LG GD580 - Page 162

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4. Trouble Shooting
D. GSM PAM Check
EGSM:32.5dBm
DCS/PCS: 29.5dBm
Yes
Changing GSM PAM
(U105)
Check
EGSM/DCS/PCS PAM
output power at SW101.
GSM Tx path OK. See Next page to check
Check Vapc level.
Check if there is any Major
difference.
Refer to Figure 4-19-7
Yes
No
Redownload SW, Cal
EGSM>1.5 V?
No
Figure 4-19-7. Test points of EGSM/DCS/PCS Tx
DCS/PCS>1.3 V?
EGSM/DCS/PC
S Tx (L115,
C158)
(Bottom)
GSM/EDG
E PAM
(+Ant. SW)
U105
Vapc
(PIN 25)
(Top)