#synthesizers

Roland TR727 Analog Rhythm Composer

• had issues with few contacts, resolved with contact cleaning

Roland TR707

• had issues with 2 buttons, initially suspected that the buttons themselves weren't contacting well but after checking with multimeter and some investigation with schematics, found that there was a small scratch in the secondary circuit board (for the buttons)
• resolved by soldering a thin wire over the scratch
• original issue of the display being too dark cannot be resolved, tried adjusting certain potentiometers in the board but nothing changed

notes

• learnt how to check valid connections with a multimeter
• learnt how to diagnose issues by checking through schematics
• very cool session
• oscillator basics!