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Level 3 Service Manual
Place UUT into manual
test mode, then enter:
432# (change audio path),
1556# (generate tone),
4707# (set audio volume)
2.7V is present on Q903 Pin 4?
No: check U900.
Yes: check Q903.
See Note 1
Check for intermittent
fault at LS1.
Figure 27. No Ring Tone
6881036B20
START
YES
No ringer function?
NO
Approximately 3V
YES
is present on Q903
Pins 1, 2, 5, 6?
NO
YES
MOTOROLA CONFIDENTIAL - PROPRIETARY
1. Install correct software
and flex file.
2. Reset UUT by entering
57#.
3. If malfunction persists,
check U900 and U800.
See Note 1
1. Install correct software
and flex file.
2. Reset UUT by entering
57#.
3. If malfunction persists,
continue.
Ring signal is
NO
present on Alert
Terminal Pin
ALRT_OUT?
November 20, 2000
Troubleshooting
Check U900.
See Note 1
Note 1: Check components for correct
orientation, cold solder joints, physical
damage, and functionallity.
000786-O
43
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Table of Contents
Troubleshooting
