[sdiy] Siel OR400 power supply busted

[Paul Anderson]

Make sure you check the resistance. You will still read 120 volts across an open primary. Voltage is potential difference, it doesn't require flowing current to be present. 


Sent from my iPhone

On 2013-08-03, at 5:20 PM, M Maeghan Skala <synth.diy at pulsewidthmod.com> wrote:

> I was able to measure 121 on the wire of the primary, on both of them … so power was going into the transformer, just not coming out of it
> 
> 
> On Aug 3, 2013, at 3:14 PM, ASSI <Stromeko at nexgo.de> wrote:
> 
>> On Saturday 03 August 2013, 14:29:43, M Maeghan Skala wrote:
>>> :( … after switching out some components and much troubleshooting, i
>>> :finally got the proper readings from the board.
>> 
>> Good.
>> 
>>> I plug all the ribbon cables in and plug it into an amp … no power
>>> the transformer's primary wires coming from the connection terminal are
>>> both reading 121, but the secondaries … nothing, O
>>> It's not the fuse, I checked that … also, i don't think the primaries
>>> would be getting power if the fuse was busted.
>> 
>> Some transformers have a thermal fuse integrated into their windings.  
>> Getting no reading at all from the secondaries must mean that the primary 
>> doesn't get power one way or the other.  Assuming that you can disconnect 
>> both the primary and the secondary wiring from the inlet and circuit, please 
>> test with a small DC voltage (diode or connectivity test on your typical 
>> DVM) that all coils are low-resistance.  If you can measure the resistance, 
>> then you should do this as well.
>> 
>>> This is so frustrating, i finally got the right power readings … and this
>>> :(
>> 
>> Well, you've certainly had exceptionally bad luck so far, it must be getting 
>> better any time now.   :-)
>> 
>> 
>> 
>> Regards,
>> Achim.
>> -- 
>> +<[Q+ Matrix-12 WAVE#46+305 Neuron microQkb Andromeda XTk Blofeld]>+
>> 
>> SD adaptations for KORG EX-800 and Poly-800MkII V0.9:
>> http://Synth.Stromeko.net/Downloads.html#KorgSDada
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy