Motorola ASTRO Digital Spectra Service Manual

Troubleshooting Charts 5-19
6881076C25-D October 28, 2002
Chart C.25 ASTRO Spectra Plus VOCON Power-Up Failure
Verify Standard Bias per
Table (xref to standard operating bias table)
Standard Bias
OK?
See Chart C.26
Measure waveform at R428,
should match Figure 6-11
Waveform
OK?
Make sure the following
components are placed
and soldered correctly:
U408, Y401, R427, R425, R426,
C423, C424, C422
OK?
Repair proper
components
Replace Y401
Fixed?
END
END
Replace U408
Fixed?
Refer board to
Service Depot
Yes
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Measure waveform at TP401,
should match Figure 6-12
Waveform
OK?
Waveform
OK?
Refer board to
Service Depot
Y400, U409, R456, R441, R442,
R435, R436, C420, R421, R430,
R443, C439, L400, C427
Make sure the following
components are placed
and soldered correctly:
Measure waveform at C326,
should match Figure 6-12
Yes
Yes
Yes
Yes
Yes
END
END
No
No
No
No
No
OK?
OK?
Repair proper
components
Repair Y400
Replace U409
Fixed?
Fixed?
Refer board to
Service Depot
Make sure C326 is placed
and soldered correctly
Refer board to
Service Depot
Repair C326
Note: Amplitude
may be lower
than Figure

Motorola ASTRO Digital Spectra Specifications

General

Brand	Motorola
Model	ASTRO Digital Spectra
Category	Radio
Language	English