LG GS290 - Page 95

- 96 -
LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
GS290 Operational Description Revision B
LG Electronics 96/136 LGE Property
Signals are
Normal ?
Replace
PMB6272(U500)
Yes
No
T
ransceiver is OK.
See next page to check
PAM Control Circuit.
Checking Flow
Check Output Signal
(TP1, TP2)
Figure 22. Transceiver Output (GMSK)
LBAND
_
PAM
_
IN (MODE: GMSK) : TP1 LBAND
_
PAM
_
IN (MODE: 8PSK) : TP1
EGSM 30CH EGSM 30CH
Figure 23. Transceiver Output (8PSK)