Technics SL-EH760 Service Manual page 68

SCHEMATIC DIAGRAM 4
F
MAIN CIRCUIT
0V 10.4V
Q406
2SB621ARSTA 10.3V
PLUNGER DRIVE
0V 4.7K
10K
Q402
1V
2SC3311ATA
INTERFACE
R440
47K
D403
1.4V
MA165TA
0.5V
Q403
2SC3311ATA
INTERFACE
Q401
UN4214TA
R402
100K
RESET
C401
4.7V
50V3.3
0V 10K
47K
X401
(8MHz)
1
2
3
2.1V
21 20
1.4V
P P
F=8MHz
22 23
4.8V 0V
R431
10K
R406
100
C D
:POSITIVE VOLTAGE LINE
10.2V
Q405
UN421FTA
PLUNGER DRIVE
CONT.
R436
4.7K
0.2V
D404
MA165TA
R441
0.5V
4.7K
0V
Q404
2SC3311ATA
INTERFACE
A B
2V 4.7V 4.8V 0V 4.7V
19 18 17 16 15 14 13
PLAY
3.3V
1.8V
P P
0V
T 13.3ms.
F=8MHz
T
24 25 26 27 28 29 30
0V 4.8V 0V 4.8V 4.8V 0V
R452
3.3K
E R453
3.3K
R454
3.3K
C D E
10.4V
8V
4.8V
PLAY
PLAY
5V
T 26.6ms.
0V
T 26.6ms.
A
A
B
(0.2V) (0.2V) (4.8V)
4.8V 3.3V 0V
C
8 9 10
Y3 A3 Y4
A
GND Y2 A2
7 6 5
B
IC452
TC74HCT7007A
3.3V TO 5V
CONVERTER
A
B
A B C
1.4V 0.4V 1V 3.3V 3.3V 0V 4.8V
12 11 10 9 8 7 6
PLAY PLAY
PLAY
5V 5V
0V 0V
F=75Hz
T 20ms.
20ms.
31 32 33 34 35 36 37
0V 0V 4.8V 4.8V 0V 0V 0V
H I G B D C
3.3V
PLAY
5V
3.3V
0V
0V
0V
F=75Hz
F=75Hz
B C D
(3.3V)
0V 0V 0V 4.8V
11 12 13 14
A4 Y5 A5 Vcc
Y1 A1 Y0 A0
4 3 2 1
0V 0V
B
C
D
R449 R448
1K 1K
E
A
D406
MA165TA
R433 10K
IC451
D407 M38504M6200F
MA165TA
SYSTEM CONTROL
(0.2V)
4.8V 1.6V 4.8V 4.8V
5 4 3 2 1
PLAY
5V
5V
0V
0V
T 26.6ms.
38 39 40 41 42
4.8V 4.8V 4.8V 4.8V 4.8V
R428
47K
R427 4.7K
R425 4.7K
R424 4.7K
R423 4.7K
R432 4.7K
C414 470P
E A F C413 470P
R422
10K
R421
10K
B A