Samsung SGH-A500 Service Manual page 29

17. Key Matrix & LED Circuit Diagram
1
VINT
U501
R506
51K
2
OUT
FLIP_SN
FLIP_SENSE
CN501
AGND
MIC_PA D
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2 3
VBA T
C510 LED13
LED14
5.6PF
R567
R568 R569
100
10 220
Q502 Q503 Q506
3 3 3
1 1
RD_LED GR_LED
2 2 2
ALERT_LED_O N
VCC 1
GND
3
C502
U603
100N F
5
VOUT
4
BYP
GND
C501
C503
10U F
470PF
6.3V
R522 R523
MICP 1 R503 R50 1
24 24
24 24
C50 4
NC
AGND
SAMSUNG Proprietary-Contents may change without notice
4 5
VOL_U P
2 1
KP 6
5 4 3
VOL_D N
2 1
KP 8
5 4 3
1
BL_LED
POWER_ON
KP6
KP7
KP8
KP9
KP0
KP1
KP2
KP3
KP4
KP5
VBA T
3
2
1 1
VI N
ZD500
3
CT L
LED_CT L
2
R50 2
10 K
R524 R525 R526 R52 7 R52 8 R52 9
R512 R520
R513
18 0 18 0 180 18 0 18 0 18 0
18 0 18 0
180
Changed by
user10
6-15
SGH-A500 Flow Chart of Troubleshooting and Circuit Diagrams
6 7
2 1 2 1 2 1
KEY0 4 KEY0 2 KEY0 6
KP1
2 1
VOL_U P VOL_DOW N
KEY05
2 1 2 1 2 1
KEY1 0 KEY1 1 KEY12
2 1 2 1 2 1
KEY1 3 KEY14 KEY15
2 1 2 1 2 1
KEY1 6 KEY1 7 KEY18
VBA T
2 1 2 1 2 1 2 1
KEY0 9 KEY1 9 KEY2 0
KEY21
6 7 8
4 3 4 3 4
5 2 5 2 5
1 1
6 6 6
ZD50 2
ZD501
R530 R531
R521
180 180
180
Engineer
Kim. H. K
Drawn by
Kim. H. K
R&D CH K
TITLE :
DOC CTRL CH K
SGH-A500_REV1.9B
MFG ENGR CH K
Date Changed Time Changed QA CH K REV
2002 -09 - 30 1.9B
1:51:41 pm
8
A
0
2 1
KEY0 8
1
2 1
KEY0 3
5
B
2 1
KEY0 1
4
3
2 1
KEY0 7
C
2
9
KEY_PA D
D
EPP 2
E
S1 S2 S3 S4
COMPANY NAME
Address
F
City
Size
A3
Drawing Numbe r
Shee t 5 of
6