MATRIXSYNTH: Alan's Roland System 100 model 104 sequencer repair (by synthpro)

Monday, September 21, 2020

Alan's Roland System 100 model 104 sequencer repair (by synthpro)


synthpro

A peak inside a Roland System 100 model 104 sequencer.

"This is a personal video I made for Alan going over some diagnostics of his sequencer but figured some of you may enjoy this as well. issues were that it would not sequence and no gate switching. This was new territory for me so was unfamiliar with normal operation clock DC voltages/pk to pk voltage.

to sum up the repair:

The output of the pulse width circuit goes into the Anode (positive side of the diode) D205 and with the negative DC offset out of the pulse width circuit; it would not turn the diode on causing all the problem."

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