Hi there. Just picked up a Roland D-5 in non-working order. It’s in fantastic cosmetic order, and the internals are surprisingly clean and free of any corrosion. The circuit boards and components are good visually speaking.
I ordered a replacement power supply as I’m sure the initial problem stemmed from that. Once powered up, there I a faint row of blocks in the display. No other indication of power… non of the LEDs are lighting up.
I did test and replace the D6 diode, which apparently is what dies when the wrong polarity power supply is plugged in… But still have the same issue. I also tested the switches on the panel board and they are mostly functioning. I did find a few that seem dead so I’ll be replacing those.
Anyone have any suggestion on where to start? I’d love to breathe life into. I had one back when it was first released.
Thanks in advance.
Are you getting 5v at IC1?
Have you tried to remove panel/keyboard to see if these affect the power up?
IC1 is at 9.8v. Is my new power supply overpowering? The out of that is also 9.8v despite it being the replacement part recommended by Roland. 9v 2a.
Do you get 5v at the output of IC1?
So that looks OK, perhaps a bit high.
Perhaps you can purchase a replacement board?
Ok, so CRAZY story… I looked on Craigslist for no reason at all, then decided to expand the search area… Found a D-5 an hour and a half away. It was reasonable enough and I picked it up on Saturday… Original Box, original power supply, original manual, right down to the styrofoam and cellophane that wrapped the synth… Felt like I was opening it up for the first time again…
CRAZY part 2. Only error was internal battery. Flip the synth to go inside, no sign of entry, no scuff marks, no screwdriver rubs, nothing… Pulled the corroded 2032 out. It’s a Toshiba - Made in Japan… My guess is it’s the original battery from the factory.
Crazy part 3. The synth works… out of curiosity, I metered the original power supply… it is marked 9v 1000ma. But it reads 14.60v. Any thoughts? Suggestions? Don’t want to over power this thing.
Thanks
Is that 14.6v with no load? Or plugged into the synth and switched on?
correct, no load. Just metered the power supply output.
That will be normal with a switched power supply.
Under load it should settle to 9v