Rx Trouble; Check Ant Feedback Points; Check Regulator Circuit - LG C3600 Service Manual

4. TROUBLE SHOOTING

4.2 RX Trouble

6 2 C H ,
6 2 C H ,

4.2.1 Check ANT Feedback Points

See Figure 4-1. Check ANT500 and ANT501 Check Wether the ANT Good Contacting

4.2.2 Check Regulator Circuit

C h eck P IN 5
R eg u lato r C ircuit O K see
S T A R T
H P 8 9 2 2 : T e s t M o d e
7 L e v e l S e t t i n g (
T C H 0
S e t t i n g ( B C C H )
- 6 0 d B m
1 C h e c k A N T
F e e d b a c k P i n t s
2 C h e c k R e g u l a t o r
C i r c u i t
3 C h e c k V C T C X O
C i r c u i t
4 C h e c k A N T S W
& M o b i l e S W
Figure 4-2 Regulator Circuit
C h eck P IN 1
R F 2.8V O K ?
N O
Y E S
N ex t P ag e
C h eck V C T C X O
R e d o w n l o a d S W , C a l
6 C h e c k R e c e i v i n g
I Q
5 C h e c k S A W
F i l t e r C i r c u i t
P IN 6 H IG H ?
N O
Y E S
R ep lace the
U 5 0 3
8
C h ange th e
B o ard