My SC55 needs a diod replaced at D1 right near the power input it looks like the diod 1SR35-100A T-93 is a rectifier diod will any 100v 1amp rectifier diod be good to use?
I'd personally just order the nearest or same diode as they are still available even though discontinued. I'm not familiar with the board but I would be worried any substitutions might introduce noise!
I'm hoping to find something close at jaycar tomorrow I'll try it to see if there is any more shorts on the board I think it suffered a power surge then I'll look for the same type
It likely would be fine substituting equal or better voltage rated rectifier diodes but why take the chance as small as it might be noise wise unless you just can't get the same diode!
I don't know much about diodes or rectifier diodes but isn't a rectifier diode mainly used for converting AC to DC in a bridge, as far as I know there is no AC for the board because it's supplied 9v DC from the power supply adapter, in the pictures below I've taken the diode out and it's before a capacitor and after a line filter so could a normal capacitor be ok
Edit: dang it I meant normal diode
And also how the witch does the black flat cable come out of the socket I've tried carefully and tried with tools to lift the retainer but it won't pull out, it's not soldered to the board the socket has two rows of pins
Diodes are used for more than just AC to DC rectification. Looking at your PCB photos it appears this diode is being used as reverse voltage protection. This diode looks like it was meant to fail shorted in the event a power supply with the wrong polarity is connected.
After looking at the datasheet for D1, it is a 100V PIV 1A diode. A 1N4002 would be a perfect substitute. Don't waste your money tracking down the original part number.
akimmet wrote on 2024-08-13, 13:38:Diodes are used for more than just AC to DC rectification. Looking at your PCB photos it appears this diode is being used as reverse voltage protection. This diode looks like it was meant to fail shorted in the event a power supply with the wrong polarity is connected.
After looking at the datasheet for D1, it is a 100V PIV 1A diode. A 1N4002 would be a perfect substitute. Don't waste your money tracking down the original part number.
OK that will be easier to buy thanks, if it's to protect reverse polarity and the power supply is only 9v 500mA (and at the moment I'm not looking at the datasheet im in bed) is that enough to short it?
In this case the external power supply would fail instead of the diode. I suspect the diode shorted because someone plugged in the wrong power supply. A very common occurrence with music equipment.
