PLAN B analog blog

>
> --- 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
> >
>

>
> 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 
> <mailto:PLAN_B_analog_blog%40yahoogroups.com>, "meic1965" <meic.kluge@...>
> wrote:
> >
> > --- In PLAN_B_analog_blog@yahoogroups.com 
> <mailto:PLAN_B_analog_blog%40yahoogroups.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
> > >
> >
>
>