Printed Wiring Board - Base Key Board - Sony SPP-A941 Service Manual

SPP-A941
• Waveforms
– BASE MAIN Board –
1 U1 wh (OSC2)
2 V/DIV, 100 ns/DIV
4.5 Vp-p
250 ns
– HAND MAIN Board –
2 U3 wh (OSC2)
2 V/DIV, 100 ns/DIV
4 Vp-p
250 ns
• Semiconductor
Location
Ref. No.
LD1
LD2
LD3
LD4
LED1
LED2
U1
– 27 –
5-6. PRINTED WIRING BOARD – BASE KEY Board – •
1
BASE KEY BOARD
A
KP0
REC/MEMO
B
KP1
C
ERASE
D
TIME/SET
E
F
G
H
LED2
CHARGE
LED1
I
IN USE
Location
C-6
27
H-5
G-5
F-5
J
I-2
H-2 05
C-4
See page 21 for Note on Printed Wiring Board.
2 3 4
BLK
SP1
RED
16 9
U1
(MESSAGE COUNTER)
1
8
KP42 KP41 KP40
SELECT MENU
KP12, LD4
KP12 3
LD4
KP20
SLOW
KP11, LD3
REPEAT
2
LD3
KP11
KP10, LD2
MAIL BOX
KP10
1
LD2
A BASE MAIN
(Page 24)
BOARD
J3
– 28 –
5 6
KP2, LD1
ANSWER
ON/OFF
KP2
LD1
VOLUME
– +
KP31
KP30
KP22
QUICK
SKIP
KP16
HANDSET
LOCATOR
1
1-676-810-
11