From Florian Anwander Sent Thu, Feb 21st 2019, 16:41
From Florian Anwander Sent Thu, Feb 21st 2019, 16:41
Hi there are two possible influences: 1.) The powerconsumption of th LFOs LED might draw too much current, and have an influence on the supply rail. 2.) The LFO-signal itself is feeding through the potentiometer (corroded ground contact of the potentiometer, broken solder joint at the potentiometer). To check #1: desolder one pin of the LED and check whether the modulations still happens. To check #2: shorten the modulation signal coming from the potentiometer manually to ground. or remove R148 and R164 on the mainboard. Florian Am 21.02.2019 um 17:06 schrieb Nabu M: > Hello all -- > > I just noticed an issue on my SH-2 (supposedly common with these old > Rolands) > > When I hold a key down -- (only) the pitch will waver between -2 cents > and +8 cents (respecting the rate slider and wave type) -- and this > behavior happens even when the Pitch MOD slider is set to 0. > > Has anyone else had this issue? If so, the solution? I am wondering > which part / capacitor to check / replace. > > - I've tried copious amounts of Deoxit F5 in the PMOD slider > - I've tried setting the PMOD to "near 0" -- nada > - I've tried replacing the 470uf power filter capacitors for good > measure -- as I've read on other forum threads this was the solution > for 2 different people. > > I suck at reading circuit diagrams -- I tried tracing the LFO circuit > and I see maybe c16, c17 around that area, and c79 and c39 farther away? > > Would appreciate any kind souls who could chime in and suggest what > the issue could be :) -- http://www.florian-anwander.de