[sdiy] ENSONIQ MIRAGE DSK service notes manual

[Nathan M. Reeves]

Excellent idea Graham!

The unit works perfect through MIDI!

I hooked up my other Mirage to the MIDI IN and was able to trigger the  
standard "this is a blank formatted diskette" sample that comes on the  
format diskette 8^)

so, its the keyboard with its associated circuitry....

i remember someone posting a thread about how to test a keyboards  
diodes though i hardly think they all went out at the same time but i  
would like to check this first...

how do you check a keyboards diode matrix?  i have a diode icon on my  
radiowack DMM but haven't used it....

assuming the diodes all check out ok, any other ideas on what to  
check?  the keyboard matrix connects to the main board via the 24 pin  
(its actually 26 pins but  pins 25 and 26 are not connected) J3  
connector and this goes to U6, which i am not sure of its function...

i am gonna reseat all ICs that allow this....and might as well check  
all the voltages...

can someone explain to me what happens next after the j3 connector?

how would you "go down the line" for isolating what is not working  
properly?

cheers

nate

On Jan 21, 2009, at 12:15 PM, Graham Atkins wrote:

> Hi Nate,
>
> Have you got another MIDI keyboard that you can use to control  
> it ?....Eliminate the keyboard
> and associated circuitry ?
>
> Graham
>
> On 21 Jan 2009, at 16:35, Nathan M. Reeves wrote:
>
>> ok i got a hold of them and one seems to work fine, the output is  
>> low but not distorted or any artifacts....
>>
>> the other one seems to load fine but when i play on the keys i get  
>> no sound at the output.
>>
>> i will reseat everything to see if that works...
>>
>> maybe the keyboard needs a look at?
>>
>> i noticed in the parameters that there is a local control on/off  
>> option so i will double check that as well!
>> thanks for the schematics and service manual!
>>
>> i think the dsk8 is the 8-bit one and the  plain dsk is the 12-bit?
>>
>> how would one tell from the inside?  which chips are the DACs?
>>
>> cheers,
>>
>> Nate
>>
>> On Jan 20, 2009, at 3:13 PM, Tom Arnold wrote:
>>
>>> On Tue, Jan 20, 2009 at 03:02:35PM -0500, Nathan M. Reeves wrote:
>>>> thanks tom!  the service manual is typical....
>>>> its a good idea to always check the power supply but after that it
>>>> says to basically have ensoniq replace modules....doh!
>>>
>>> On the mirage, 99% of the time problems are solved simply by  
>>> reseating all
>>> the ICs.,
>>>
>>> What sorta problem are you seeing?
>>>
>>> -- 
>>> --------------------------------------------------------------------
>>> - Tom Arnold           -  "...is it a virus, a drug, or a religion?"
>>> - Sysabend Caretaker   -    Juanita Shrugs. "What's the difference?"
>>> ------------------------       -- Neal Stephenson,  Snow Crash
>>>
>>
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