Re: EDP problem

[Travis Hartnett <travishartnett@gmail.com>]

You can troubleshoot the footswitch by connecting a multimeter and
reading the resistance values of each switch.  The values are in the
archives and on the LD site.  Cleaning can help, but yes, eventually
they need to be replaced.  They are cheap and available from Mouser
(and others).  That info is also archived/on the site.

What you want to see are steady resistance values when you depress a
switch.  If it jumps around, the EDP gets confused.  Dirty or worn
switches will do this, and you'll probably note that it happens to the
most commonly used switches--Record, Overdub, Next, etc.

Or, you can buy an FCB.  However, it's switches eventually fail also.
I'm not sure that I've seen an easy fix for that.

TH

On Thu, Mar 5, 2009 at 1:05 AM, andy butler <akbutler@tiscali.co.uk> wrote:

>
> According to Kim Flint that the switches were selected by trial for quick
> response time
> to foot taps. Clunky switches (or those with a long travel before 
>contact )
> don't
> help for rhythmic accuracy.
> In the early days of EDP, the switches didn't have much problem.
> I have 2 FC7s which functioned perfectly (well, almost) before going into
> storage,
> but 5 years later they don't work reliably, so I guess that the contacts
> oxidise eventually. The FC7 is designed so that it can be connected with 
>a
> simple guitar lead,
> which is a nice touch, but unfortunately this design also makes the 
>response
> dependent on there being no contact resistance in the switches, even
> momentarily.
> That's why it's common for the FC7 to have switches which call up 
>unexpected
> functions.
>
> So, it's a matter of replacing the switches, perhaps even regularly, for
> reliability.