Hello Dave,
I suggest you post this message to the Yahoo Alpha 87A group where
Alpha techs can see it:
https://groups.yahoo.com/neo/groups/Alpha87a/info
I've CCed this message there.
Best regards,
Larry
WB6BBB
On Tue, 30 Jul 2019 11:37:14 -0400, Dave <rocketnj@gmail.com> 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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