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2018-01-22 by paul.rak@...
I have an EDC SR-99 drum machine that won't play nice. Basically, it won't go into pattern write mode. I have replaced the 4011 and tc5514 chips to no effect. I can't find a schematic or service manual anywhere! Can anyone help?
2018-01-23 by jaydiplock@...
2018-01-29 by Paul Rak
Couple of things to ask... are you running it on batteries or DC psu? Does it run in pattern play mode, ie is the clock running? Sometimes the 4011 needs to be the unbuffered version “UB or UBP” in these old memory rhythm machines...
A smart man makes a mistake, learns from it, and never makes that mistake again. But a wise man finds a smart man and learns from him how to avoid the mistake altogether.
2018-01-29 by Paul Rak
1. Batteries.2. I think I have a UBP installed. I will check. (I have encountered this issue on Boss DR-55s)There's a mass of wires and a trimmer pot on the underside of the PCB. Looks like it might be a mod of some kind.I'd like to see other photos of an EDC sr-99 board to compare. A schematic would help!Thanks.--On 23 January 2018 at 11:28, jaydiplock@... [vintagesynthrepair] <vintagesynthrepair@yahoogroups.com> wrote:Couple of things to ask... are you running it on batteries or DC psu? Does it run in pattern play mode, ie is the clock running? Sometimes the 4011 needs to be the unbuffered version “UB or UBP” in these old memory rhythm machines...
A smart man makes a mistake, learns from it, and never makes that mistake again. But a wise man finds a smart man and learns from him how to avoid the mistake altogether.
2018-02-01 by jaydiplock@...