Printed Wiring Board - Key Board - Sony XR-4950X Service Manual

XR-4950X
6-7. PRINTED WIRING BOARD – KEY Board –
1 2 3
A
A
K
B
C
A
K
K2 A2
S2 S1
K1 A1
D
E
F
G
R939
H
• Semiconductor Location
Ref. No. Location Ref. No. Location
D901 H-11 LED901 A-2
D902 G-10 LED902 C-2
D903 G-10 LED903 C-4
D904 G-10 LED904 A-4
LED910 C-13
D952 G-6
LED911 B-13
IC901 G-8 LED912 B-5
LED913 C-5
4 5 6
K
A
K
52
A
LED901 – 904
K A
R930
7 8 9
K2 A2 K2 A2 K2
S2 S1 S2 S1 S2
K1 A1 K1 A1 K1
22 22
10 11 12
1
A2 K2 A2 K2 A2 K2
S2
S1 S2 S1 S2 S1
K1
A1 K1 A1 K1 A1
LSW912 – 917
K2
S2
K1
(Page 20)
13
A2
S1
A1
A2
S1
A1