
- 53 -
3. TECHNICAL BRIEF
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3.9 Keypad Switching & Scanning
The keypad interface is a peripheral which can be used for scanning keypads up to 5 rows (outputs
from Port Control Logic) and 6 columns (inputs to PCL). The number of rows and columns depend on
settings of the PCL.
Volume up & down, Clear, Send, End/Power on keys are located on the Key PCB. And MP3 hot key,
Camera AF trigger & shutter, numeric keys are connected by Key FPCB.
Figure 14 Key FPCB part key matrix
AF
SHUTTER
VOL_UP
101
star
104
sharp
106
VOL_DN
108
AF CAM
110
103
109
105
102
107
KP_IN(3)
KP_OUT(0:4)
KP_IN(2)
KP_OUT(0)
KP_OUT(1)
KP_OUT(2)
KP_OUT(3)
KP_OUT(4)
KP_IN(1)
KP_IN(1:4)
KP_IN(4)
Figure 15 Key PCB part key matrix
SEND
RIGHT
MENU
DOWN
LEFT
CLEAR
UP
OK
SELECT
KP_OUT(0)
KP_IN(5)
KP_IN(6)
KP_IN(5:6)
KP_OUT(0:4)
KP_OUT(1)
KP_OUT(2)
KP_OUT(3)
KP_OUT(4)
150
R106
END
VBAT
VA114
END_KEY
Содержание KC550
Страница 1: ...Date May 2008 Issue 1 0 Service Manual Model KC550 Service Manual KC550 Internal Use Only ...
Страница 129: ... 130 LGE Internal Use Only Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes ...
Страница 155: ...LGE Internal Use Only Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes 156 ...
Страница 182: ...Note ...
Страница 183: ...Note ...