Emax

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@...>
To: <emax@yahoogroups.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@...> 
> 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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>> > > Checked by AVG - www.avg.com
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>> 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