Need help to revive Rotovibe!!!

bjornf2 · 06-14-2009, 10:54 PM

Hello
I grabbed the wrong power supply and put 9v AC into my Rotovibe. Ordinarily I don't believe this should cause a problem with most devices, but something happened to my Rotovibe. No lights, no effects, no sound, no smoke, no visible problems.

Does anyone have schematic or link to one for the ch63052 rev d ??
Any typical component to replace for this type of problem? There is probably just no power getting in. I am handy with the solder iron.

Thanks
bjornf2

Bloodbath · 06-15-2009, 07:16 AM

Here is a thread with the only Rotovibe schematic that I know to exist.

Dunlop Rotovibe schematic

There is a diode and what looks like to be a chip at the power supply input. Check there first.

bjornf2 · 06-16-2009, 12:29 AM

I managed to temp fix my Rotovibe!
First, the only available schematic is not the same as my circuit at all, unfortunately.
The power, battery or external plug, feed into a MPSA18 which is an NPN transistor. The 9v feeds the collector with a 2.1K ohm resistor between collector and base. Very little power was getting to the emiter, so I simply pulled the transistor and shorted accross. Works.
Now I just have to buy a new transistor.
Bjornf2

oreolong · 11-04-2009, 06:31 AM

I bought a rotovibe some 6 or 7 years ago always bought cheap universal adjustablle dc chargers from walmart the kind with 3 tips on one plug and i learned my lesson not long after when i reversed the polarity i kept the pedal since then i dunlop emailed saying they would charge 65 bucks to fix it but i followed the advice here and desoldered the transistor and shorted the base collector and emitter points and it works!!!!!!!! after all these years im quite proud of myself a long lost pedal is back in business !!!!!!

Phostenix · 11-04-2009, 02:23 PM

Now, make us proud & replace that bad transistor so that the pedal is protected against the next oops and all you have to fix is that transistor again.

oreolong · 11-04-2009, 06:44 PM

I found a replacement matching transistor in a bunch of components i had and replaced it thanks again guys i am currently learning about electronics radio and audio as a hobby and would like some reccomendations on where to get schematics for simple guitar pedals

Phostenix · 11-04-2009, 07:08 PM

I would suggest going through R.G.'s website:
New Page 1

Phostenix · 11-04-2009, 07:13 PM

Check out the DIYstompboxes.com froum, too:
DIYstompboxes.com - Index

06-14-2009, 10:54 PM	#1
bjornf2 Junior Member Join Date: Jun 2009 Posts: 2	Need help to revive Rotovibe!!! Hello I grabbed the wrong power supply and put 9v AC into my Rotovibe. Ordinarily I don't believe this should cause a problem with most devices, but something happened to my Rotovibe. No lights, no effects, no sound, no smoke, no visible problems. Does anyone have schematic or link to one for the ch63052 rev d ?? Any typical component to replace for this type of problem? There is probably just no power getting in. I am handy with the solder iron. Thanks bjornf2

06-16-2009, 12:29 AM	#3
bjornf2 Junior Member Join Date: Jun 2009 Posts: 2	Temp Fixed-It I managed to temp fix my Rotovibe! First, the only available schematic is not the same as my circuit at all, unfortunately. The power, battery or external plug, feed into a MPSA18 which is an NPN transistor. The 9v feeds the collector with a 2.1K ohm resistor between collector and base. Very little power was getting to the emiter, so I simply pulled the transistor and shorted accross. Works. Now I just have to buy a new transistor. Bjornf2

11-04-2009, 06:31 AM	#4
oreolong Junior Member Join Date: Nov 2009 Posts: 2	Thanks it worked for me I bought a rotovibe some 6 or 7 years ago always bought cheap universal adjustablle dc chargers from walmart the kind with 3 tips on one plug and i learned my lesson not long after when i reversed the polarity i kept the pedal since then i dunlop emailed saying they would charge 65 bucks to fix it but i followed the advice here and desoldered the transistor and shorted the base collector and emitter points and it works!!!!!!!! after all these years im quite proud of myself a long lost pedal is back in business !!!!!!

11-04-2009, 02:23 PM	#5
Phostenix Senior Member Join Date: Jul 2009 Location: Phoenix, AZ Posts: 383	Now, make us proud & replace that bad transistor so that the pedal is protected against the next oops and all you have to fix is that transistor again. __________________ ST in Phoenix

11-04-2009, 06:44 PM	#6
oreolong Junior Member Join Date: Nov 2009 Posts: 2	oh yeh I found a replacement matching transistor in a bunch of components i had and replaced it thanks again guys i am currently learning about electronics radio and audio as a hobby and would like some reccomendations on where to get schematics for simple guitar pedals

06-15-2009, 07:16 AM	#2
Bloodbath Member Join Date: Dec 2008 Posts: 63	Here is a thread with the only Rotovibe schematic that I know to exist. Dunlop Rotovibe schematic There is a diode and what looks like to be a chip at the power supply input. Check there first.

11-04-2009, 07:08 PM	#7
Phostenix Senior Member Join Date: Jul 2009 Location: Phoenix, AZ Posts: 383	I would suggest going through R.G.'s website: New Page 1 __________________ ST in Phoenix

11-04-2009, 07:13 PM	#8
Phostenix Senior Member Join Date: Jul 2009 Location: Phoenix, AZ Posts: 383	Check out the DIYstompboxes.com froum, too: DIYstompboxes.com - Index __________________ ST in Phoenix

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