It was connected! It’s not now but the amp is still blowing fuses. It was connecting to Tr1 so I will need to test that and all the other transistors.
Thanks Mooly. It is, I didn’t want the diode the other side getting too hot so was only on it for a couple of seconds.
OK 🙂 it just had that classic look of pushed through and the solder not having 'taken' to the component lead.
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I have to go to work soon so I will try to have a look at the amp later. Hopefully I will have a few things to check.
That looks like a solder splash (shard) and doesn't actually look to be bridging but if in doubt measure between the print first to see if there is a short.
Those things usually flick off with a finger 🙂
Those things usually flick off with a finger 🙂
I only have 3A or 5A fuses at the moment. I have been replacing the blown ones with 3A. Are 3A fuses going to just blow or are these ok until I get some 4A? Could Tr1 and other transistors been damaged by the two tracks touching?
If you have a DMM with a diode measurement, check the transistors and diodes by comparing with the ok board.
What touched what exactly. Can you say by looking at the circuit diagram what two points were joined accidently?
If it still isn't working then always use a DBT (dim bulb tester) for fault finding rather than blowing fuses. The bulb tester prevents excessive current in fault conditions.
Hmm... that would most likely pop the 100 ohm resistor as shown here. It would place the resistor across the +50 volt rail. It would be an instant frazzle.
The transistor would be fine if that is what happened. If it was the base or collector shorted to ground then the transistor could well be zapped.
The transistor would be fine if that is what happened. If it was the base or collector shorted to ground then the transistor could well be zapped.
Although on second thoughts it would/could still pull current through the 560 ohm if the 100 ohm went open circuit. So yes, it may be damaged.
That might be zapped as well. Check those resistors.