PLAN B analog blog

30 Euro to mail a padded envelope?  woah.

All you have to do is pull the component, stick it in a small piece of
IC tubing (you can get this at any Electronics store - they probably
won' charge you for a lttle piece). Tape off the ends to it won't fall
out, and then put that in a padded envelope.  If in fact it's that
much, I'l just send you one without the replacement, but I would like
the original back, even if it's maailed slow boat.

I could send you the hex file, but you need a programmer specifically
for the AT80C2051 micro-processor.  If yu have one, cool.  If not,
they run more than 30 Euro usually. 

First, you need to determine if yours is in fact one that has the bad
code.  Verify whether or not your SELECT VC doesn't respond as listed
in figure 2 of the MOdel 28 page on the EAR site. THe only difference
is the order - the voltages - that need to be applied at the SELECT
input to the the different notes out.  They are till all available,
just not in that order.  I will send the turth tables in another post
in a second.

- P







--- In PLAN_B_analog_blog@yahoogroups.com, "meic1965" <meic.kluge@...>
wrote:
>
> --- In PLAN_B_analog_blog@yahoogroups.com, "(i think you can figure
> that out)" <peter@> wrote:
> >
> > All,
> > 
> > We have discovered an error in the programming of the Model 28 Tapper.
> >  There's a fix - please read on.
> > 
> > There are two input pins on the microprocessor which determine which
> > of the three SERIAL output states (quarter note/eight/triplet) are
> > passed through.  These are fed by two external window comparators. One
> > input gives indication that the voltage at the SELECT INPUT is over
> > 2.5 volts, one if it's between 2.5 and 5.5 volts.
> > 
> > Well, there was a mis-communication and it seems either I told my
> > programmer the pins in the wrong order, or he reversed it - that
> > doesn't matter - the issue is they are reversed in the first 15 units
> > shipped.  Everything does it's thing - but because the info the micro
> > receives is not coded correctly, the voltage levels required to do
> > that decoding are not as outloined in our spec sheet.
> > 
> > I do not have a database of who purchases our products from our
> > dealers.  What I am asking you to do is test this function and if it
> > is determined that they do NOT behave as outlined in the M28 product
> > page on our site, that you return U1 -- the 20 pin dip IC labeled
> > either ATMEL AT89C2051-12 or -24 to us and we will reprogram it and
> > send it back immediately.  There are letters after the -12 and -24 -
> > those don't matter, U1 is the bugger that need to be reprogrammed.
> > 
> > The part can easily be removed from it's socket through the use of
> > either a chip-puller or a small flat-blade screwdriver.
> > 
> > The address to send that is:
> > 
> > Electro-Acoustic Research
> > 10870 Camarillo St.
> > Toluca Lake, CA
> > 91602
> > 
> > Please pardon this error, we wil do everything required to get you
> > back on the road as quickly as possible.
> > 
> > - P
> 
> Is it possible to do it by myself. I am located in germany and the
> shipping will be nearly 30 €.
> 
> Greetz from Hamburg
> >
>