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Looking for info on converting Roland MKS 70 rack synth from 220 to 110 V . The power trannie has 240, 220 , and 117 terminals marked. It looks as simple as moving the black wire from 240 to 117 ( solder job) . Can any one confirm that is all there is to it, or would there be other board considerations ? Thanks in advance.
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The attached service notes show three different transformers.
As yours may be different, you will have to suss it out.
I would use a variac to verify that the conversion works.
I see no indication of any other changes to borads.
http://dl.lojinx.com/analoghell/Rola...rviceNotes.pdf -
On page 33 of the manual Jazz posted, you just change the one wire on the primary of the transformer.
If you are unsure, then there are three fuses on the secondaries of the transformer. Remove these & change the wire on the the primary to the terminal marked 117V. Removing the fuses "disconnects" the secondaries from the rest of the circuit, so the electronics are not powered for this test. If you cant remove the fuses, is it possible to unplug the secondaries from the circuit board, or unplug the power supply board from the rest of the electronics ?
The secondary wires red - black - red power a +/-15V supply, so i would expect something between 15VAC & 20VAC from each red to black (or 30VAC to 40VAC red to red).
The orange wires power a 7V and 5V supply so i would expect something like 6VAC here.
If you get these voltages, put the fuses back where you got them from & you should be good to go.
I would mark somehow on the back of the unit "set internally for 115VAC supply" or something like that.Comment
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