No effect led uni-vibe issue

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Jettlane
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Joined: 19 Feb 2023, 09:02

Post by Jettlane »

I would appreciate any help troubleshooting this uni-vibe issue.

This is the uni-vibe with the vintage button. PCB UV-1 Main Board Rev. A July 10, 1997

Power supply is Dunlop ECB004US 18v
1 Amp.

Effects led briefly flashes as power supply is plugged in. Chorus/Vibrato led works as expected when activated but no effect because sw2 never activates.

Voltage regulator is ok. 18v in 15v out.
Effect switch has continuity when activated.
Ribbon cable from switch board to main board has continuity also.

No visual defects present…example cracked solder joints, bulging caps, broken wires.

Thanks to anyone that helps.
Fredi

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