LG HB620 Service Manual page 113

4. TROUBLE SHOOTING
For testing, Max power of UMT 2100 is needed.
Click Tx on and WCDMA set
Check Tx SAW Filter
NO
FL105
LGE Internal Use Only
Run a FTM program .
Set RF mode to IMT.
Set uplink freq. to 9750 .
PA range R 1 on.
Set Tx AGC to 410.
Check a
YES
Current over
500mA?
NO
Check TP 4
over - 5dBm
YES
Check PA M block
U105
- 114 -
NO
Check TP1
over 25dBm?
YES
NO
Check TP 2
over 23dBm ?
YES
NO
Check TP3
over 22dBm?
YES
Tx is OK
Check other parts
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Only for training and service purposes
Check coupler U104
Check Duplexer
FL104
Check FEM FL101