Motorola 38C V100 Service Manual page 48

Troubleshooting
Figure 28. No Audio
44
START
Place UUT into manual test
mode, then enter 481000#
(generate 1 KHz tone), 430#
(change audio path), 4707#
(set audio volume)
1 KHz tone (approximately
0.5V P-P) is present on
headset terminal?
YES
1. Remove headset.
2. 2.7V is present on
R977?
YES
1. Connect headset.
2. Voltage on R977 is
now approximately
0.5V?
NO
Check J504
See Note 1
MOTOROLA CONFIDENTIAL - PROPRIETARY
Check J504, C511, C951,
NO
C952, and R961
See Note 1
NO
Check R976,CR901
See Note 1
YES
Check U900
See Note 1
November 20, 2000
Product Family 38C
Note 1: Check components for correct
orientation, cold solder joints, physical
damage, and functionallity.
000787-O
6881036B20