Waveform W7: Receive Audio; Waveform W8: Transmit Audio - Motorola ASTRO Digital Spectra Plus Detailed Service Manual

Troubleshooting Waveforms: ASTRO Digital Spectra Waveforms

Waveform W7: Receive Audio

Waveform W8: Transmit Audio

6881076C25-E
Tek stopped: 103 Acquisitions
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5.00V Ch2 500mV
Ch1
Ch4
10.00V 10.00V
Ch3
W7: Receive audio: Receiving
1KHz tone @ 3KHz deviation, -60dBm. Volume set to rated audio.
Trace 1 - IRQB @ DSP (8KHz)
Trace 2 - SD0 @ C412 on Command Board
Trace 3 - SPKR_LOW Out of U450
Trace 4 - SPKR_HI Out of U450
Note 3: Actual level is dependent upon volume setting.
Tek stopped: 507 Acquisitions
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1
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Ch2
Ch1 5.00V 500mV
Ch4
300mV 100mV
Ch3
W8: Transmit Audio. 1KHz Tone
which provides 3KHz deviation.
Trace 1 - IRQB @ DSP (8KHz)
Trace 2 - MODIN
Trace 3 - MIC @ node P502/R415
Trace 4 - MAI @ U406
Ch1 Freq
7.9118kHz
Low signal
amplitude
M 200us Ch1 2.20 V
3
MAEPF-26077-O
Ch1 Freq
7.9872kHz
Low signal
amplitude
M 200us Ch1 1.5 V
MAEPF-26078-O
6-5
September 5, 2008