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Troubleshooting
START
1. Connect an RF signal generator
to EXT CONN TP1. Set generator
(or DCS BCCH #700) as follows:
Frequency: 1842.8 MHz (DCS)
Level: -30 dBm
2. Place UUT into manual test
mode, then enter 9820# (change
DCS mode), 450700# (DCS
ARFCN).
Is fault DCS only?
1. Set generator (or PCS BCCH #661) as follows:
Frequency: 1960 MHz (PCS)
Level: -30 dBm
Enter 9822# (Change PCS mode), 450661#
(change PCS ARFCN)
Is fault PCS only?
RVCO_PCS and
RVCO_DCS are present on
U400 Pin 6 and Pin 4?
1960 MHz (PCS) signals
are present on C1402?
Correct signal is present on
C1405?
Correct signal is present on
C2452?
400 MHz signal is present
on C460?
Check for
intermittent faults
then end.
Figure 16. Device Will Not Receive DCS/PCS Signals
32
YES
NO
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
MOTOROLA CONFIDENTIAL - PROPRIETARY
Check FL1400 then U150 and U151.
See Note 1
Check FL2400 then U150 and U151.
See Note 1
See "L" Figure 24. "Receiver VCO Band
Select".
Check U400.
See Note 1
RX275_DPCS is present on collector of
Q1400?
See Note 1
Check FL1401.
See Note 1
RX275_DPCS is present on Q450 Pin 3
(approximately 1.2V)?
See Note 1
YES
Check Q450 .
November 20, 2000
Product Family 38C
In most cases, a reference board can be
used to compare signals.
NO
See "P" Figure 17. "No
Receiver Control Matrix".
Check Q1400.
YES
NO
See "P" Figure 17. "No
Receiver Control Matrix".
Note 1: Check components for correct
orientation, cold solder joints, physical
damage, and functionallity.
6881036B20
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Table of Contents
Troubleshooting
