LG KG270 Service Manual - Page 48
RX Trouble, FL401 6,7 and 8,9 output are, balanced
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4. TROUBLE SHOOTING RX Trouble TEST POINT SW400 Pin 4 U400 FL400 Pin 6 FL401 U102 CHECKING FLOW Check Pin 1, 2 of SW400 with RF Cable Signal is OK ? Yes Check Pin 4,6 of FL400 ? Yes Check Pin 6,7 and 8,9 of FL401 ? Yes N o Replace Mobile SW (SW400) N o Replace ASM (FL400) N o Replace SAW Filter (FL401) Mobile SW & ASM is OK. See next page * FL401 6,7 and 8,9 output are balanced - 49 -
4. TROUBLE SHOOTING
- 49 -
RX Trouble
* FL401 6,7 and 8,9 output are
balanced
U400
SW400
U102
FL400
FL401
Pin 6
Pin 4
Check Pin 1, 2 of
SW400
with RF Cable
Signal is
OK ?
Replace
Mobile SW
(SW400)
Yes
N
o
Yes
Mobile SW & ASM is OK.
See next page
Replace ASM
(FL400)
N
o
Yes
Check Pin 4,6 of
FL400 ?
Replace SAW
Filter (FL401)
N
o
Check Pin 6,7 and 8,9 of
FL401 ?
TEST POINT
CHECKING FLOW