MOTOROLA CONFIDENTIAL - PROPRIETARY
34
November 20, 2000
6881036B20
Troubleshooting
Product Family 38C
000778-O
Figure 18. No Receive VCO
Q
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).
RVCO_275 present on
L259
?
See Note 1
RVCO_275 voltage
present on
U250 Pin 6
?
Check
Q1100
then
U200
See Note 1
Check in order:
U250
,
U200
, and
U800
See Note 1
NO
NO
NO
YES
YES
YES
L
RVCO_DCS and RVCO_PCS
voltages present on
U250 Pin 3
and
Pin 4
?
NO
YES
Check
Q1100
then
U200
See Note 1
Check
Q252
See Note 1
2. Is signal present on
U250 Pin 1
(1347.4 MHz)?
Note 1: Check components for correct
orientation, cold solder joints, physical
damage, and functionallity.
In most cases, a reference board can be
used to compare signals.
Summary of Contents for 38C V100
Page 1: ...Level 3 Service Manual Model V100 GSM Technology Product Family 38C Personal Communicator ...
Page 2: ......
Page 73: ...V100 BOARD LAYOUT PAGE 1 2 ...
Page 74: ...V100 BOARD LAYOUT PAGE 2 2 ...
Page 77: ...V100 CONNECTOR SCHEMATICS ...
Page 78: ...V100 DISPLAY SCHEMATICS ...
Page 79: ...V100 FM SCHEMATICS ...
Page 81: ......
Page 83: ......