LG KT520 Service Manual page 41

3. TECHNICAL BRIEF
3.1.13 Key Pad and Touch key
There are 22 buttons and 3 side keys and 1 Optical Joystick key in Figure 3-1-13/14. Shows the
Keypad circuit. 'END' Key is connected ONSWAn for AB3000.
KEYIN0
KEYOUT0 Volume up Volume down
side key
KEYOUT1 1
KEYOUT2 4
KEYOUT3 7
KEYOUT4 *
KB_STAR
LGE Internal Use Only
KEYIN1 KEYIN2
Camera1
side key Side key
2 3
5 6
8 9
0 #
Table 3-1-8. Key Matrix Mapping Table
RB521S-30
D501
1 2 3
1 2 3
KEYOUT1
6
4 5
4 5 6
KEYOUT2
7 8 9
7 8 9
KEYOUT3
0 #
*
KB511
0
KEY PAD AND SIDE KEY PAD
Figure 3-1-14. MAIN PCB KeyPad Circuit
- 42 -
KEYIN3 KEYIN4
Camera2
Side key
soft1 up
left OK
hot down
call
ONSWA_n
6
Volume
5
4
Camera
3
2
1
CN523
KEYOUT0
R642
KEYOUT4
DNI
R643
110
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
KEYIN5 GND
END
Soft2
right
cancel