Schematic Diagram Of H3 And H4 Board - Sony KE-42XBR900 Service Manual

(7) Schematic Diagrams of H3 AND H4 Boards
1 3
2
A
S171 S172 S173 S174 S175
CH UP CH DW VOL UP VOL DW SELEC
R175
:CHIP
R172
R173
1.5k R174
B
2.7k
:CHIP 5.6k
:CHIP :CHIP
C171
0.01
D171
R171 F:CHIP
DAP202K-T-146
1.2k
:CHIP
C
H3
(KEY INPUT)
D
H3
[ KEY INPUT ]
— H3 BOARD —
<COMPONENT SIDE>
H3 BOARD
Terminal name of semiconductors in
silk screen printed circuit ( * )
Ref. *
D171 !º
* : Refer to Terminal name of semiconductors
in silk screen printed circuit (see page 4-18)
4 5 6
S176
SERVICE
15k
CN171
4P
WHT
:1.5DL
TO H1 BOARD
CN107
1 GND
GND
2
KEY-WAKE
3
4 KEY1
B-SS4335<UC.>-H3.
R172
R174 R173
<CONDUCTOR SIDE>
7 1
2
A
R191
1k
1/16W
:CHIP
C192
0.01
F:1608
B
C191
S191
0.01
F:1608
POWER
CN191
6P
WHT
:1.5DL
C
TO H1 BOARD
CN106
D
H4
[ POWER ]
— H4 BOARD —
<COMPONENT SIDE>
3 4 5
H4
(POWER)
B-SS4335<UC.>-H4.
C192
D191
C191
<CONDUCTOR SIDE>
6 7
KE-42XBR900(UC) 4-48