MOTOROLA CONFIDENTIAL - PROPRIETARY
38
November 20, 2000
6881036B20
Troubleshooting
Product Family 38C
000782-O
Figure 22. No Transmitter Control Matrix
H
1. Place UUT in manual test mode by
entering 9823#, 110062#, 1215#, and 41#
(continuous transmit).
2. Is TX_EN present on Q120 Pin 3?
Check U800
See Note 1
Is RFV2 present
on Q120 Pin 1?
VREF is present on C213 (U900)?
No: check U900.
Yes: check Q201 and U200.
See Note 1
NO
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
Check Q120
See Note 1
Check U200
See Note 1
Check U200
See Note 1
Check Q2120
See Note 1
Check Q121
See Note 1
TX275 is present
on C1125?
SFOUT is present
on Q121 Pin 4?
Correct signal is present
on Q2120 Pin 1?
Correct signal is present
on C1126 (near Q2120)?
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: ......