Jerry,
If you have a scope, look at pin 2 of U11 while you turn the rig on.
There should be a reset pulse. This is generated by C31 and R45. If C31
dries out, the pulse may not be strong enough to "kick-start" the audio DSP.
Phil C. Sr.
k4dpk
----- Original Message -----
From: "Ralph Jerald 'Jerry'Volpe" <kg6tt@sonic.net>
To: <tentec@contesting.com>
Sent: Thursday, May 13, 2010 12:49 PM
Subject: [TenTec] Malfunction in Omni-VI,opt 3. Have you experienced this
one?
> This morning when I turned my Omni-VI, opt 3 on it came up in CW, key
> down transmitting. Cycled off and on and the repeat malfunction.
> Isolated all connections and problem continued.
>
> Performed basic RESET and transceiver went to 14.000, USB, clock reset
> to 12:00. But no apparent audio output. From meter indication I could
> see that the receiver was working. Inserted headphones and with volume
> advanced full I could must barely perceive stations. BUT none of the
> keypad buttons function.
>
> Performed Master RESET and the malfunction remains the same.
>
> Note: If holding down any keypad key during start up you hear full audio
> output until you let go that button... then clock begins and audio
> becomes muted and no keypad buttons function. Although with headphones
> on you can hear a stream of fast pulses when any key is depressed.
>
> VFO functions fine but of course you can't change bands, modes, etc.
>
> Removed the cover and did a slight manipulation of all connections on
> the Logic board. No change.
>
> There is a start up initialization sequence. Unless I miss my guess the
> malfunction is causing this sequence to not go beyond displaying the and
> running the clock.
>
> This is as far as I've gone at present.
>
> This is a very clean Omni-VI, opt 3. No apparent corrosion whatsoever.
> Only previous malfunction was a bad MAX232 chip. That was replaced and
> transceiver has worked flawlessly till today.
>
> Most certainly the problem is on the Logic Board due to the issues
> presented. Beyond that, and before I tear into it.... have you
> experienced this error? If so what was the eventual fix?
>
> 73,
>
> Jerry, KG6TT
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