Service manual

5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
74LVC126
PIN14
(KEYPAD)
Option for Pivot SW
KEYPAD & DDC
Thursday, May 22, 2003
Title
Size Document Number
Rev
Date:
Sheet
KSELECT
KMENU
KLEDG
KPWR
KLEDR
KDOWN
KUP
KMENU
KSELECT
KDOWN
KUP
KLEDG
KLEDR
KPWR
VS_DSUB22
SCL_IN12
SDA_IN12
SCL_IN22
SDA_IN22
HS_DSUB22
HS_DSUB12
VS_DSUB12
MUX_SEL
2,3
DDCSCL1
3
DDCSCL2
3
DDCSDA2
3
DDCSDA1
3
ROTATE3
MENU 3
SELECT 3
DOWN 3
UP 3
PWR_SW 3
LEDG 3
LEDR 3
HS 3
VS 3
+3.3VD
+3.3VD+3.3VD
DSUB2_5V +5V
GND
GND
DSUB1_5V +5V
GND
GND
+3.3VD
R109 10K
R104 0
R105 0
RP14
10k
1 8 2 7 3 6 4 5
R102 NC
R103 NC
R123 100R
R122 100R
C174 0.1uF
C168
0.1uF
C169
0.1uF
R126
510R
R125
510R
JP10
HEADER 12-2.0
1
2
3
4
5
6
7
8
9
10
11
12
R119
2.2K
R98
100
C159
0.1uF
R95
2.2K
U16B
74LVC126
5 6
4
U16A
74LVC126
2 3
1
Q6
DTC144
R118
2.2K
R99 100
R131 33
C179
22pF
R130 33
C178
22pF
R117 100
R94
2.2K
R112 33
R115
2.2K
U16C
74LVC126
9 8
10
U14
PCB2421
4
81
2
3
7
6
5
GND
VCCA0
A1
A2
WP
SCL
SDA
C162
22pF
U16D
74LVC126
12 11
13
R116 100
R114
2.2K
R110
0
R113 33
C161
0.1uF
C166
47pF
C164
47pF
R108
4.7K
C165
47pF
C163
47pF
12
3
SOT23
D4
BAV70
C167
0.1uF
JP9
Ball Switch
12
34
R124 1k
C175
0.1uF
R106
510
R120
NC
JP11
SMD
1
2
3
4
5
6
7
8
9
10
R107
10k
C177
0.1uF
CP14
NC
1 27 36 45
8
RP15
1k
1 8
2 7
3 6
4 5
R96
2.2K
R101 100
C160
0.1uF
R97
2.2K
R100
100
12
3
SOT23
D5
BAV70
U15
PCB2421
4
81
2
3
7
6
5
GND
VCCA0
A1
A2
WP
SCL
SDA
R121 NC
R111 NC
!
!
ViewSonic Corporation
73
Confidential – Do Not Copy
VP171/s/b-1
VP171/s/b