Give us a photo of the meter and we'll guide you.

 

Thanks

Will be online uk time approx 3-4pm tomorrow with meter photo - amazing support guys!

thx

 

The BLACK is suggestive of being blown.

Agreed, but a meter will tell the truth, then we can follow the fault path.

 

Hi All, just purchased a multi meter and attached. if anyone can talk me through what I shoaled yes testing/what connections, what settings etc.
I will then post the readings.

 

attached

 

on the unit as seen in photo there is a 800mA fuse / 250v and on the other side there is a 2.5A / 125v fuse.
I purchased a new fuse 800mA / 250v so is that the one I need to put?

 

With the meter set as shown in the picture connect the leads as below and report the readings:
Across the blue and white transformer wires.
Across the two orange transformer wires.
Across each of the fuses.

 

results: see attached photos

Across the blue and white transformer wires = 1
Across the two orange transformer wires = 0
Across each of the fuses both = 1

 

results: see attached photos

Across the blue and white transformer wires = 1
Across the two orange transformer wires = 0
Across each of the fuses both = 1

So that looks like both fuses are blown.

For the blue and white wires, are you sure that the metal tips of the meter probes were touching the metal contacts in the plug?
To check, connect the meter probes to the tags on the transformer that the blue and white wires are connected to.

 

update, all fuses show = 0

 

but tested again and tried with tips touching metal contacts on transformer

Across the blue and white transformer wires = 1
Across the two orange transformer wires = 0
update, all fuses show = 0

 

but tested again and tried with tips touching metal contacts on transformer

Across the blue and white transformer wires = 1
Across the two orange transformer wires = 0
update, all fuses show = 0

The fuses are OK then.
As a final check on the blue and white wires, set the meter switch to the 20K position and check again. If it still reads '1' then the transformer primary is open circuit and you will need a new transformer.

 

The fuses are OK then.
As a final check on the blue and white wires, set the meter switch to the 20K position and check again. If it still reads '1' then the transformer primary is open circuit and you will need a new transformer.

Ok I tested again the blue and white contect and it read 1

interestingly I connected red/black tips to 240/220, then 220/120 then 120/100v and they all read 0
but when I connect directly the tips to '0' and either 100/120/220/240v it shows 1

 

update
connecting 240 to 220 = 0.01
connecting 220 to 120 = 0
connecting 120 to 100 = 0
connecting '0' to the one next to it also with white cable coming from inside = 0
but connecting '0' to any of the contact 100 through 240 = 1

 

update
connecting 240 to 220 = 0.01
connecting 220 to 120 = 0
connecting 120 to 100 = 0
connecting '0' to the one next to it also with white cable coming from inside = 0
but connecting '0' to any of the contact 100 through 240 = 1

So it looks like the transformer blew to protect the fuses - that's not the way it's supposed to work

 

If you want to use it 240V power then you need a new transformer.

 

so I guess I need a new transformer.

As Im in the UK I only need 220/240v?

would anyone be able to assist in selecting a decent budget replacement (Im in th eUK).

 

7V is not a standard voltage so a direct replacement is unlikely and without a schematic it would be difficult to guess at the effect of a different voltage. It is also possible that the higher voltage has damaged other things.

One possibilty would be to find another unit and maybe make one working unit out of the two.

I think I would connect a 6V transformer and see whether it does anything. This will definitely do no damage but it may not work properly on the lower voltage but it would tell you whether other things have been damaged.

Any other ideas/opinions out there?

 

So that looks like both fuses are blown.

For the blue and white wires, are you sure that the metal tips of the meter probes were touching the metal contacts in the plug?
To check, connect the meter probes to the tags on the transformer that the blue and white wires are connected to.

Huh? Reading 0 across a fuse means it is good!

Bob

 

Huh? Reading 0 across a fuse means it is good!

Bob

Yes fuses seem fine but transformer read = 1
I just now need to try and source a replacement. I have attached the original service schematics plan, if any one can make sense of it