Emax

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 
  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, "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 
  > 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, "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 
  > > 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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  > > 
  > > 
  > > No virus found in this incoming message.
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  > > Version: 8.5.435 / Virus Database: 271.1.1/2669 - Release Date: 02/05/10 07:35:00
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  > >
  > 
  > 
  > 
  > 
  > 
  > 
  > ----------------------------------------------------------
  > 
  > 
  > 
  > No virus found in this incoming message.
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  >



  


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  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]