Vox AD60VT loses memory when using foot controller

[ChancesR]

Greetings all,

I've searched all of the sites I can think of for a schematic on this - seems too 'new' to be available.

Client states that the program memory is ok until he uses the foot switch (Vox VC-4) - then all of his programmed presets are gone.

Is this the nature of the beast - or is there a memory capacitor (EProm backup) that is failing perhaps?

Regards,
ChancesR

[Gunn_Slinger]

hi
i have a vox ad60vth ( the head ) and its not new ,its discontinued (link to vox....http://www.voxamps.co.uk/archive/index.asp

also search this site for
"link to vox schematics". i didnt find the ad60 but the new ad 50 is rhere ( should be close?...lol ).
my head has noise that you can hear as a note rings out...so far no luck fixing it....boo-hoo///lol
also email enzo...he hates theses amps but knows a lot about em
good luck
Clay
p/s/

The thing has a reinitializtion function that resets all presets
enzo put this up on my post...link
http://music-electronics-forum.com/s...t=gunn_slinger
could be the pedal is doing a reinitializtion in error or its operator error...lol

[ChancesR]

Thanks, Gunn! I appreciate your response....and agree on many of the points you made. Especially the S&W--

I also have a feeling that it's Pilot Error here. I've been reading the manual for this amp - not much help, but he may be resetting it somehow.

I'm going to play around some and verify before I call him.

Thanks again,

Regards,
ChancesR

[Enzo]

And why not contact Vox and ask if this condition is something you are overlooking.

[Robert M. Martinelli]

Uhm...
if the problem only happens when you connect the VC4, I don't think the problem could be due to a bad storage cap or battery, if this was the case, the same thing would happen every time the amp is switched off. ( BTW EPROMs and EEPROMs don' t need a battery backup, only RAMs do ).

( a silly question-do you connect the VC4 to the amp with the amp on? If so the initial current spike would most likely cause problems-the VC4 has to be connected before switching the amp on ).

I would first try to sort out if the VC4 is defective...if it is, chances are ( I' m not playing with your nickname ) it draws too many current, lowering the amp' s internal logic supply, I would try another VC4 ( if you have the chance ) and see if the amp behaves the same, if this is not feasible, I would try to supply the VC4 from a separate source, measure the voltage/current, and see if there is any change in the amp's behavior.

Hope this helps
Best regards
Bob