MOTOROLA CONFIDENTIAL - PROPRIETARY
6881036B20
November 20, 2000
35
Level 3 Service Manual
Troubleshooting
Figure 19. Device Will Not Transmit (Sheet 1 of 2)
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.
1. Connect a spectrum analyzer to
EXT CONN
TP1
:
2. Place UUT into manual test
mode, then enter 9823# (change
GSM mode),
110062#
(GSM
ARFCN),
1215#
(TX level), and
310#
(Pseudo-random TX).
3. A signal is present but it is low?
YES
Transmit power is low?
YES
Problem occurs on all
bands?
If unit passes "H" tests (see Figure 22. "No
Transmitter Control Matrix") check
U300
and
CR300
thru
CR306
.
See Note 1
NO
NO
YES
NO
M
H
C
1. Check signals on
U350
:
-
Pin 6
: SF_OUT (from L350, U200)
-
Pin 5
: TX275_DPCS, if DCS/PCS
channel is selected. (If not present, see
"H" Figure 22. "No Transmitter Control
Matrix".)
-
Pin 3
: TX275_GSM, if GSM channel is
selected. (If not present, see "H" Figure
22. "No Transmitter Control Matrix".)
-
Pin 2
: TX275_DCS, if DCS/PCS channel
is selected. (If not present, see "I" Figure
23. "PIN Diode Band Select".)
See Note 1
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: ......