The recommendation to recap the A9 board is still a good one.
I have personally witnessed and Orion operating correctly sometimes and not
other times and completely repaired the radio by replacing those capacitors.
The reason this is so important in this model is that the 5 volt logic power
supply on the A9 board is a switching supply. If a capacitor in that supply is
defective (either low in value or showing leakage) the switching supply carries
lot of noise, and can actually be quite low in voltage which really confuses
the CPU during boot cycle and unpredictable things happen.
Gary
W0DVN
> On Dec 16, 2019, at 1:05 PM, Enzo via TenTec <tentec@contesting.com> wrote:
>
> Thank you all for the quick answers!
>
> This evening when back home, I was ready to open covers and take a look
> inside the Orion, but before doing that, I switched it on and, with my
> surprise, the noise heard from the speaker was different. So, after having
> set the correct display contrast, I tried to listen to the 20m band it was
> busy! Then, I tried change the band, mode, transmission... the Orion seems
> fully alive again! Nothing has been changed from yesterday, but today it
> works. Since I don't believe in miracles, I wonder what went on? I'll check
> it in every function, but it seems fine.
>
> 73 de Enzo, IK3SWB
>
> Il 15/12/2019 21:27, Bill Cotter ha scritto:
>> Enzo,
>>
>> My Orion-II had exactly the same symptoms, on a couple of occasions. The
>> master resets helped for a while, then the same problem came back. Looking
>> at the DC power cable connector, it was fine. So, I opened it up.
>>
>> The first thing I did was to replace ALL the electrolytic capacitors on the
>> A9 power supply board with high-quality 105C capacitors. I then checked both
>> batteries (CPU & AT), and replaced them. The last thing I did was to DeOxit
>> ALL connectors in the radio (quite a job). It has never had a problem since.
>>
>> 73 Bill N4LG
>>
>>
>> At 12:10 PM 12/15/2019, you wrote:
>>> Hallo everyone,
>>>
>>> I'm a happy owner of a Orion since 2005. Today, while it was transmitting
>>> my home energy was suddenly interrupted. After switching the RTX on, it
>>> started behaving in a strange way: both VFO seems ok but no band reception;
>>> only the buttons around the display are active, the others don't work; no
>>> transmission. I performed a Master Reset and then a Ram Clear (followed by
>>> a master reset). Now it switch on, the volume goes up an down, some noise
>>> comes out from the speaker, but the 20m are silent, only electronic noise.
>>>
>>> Is there any clue to bring it alive again?
>>>
>>> Thanks and 73 de IK3SWB, Enzo.
>>>
>>> _______________________________________________
>>> TenTec mailing list
>>> TenTec@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/tentec
>>
>> _______________________________________________
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>>
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