LG KG70c Service Manual page 23

KG70C
3.1.4 Checking Control Signal 3.1.4 Checking Control Signal
Test Point Test Point
Checking Flow Checking Flow
Check Pin # 3,#4,#5 Check Pin # 3,#4,#5
◆ Refer to Graph 3-1-2(a,b) ◆ Refer to Graph 3-1-2(a,b)
Check SBDT, SBCK SBST Check SBDT, SBCK SBST
Check if there is Check if there is
Any Major Difference Any Major Difference
◆ Refer to Graph 3-1-2(a,b) ◆ Refer to Graph 3-1-2(a,b)
Waveform Waveform
SBDT SBDT
SBCK SBCK
Graph 3-1-2(a) Graph 3-1-2(a)
Pin#3 Pin#3
Pin#4 Pin#4
Pin#5 Pin#5
No No
Level is High? Level is High?
Yes Yes
No No
Similar? Similar?
Yes Yes
Control Signal is Ok Control Signal is Ok
See next Page to check See next Page to check
Duplexer Duplexer
22
Pin#3 : SBDT Pin#3 : SBDT
Pin#4 : SBCK Pin#4 : SBCK
Pin#5 : SBST Pin#5 : SBST
Figure 3-1-4 Figure 3-1-4
Download the S/W Download the S/W
Download the S/W Download the S/W
SBST SBST
SBCK SBCK
Graph 3-1-2(b) Graph 3-1-2(b)