LG KU580 Service Manual - Page 152
D. GSM PAM Check
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4. TROUBLE SHOOTING D. GSM PAM Check Vapc (R113) GSM/EDGE PAM (+Ant. SW) DCS/PCS Tx (C112) GSM Tx (C112) Figure 4-44-1. Test points of GSM/DCS/PCS Tx Check Vapc level. Check if there is any Major difference. Refer to Figure 4-44-1 GSM>1.5 V? DCS/PCS>1.3 V? Yes No Redownload SW, Cal Check GSM/DCS PAM GSM:33.0dBm No output power at ➄ . DCS: 31.0dBm Yes GSM Tx path OK. See Next page to check Changing GSM PAM (N400) Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes - 153 - LGE Internal Use Only
- 153 -
LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc.
All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
D. GSM PAM Check
DCS/PCS Tx
(C112)
GSM Tx
(C112)
Vapc
(R113)
GSM/EDGE
PAM
(+Ant. SW)
GSM:33.0dBm
DCS: 31.0dBm
Yes
Changing GSM PAM
(N400)
Check GSM/DCS PAM
output power at
.
GSM Tx path OK. See Next page to check
Check Vapc level.
Check if there is any Major
difference.
Refer to Figure 4-44-1
Yes
No
Redownload SW, Cal
GSM>1.5 V?
No
DCS/PCS>1.3 V?
➄
Figure 4-44-1. Test points of GSM/DCS/PCS Tx