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SCCE Training Group
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Drop calls
No TX 1800/1900
Insert test SIM into the phone and try to establish a connection at GSM900/1800 and 1900 with a CMD, for example.
If a connection is established try to make a call. Find out which TX band is faulty.
If a connection is possible in GSM900 only, refer to No GSM1800/1900 later on in this chapter.
Drop calls
If, in all GSM Bands, a connection is possible, but the bit error rate is too high and the connection is bad, set phone in
local mode and check TX spectrum at R805 (GSM900) (see picture below)
Bad spectrum
If the spectrum is not ok, check following measurement points:
VIO = 1.8VDC at R630
VR1A = 4.7VDC at R623
VR2 = 2.8VDC at C622
VR3 = 2.8VDC at R610
VR4 = 2.8VDC at C296
VR5 = 2.8VDC at R628
VR7 = 2.8VDC at C299
TX I and Q at C715/C716 on both sides (see picture below)
© NMP 2003
CONFIDENTIAL
NPE-4 6310/NPL-1 6310i
Date 22.04.2003
Spectrum ok
Checked by:
SCCE Training Group
23 (29)
Repair Hints
Version 3.0 Approved
Approved by:
SCCE
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