MOTOROLA CONFIDENTIAL - PROPRIETARY
36
November 20, 2000
6881036B20
Troubleshooting
Product Family 38C
Figure 20. Device Will Not Transmit (Sheet 2 of 2)
C
In most cases, a reference board can be
used to compare signals.
Correct signal is present on base of
Q330
?
YES
NO
Check
U350
and the components
supporting
Q330
.
See Note 1
Correct signal is present on base of
Q331
?
YES
NO
TX275 (from Transceiver Control
Matrix) is present on
Q330
?
See Note 1
Correct signal is present on
U300
Pin 7
?
YES
NO
Bias (B+ from
L337
) and Gate
control (from
U390
) is present on
Q331
?
See Note 1
Correct signal is present on
U150
Pin 1
?
Does unit pass "H" tests (see Figure
22. "No Transmitter Control
Matrix")
YES
NO
Check
U300
and
CR300
thru
CR306
.
See Note 1
NO
See "H" Figure 22. "No
Transmitter Control Matrix".
Check
Q330
and the
components supporting
Q331
.
NO
Check
U390
and
U200
.
1. Check bias on
U300
:
-
Pins 2
and
8
: Negative control voltage
from gate control
(If negative control voltage is not correct
see "N" Figure 21. "Low Transmitter
Power".)
-
Pins 10
to
15
: PA_B+
(If not correct, see "O" Figure 21. "Low
Transmitter Power".)
2. If signals are correct, check
U300
,
CR301
,
CR302
,
CR303
, and
CR305
.
Note 1: Check components for correct
orientation, cold solder joints, physical
damage, and functionallity.
YES
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: ......