I 'touched up' the soldering on U6, and the track/hold and clk solder
joints on the pcb. Everything works perfectly now. Thanks Paul!
--- In motm@yahoogroups.com, "Paul Schreiber" <synth1@...> wrote:
>
> This is one of 2 things:
>
> a) bad solder joint (most likely).
> b) a tiny crack in the pc board trace
>
> The S&H is the LF398 IC U6. It can be the Track/Hold switch
soldering, or
> the wiring on the CLK (J5).
>
> Paul S.
>
> ----- Original Message -----
> From: "loopcycle" <loopcycle@...>
> To: <motm@yahoogroups.com>
> Sent: Monday, October 01, 2007 12:03 PM
> Subject: [motm] funny problem with s&h module
>
>
> > when i screw all four corners down to my stooge rails, the s&h
does not
> > sample.
> > it just holds. if i tap on the front panel with my finger, it
samples the
> > input in time with my fingertaps.
> >
> > i thought this was cool for about 5 minutes, but now i want it to
work
> > right
> > again.
> >
> > if i take a couple screws out, the s&h works normally.
> > so, i think some pressure on the frontpanel must be aggravating a
poor
> > solder
> > joint.
> >
> > instead of touching all the solder points on the board, are there
a few
> > particularly suspect i might go after first? maybe the pots
first? any
> > suggestions welcome, thanks!
> >
> >
> >
> >
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>