9
cycled independently, then a 500 Hz tone will be heard independent of how the
configuration jumpers are set.
Audio Circuitry Test
This test uses the DSP-9 audio output to generate an audio test tone that can be
looped back into the audio input to check the audio levels in the DSP-9.
1. With the DSP-9 powered up and a tone audible at the speaker, disconnect the
speaker from the DSP-9.
2. Loopback the audio output of the DSP-9 to the audio input using an RCA phono to
RCA phono cable.
3. Adjust the DSP-9 volume control to approximately the 11 o'clock position. The
normal LED on the DSP-9 front panel should be on.
4. Increasing the volume control to approximately the 12 o'clock position should like
the overload LED.
5. If the LEDs do not operate in a manner consistent to that noted in steps 3 and 4,
there may be some problem with the loopback cable or in the audio circuitry of the
DSP-9.
Ending the DSP-9 Self-Test
1. Power down the DSP-9.
2. Disconnect audio loopback cable.
3. Restore configuration jumpers to preferred operating options.
4. Put back panel and rear bezel back on the DSP-9 housing. (Don't forget the star
washers over the RCA phono connectors.)
5. Install the DSP-9 into your station per the installation recommendations in this
manual.
"Normal" LED does not flash on audio peaks
.
Check power connection to DSP-9.
Check audio input connections.
Bypass the DSP-9 and verify the audio level out of the radio by monitoring the
speaker.
"Overload" LED flashes on audio peaks
.
Check power connection to DSP-9.
Reduce audio input level with receiver audio output level control
No audio output
Check power connection to DSP-9.
Check audio input connections.
Increase audio input level with receiver audio output level control
Check audio output (Audio Output and headphone) connections.
Check audio output device (speaker or headphone).
Turn front panel audio level control clockwise.
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