Sony KLV-26U300A Service Manual page 43

Mounted PWB H1 Board (Function Board)
CN901
9
8
7
6
TV Function BOARD
5
4 KEY_DET
3 ADC_IN2
2 ADC_IN1
1
3071816831
3V3_Keypad
C901
R910
10uF/10V 787 1%
0805
POWER
S901 2
1
4
3
5
SFKHUMP2225T
R911
0
3V3_Keypad
R912
NC
100/100M
L901
0805
C904
0.1U
D9105 D9104
D9106
BAV99 BAV99
BAV99
R901 R902
113 1% 68.1 1%
C+ SOURCE V+
1 S902 2 1 S903 2 1 S904 2
3 4 3 4 3 4
5 5 5
SFKHUMP2225T SFKHUMP2225T SFKHUMP2225T
R907
C902
113 1%
0.1U
3V3_Keypad
GND1
42
R903
R904
0 787 1%
C- V-
1 S905 1 S906
2
2
3
4 3 4
5
5
SFKHUMP2225T SFKHUMP2225T
R908
113 1% C903
0.1U
Key Voltage
s901
3.3x(113/[787+113])=0.414v
POWER
s902
C+ 3.3x[113/{113+113}]=1.65v
s903
SOURCE 3.3x[113/{68.1+113}]=2.05v
s904 V+ 3.3v
s905 C- 3.3x(113/[787+113])=0.414v
s906 V- 3.3x[37.4/{37.4+113}]=2.47v
s907 MENU 3.3v
Remark
R905 R906
37.4 1% 0
MENU
1 S907 2
3 4
5
SFKHUMP2225T
Register
126
157
253
31
190
254
KLV-26/32/37U300A