Fender Twin Reverb Reissue vibrato

[sorin65]

just working for some mods ( replacing caps, pots, resistors) on a reissue twin reverb. but I have a question about this one, regarding the vibrato schematic: seems that in this model (2011) they replaced the optocupler ( neon light and photoresistor) with a big pcb with smd parts. does any fellows seen that? on later reissues Fender uses the optocupler part. in this one not. I have some pictures, but I don t see how to post.
looking forward for your thoughts about this issue. thanks!

[bob p]

I seem to remember Fender being in a period of difficulty with ROHS compliance that mandated them to stop using the optocoupler bug until they became ROHS compliant. I understand that they used a different circuit then, but I don't remember details. I've successfully avoided having to service one. That said, you should do a search. I remember the topic being discussed here before. There should be a thread with photos in the archives.

[Enzo]

Or CALL Fender and ask about it.

[bob p]

this ugly thing?



Pedro Vecino gets credit for being the first person here to find one in a Deluxe Reverb.

http://music-electronics-forum.com/t5756/

[g1]

What country are you in?
I know some of the members in Europe have posted about this circuit before.

edit: thanks Bob, I see you found it!

[Leo_Gnardo]

this ugly thing?

Holy moley, that's an awful big pile of crapola to sub for a neon lamp & photocell Fender, what were they thinkin?

[bob p]

that thread was pretty easy to find. i remember the debate about how RoHS compliance resulted in a replacement board that was less "green" than a tremolo bug that the EC was eliminating. the thread evolved into a "green" hijack, so I searched for "Prius Hummer" and it came right up.

[sorin65]

thanks for the replies. in my twin reverb I removed also a second pcb, the power supply for SMD opto circuit. the power supply pcb used the brown wires from the PT, and two wires - orange and yellow goes to CP9/CP10 main board. so you have to reroute the brown wires directly to CP9/CP10. this AC voltage are used for biass the 6L6s.

[bob p]

that other thread has pictures of both boards.