Author Topic: Problem with BOSS SD1 pedal - Battery Vs Mains Power (Read 5706 times)

Brow · « **on:** March 29, 2006, 12:15:47 PM »

Hey guys.

I've been digging out alot of my old gear lately, and came across an old Made In Japan BOSS SD1 Super Overdrive that I bought years ago, but haven't used in a while.

I powered it up with a 9V mains adaptor that I had handy, and noticed that the on/off LED was quite dim when the pedal was switched on. I then tried the pedal with a 9V battery and the LED was alot brighter when the pedal was switched on.

I also tried the SD1 with a brand new Diago Powerstation Pedalboard Power Supply and the LED was still dim.

Does anyone know what the problem may be, and how I could get it repaired?

Craig

jimi hendrix · « **Reply #1 on:** March 29, 2006, 12:35:09 PM »

http://www.freeinfosociety.com/electronics/schemview.php?id=169
if its any good theres a schematic here :D

Brow · « **Reply #2 on:** March 29, 2006, 01:59:46 PM »

Quote from: jimi hendrix

http://www.freeinfosociety.com/electronics/schemview.php?id=169
if its any good theres a schematic here :D

Thanx for the schematic Jimi :)

Apparently, these older Japanese BOSS pedals were made to run on a 9v battery or a 12v mains power supply. Something to do with a diode/resistor that's fitted before the power jack as a safety against using a power supply with the wrong polarity.

If this is the case, am I still safe to use a 9v adaptor with it?

willo · « **Reply #3 on:** March 29, 2006, 02:06:10 PM »

I'm not certain on this, but weren't some of the older boss pedals AC rather than the newer DC?

Brow · « **Reply #4 on:** March 29, 2006, 02:34:28 PM »

Quote from: willo

I'm not certain on this, but weren't some of the older boss pedals AC rather than the newer DC?

I'm not sure to be honest.

The SD1 works fine on a 9v battery and, on the suggestion of someone on another forum, I tried it with a 12v adaptor and the pedal worked fine.

Jp. · « **Reply #5 on:** March 30, 2006, 11:15:08 AM »

Try the www.bossarea.com forum

The guy that runs it and a couple of the regulars are really up on the actual electronics nitty grtty of the pedals

Brow · « **Reply #6 on:** March 30, 2006, 12:22:29 PM »

Quote from: Jp.

Try the www.bossarea.com forum

The guy that runs it and a couple of the regulars are really up on the actual electronics nitty grtty of the pedals

That's where i got the info from about there being a diode/resistor wired before the power jack to safeguard against incorrect polarity :)

I tried the SD1 with a 12v PSU and it worked fine :)

Jp. · « **Reply #7 on:** March 30, 2006, 12:35:54 PM »

Glad I could be of Latent help