What are the symptoms? Is it totally dead with no LED by the 'radio' input when it comes on? Can you hear any evidence of turning it on through the speakers, e.g. any slight increase in hiss?
As I understand it one of the Quad 34's weaknesses is the input switching circuitry, i.e. there is a chance it is mainly alive but with a dead control panel, and IIRC this is usually a capacitor issue, though if it is the chip or the board is damaged (by leaky caps) you are in some trouble. What version 34 is it? The earlier ones do apparently self-destruct to some degree as the multi-layer boards are prone to corrosion, the last two versions (board rev. -6 and -7) are far more reliable as the mainboard wasn't painted in the stuff that causes corrosion. Mine is a -6 and has a normal looking translucent glass fibre board so I'm hoping will have a good amount of time left!
Isn't the main selector chip just a set of standard logic gates? Not checked so relying on my own lousy memory. The only cap that comes to mind is the one that pokes the arrangement at power-up to force it to pick one input as default. (Which I tend to shift as suits me anyway. ) Is that the cap you have in mind?
No idea to be honest, I'm just kind of regurgitating things I've read rather than stuff I actually understand! Can you easily alter the input selected at power-up? I'd like to move mine to CD if it is real easy as I don't even have a tuner connected and it concerns me that I am wearing the switches by using them a couple of times most days.
No idea to be honest, I'm just kind of regurgitating things I've read rather than stuff I actually understand! Can you easily alter the input selected at power-up? I'd like to move mine to CD if it is real easy as I don't even have a tuner connected and it concerns me that I am wearing the switches by using them a couple of times most days.