LG KG270 Service Manual - Page 52
Pin 2, Pin 1, Pin 3
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4. TROUBLE SHOOTING RX Trouble TEST POINT SW400 Pin 1 Pin 2 U400 Pin 3 CHECKING FLOW Check Pin 1, 2 of SW400 with RF Cable FL400 Pin 7 FL401 U102 Signal is OK ? Yes N o Replace Mobile SW (SW400) Check Pin 1,2 Yes Control No Signal is OK ? Yes Check ULC2 (U102) Pin 3,7 Signal is normal ? Yes No Replace ASM (FL400) Mobile SW & ASM is OK. Check Antenna. - 53 -
4. TROUBLE SHOOTING
- 53 -
RX Trouble
U400
SW400
U102
FL400
FL401
Pin 2
Pin 1
Pin 3
Pin 7
TEST POINT
Check Pin 1, 2 of
SW400
with RF Cable
Signal is
OK ?
Replace Mobile
SW (SW400)
Yes
No
Yes
Mobile SW & ASM is
OK.
Check Antenna.
Check ULC2
(U102)
Control
Signal is
OK ?
No
Yes
Check Pin 1,2
Replace ASM
(FL400)
Pin 3,7
Signal is
normal ?
No
Yes
CHECKING FLOW