Emax

Jammie,

Sorry for the delay. Got the readings:

*IC41: *

I have +10V on pin8, and -12V on pin4.

*IC49:*

I have +5V on pin 14

*SSM2300s:*

On all 4 I consistently have the following readings:

pin 7 = -4.87V, pin 16 = +10.0V, pin 3 = 0.00V


Any other ideas? You mentioned I should be getting 0-5V on pin 3 from the CV
voltage on all ssm2300s...how can I test that the voltage goes up to 5v
since now it stays at 0.00v?


Thanks,

Preslav




On Sat, Feb 6, 2010 at 4:04 PM, jammie <jammie.emma@...> wrote:

>
>
> no pins 8 +10v
> pins 4 -12v are of off the tl082 ic41
>
> pin 3 gnd
> pin 14 +5v are from the ic49 ad7524
>
> i said use pin 3 ground as your reference ground for testing the pins on
> the
> tl082
>
> pin 3 on the ssm2300 is the cv voltage check this to see if you are getting
>
> the cv 0-5v
>
> the rest of the pins for the ssm2300 are correct
>
> ----- Original Message -----
> From: "Preslav Lefterov" <plefterov@... <plefterov%40gmail.com>>
> To: <emax@yahoogroups.com <emax%40yahoogroups.com>>
> Sent: Saturday, February 06, 2010 8:14 PM
> Subject: Re: [emax] Re: Emax Problem Diagnosis
>
> > 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@... <jammie.emma%40blueyonder.co.uk>>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><plefterov%
> 40gmail.com>>
> >> To: <emax@yahoogroups.com <emax%40yahoogroups.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>
> <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> <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> <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> <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> <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> <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]
> >
> >
> >
> > ------------------------------------
> >
> > 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: 271.1.1/2671 - Release Date: 02/06/10
> 07:35:00
>
>  
>


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