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Customer Care Europe, Middle East & Africa
SCCE Training Group
Poor service or no network coverage, C508 faulty
In case of this fault combined with a working RX-calibration, but whose values are not ok (incorrect stepwidth as shown in figure
12-25), check signals at R500 and R504. The signals below were measured in RX-burstmode with an input level of –65 dB.
Channel 1 shows the signals of a proper working phone while channel 2 shows the same signals of a phone in which C508 is
faulty. R500 contains four resistors, so that you have to measure all four lines. It could happen that you will get the signal shown
in channel 2 more than once. That means that more than one of the four capacitors in C508 is broken.
Figure 12-25
Figure 12-26
Signals measured at R504
(RX burstmode, input level –65 dBm):
Figure 12-27
Signals measured at R500
(RX burstmode, input level –65 dBm):
© NMP 2002
CONFIDENTIAL
NHM—2/5/6
3410
Date 20.11.2002
OK
Checked by:
Customer Care E&A
Repairhints
Version 4.0 Approved
Not OK
Approved by:
SCCE Training Group
43 (44)
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