ViewSonic VP171 Service Manual page 78

5
+3.3VD
R106 C177
510
0.1uF
D R107
JP9
10k
2 1
3 ROTATE 4 3
Ball Switch
Option for Pivot SW
C
+3.3VD
C175
R120
0.1uF
NC
RP14
10k
JP10
12
KMENU
1
11
KSELECT
2
10
3
9
KDOWN
4
8
KUP
7
6
KLEDG
B 5
KLEDR
4
3
KPWR
2
1
R124
HEADER 12-2.0 C168 C169 R125 R126
0.1uF 0.1uF 510R 510R
(KEYPAD)
JP11
KMENU
10
KSELECT
9
8
KDOWN
7
KUP
6
5
KLEDG
4
KLEDR
3
2
KPWR
1
A
SMD
5
4
R96 R97
2.2K 2.2K
R100
100
2 SCL_IN1
R101 100
2 SDA_IN1
RP15 1k
8
7
6
5
R122 100R
R123 100R
1k C167
0.1uF
CP14
NC
4
ViewSonic Corporation
3
D5
DSUB1_5V BAV70 +5V
SOT23
2 1
3
C160
0.1uF
2 SCL_IN2
2 SDA_IN2
GND
U15
1 8
A0 VCC
R104 0
2 7
A1 WP
3 6
A2 SCL
4 5
GND SDA
PCB2421 R105 0
GND
2,3
MENU 3
SELECT 3
DOWN 3
R112 33
UP 3
2 HS_DSUB1
LEDG 3
R114
LEDR 3
2.2K
PWR_SW 3
R116 100
2 VS_DSUB1
R118 C165
2.2K 47pF
3
73
Confidential – Do Not Copy
2
DSUB2_5V
C159
R94 R95
0.1uF
2.2K 2.2K
R98
100 GND
R99 100
U14
1
A0 VCC
2
A1 WP
3
A2 SCL
4
GND SDA
PCB2421
DDCSCL1
3
DDCSDA1
3
GND
C174 0.1uF
+3.3VD R108
R109 10K 4.7K
R110 Q6
MUX_SEL
DTC144
C161
0
0.1uF
R111 NC
U16A
R113 33
2 3
2 HS_DSUB2
C163 74LVC126 R115
47pF 2.2K
U16C
R117 100
9 8
2 VS_DSUB2
74LVC126 R119
2.2K
R121 NC
2
VP171/s/b-1
1
D4
BAV70 +5V
SOT23
2 1
3
8
R102 NC
7
6
DDCSCL2
3
5
DDCSDA2
3
R103 NC
+3.3VD
74LVC126
PIN14
C162
22pF
U16B
R130 33
5 6
HS
C164 74LVC126
C178
47pF
22pF
U16D
R131 33
12 11
VS
C166 74LVC126
C179
47pF
22pF
Title
KEYPAD & DDC
Size Document Number
VP171/s/b
Date: Thursday, May 22, 2003 Sheet
1
D
C
3
B
3
A
Rev