Emax

Jammie,

Ok let me run through this stuff and make sure I understand correctly (I
should be able to do all the tests later today or tomorrow):

1. SSM2300s are fed by the *74HCT273* latching circuit. Is this the name of
the actual circuit as per the schematics or is it a specific IC or other
component?


2. I need to check the following pins on *IC49 (AD7524): *
*
----> pin 8 should be +10V
-----> pin 4 should be -12V
-----> pin 3 is GROUND
-----> pin 14 should be +5V

3. I need to check the following pins on IC41 (tlo82):
-----> pin 1 should be 0-5V (this is the output to all SSM2300s)

Which pin on IC41(tlo82) is GROUND?

4. I need to check the voltages on these pins on all SSM2300s:

----> pin 7 should be -5V
----> pin 8 is GROUND
----> pin 16 should be +10V

5. ICil327 is the -5V regulator, so if I am nto getting this voltage to the
SSM2300s I can try replacing this?

6. Transistor TIP29 / QQ306 is the +10V regulator. It is attached to a
heatsink ZE323. If I am not getting +10V I can try replacing this
transistor?


Just wanted to summarize your instructions. I will check all this stuff as
soon as I get to the studio (there is a snowstorm here and my car is stuck
currently).


Thank you for guiding me through this again.


Preslav



*

On Sat, Feb 6, 2010 at 10:26 AM, jammie <jammie.emma@...>wrote:

>
>
> the -5v regulator is ic il327
>
> the tip29 npn power transister does the 10v it is qq306 it is attached to
> t0-220 heatsink ze323
>
> ----- Original Message -----
> From: "Preslav Lefterov" <plefterov@... <plefterov%40gmail.com>>
> To: <emax@yahoogroups.com <emax%40yahoogroups.com>>
> Sent: Saturday, February 06, 2010 1:35 AM
> Subject: Re: [emax] Re: Emax Problem Diagnosis
>
> > 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@...<jammie.emma%40blueyonder.co.uk>>
>
> > 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> <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> <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> <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> <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> <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
> >> > >
> >> > >
> >> > >
> >> > >
> >> > >
> >> > >
> >> > > ----------------------------------------------------------
> >> > >
> >> > >
> >> > >
> >> > > No virus found in this incoming message.
> >> > > Checked by AVG - www.avg.com
> >> > > Version: 8.5.435 / Virus Database: 271.1.1/2669 - Release Date:
> >> 02/05/10 07:35:00
> >> > >
> >> > >
> >> > > [Non-text portions of this message have been removed]
> >> > >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> > ----------------------------------------------------------
> >> >
> >> >
> >> >
> >> > No virus found in this incoming message.
> >> > Checked by AVG - www.avg.com
> >> > Version: 8.5.435 / Virus Database: 271.1.1/2669 - Release Date:
> >> > 02/05/10
> >> 07:35:00
> >> >
> >> >
> >> > [Non-text portions of this message have been removed]
> >> >
> >>
> >> ----------------------------------------------------------
> >>
> >> No virus found in this incoming message.
> >> Checked by AVG - www.avg.com
> >> Version: 8.5.435 / Virus Database: 271.1.1/2669 - Release Date: 02/05/10
> >> 07:35:00
> >>
> >> [Non-text portions of this message have been removed]
> >>
> >>
> >>
> >
> >
> > [Non-text portions of this message have been removed]
> >
> >
> >
> > ------------------------------------
> >
> > Emax and Emax II User's Group Website
> >
> > http://www.silveriafamily.comYahoo! Groups Links
>
> >
> >
> >
>
> ----------------------------------------------------------
>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 8.5.435 / Virus Database: 271.1.1/2669 - Release Date: 02/05/10
> 07:35:00
>
>  
>


[Non-text portions of this message have been removed]