This is interesting. Please keep us informed.
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Wes Attaway (N5WA)
(318) 393-3289 - Shreveport, LA
Computer/Cellphone Forensics
AttawayForensics.com
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-----Original Message-----
From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of Gary J
FollettDukes HiFi
Sent: Monday, August 08, 2016 10:29 PM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] Orion II repair
There is some new information.
The A/B switch, when held for 2 seconds, is supposed to change the "A" or
"B" on the display and this in turn makes the band select buttons select the
band directly. It is supposed to default to "A" I think. Mine defaults to
"B".
If I wait the 15 minutes, and the encoders start to work, I can use the A/B
to select "A" but upon restart, the default becomes "B", which is incorrect.
I think the 15 minutes, a rather consistent number, may be a timeout for the
interrupt lines.
It would appear that something is pulling the A/B switch line low, but it is
not the switch itself. The switch works fine once the timeout takes place.
I am now looking at the 74HC154 4-to-16 line decoder/demultiplexer.
More to come.
Gary
> On Aug 8, 2016, at 3:29 PM, Stuart Rohre <rohre@arlut.utexas.edu> wrote:
>
> Gary, before you shotgun all the capacitors, look at all the solder joints
for the affected boards with a high intensity light, and a magnifier. A head
mount magnifier with light may work, but I often use and independent high
intesity Halogen light we bought for troubleshooting.
>
> I am betting on one or more bad solder joints. How old is this radio? Are
you the first owner?
>
> Stuart Rohre
> K5KVH
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