[TenTec] Paragon problem

[waltk8cv4612amos at att.net]

I do believe in that era the little plugs were not soldered onto the 
interconnecting board wires but just pushed into the connectors. DANGEROUS ! 
Some times they need to be pushed on very gently with a very small screw 
driver. We used to have back plane troubles in the rear of T carrier panels 
at the telephone company and some times that was the fix. Be careful, this 
can get DANGEROUS ! You can cause more trouble than you clear if you are NOT 
CAREFUL !!

Walt K8CV Royal Oak, MI.

----- Original Message ----- 
From: "Ken Brown" <ken.d.brown at hawaiiantel.net>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Wednesday, August 08, 2007 1:44 AM
Subject: Re: [TenTec] Paragon problem


>
>> The number keypad will not do anything. The filters (all are installed) 
>> is stuck on 2.4.
> On my Paragon the filter selection keys are blue. Mine is a Paragon II
> though. If all my blue keys worked, it would not be stuck on 2.4 kHz.
>> The mode is stuck on LSB. RX offset does not work, but TX offset does. 
>> All the "blue" keys work. All the knobs function. The VFO works, and the 
>> RX seems to be fine and the TX works, too. I tried the reset button on 
>> the right side to no avail and made sure I had not done a global lock. Of 
>> all the black buttons around the VFO knob, only the "fast" button works. 
>> Any ideas??
>>
> Look at the schematics and see what is common to most of the keys that
> do not work. I suspect that a bunch of the keys are connected in a
> matrix, like in the Paragon II, where 44 keys are in a 4 X 11 matrix.
> That way it only requires 15 wires from the board the keys are on to the
> logic or other board that they connect to, instead of 45 wires. And
> there are other keys which are not really part of a matrix and have
> individual leads to each key. The keys in the matrix are probably stuck
> and the non-matrixed keys still work. If that is the case, then you have
> to find out what is the fault in the matrixed keys, something like a
> stuck key locking up the whole matrix scanning scheme, or a bad chip.
>
> I'll bet if you just get inside an clean and exercise connectors the
> problem will go away.
>
> DE N6KB
>
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