Have you opened your SC-55 to check the battery inside?

Discussion about old sound cards, MIDI devices and sound related accessories.

Re: Have you opened your SC-55 to check the battery inside?

Postby DevanWolf » 2019-7-24 @ 17:16

There is another MIDI sound device with a battery backup that is the Casio LD-80 here which runs the internal RAM memory for the custom drum kit setup and drum song recording. Have a look at it:
Image
I did replace the battery with another good one I have and it should work better. The one that is in has a bump in the top and may not work correctly.
Last edited by DevanWolf on 2019-9-17 @ 15:34, edited 1 time in total.
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Re: Have you opened your SC-55 to check the battery inside?

Postby Slot1 » 2019-8-30 @ 13:55

I have removed the battery today, also upgraded the ROM thanks to keropi! Follow up is posted in this thread: viewtopic.php?f=62&t=59497&p=781011#p781011

roland-rom2.jpg
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Re: Have you opened your SC-55 to check the battery inside?

Postby MaverickUK » 2019-9-20 @ 10:28

I've glad that I stumbled across this thread, as it's prompted me to check my SC-55.

I bought it a few years ago from Japan and it was listed as having "no battery"

However look what I found when I just opened it up...

SC-55 battery.jpg


Thankfully it wasn't leaking, but I've removed it anyway.
http://www.strifestreams.com // Regular nuggets of retro gaming
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Re: Have you opened your SC-55 to check the battery inside?

Postby bifo78 » 2019-9-30 @ 22:50

I've decided to try to finally get around to fixing my SC-55, but my knowledge of electronics is limited. The issue is a blown D1 diode, listed on the parts sheet in the service manual as 1sr35-100a t-93, which is listed on it's family datasheet as a DO-41 package here:
https://www.datasheets360.com/pdf/-2147230067271245127

These seem to be unobtanium now, but in the same family with the same rating and packaging is the 1N4002A, which are very common. The 1SR35 is glass packaged while the 1N4002A appears to be round molded plastic, should they work the same way or is there a major difference that will cause problems?
Korg AG-10 | Kawai XS-1 | Roland CM-32P | Yamaha FB-01 | Roland D-110
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Re: Have you opened your SC-55 to check the battery inside?

Postby DNSDies » 2019-10-03 @ 22:10

Here you go:
https://www.mouser.com/ProductDetail/Di ... %252B7A%3D

That should be a suitable replacement.
Mouser has a feature that cross-references and finds modern replacement parts for some components.
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Re: Have you opened your SC-55 to check the battery inside?

Postby imi » 2019-10-08 @ 14:37

so shortly after getting my beige SC-55ST which doesn't have a battery I actually found a SC-55 mkI for a reasonable price as well and I'm glad I knew of this thread, thanks.

sc55_bat01.jpg

is that white gunk on the edge?

sc55_bat02.jpg

it sure is.

I blew out the unit with some air and there was really no dust in the rest of the unit but from the battery area I saw a bit of white-ish dust being blown away, so it did already leak onto the board ever so slightly.

I'm glad I caught it in time, the board still looks perfectly fine.

the power button needs some love though :)
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Re: Have you opened your SC-55 to check the battery inside?

Postby bifo78 » 2019-10-14 @ 10:34

DNSDies wrote:Here you go:
https://www.mouser.com/ProductDetail/Di ... %252B7A%3D

That should be a suitable replacement.
Mouser has a feature that cross-references and finds modern replacement parts for some components.


Excellent, that's the type I was looking at and ordered a batch on ebay. I've had that SC-55 collecting dust since I bought it (ebay, naturally) non working and discovered that the diode had blown. Hopefully it saved the rest of the board, but $40 years ago and another dollar on some diodes is worth taking a punt on.

Now to wait until they get here, plenty of projects to do between now and then.
Korg AG-10 | Kawai XS-1 | Roland CM-32P | Yamaha FB-01 | Roland D-110
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