June 15, 2005
6815854H01-A
5-52
Troubleshooting Charts:
Flowcharts
5.6.41 No TX Audio (700–800 MHz)
Figure 5-41. No TX Audio (700–800 MHz)
MAEPF-27814-O
1.0Vpp
at R6782 or
VN_T67770?
No
Yes
0.4Vpp
at TP6755 or
C6783?
No
Yes
Check deviation
tuning or replace
U6751
GOTO
Controller
Section
Check
synthesizer
loop filter
components
NOTE: After the modulated signal is coupled
through C6783 the signal is attenuated to levels
below 2mv making a measurement difficult for
most oscilloscopes.
Inject a 2.0Vpp
1kHz tone into Mic
input and key radio
START
No TX Audio
This Flow chart only checks the modulation
path of the FGU. Readings are typical and
can vary with deviation settings that are
programmed during tuning.
Содержание XTL 1500
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Страница 49: ...June 15 2005 6815854H01 A 2 12 Product Overview Controller Section Notes ...
Страница 161: ...June 15 2005 6815854H01 A 4 36 Troubleshooting Procedures Power Amplifier Procedures Notes ...
Страница 225: ...June 15 2005 6815854H01 A 5 64 Troubleshooting Charts Flowcharts Notes ...
Страница 429: ...8 2 Flex Cable Pin Out Lists Flex Cables June 15 2005 6815854H01 A Notes ...
Страница 441: ...June 15 2005 6815854H01 A Glossary 10 Notes ...
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