S-550 Blowing Fuse

HxC Floppy Emulator Roland Samplers/Keyboards support
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ghunter
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Joined: Sat Sep 05, 2015 4:32 am

S-550 Blowing Fuse

Post by ghunter » Tue Sep 22, 2015 4:27 am

I have a Roland S-550 that blows fuse F3 (4A, 125V) whenever the unit is turned on with either an HxC or Gotek emulator is connected. The Molex connector on the floppy power cable prevents me from plugging it in the wrong way. I've tried disconnecting the SCSI board to reduce the power load, but this doesn't help. The unit powers up perfectly when the original floppy drive is connected.

Any ideas as to what could be going wrong here?

Jeff
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Re: S-550 Blowing Fuse

Post by Jeff » Tue Sep 22, 2015 8:38 am

ghunter wrote: Any ideas as to what could be going wrong here?
You are doing a very bad thing, but hard to say what without any picture...

ghunter
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Re: S-550 Blowing Fuse

Post by ghunter » Tue Sep 22, 2015 5:15 pm

Picture attached. I've also submitted a ticket to Roland Support asking for the schematic.

Image

Jeff
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Re: S-550 Blowing Fuse

Post by Jeff » Tue Sep 29, 2015 7:49 am

On this machine, the +5V power supply is present into the floppy ribbon.
You blow fuse because you have connected the floppy ribbon to the wrong way. The colored wire should be near the power connector.

ghunter
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Re: S-550 Blowing Fuse

Post by ghunter » Tue Sep 29, 2015 11:21 pm

That worked perfectly, I'll post notes to the Roland Sampler groups.

Thank you again!

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