LG GX500 Service Manual page 105

4. TROUBLE SHOOTING
GX500 Operational Description
Checking Flow
Figure 4-55. GSMK Control Signal
LGE Internal Use Only
Check Control Signals
(TP1, TP2, TP3)
Signals are
Normal ?
Yes
PAM Control Signal is OK.
See next page to check
FEM & Mobile SW Circuit.
TP1(PA_LEVEL)
TP2(TXON_PA)
TP3(PA MODE)
TP1(PA_LEVEL)
TP2(TXON_PA)
TP3(PA MODE)
Check
No
PMB8877/PMB8888
(U101/U502)
Figure 4-56. 8PSK Control Signal
TP3(PA MODE) : R441/R623
TP1(PA_LEVEL) : R403/R605
TP2(TXON_PA) : R429/R620
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Revision A
TP2(TXON_PA)
TP1(PA_LEVEL)
TP3(PA MODE)
Only for training and service purposes