5-24
Troubleshooting Charts
September 5, 2008
6881076C25-E
Chart C.30 ASTRO Spectra Plus VOCON TX Modulation Failure Sheet 4 of 4
Chart C.31 ASTRO Spectra Plus VOCON RX Audio Failure
D
OK?
Measure waveform at TP403,
should match Figure 6-17
Amplitude of
waveform
may vary
Amplitude of
waveform
may vary
Amplitude of
waveform
may vary
Make sure that R407, R400,
C405 are placed and values
are correct
OK?
OK?
OK?
OK?
OK?
Repair proper
components
Replace U404
Replace U404
Repair proper
components
Make sure that R406, R437,
R438, C429, C402 are
placed and values are
correct
Make sure that R406, and
C404 are placed and values
are correct
Measure waveform at R406 (left),
should match Figure 6-17
Measure waveform at J501-39,
should match Figure 6-17
Microphone
input
Repair proper
components
Inspect and repair
J501
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Put the radio into Test mode (CSQ 1).
Connect RF Signal Generator to the RF
input of the radio. Use Dev=3kHz,
Amplitude=-47dBm and
Freq=851.025MHz
Measure waveform at the Vocon
Connector, J501 pin 40. Should
match Figure 6-19
Waveform
correct?
No trouble
found
Measure waveform at U402, pin 2.
Should look similar to Figure 6-19
but lower in amplitude.
Waveform
correct?
Waveforms
correct?
Make sure the following components
are placed and soldered correctly:
R404, R405, R416
Measure waveforms at U402,
pins 8, 7, 11. Should look similar
to Figure 6-18
Inspect placement
and soldering of
U402
Inspect placement and
soldering of U402
Waveform
correct?
Check BBP waveforms at TP219,
TP221, and TP223. Should look
similar to Figure 6-20
BBP
waveforms
correct?
Inspect placement
and soldering of
Patriot IC - U300
Make sure the following components are
placed and soldered correctly and recheck
BBP waveforms: U200, Q202, Q201,
L200, Q200
Waveforms
correct?
Refer board to
Service Depot
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
No
Yes
Содержание ASTRO Digital Spectra
Страница 1: ...ASTRO Digital Spectra and Digital Spectra Plus UHF VHF 800 MHz Mobile Radios Detailed Service Manual ...
Страница 2: ......
Страница 6: ...September 5 2008 6881076C25 E iv Document History Notes ...
Страница 20: ...xviii List of Tables September 5 2008 6881076C25 E Notes ...
Страница 24: ...September 5 2008 6881076C25 E xxii CommercialWarranty Notes ...
Страница 48: ...September 5 2008 6881076C25 E xlvi Model Numbering Charts and Specifications Notes ...
Страница 142: ...September 5 2008 6881076C25 E 3 82 Theory of Operation Power Amplifiers Notes ...
Страница 218: ...September 5 2008 6881076C25 E 4 76 Troubleshooting Procedures Power Amplifier Procedures Notes ...
Страница 258: ...September 5 2008 6881076C25 E 6 14 Troubleshooting Waveforms ASTRO Digital Spectra Plus VOCON Board Waveforms Notes ...
Страница 434: ...September 5 2008 6881076C25 E Glossary 10 Notes ...
Страница 440: ...Index 6 September 5 2008 6881076C25 E Notes ...
Страница 441: ......