Thanks Kent, I really appreciate your offer of help sir!
OK this is gonna be kind of difficult to explain...
I'll call the lowest C- C1 and the highest C- C6.
Here goes...
C1, Eb1, F#1, A1, C2 ... all at full AT.
The notes in between these have no AT.
C#2 > F#2 .. all OK
G2 > C4 are behaving now an then "intermittently".
C#4 > F#4 .. all OK
G4 > C6 .. all have no AT
There is a weird anomally though....
When I press any of the intermittent keys when they are working, and
then I press one of the full AT keys at the same time it makes the
ones that are working (the intermittent one), STOP working.
And the other way, if I hold down a full AT key and press one of the
intermittent ones at the same time, the full AT disappears, cuts off
to nothing. This must be a clue...?
I checked all my soldering - was the first thing I looked at with a
magnifying glass and there are no visible joins. My soldering is quite
good as I went to college years ago and passed some electronics courses.
BTW Kent, when you mentioned the AF board you mean the small one to
the left of the keyboard assembly I asume? I think I avoided it (I'll
double check) - but anyway this problem seems strange in that
everything was working just fine for a day or two after I did all the
work. This all happened this morning.
Thanks again Kent,
And thanks to all of you who replied as well.
Tom
OK this is gonna be kind of difficult to explain...
I'll call the lowest C- C1 and the highest C- C6.
Here goes...
C1, Eb1, F#1, A1, C2 ... all at full AT.
The notes in between these have no AT.
C#2 > F#2 .. all OK
G2 > C4 are behaving now an then "intermittently".
C#4 > F#4 .. all OK
G4 > C6 .. all have no AT
There is a weird anomally though....
When I press any of the intermittent keys when they are working, and
then I press one of the full AT keys at the same time it makes the
ones that are working (the intermittent one), STOP working.
And the other way, if I hold down a full AT key and press one of the
intermittent ones at the same time, the full AT disappears, cuts off
to nothing. This must be a clue...?
I checked all my soldering - was the first thing I looked at with a
magnifying glass and there are no visible joins. My soldering is quite
good as I went to college years ago and passed some electronics courses.
BTW Kent, when you mentioned the AF board you mean the small one to
the left of the keyboard assembly I asume? I think I avoided it (I'll
double check) - but anyway this problem seems strange in that
everything was working just fine for a day or two after I did all the
work. This all happened this morning.
Thanks again Kent,
And thanks to all of you who replied as well.
Tom
--- In yamahacs80@yahoogroups.com, "kent_spong" <kent_spong@...> wrote:
>
> Ah welcome to my world!
>
> I got some idea what you might have done here. Tell me what keys
> have no AF and what one's do. I can then tell you what ic's have
> gone if any.
>
> Did you hit the AF connecter board on the top of the psu?
>
> If your geting some notes with full AF you may have joined some legs
> together when putting the 0.1 caps on.
>
> Let us know all the faults and I will help you out as I am working
> right though the Christmas holiday anyway. ( on 80's as always )
>
> KSR
>