Joseph_Joestar wrote on 2021-02-07, 08:02:
darry wrote on 2021-02-07, 06:48:
But, the official Roland US recommendation for the SC-155 was the PSB-1U whose european version was replaced by the PSB-230EU, AFAICT .
Hmm, it seems like the PSB-230EU has 9V and 2000 mA. On the other hand, the PSA-230S appears to have 9V and 500 mA.
Looking at the back of my SC-155, it states that 9V and 500 mA should be used. Seeing as how both of these (European) adapters were not really meant for the Sound Canvas, wouldn't it be safer to go with the one whose specs match the SC-155 more closely?
AFAIK, in theory if both have over current protection, that should kick in lat a lower current on the lower specced unit . Again, AFAIK, that should really only come into play if a failure mode causing something like a short were to happen inside your SC-155 .
I know that the PSA-120S and PSB-120 have over current protection (written in/on the box) and I would guess that the PSA-230S and PSB-230EU are the Euro version of those, so I imagine they would too . Roland and Boss web sites do not say anything on the subject, AFAICT .
Incidentally, in the US, the 500mA PSA-120S is the Roland recommended replacement PSU for the MT-32 whose original PSU was rated at 650mA ! Either Roland know something we do not or their recommendations are to be taken with a grain of salt.
At the end of the day, my guess is that if the PSA-230S is indeed current limited at 500mA or so, it is likely safer to limit damages in the case of the SC-155 having a specific over current failure mode . Excluding that scenario, the PSB-230EU should work just as well in day to day use, with the added potential benefit of being re-usable in the future with higher current devices .
That is my 2 cents worth of an opinion .