Do they hold settings through a power cycle? Volume and whatever else you can set. If yes, then there must be a battery

Dominus wrote:

Do they hold settings through a power cycle? Volume and whatever else you can set. If yes, then there must be a battery

Well, I am wondering if these may have memory that can hold it's data even after a power cycle. That would be nice as there would be no worry about any battery issues over time.

Per its service manual, the Yamaha MU2000(EX) has a standard, holder-mounted CR2032.

Cloudschatze wrote:

Per its service manual, the Yamaha MU2000(EX) has a standard, holder-mounted CR2032.

Thanks Cloudschatze! It would be great to find a copy of the service manual as I did not locate a free download of one in my search.

I just replaced the original battery in my SC-50. 😀

SC-155 Battery Leaked ! , im remplace it

What's your experience with power supplies for Roland SC and Yamaha MU modules? Have you experienced any failures? I recently purchased a genuine Yamaha PA-130 PSU for my MU80 as I no longer trust the 20 year old PSU that came with it, but it's a bit of a struggle to find a decent replacement PSU for a SC-55. Looks like Roland has not released a newer version of ACB-240 and I don't really trust all these third party compatible PSUs available on ebay.

blackmasked wrote:

I don't really trust all these third party compatible PSUs available on ebay. [/color]

Don't. Just get something branded that outputs the same voltage then change the connector.
Or get a decent universal PSU (should be >10 dollars/euros).

blackmasked wrote:

I recently purchased a genuine Yamaha PA-130 PSU for my MU80 as I no longer trust the 20 year old PSU that came with it, but it's a bit of a struggle to find a decent replacement PSU for a SC-55.

Personally, I trust a 20-year old transformer-based PSU much more than a new switching-mode PSU made in China...

derSammler wrote:

blackmasked wrote:

I recently purchased a genuine Yamaha PA-130 PSU for my MU80 as I no longer trust the 20 year old PSU that came with it, but it's a bit of a struggle to find a decent replacement PSU for a SC-55.

Personally, I trust a 20-year old transformer-based PSU much more than a new switching-mode PSU made in China...

Speaking of newer PSUs, I have 2 RCA universal PSUs that are rated for up to 2.5A and 12V (either DC or AC, can't recall) for a Yamaha TG-100 and Delco radio from 1996 that was pulled out of the 96 Safari that we had, which does work.

derSammler wrote:

blackmasked wrote:

I recently purchased a genuine Yamaha PA-130 PSU for my MU80 as I no longer trust the 20 year old PSU that came with it, but it's a bit of a struggle to find a decent replacement PSU for a SC-55.

Personally, I trust a 20-year old transformer-based PSU much more than a new switching-mode PSU made in China...

I think all these C64 users who saw their beloved machines go up in flames would disagree, myself included. ;]

blackmasked wrote:

What's your experience with power supplies for Roland SC and Yamaha MU modules? Have you experienced any failures? I recently purchased a genuine Yamaha PA-130 PSU for my MU80 as I no longer trust the 20 year old PSU that came with it, but it's a bit of a struggle to find a decent replacement PSU for a SC-55. Looks like Roland has not released a newer version of ACB-240 and I don't really trust all these third party compatible PSUs available on ebay.

Oh yes, they did release a replacement unit.

The Roland PSB-230 (or PSB-1U if bundled with a Roland device) can replace, among others, any Roland ACB or ACI PSU (the PSUs bundled with e.g. MT-32, CM-32L, SC-55 and many, many other devices). I use these for all my Roland devices (UM-550, CM-32L, SC-55) for several years now. Shouldn't be too hard to find one, it is a current product.

blackmasked wrote:

I think all these C64 users who saw their beloved machines go up in flames would disagree, myself included. ;]

But that's because those PSUs are simply cheap sh*t and have no protection whatsoever. Also, these supply higher voltage than needed which is then regulated down. If the regulator goes short, the much too high voltage goes directly to the device. This is not how you would normally build a PSU.

yeah sadly commodore cut down costs whenever possible, these c64 psus are a nightmare!

I bought a replacement PSU for my MT-32 recently - insanely cheap from China but it appeared identical to another one that I'd had an used for years. It arrived and looked the goods, but it was so light that I was moved to open it up and see if there was anything in there - there was, but I chucked it all the same.

I've since remembered that I have a spare Sega Mega Drive PSU here which people have said are workable - 10V instead of 9V tho.

Yeah 10v will work just fine, the SC-55s do regulate again to 5v internally so it's no big deal. Even higher would work but I'd put a limit to 12v since the internal heatsinks/design is not made for more and the unit could overheat.

Thanks for the tip voodoo5_6k, that's exactly what I was after ;]

keropi wrote:

Yeah 10v will work just fine, the SC-55s do regulate again to 5v internally so it's no big deal. Even higher would work but I'd put a limit to 12v since the internal heatsinks/design is not made for more and the unit could overheat.

Good to know - what about MT-32s? Do they regulate too do you know?

Thanks again.

yep both mt-32 and cm-32L that I have opened do use a 7805 regulator since they are 5v devices 😀

btw, we need a thread "Have you opened your SB-55 to check the caps inside?" 😉