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Re: [Amps] Alpha 87A fault 33 when pressing TUNE DOWN

Subject: Re: [Amps] Alpha 87A fault 33 when pressing TUNE DOWN
From: Larry Dighera <>
Date: Thu, 01 Aug 2019 10:48:24 -0700
List-post: <>
Hello Dave,

I suggest you post this message to the Yahoo Alpha 87A group where
Alpha techs can see it:

I've CCed this message there.

Best regards,

On Tue, 30 Jul 2019 11:37:14 -0400, Dave <> wrote:

>Hi all
>Looking at an old 87A for a friend. 
>This is a 91xxx s/n without AlphaMax and NO updates done to amp. 
>Originally faulting with fault 8. Replaced bad RX PIN diodes with 1N4007 
>diodes and TX PIN with pair of UM4006D. No more fault 8. 
>Now whenever you press TUNE DOWN it immediately faults with fault 33. (Tune 
>motor failed to initialize).
>Another clue is on power up both Load 
>LEDs flash but only the TINE UP LED flashes twice. (Tune down does not flash). 
>But Tune Down LED does light when pressing Tune Down. 
>Any ideas appreciated   
>Dave wo2x
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