Repair Electro Industries 3002A PSU after reverse polarity
 

I carelessly attached a battery with reverse polarity to my Electro
Industries 3002A PSU. I didn't realise until I saw a wisp of smoke
after maybe 10 seconds. Needless to say it now does not work
correctly. Looking inside the circuit board is populated with easily
accessible discrete components that I could probably replace. So
question is what is likely to need renewing? I assume active devices
such as 2N3055, TIP31C, L7805CV. What about passives eg capacitors,
resistors? Appreciate any advice before I condemn to the bin.

Repair Electro Industries 3002A PSU after reverse polarity
 

wrote in message
...
I carelessly attached a battery with reverse polarity to my Electro
Industries 3002A PSU. I didn't realise until I saw a wisp of smoke
after maybe 10 seconds. Needless to say it now does not work
correctly. Looking inside the circuit board is populated with easily
accessible discrete components that I could probably replace. So
question is what is likely to need renewing? I assume active devices
such as 2N3055, TIP31C, L7805CV. What about passives eg capacitors,
resistors? Appreciate any advice before I condemn to the bin.

Check to see if you just smoked a diode on the input.

Mike

Repair Electro Industries 3002A PSU after reverse polarity
 

wrote in message
...
I carelessly attached a battery with reverse polarity to my Electro
Industries 3002A PSU. I didn't realise until I saw a wisp of smoke
after maybe 10 seconds. Needless to say it now does not work
correctly. Looking inside the circuit board is populated with easily
accessible discrete components that I could probably replace. So
question is what is likely to need renewing? I assume active devices
such as 2N3055, TIP31C, L7805CV. What about passives eg capacitors,
resistors? Appreciate any advice before I condemn to the bin.



Get your nose right on the circuit board - you should be able to sniff out
the burnt component.



Gareth.

Repair Electro Industries 3002A PSU after reverse polarity
 

On 25 Feb, 12:48, "Gareth Magennis"
wrote:
wrote in message

...

I carelessly attached a battery with reverse polarity to my Electro
Industries 3002A PSU. I didn't realise until I saw a wisp of smoke
after maybe 10 seconds. Needless to say it now does not work
correctly. Looking inside the circuit board is populated with easily
accessible discrete components that I could probably replace. So
question is what is likely to need renewing? I assume active devices
such as 2N3055, TIP31C, L7805CV. What about passives eg capacitors,
resistors? Appreciate any advice before I condemn to the bin.

Get your nose right on the circuit board - you should be able to sniff out
the burnt component.

Gareth.

thanks. Will apply olfactory analysis. Hope repair is a simple as that.