Panasonic SA-AK78 Service Manual page 38

SA-AK78
SCHEMATIC DIAGRAM-12
IC453
TC74HCT7007A
INTERFACE
IC451
M38503M4254F
SYSTEM CONTROL
F
1 2 3 4 5 6 7 8 9 10
TUNER PACK BLOCK
RAL201
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1 2 3 4
A0 Y0 A1 Y1
Vcc A5 Y5 A4
14 13 12 11 10
5V 3V 4.7V 0V
0V 0V
0V 0V
3.2V 5V
R471 1K
C
R467 1K
E
R473 1K
B
R474 1K
A
R470 1.5K
D
R475 220
E
R476 220
H
R477 220
G
R478 220
I
R479 220
J
R480 220
F
5V
5V 5V 4.7V 4.7V 2.1V
1 2 3 4
42 41 40 39
3.2V 5.1V 5.1V 5.1V
R481
0V
4.7K
0V
R482
3.2V
4.7K
R483
4.7K
R484
47K
R485
4.7K
R486
4.7K
R488
220
C A G
R438
C P L O Q M
R499
220
CP201 CN702A
11
:POSITIVE VOLTAGE LINE :NEGATIVE VOLTAGE LINE
5 6 7
A2 Y2 GND
Y4 A3 Y3
9 8
0V 3.2V 5V
C452
0V 0V
0.01
0V 0V
0V 0V
R489
22K
5V 5V 2.1V 0V 2.5V 2V 0.5V
0V 0V 1.3V 0V 1.5V 2.4V 0.3V
0V 0V 1.3V 0V 1.5V 2.4V 0.3V
0V 5V 2.5V 2V 0.6V 0V
5 6 7 8 9 10 11 12
38 37 36 35 34 33 32 31
0V 0V 0.1V 5V 5V 0V
F D E B H J K
6.8K
A B C D E A C B
R462
10K
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
A
To CD SERVO CIRCUIT(CN702)
on SCHEMATIC DIAGRAM-2
38
:CD SIGNAL LINE
5.1V
R468
100K
C453
0.022
3
L452
10 H
1
3.3V
0V
0V
3.3V 0V 5V 5.1V 4.9V 2.1V 2.4V
13 14 15 16 17 18 19 20 21
30 29 28 27 26 25 24 23 22
0V 5V 5V 0V 0V 5V
0V 0V 0V
0V 0V 0V
5V 5V 5V
R458
2.7K
R459
2.7K
R460 C406
2.7K 330P
I A B C
3.3V
7.7V
-7.7V
14.2V
14.8V
D A
CN100
19 1 2 3 4 5 6 7 8 9 10
B
To MECHANISM CIRCUIT(H1100)
on SCHEMATIC DIAGRAM-6
X451
(8MHz)
2
J K E B