Emax

Thanks for your help. Here are the readings:

OR/GR = 12.48V
YE/GR =  5.0V
PU/GR = 12.18 (if i measure with red probe on green wire and black probe on
the purple) or -12.18V (if I measure with the red probe on the purple and
black probe on the green)

The floppy drive works perfectly...it loads the OS and and samples/presets.

I appreciate your time.

Preslav

On Fri, Feb 5, 2010 at 7:17 PM, jammie <jammie.emma@...> wrote:

>
>
>
> test each wire conection
>
> orange and green wires red probe on the orange black probe on the green for
> +12v
>
> yellow and green wires red probe for yellow wire black probe on the green
> wire for +5v
>
> purple and green wires red probe on the green wire black probe on the
> purple wire for -12v
>
> test this for me and give me your readings
>
> does the floppy drive work as this is the 5v line
>
> the 5 v on the mother boards for other circuits gets its 5v from power
> regulators of the +12v supply
>
> ----- Original Message -----
> From: preslavl
> To: emax@yahoogroups.com <emax%40yahoogroups.com>
> Sent: Friday, February 05, 2010 9:37 PM
> Subject: [emax] Re: Emax Problem Diagnosis
>
> So I tried testing the voltages at the connector that goes between the PS
> board and the CPU Board. I tested on the PS side. If I follow the color
> coding I read in a message on here somewhere: Yellow (+5V), Orange (+12V),
> Purple (-12V), and Green (0V/Ground).
>
> I get nowhere near those voltages...now I might be doing this completely
> wrong, but I get +12V at the Green wire, and 0v at the Yellow (where I
> should be getting +5V). I also get +17V at the Orange wire...
>
> Again, I'm not sure if I'm testing at the correct points. By the way I'm
> still getting sound out of the Emax so it has not exploded in my hands as of
> yet.
>
> --- In emax@yahoogroups.com <emax%40yahoogroups.com>, "jammie"
> <jammie.emma@...> wrote:
> >
> > right the cv (control voltages for the filter cutoff vca and resonance
> are sent by the cv circuit ranging from 0v-5v
> >
> > which is sent by the cpu for control off the filter depending on envelope
> settings or external controllers
> >
> > now the ssm2300 are sample and hold circuits they send out the digital
> info into analog voltages which are sampled then transmitted as a voltage in
> the range of 0-5v 0v = 0 resonance 5v = full resonance
> >
> > or cut off or vca volume
> >
> > thats what the first 3 ssm2300 deal with
> >
> > the 4th ssm2300 deals with the digital signal comming from the dacs this
> is the samples that are transmitted from the ram to the dacs and to the
> samplre and hold circuits which send out voltages 0-5v which corispond to
> the digital sound into analog format
> >
> > now if you are getting sound out then the ssm2300 for that part of the
> circuit is working it seems to be the cv circuit that you are having a
> problem with not being sent into the ssm2300 to be made into the analog
> control voltages
> >
> > ----- Original Message -----
> > From: preslavl
> > To: emax@yahoogroups.com <emax%40yahoogroups.com>
> > Sent: Friday, February 05, 2010 7:18 PM
> > Subject: [emax] Re: Emax Problem Diagnosis
> >
> >
> >
> > Let me make sure I understand you correctly:
> >
> > What you describe is one test: checking that the 2300s are getting the
> correct voltage from the 5v supply? And I should be getting +/- 12V and
> ground? Are there testpoints visible or is it pretty obvious where to test
> it?
> >
> > Thanks for the quick reply
> >
> > --- In emax@yahoogroups.com <emax%40yahoogroups.com>, "jammie"
> <jammie.emma@> wrote:
> > >
> > > check the 5 v supply as this is the control voltage of the filters
> > >
> > > the cv control gets sent to 1 of the 2300 for fc 1 for resonance 1 is
> for the vca and thhe other is for the dacs for the 8 note polyphony each
> octal sample and hold circuits for each of the functions
> > >
> > > check to see that you are getting the corect voltage for operation of
> the 2300 or 4051 or smp08
> > >
> > > if i was to change them then i would upgrade them to the newer faster
> slew rate the smp08 are the best and are from analog devices and are direct
> replacements for the ssm2300 which are 4051 equivelents made by emu
> > >
> > > the smp08 they have a faster slew rate and have faster transient
> response with less distortion
> > >
> > >
> > > you should be getting 12vdc vdd and grnd
> > >
> > > ----- Original Message -----
> > > From: preslavl
> > > To: emax@yahoogroups.com <emax%40yahoogroups.com>
> > > Sent: Friday, February 05, 2010 5:54 PM
> > > Subject: [emax] Emax Problem Diagnosis
> > >
> > >
> > >
> > > Hello,
> > >
> > > I wanted to see if I can get some help diagnosing the problem(s) of an
> Emax I i just purchased.
> > >
> > > Here are they symptoms:
> > >
> > > - No Frequency Cutoff - I calibrated the data slider and it registers
> the frequency cutoff (FC) going up in numbers but you cannot hear any
> change.
> > >
> > > - No Attack in the ADSR or the filter ADSR - cannot hear an increase in
> attack even when the values increase.
> > >
> > > - No Volume - volume slider was calibrated and it seems to work but
> moving it up or down does not make a difference...volume seems to be at
> 100%.
> > >
> > > These are pretty much all the symptoms I've notices so far.
> > >
> > > Things I've covered so far:
> > >
> > > - I replaced the 4 SSM 2300 that were in the sampler - it did not seem
> to make ANY difference. I replaced the original chips with ones marked:
> "SSM2300 8652". I purchased these on eBAY. Could this be the issue?
> > >
> > > - I went through the recalibration procedure - no change.
> > >
> > > - I performed the diagnostic tests inside the Master menu (8, 8, YES).
> ERAM and Bank RAM checked out OK and all other tests seemed to have passed.
> > >
> > > Any ideas anyone?
> > >
> > > Thank you,
> > >
> > > Preslav
> > >
> > >
> > >
> > >
> > >
> > >
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