Emax

nothing wrong with the psu voltages are correct

right the 4 ssm2300

are like this i looked at the schematic they are as follows

ssm2300 1 is the cv for pan for voices 1-8

ssm2300 2 is for the vca envelope for voices 1-8

ssm2300 3 is for q for voices 1-8

ssm2300 4 is for filter envelope cv

they are feed by a latching circuit a 74hct273 this circuit controls the 
amount of cv data to each of the outputs by controlling the sample and hold 
circuits this is feed by data buss that feeds the dac

main data buss feeds the ad 7524 8 bit cv dac which goes to each of the 
ssm2300 com check this dac out put that you are getting cv voltage 0-5v

ic49 ad7524 cv dac has 2 outputs that go to an opamp ic41 tlo82 check 
voltages on this ic pin 8 is +10v

pin 4 is -12v

ic49 cvdac pin 3 is gnd use this pin for you gnd reference for testing the 
voltages also check pin 14 which is +5v

the output pin 1 on the ic41 tlo82 is the cv dac output to all the ssm2300 
sample and hold ic,s check the voltage it should be 0-5v

check the voltage on the ssm2300 pin 7 is -5v pin 8 is grnd ov and pin 16 is 
+10 volts

so there must be a -5v regulator feeding the sample and hold circuits 7905 
power regulator which is feed by the -12v psu line plus the should be a +10v 
regulator 7810 for the +10v this comes from the +12v psu supply line

also have you treid a filter and vca recalibration this uses the cvdac to 
calibrate all filters and vca so that all 8 voices are in sync
----- 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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>> > >
>> > >
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>> > >
>> > > [Non-text portions of this message have been removed]
>> > >
>> >
>> >
>> >
>> >
>> >
>> >
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>> >
>> >
>> >
>> > No virus found in this incoming message.
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>> 07:35:00
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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
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>>
>>
>
>
> [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