That's gone bang by the look of it, with arc damage on the edge maybe? Perhaps mechanical impact shorted it out?
I also guess that these light blue and green resistors are replacements for burned original components that have left sooty residues into their vicinity.
Best regards!
Best regards!
It would take a lot of voltage to do that to a ceramic cap - I would expect a lot of collateral damage there too. Caps like that don’t go bang by themselves, and when you put enough voltage on a circuit to do that the transistors don’t survive.
What is this circuit?
Burned ceramic capacitors is a common fault in horizontal deflection circuit in cathode ray televisions.
I repaired a valve amp some years ago that had - amongst other things - a ceramic decoupling cap go short(ish) circuit. The cap itself looked fine, but it measured about 100R out of circuit.
So yeah - a rare failure. But not unheard of.
(Marshall DSL401; C65. If anyone cares.)
Cheers, and regards,
Ant.
So yeah - a rare failure. But not unheard of.
(Marshall DSL401; C65. If anyone cares.)
Cheers, and regards,
Ant.
In both cases, the voltages involved are kind of on the high side. Possibly subject to abnormally high voltages too if something goes wrong.
Ceramic caps like these do fail, get it out of circuit and confirm it. (usually brand related (cheap and nasty) or physical and/or heat damage.)
Once confirmed also replace the same one(s) in that particular area.
Once confirmed also replace the same one(s) in that particular area.
In practice they can and do, and with nothing more than within the original voltage rating .
With enough current behind them they’ll completely vaporise.
A relatively common one for me in recent years with certain finished product brands (HK for one example across low voltage bridge rectifier diodes, all that will be left are the legs in some cases.
Crap brand of cap is the cause.