MOTM

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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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!
>
>
> 
> ____________________________________________________________________________________
> Fussy? Opinionated? Impossible to please? Perfect.  Join Yahoo!'s user 
> panel and lay it on us. 
> http://surveylink.yahoo.com/gmrs/yahoo_panel_invite.asp?a=7
>
>
>
>
> Yahoo! Groups Links
>
>
>
>

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!
> >
> >
> > 
> >
____________________________________________________________________________________
> > Fussy? Opinionated? Impossible to please? Perfect.  Join Yahoo!'s
user 

> > panel and lay it on us. 
> > http://surveylink.yahoo.com/gmrs/yahoo_panel_invite.asp?a=7
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
>