Technics SX-PR603 Service Manual page 117

SCHEMATIC DIAGRAM-25
E
MKB1 CIRCUIT
+5V
CN3
C4
C1
1
+5 6.3V47
0.1
2
E
KF0 3
4
KS0
5
KF1
6
KS1
7
KF2
KS2 8
9
KB3
10
KF3
11
KS3
12
KB2
KB1 13
14
KB0
15
KB4
16
E
1
A0
2
A1
3
A2
4
CS2
5 CS3
6
CS1
7
7 Y
8
GND
UNLESS OTHERWISE SPECIFIED:
DIODES ARE MA165.
+5
IC1
HD74LS138P
16
+VCC
(3 TO 8 DECODER)
15
0
14
1
13
2
Y 3 12
11
4
10
5
9
6
C6
0.1