I have the 110v specific power supply and am trying to determine if it can easily be converted for 220v operation. Looking at the multi-voltage and 110v schematics they are very similar...it looks to me as if the transformer primary is center tapped and in the multi-voltage type the voltage set switch simply switches the taps.
In the 110v version, one tap is used to set the voltage and the other seems to deadheaded to a dummy terminal on the supply board. What I am trying to confirm is whether simply swapping the dead-headed tap with the live tap will accomplish the voltage change. Could it be that simple?
Has anyone actually done it?
What is confusing me is that according to the schematics the transformer wiring appears very slightly different - just don't know how different.
Thanks in advance for your help, Neil.
In the 110v version, one tap is used to set the voltage and the other seems to deadheaded to a dummy terminal on the supply board. What I am trying to confirm is whether simply swapping the dead-headed tap with the live tap will accomplish the voltage change. Could it be that simple?
Has anyone actually done it?
What is confusing me is that according to the schematics the transformer wiring appears very slightly different - just don't know how different.
Thanks in advance for your help, Neil.
Hi! This thead is about 10 years old, but is exactly my questions also. Just got a 110V MKII from Japan, og and are currently troubleshooting the powersupply. 140V is working, though about 155V. 5V and 32V are not working.
But I also noticed that there is an extra primary tap connected to a dummy terminal on the top board. The wire is orange. I`ll check if this gives about 2x the resistance with either the red or black wire that is connected to the 110V mains.
But I also noticed that there is an extra primary tap connected to a dummy terminal on the top board. The wire is orange. I`ll check if this gives about 2x the resistance with either the red or black wire that is connected to the 110V mains.
I'd pull the SP-10 Mk II service manual off of Vinyl Engine. The PCB picture shows the wiring for, presumably, the USA 120V connection, which uses the orange wire. Unfortunately the schematic ignores the exta wire on the primary of the transformer and doesn't list the colors of the wires. But with an ohm meter you should be able to figure out what's going on. Maybe you'll get lucky and you can rewire the connections to be correct for USA 120V vs the Japanese nominal 100V. I wouldn't expect that Technics used two different transformers, one for Japan and one for USA, but stranger things have happened. Even if the transformer has 100/120V options, it doesn't have enough options for the rest of the world (230V)
I have the schematics for the multivoltage version, but my version has only taps for 100 and 120V it seems. The orange wire is one of the ends of the primary wiring for 120V. So there was at least two different transformer versions.
- Status
- Not open for further replies.