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Boss CS-1 troubleshooting
Posted: Thu Jul 29, 2021 5:34 pm
by sebastien32
Hi,
I have a CS-1 since 6 months but never tried it (oups) so today was the day to try it out to see if it's working and it's not... At least not completely, the volume is really low even when bypassed with a lot of noise. I can here the effect of the knobs and toggle switch so the pedal is "working". it's so low in volume that it's not usable.
Where should I look for? I already opened it to see if something obvious was causing it without luck. I tried both with a battery and with an ACA adapter with no difference.
Re: Boss CS-1 troubleshooting
Posted: Thu Jul 29, 2021 7:01 pm
by Old_Iron
sebastien32 wrote: ↑Thu Jul 29, 2021 5:34 pm
Hi,
I have a CS-1 since 6 months but never tried it (oups) so today was the day to try it out to see if it's working and it's not... At least not completely, the volume is really low even when bypassed with a lot of noise. I can here the effect of the knobs and toggle switch so the pedal is "working". it's so low in volume that it's not usable.
Where should I look for? I already opened it to see if something obvious was causing it without luck. I tried both with a battery and with an ACA adapter with no difference.
A possible solution for what you are saying could be to clean the IN and OUT jack contacts, some oxidation could cause that.
Another possibility is a leaking electrolytic capacitor, but a bit rare to happen.
Laurie is our tech man here, he will give you a better advice.
Re: Boss CS-1 troubleshooting
Posted: Thu Jul 29, 2021 10:59 pm
by laurie
Let's start with some hi-res pics. PM me for my email address - can't upload large file sizes here.
Pics:
1) Front of board, several angles.
2) Rear of board.
3) internal wiring, several angles.
Re: Boss CS-1 troubleshooting
Posted: Fri Jul 30, 2021 6:16 pm
by sebastien32
laurie wrote: ↑Thu Jul 29, 2021 10:59 pm
Let's start with some hi-res pics. PM me for my email address - can't upload large file sizes here.
Pics:
1) Front of board, several angles.
2) Rear of board.
3) internal wiring, several angles.
PM sent
Thank you very much!!!
Re: Boss CS-1 troubleshooting
Posted: Fri Jul 30, 2021 8:13 pm
by Old_Iron
Sorry, I misunderstood it.
Re: Boss CS-1 troubleshooting
Posted: Fri Jul 30, 2021 8:31 pm
by laurie
Old_Iron wrote: ↑Thu Jul 29, 2021 7:01 pm
Another possibility is a leaking electrolytic capacitor, but a bit rare to happen.
Looking at the pics sent to my email, this is almost certainly the problem.
Re: Boss CS-1 troubleshooting
Posted: Fri Jul 30, 2021 8:37 pm
by Pepe
The older the pedal, the higher the possibility that the electrolytic capacitors might be faulty. That's also why most '70s synthesizers need to be recapped nowadays. My oldest pedals (from the mid- and late-'70s) as well as a few ones from the early '80s had faulty electrolytic capacitors that caused problems. Those beasts simply don't work forever.
Re: Boss CS-1 troubleshooting
Posted: Sat Jul 31, 2021 9:26 pm
by sebastien32
As suggested by Laurie (thanks for the help again), I will change all the electrolytic capacitors and see if it works. I just need to figure out what to order exactly. I found a schematic but it doesn't match exactly my version of the CS-1. The board on mine is marked as ET-30D and the schematic that I found is Et-30B
Re: Boss CS-1 troubleshooting
Posted: Thu Aug 05, 2021 2:10 am
by sebastien32
Update: Capacitors removed from the pedal and new ones orders. Now I'm waiting...
Re: Boss CS-1 troubleshooting
Posted: Thu Aug 05, 2021 6:49 am
by Pepe
Normally I replace old capacitors piece by piece, so that I cannot mix up the different values. Good luck!