Xpantastic!

The fact that the Xpander ICs are in sockets is a bad thing- for
reliability, but great for troubleshooting.

It's highly probable that reseating some ICs may fix some problems,
but they are likely to return in the future, when the contacts between
the IC pins and the socket receptacles get dust/corrosion on them.

You have to be very gentle when reseating IC's so as not to bend/break
pins and crack the circuit board.
(I know you know this Karl, this is for the benefit of the others)


On Wed, Aug 6, 2008 at 4:21 PM, Karl <shire03@sbcglobal.net> wrote:
> --- In xpantastic@yahoogroups.com, PeWe <ha-pewe@...> wrote:
>
> Hi Karl,
> This will be confusing to someone following the post. You can call me
> tsotha if you want. Anyway the good news is, thats exactly how mine
> was acting. It did seem that with use, the problem got better. But in
> the end I replaced the chips and all is good now. Try swaping chips
> with the good encoaders to prove it. If your not a bit head like me, I
> can walk you through it.
>
> Karl II
>
>>
>> Hi Karl !
>>
>> I´m also not sure if my encoders are really damaged. It is, all the
>> switches and the encoders had not been too much in use all the
> time, - I
>> used a Oberheim Bankloader by Jaques Isler for the Atari in the
> past and
>> Sounddiver later after programming and editing and creating sounds
> a lot
>> in the 1st weeks after the purchase of the new Xpander.
>> I´ve found out, switches and the numerical keyboard come back to
> live by
>> using ´em more and again.
>> The rotarys work, 4 of them have no issues and 2 of ´em do all I
> need
>> if I turn ´em carefully and slow,- but I get value jumps if I move
> ´em
>> fast.
>> Do you think it´s more related to the chip or more to dust,- or is
> it
>> common they start to wear out totaly ?
>> I´m also not sure if it´s recommended to open a rotary and trying
> to
>> clean it.
>> Teslanol T6 works pretty good here w/ vintage pots and faders, but
> I
>> don´t know if a rotary is comparable to a pot and how it looks
> inside,
>> so I´m careful and better avoid any experiments I think.
>>
>>
>>
>>
>> Karl schrieb:
>> >
>> >
>> > Hey All,
>> >
>> > I have had a situation where I thought the encoader was acting up.
>> > " display does not react when turning encoader or slow response".
> After
>> > some digging with a scope I discovered its not the encoader at all
>> > but the schmidt trigger chip interfaced to the encoader. This
> part is
>> > available and inexspensive. My guess is static damages the chip.
>> > I don't remember the exact part number but If needs be I can look
> it up
>> > on the schematic. If your not sure, just swap it out with the
> chip from
>> > the encoader next to it and see if the problem moves over.
>> >
>> > Karl
>> >
>> >
>> > .
>> >
>> >
>>
>
>