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Original Roland Vintage Service Manual Booklet for HK-20 Keyboard Amp, from 1983.

This is an original Roland service manual for the vintage HK20 keyboard amplifier.

It is an original service manual in very good condition, just a couple of the hole punches torn, and it's complete. With specs, layout, parts list, circuit boards, and circuit diagrams / schematics. This is a brief booklet, 4 pages of info, but it will help you work on / repair your HK-20.

It's from 1983 and was printed in Japan!

• This is a manual or document, this is NOT a piece of equipment or instrument. If you have any questions, I'm always happy to answer them. !

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