226
C242
-VP
<0V>
100
50V1
4
3
2
1
LED9V
C237
1000P
IC302
C437
1000P
5
6
7
8
0V((0V))
SIG_INL
15V
<0V>
<0V>
C429
C430
R426
C442
H_OUT_L
100P
47P
100
50V1
H_OUT_R
R425
R424
3.3K
15K
+7.5V
MUTEA
IC302
M5218AP
BUFFER AMP
CD
PCONT
HP_SW
MO10V
-7.0V
1.8V
((1.8V))
<1.8V>
LVL1/VBASS
DC_DET
0V
Q309
((0V))
KRA102STA
<0V>
LEVEL/VBASS
5V
((5V))
<5V>
0V
((0V))
Q311
<0V>
VREF+
RL1N4003S-P
26
25
24
23
22
21
20
19
18
17
16
15
14
TO
PANEL
CIRCUIT
(CP604) ON
SCHEMATIC
DIAGRAM-11
42
: Main Signal Line
1
2
3
4
5
6
7
8
9
10
11
12
CN300
1
R312
2.2
2
3
4
5
6
7
8
9
10
11
12
Q307
6.8V
R313
5V
((6.9V))
39K
((5V))
<6.8V>
<5V>
R316
15K
0V
C331
((0V))
50V4.7
<0V>
4.1V
((4.1V))
<4.1V>
D313
1SS355TE17
Q352
4.1V
((4.1V))
<4.1V>
R317
1K
Q307
D312
KRC111STA
COMPARATOR
SWITCH
0V
10V
((0V))
((10V))
Q311
<0V>
<10V>
KRC111STA
R349
DC DETECTOR
10K
10V
((10V))
<10V>
Q350
Q352
KRA102STA
R350
1K
DETECT SWITCH
(PCONT)
10V
((10V))
<10V>
CHG_PLGR
Q351
0V
((0V))
<0V>
0V
((0V))
<0V>
Q351
Q350
KRC102STA
2SB621ARSTA
DRIVER SWITCH
SWITCHING
(PLUNGER)
(PLUNGER SUPPLY)
13
12
11
10
9
8
7
6
5
4
3
2
1
CN302
CN301
PGND
GND2
+7.5V
-7.0V
TO
POWER
CIRCUIT
CD7.5V
(CP500) ON
CD3.3V
SCHEMATIC
SW5V
DIAGRAM-13
-VP
LED9V
10V
TGND
15V
SIG_INL
SIG_INR
LO_OUT
TO
POWER
GND1
CIRCUIT
(CP501) ON
SCHEMATIC
CD
DIAGRAM-13
DC_DET
PCONT
HP_SW
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