I'm a competent systems troubleshooter, but have to work at it at component level. I have a good DVM, scope & signal generator and a dead SX-780
It came in this state; I knew it wouldn't power on, but as a classic for few $$, it seemed an interesting challenge.
It's blowing the 4A fuse, so I've done my homework already and know I've got one or more Darlingtons dead, potentially along with associated components.
However my thinking is that I ought to establish everything that needs work, apart from pots and switches, before investing time and money in the power stage.
Does that make sense for bringing up a unit that I've no prior history of?
It doesn't make sense if it was my long term unit that quit one day - then I'd go straight for the modules.
This receiver doesn't have a pre-out, power-in to enable me to check out the tuner, phono in, switches and controls. A bad tuner or phono stage would have me thinking that this was something to put to the back of the queue.
Is there a tried and tested process for going through one of these that won't power up, that ensures that any seriously bad news is known before starting the refurb process?
It came in this state; I knew it wouldn't power on, but as a classic for few $$, it seemed an interesting challenge.
It's blowing the 4A fuse, so I've done my homework already and know I've got one or more Darlingtons dead, potentially along with associated components.
However my thinking is that I ought to establish everything that needs work, apart from pots and switches, before investing time and money in the power stage.
Does that make sense for bringing up a unit that I've no prior history of?
It doesn't make sense if it was my long term unit that quit one day - then I'd go straight for the modules.
This receiver doesn't have a pre-out, power-in to enable me to check out the tuner, phono in, switches and controls. A bad tuner or phono stage would have me thinking that this was something to put to the back of the queue.
Is there a tried and tested process for going through one of these that won't power up, that ensures that any seriously bad news is known before starting the refurb process?