Electronics > Repair

Repair help; trying to identify hot and neutral

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jeremy:
Hi all,

Got a repair job here. A business throwing out a perfectly good amplifier, and they snipped the AC cable :( . The power supply has a 2 pin plug/connector with a purple and brown wire going into it. The purple is marked "AC-H" on the silkscreen and the brown marked "AC-G". While I'm pretty sure this means purple == hot and brown == neutral, it would be nice if someone could confirm this for me ?

I've tried googling it to no avail.

kolbep:
Open it up.
The wire that goes through the fuse and powerswitch is usually the live.
The neutral normally goes straight into the transformer, unless they use a double pole main switch.

P

IanB:
Where did he amplifier come from--anywhere in Europe perhaps? In Europe brown is live and blue is neutral. Usually that would be light brown and light blue, hard to mistake light blue for purple though.

Why not trace the connections on the inside? Is there a chassis fuse for instance?

It shouldn't matter a lot if you happen to reverse the connections as both sides should be insulated.

walshms:

--- Quote from: jeremy on September 29, 2013, 05:13:52 am ---The purple is marked "AC-H" on the silkscreen and the brown marked "AC-G". While I'm pretty sure this means purple == hot and brown == neutral, it would be nice if someone could confirm this for me ?

--- End quote ---

Probably a safe bet.  Can't speak for your systems there, but here in the US, neutral is usually tied to ground for our 120V systems. 

jeremy:
Hi guys,

Sorry, it's an AU amp. I'm trying not to pull the whole thing apart because it is put together rather painfully. But I have probed the pins and the fuse, apparently AC-G is connected to the fuse? Now I'm confused.

Just found the pcb layout of the PSU board, any repair dudes handy?

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