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Troubleshooting
68P02963C70-O
3 - 27
Audio Troubleshooting (External Mic to External Out)
Set the audio input to the external mic to 1.02KHz @ 44mV RMS. Test sequence is controlled by TetraCom commands to
the external mic-to-external out loopback.
Check R110, C103 &
continuity to connec-
tor.
Check R108, C104 &
continuity to connec-
tor.
No trouble found
Connect a scope or DVM to the following points
and measure ac levels in Vrms.
Start AUDIO_LOOPBACK (1)
Is voltage at
C103 =
44mVRMS?
Yes
No
Yes
No
Tetracom Routine
MIC VA
MICGA 0
DSP_LOOP ON
DSP_VOL 0
Vol 0
SPKR VA
Is voltage at
C104=
66mVRMS?
Содержание MTH500
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Страница 14: ...Foreword xiv 68P02963C70 O THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 18: ...Overview 1 4 68P02963C70 O THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 50: ...Theory of Operation 2 32 68P02963C70 O THIS PAGE INTENTIONALLY LEFT BLANK ...
Страница 76: ...Troubleshooting 3 26 68P02963C70 O Offset VCO Test ...
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Страница 82: ...Programming the Radio 4 4 68P02963C70 O This page left blank intentionally ...
Страница 100: ...Maintenance 5 18 68P02963C70 O Figure 23 Exploded View 1 2 3 4 5 7 6 X6 8 ...
Страница 101: ...Maintenance 68P02963C70 O 5 19 Figure 24 Exploded View of Chassis Assembly 9 12 13 10 11 14 ...
Страница 102: ...Maintenance 5 20 68P02963C70 O ...
Страница 103: ...MTH500 Detailed Service Manual COMPONENT BOARD LAYOUTS 68P02963C70 O 6 1 Component Board Layouts ...
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Страница 109: ...MTH500 Detailed Service Manual Schematic Diagrams and Parts Lists 68P02963C70 O 6 7 Schematic Diagrams and Parts Lists ...
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