[sdiy] Roland CMU-800R transformer query

[Florian Anwander]

Hello Todd

Am 27.02.23 um 04:08 schrieb Todd Sines via Synth-diy:
> When I measure the PSU board from the 220v I get l 20v, GND, 45v, GND, 
> and 15v off CN1 pins 1-5.

According to 
https://www.synthxl.com/wp-content/uploads/2020/01/Roland-CMU-800-Compu-Music-Schematic.pdf 
on CN1 you should read
Pin1<->Pin2 -15V DC
Pin1<->Pin3 +15V DC
Pin4<->Pin5 +5V DC
(it looks like you didn't get the numbering of the pins right).


Measuring the transformer should read something like
Red<->Red ~9V AC
Yellow<->Black ~17V AC
Black<->Yellow ~17V AC
This AC measurement should be done with the Transformer connected to the 
regulator board.

I am selling a torroid transformer with those values, similar to this one
https://www.florian-anwander.de/roland_jx3p/jx3p_transformer.html
(I haven't updated the webpage with the new type yet)

It can be wired for 240V and 120V.

Costs are €24.80 plus shipping ~€22.00. You still have to add customs 
fees and your local import VAT.


Florian
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