[TenTec] ORION 2 Model 566 Motor-Boat Pulsing Sound

[Bob McGraw K4TAX]

The capacitors on the A9 board will deteriorate with age and heat to 
lesser effective values of MFD or capacitance.   This causes the various 
regulators associated with the A9 power distribution board not to 
stabilize correctly and will cause initial boot up problems.   
Frequently turning the radio off and then on will allow the voltage to 
stabilize and the microprocessor to load the operating system.   That is 
until next time when one finds that cycling the radio on and off a few 
times to get it up and running.

Also, radios of this age may have intermittent issues due to oxidation 
of internal connectors.   It is a good practice to thoroughly clean all 
connectors once ever 7 to 10 years or so. And the Molex power connector 
on the rear of the radio along with the mating connector on the DC cable 
will loosen and have poor contact.   One can use needle nose pliers to 
carefully tighten the pins, but they will eventually loosen again.    
Look for discoloration on the white plastic/nylon housing of the 
connectors.  Thus replacement of both the male and female connectors is 
suggested.

These radios are relatively easy to repair and keep going for a long time.

73

Bob, K4TAX


On 10/30/2018 9:16 PM, MadScientist wrote:
> As Ten Tec always said (when they cared) was, “Replace all of the capacitors on the A9 power distribution board.
>
> That would be a good place to start.
>
> Gary
>
>> On Oct 30, 2018, at 6:29 PM, W5SJL Amos Favorite <W5SJL at msn.com> wrote:
>>
>> Hello guys this is an intermittent, if you power it down for a while it come back on ok.
>>
>> Can’t tell if it is sourced by one of the receivers or the other since volume control has no effect on the sound. Transmitter power out turned all the way down.
>>
>> Any Thoughts??
>>
>> Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Wi ndows 10
>>
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