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4. TROUBLE SHOOTING
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Only for training and service purposes
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4.3.4 Checking GSM Tx part
Setup Test Equipment
Cell Power = -60dBm
Tx Power Level Set
(GSM=5, DCS=0, PCS=0)
Is the level of
TP4, TP5 same
to Table.1?
TP4 : Check U200
TP5 : Check VBAT Line
No
Yes
Re-download & Calibration
Check U200
Replace U100
TP2, 30dBm over?
TP3, 33dBm over?
Check TP1
GSM850, EGSM 32dBm
DCS, PCS 29dBm
over?
The power of pin1, pin8
Is over 0dBm?
Remove U100 and check
the power of pin1, pin8.
(on board)
No
No
No
Yes
Yes
Yes
TP3
TP2
TP4
TP5
TP1