[sdiy] Elektron

[Jean Bender]

!!!!! THANKS !!!!

you gave me the informations i needed ! Well, now, just have to go
back to my workshop and see what happens.. Thanks a lot, it will be
really easier for me to try debbugging it !
I understand what you mean about the analog ground. I thought about
that when i took my measures and didn't understand anything.. So the
pin out connector will help me !

But for information, the unit is absolutely not powering up. No leds,
nothing... And it's always been powered by the original elektron psu
which is working !

Cheers,
Jean

2013/12/31 Mattias Rickardsson <mr at analogue.org>:
> Sorry to hear about the sleeping Machinedrum...
>
> How dead is it? Does it light up anything?
> If it lights up but nothing starts, then it might be time to retire
> the big capacitors in the PSU after a long and strenous life.
>
> 6VAC is only to be expected at full current draw, so higher voltage is normal.
>
> The digital section uses 4 schottky diodes to full-wave rectify the
> AC. Then there is probably a 5 V regulator (LM2904T-5) and a 3.3V
> regulator (LM317).
>
> The analog section transforms the 6VAC up to 12VAC and half-wave
> rectifies it and regulates to +/- 8V (with a 7808/7908). On the I/O
> PCB there is an analog 5V regulation as well (LM317).
>
> If you have disconnected the PSU PCB (which you should probably do
> while measuring the PSU) then the regulated digital & analog voltages
> are floating with respect to each other, i.e., you need to measure an
> analog voltage in reference to an analog ground and vice versa.
> Measuring between an analog voltage and digital ground could end up
> anywhere.
>
> There is a connector for 3.3V, another for 5V, and a 10-pin connector
> with the following voltages:
>
> DGND
> DGND
> AGND
> -8VDC
> AGND
> 5VDC (MIDI)
> AGND
> +8VDC
> AGND
> AGND
>
> Another thing to watch out for is if some component pins or some
> heatsink has come in contact with the casing - this is not good and
> can give similar problems.
>
> Unless you find any clues so far, try measuring the voltage coming IN
> to the LM317 (should be 6-8 VDC over for example C8, C21) and OUT from
> the transformer (should be around 12 VDC over C15).
>
> Good luck, and happy new drummachine year! :-)
>
> /mr
>
>
> On 30 December 2013 19:43, Jean Bender <lofideadbeat at gmail.com> wrote:
>> Well, i've taken my measure with my multimeter. I switched from AC to
>> DC as i know the lm** pinouts. I did that fastly this afternoon as i'm
>> working this night and tomorrow. I'll go back to my workshop
>> tomorrow..
>> I should have taken some pictures or other regulators references..
>> I'll send that tomorrow night or on Wednesday.
>>
>> The strange thing is even if powered, and with my AC current ok at the
>> fuse output ( so just before the whole regulation unit), absolutely
>> none of the regulator was heating. And they have pretty big power
>> dissipation stuff !
>>
>> It's the first time i don't really understand a power supply, and as i
>> don't have any schematics...
>>
>> Thanks for the help.
>>
>> 2013/12/30 Byron G. Jacquot <thescum at surfree.com>:
>>>>Hi everybody !
>>>>I've just bought an Elektron Machinedrum sps 1 ( first generation).
>>>>The friend who sold it to me tested it before shipping, and it was
>>>>working.
>>>>Once i tried to plug it, it never started. I fisrt thought it wa sue
>>>>to the external power supply ( it should give a 6v AC out), but no..
>>>>except if 7,23v AC out is too bad..
>>>>So i opened my sps1. The fuse is ok, the power connector also.. i can
>>>>get my ac voltage at the fuse output.
>>>>After that.. nothing. There are many regulators, but for most of them
>>>>i can't figure how they work. I've just check a lm7808 and a lm317
>>>>that don't deliver good voltages..
>>>>And visually, no component seems to have burn..
>>>
>>> There's likely nothing wrong with the AC supply.
>>>
>>> External transformers are usually rated to deliver the stated Voltage at the stated current.  If you draw less current, the Voltage will be somewhat higher...7.23 seems about right for a 6VAC supply.
>>>
>>> It's also pretty unusual that all of the voltage regulators would fail at once.  I'd suspect something that's common to all of them.  How are you measuring them?
>>>
>>> If it was just shipped, perhaps a connector slipped out of place?
>>>
>>> -Byron Jacquot
>>>
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>>
>>
>>
>> --
>> Jean Bender
>>
>> Hak Lofi Record
>>
>> ELECTRON CANON
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-- 
Jean Bender

Hak Lofi Record

ELECTRON CANON