Xpantastic!

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

--- 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
> >
> >
> > .
> >
> >
>

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
>> >
>> >
>> > .
>> >
>> >
>>
>
>

Hi,

"Take a look at 265-2906 (RS Components code). This is a horizontal, endless rotary encoder 
with 30 stops/15 impulses. I think it's quite the same of the Xpander ones..."

See the Link page in this forum or try directly this link:
http://fi.rs-online.com/web/search/searchBrowseAction.html?
method=searchProducts&searchTerm=265-2906&x=19&y=10

Best wishes,
Tiitu.

The address was cut in two parts, so please copy both parts on your address bar!



--- In xpantastic@yahoogroups.com, "envia94" <akva@...> wrote:
>
> Hi,
> 
> "Take a look at 265-2906 (RS Components code). This is a horizontal, endless rotary 
encoder 

> with 30 stops/15 impulses. I think it's quite the same of the Xpander ones..."
> 
> See the Link page in this forum or try directly this link:
> http://fi.rs-online.com/web/search/searchBrowseAction.html?
> method=searchProducts&searchTerm=265-2906&x=19&y=10
> 
> Best wishes,
> Tiitu.
>

Hi 
This looks like it could work but you would have to make the leads 
longer, because the original is much larger. You would need to see 
the electrical pinout to be sure. 

--- In xpantastic@yahoogroups.com, "envia94" <akva@...> wrote:
>
> Hi,
> 
> "Take a look at 265-2906 (RS Components code). This is a 
horizontal, endless rotary encoder 
> with 30 stops/15 impulses. I think it's quite the same of the 
Xpander ones..."

> 
> See the Link page in this forum or try directly this link:
> http://fi.rs-online.com/web/search/searchBrowseAction.html?
> method=searchProducts&searchTerm=265-2906&x=19&y=10
> 
> Best wishes,
> Tiitu.
>

Hi, I just fixed all the rotary encoders on my Xpander in about 1 
minute. The symptoms were that the values were jumping around, 
wouldn't go up unless you went slow, if you went too fast they did 
nothing or went backwards!

I simply sprayed a touch of Servisol Switch Cleaning Lubricant in the 
round hole on the side of each encoder(you have to remove the plastic 
covers). It worked immeadiately and now they are all working 
perfectly, good as new. Sweet!

Phil.





--- In xpantastic@yahoogroups.com, PeWe <ha-pewe@...> wrote:
>
> 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
> >
> >
> > .
> >
> >
>

HI phil, let us know if they keep working ok, I have heard that they will 
work for a while after cleaning like that but then will be worse later...I hope 
not   cya analoguejeff

Sure I will...it is always a risk spraying cleaners into things. Thats 
why I named the exact brand. The thing is I couldn't live with them 
like that so I took the risk, it was a last ditch before replacement. 

But anyway the fix was instant and on the face of it perfect. We'll see.

Phil.

--- In xpantastic@yahoogroups.com, vco3@... wrote:
>
> HI phil, let us know if they keep working ok, I have heard that they 
will 
> work for a while after cleaning like that but then will be worse 
later...I hope 
> not   cya analoguejeff
>

Servisol Super 10 Switch Cleaning Lubricant is what it says on the 
can. PS: hey are still working perfectly :o)


--- In xpantastic@yahoogroups.com, PeWe <ha-pewe@...> wrote:
>
> Wow,- interesting. Simplest fix on earth,- I´m curious about the 
> long-life cycle of such a solution.
> I remember a service tech opened the rotarys and used compressed 
air and 
> spray (don´t no which !) for cleanig and that didn´t help. So, it 
> eventually depends on the cleaner.
> Is it Servisol Super 10 Switch Cleaner, Super 40 lubricant or 
which ?
> 
> PeWe
> 
> 
> eggwheatis schrieb:
> >
> > Hi, I just fixed all the rotary encoders on my Xpander in about 1
> > minute. The symptoms were that the values were jumping around,
> > wouldn't go up unless you went slow, if you went too fast they did
> > nothing or went backwards!
> >
> > I simply sprayed a touch of Servisol Switch Cleaning Lubricant in 
the
> > round hole on the side of each encoder(you have to remove the 
plastic

> > covers). It worked immeadiately and now they are all working
> > perfectly, good as new. Sweet!
> >
> > Phil.
> >
>