
MOTOROLA CONFIDENTIAL - PROPRIETARY
6881036B20
November 20, 2000
45
Level 3 Service Manual
Troubleshooting
000788-O
Figure 29. Headset Microphone Not Functioning
VAG (approximately 1.4V)
is present on
R920
?
START
Check
U900
See Note 1
1. Connect a headset.
2. Place UUT into manual
test mode, then enter 430#
(change audio path), 36#
(initiate acoustic loopback),
4707# (set audio level)
Approximately 1V is
present on
C1025
?
Check
J504
,
U900
and
related components.
See Note 1
Check
J504
See Note 1
Check
U800
and
U900
See Note 1
Check
R976
,
CR901
See Note 1
YES
NO
NO
NO
NO
YES
YES
YES
MIC signal is
present on
C1025
?
Check
R928
and
C927
.
See Note 1
YES
NO
1. Remove headset.
2. 2.7V is present on
R977
?
1. Connect headset.
2. Approximately 0.5V
is now present on
R977
?
Note 1: Check components for correct
orientation, cold solder joints, physical
damage, and functionallity.
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: ......