[TenTec] Recalcitrant Orion

Tue Aug 9 22:02:22 EDT 2016

I am trying to follow the A/B select line from the switches to the CPLD.

The schematic of the pushbutton designates ROW 1 through 5, with ROW5 carrying the logic from the A/B switch to the CPLD.

The schematic of the CPLD board shows only ROW 0 through ROW4 inputs. 

Do you suppose the draftsperson(s) at Ten Tec made an error on one of the two schematics, resulting in this disagreement?

This kinda makes logic flow hard to follow but, if that is true, then the A/B signal would thus appear to be directed towards pin 109 of the XC95288XL CPLD.

This data line is the only one that involves an extended press of a given button to bring about performance of a task. All the others are instantaneous. This  is also the only button that has layered tasks, one instantaneous, the other with a 2 second press.

That may also be a hint as to how the CPU handles this button’s input.

I noticed some other schematic errors so far, mostly on the button board. I wonder if the draftsperson for this board was having a bad day...

Gary

> On Aug 6, 2016, at 11:31 AM, Katz Ajamas <ajamas.rn at gmail.com> wrote:
> 
> Replacing all the caps! No Way!. Maybe testing a few.
> If you have dual trace scope with trigger, you can look to see if the CPU is resetting. If not, I would suspect this small circuit. Note the timing admonition on the schematic!
> 
> Copy attached.  Let us know. My 565 still needs repair!
> 
> 73, -Bob
> 
>  
> > On Aug 5, 2016, at 11:09 AM, Katz Ajamas <ajamas.rn at gmail.com <mailto:ajamas.rn at gmail.com>> wrote:
> >
> > So what was wrong? CPU power on reset problem? Please share.
> > 73, -Bob ah7i
> > _______________________________________________
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> > TenTec at contesting.com <mailto:TenTec at contesting.com>
> > http://lists.contesting.com/mailman/listinfo/tentec <http://lists.contesting.com/mailman/listinfo/tentec>
> 
> 
> 
> ------------------------------
> 
> Message: 5
> Date: Fri, 5 Aug 2016 22:47:32 -0500
> From: Gary J FollettDukes HiFi <dukeshifi at comcast.net <mailto:dukeshifi at comcast.net>>
> To: Discussion of Ten-Tec Equipment <tentec at contesting.com <mailto:tentec at contesting.com>>
> Subject: Re: [TenTec] Orion II repair
> Message-ID: <0141B9C2-28C8-4211-BE27-3DA03028E199 at comcast.net <mailto:0141B9C2-28C8-4211-BE27-3DA03028E199 at comcast.net>>
> Content-Type: text/plain; charset=utf-8
> 
> To clarify, for the more well advance EE?s out there, what I called an I/O controller is actually a complex programmable logic device (CPLD).
> 
> It is, however, so far as I can tell, acting as traffic cop for the CPU.
> 
> Gary
> 
> 
> > On Aug 5, 2016, at 10:19 PM, Gary J FollettDukes HiFi <dukeshifi at comcast.net <mailto:dukeshifi at comcast.net>> wrote:
> >
> > I still don?t know.
> >
> > Here is an update o the rather strange behavior:
> >
> > I already swapped power distribution board, button board and CPU board. A different CPU board operates properly in the radio. perfectly.
> >
> > Here is the sequence:
> > 1) Cold startup  normal boot up sequence, receives signals, none of the encoders except VFO?s work, none of the pushbuttons work.
> > 2) Connect to N4PY software and connect, most functions work but not necessarily correctly. Tuning rate is very slow and some buttons do not do  what they should.
> > 3) Shut down for maybe 30 minutes.
> > 4)  Cold startup  normal boot up sequence, receives signals, none of the encoders except VFO?s work, none of the pushbuttons work.
> > 5) Wait 15 minutes, everything works fine.
> > 6) Shut down for maybe 30 minutes.
> > 7)  Cold startup  normal boot up sequence, receives signals, none of the encoders except VFO?s work, none of the pushbuttons work.
> > 8) Wait 15 minutes, everything works fine.
> >
> > Now, if I operate the encoders while the radio is ignoring them, then wait out the 15 minutes, the radio responds just as if I had just taken those actions. That is, if I turn the volume down while the radio is not responding, the volume will drop once the radio starts working. Ditto for all other encoders. So data is getting to the I/O controller, just not being sent to the CPU. In this state, the actions of pushbuttons are NOT saved, however.
> > One thing that is different about the VFO encoders, both of which always work, and the 6 small encoders is that the VFO encoders are pull high devices operating from the R5 volt supply. The 6 small encoders are pull down devices with outboard pulp resistors also operating from the R5 volt supply.
> >
> > If I operate the encoders in the first fractions of a second after boot up, before the S meter makes is normal bump swing to the right, the encoders work but stop working after that bump.
> >
> > The delay to normal operation is pretty repeatable. It acts as if there is a high resistance somewhere and a capacitors is charging up to enable the CPU to see data that is in the I/O controller.
> >
> > I really doubt that this is a thermal issue or a CPU or I/O controller issue. I am contemplating simply replacing all of the capacitors on the CPU board.
> >
> > Gary
> >
> >
> >
> >> On Aug 5, 2016, at 11:09 AM, Katz Ajamas <ajamas.rn at gmail.com <mailto:ajamas.rn at gmail.com>> wrote:
> >>
> >> So what was wrong? CPU power on reset problem? Please share.
> >> 73, -Bob ah7i
> >> _______________________________________________
> >> TenTec mailing list
> >> TenTec at contesting.com <mailto:TenTec at contesting.com>
> >> http://lists.contesting.com/mailman/listinfo/tentec <http://lists.contesting.com/mailman/listinfo/tentec>
> >
> <Power on reset main board..png>