No picture.

[Steven.G]

No it has a shaver type plug but the label states 'input 220/240 AC' so assumed it was OK to plug in.

[Dave]

Not meant for a UK shaver socket though. Unless it was a user mod, I suspect that it was meant for Europe, but the primary side is probably OK, you shouldn’t have damaged it by plugging it in.

The low voltage (secondary) wiring makes no sense!

You said three wires all connect to plug pins 1,2 and 5? Are you sure? Was that with it disconnected from the MTX?

[Steven.G]

Yes unplugged! I just rechecked and I get the same results.
I have an adaptor that turns it into a 3 pin UK plug.

[Dave]

If that is really the case, then all of the MTX input voltages are at the same level - it’s not surprising that it doesn’t work!

Can you get the cover off the plug (computer end) and photo graph that?

[Steven.G]

Do you mean the din plug cover?
I'll see what I can do tomorrow.

Steve..

[Dave]

Yes, it is worth having a look inside to see if there is anything amiss there.

There should not be much resistance in the secondary windings of the transformer, but 0.0 ohms is pretty suspicious

[1024MAK]

With that transformer, there are a number of possibilities:

• It’s an earlier version (unlikely given the moulded ‘euro’ plug)’
• It’s a later version than the type we have seen before,
• It’s a type that was only intended for use in Europe,
• Someone has replaced the original transformer with another transformer.

In any event, the photo below shows how I think the primary (input) side is wired:

MTX transformer primary

A4438B38-9885-4D21-9F33-0B1406BDF8D2.jpeg (263.99 KiB) Viewed 7413 times

Steve, does your multimeter have a lower resistance range than the 200 ohm one? E.g. a 20 ohm range?
If yes, try measuring the secondary windings of the transformer using this. Then if you get some results that are greater than 0 ohms, it may be possible to work out what is going on.

In any event, it would be good to see how the inside of the DIN plug is wired.

What is the value of the fuse in that fuse holder?

Mark

[Steven.G]

So I'm going to go back a few steps because like an idiot I had the meter set to 200k!!! my sincerest apologies for any annoyance that may cause.
In the meantime after 3 hours, sore thumbs and index fingers I've managed to get to this with the din plug,

Dsc_0016.jpg (574 KiB) Viewed 7249 times

I now hate moulded plugs.

[Dave]

It's a shame that it was moulded plug, particularly as it's not going to tell us anything once we get accurate measurements

[Steven.G]

BTW the fuse is a T1.6a, and why would you put a fuse inside a sealed case???
Also I was thinking when testing the tabs in the PSU the reading is always going to be false if as it seems 1,2 &4 are connected!
Would it be a good idea to disconnect the wires then test?