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Topics - inertian

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1
Schematics and Layouts / Roland JC-50
« on: June 25, 2018, 12:46:05 PM »
Roland JC-50 schematic and board layout.

2
Amplifier Discussion / Repairing a Roland JC-50
« on: June 25, 2018, 12:42:31 PM »
Trying to bring an '80's Roland JC-50 back to life.  Blows both internal 4A fuses on power on, external fuse is ok.

Research indicates the output transistors and possibly the drive transistors are shorted.  Have a schematic, but not 100% sure which are the responsible transistors.  Can anyone point me to the right ones, so I can test and replace?

Schematic uploaded to the Schematics section.

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