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Troubleshooting
1. Set generator (or GSM ARFCN #62) as
follows:
Frequency: 947.4 MHz
Level:-30 dBm
2. Place UUT into manual test mode, then
enter: 9823# (change GSM/DCS mode) and
450062# (GSM ARFCN).
2. Is signal present on U250 Pin 1
(1347.4 MHz)?
RVCO_275 voltage
present on U250 Pin 6?
RVCO_DCS and RVCO_PCS
voltages present on U250 Pin 3
and Pin 4?
Check in order:
U250, U200, and U800
See Note 1
Figure 18. No Receive VCO
34
Q
NO
YES
NO
YES
NO
YES
MOTOROLA CONFIDENTIAL - PROPRIETARY
RVCO_275 present on L259?
See Note 1
Check Q1100 then U200
See Note 1
L
November 20, 2000
Product Family 38C
In most cases, a reference board can be
used to compare signals.
YES
Check Q252
See Note 1
NO
Check Q1100 then U200
See Note 1
Note 1: Check components for correct
orientation, cold solder joints, physical
damage, and functionallity.
000778-O
6881036B20
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Table of Contents
Troubleshooting
