Roland GR-300 is a classic Guitar Synthesizer that was popular in early 1980s. Its a service/repair manual document which contain electrical wiring diagrams and how complete technical information. Circuit description : GR-300 circuits are mostly built on two circuit boards: VOICE board OP-155 and Gate Board OP-156. Voice board consists of: Fundamental detector, T/V Converter, V/T Converter, envelope generator, chopper gate, power supply.
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