dirtyblues
Member
Hi
I've had a Yamaha C4 preamp in the basement for a few years now. Nice unit. Used to be in my father's system. Then one day it wouldn't turn on.
At the time I thought maybe a fuse had blown but it wasn't that and I forgot about it.
So yesterday I decided it was a shame to let that thing gathering dust. I opened it and tested:
Continuity on the fuses --- ok
The power cable --- ok, tested with a lightbulb
The transformer --- checked the resistances on the primary and secondary, seems ok
Checked the power switch --- ok
I also unsoldered the lead wires on the power board to examine it. I see what I would call leaky capacitors. (see pics)
Note that I know very little about electronics, I have a multimeter and the service manual, I should be able to test a resistance or a voltage between two point of the circuit but that's about it.
Because it stopped working suddenly my hunch is that it's a power supply thing. Is there a thing I can test on the power board?
thanks in advance
I've had a Yamaha C4 preamp in the basement for a few years now. Nice unit. Used to be in my father's system. Then one day it wouldn't turn on.
At the time I thought maybe a fuse had blown but it wasn't that and I forgot about it.
So yesterday I decided it was a shame to let that thing gathering dust. I opened it and tested:
Continuity on the fuses --- ok
The power cable --- ok, tested with a lightbulb
The transformer --- checked the resistances on the primary and secondary, seems ok
Checked the power switch --- ok
I also unsoldered the lead wires on the power board to examine it. I see what I would call leaky capacitors. (see pics)
Note that I know very little about electronics, I have a multimeter and the service manual, I should be able to test a resistance or a voltage between two point of the circuit but that's about it.
Because it stopped working suddenly my hunch is that it's a power supply thing. Is there a thing I can test on the power board?
thanks in advance