Grundig Mandello no power

[Stephen82]

Hi Guys

Hopefully someone can help I have a grundig mandello and I was using it this morning before I took my daughter to school I've come back and now it won't turn on it doesn't matter which switch you press nothing happens so I took out the chassis a sprayed the switching mechanism with wd40 contact cleaner and it's made no difference apart from making the vhf button stick any ideas what to do

Thanks
Stephen

[Station X]

I assume you've checked the fuse in the plug, assuming that plugs in Jersey have fuses, and any internal fuses within the unit?

[Station X]

Link to circuit in this thread:-

https://www.vintage-radio.net/forum/...d.php?t=118110

It'll blow up quite nicely if you save it.

----

Do the valves light up?

If you have a meter measure the resistance between the LIVE and NEUTRAL pins of the mains plug. With the player unplugged and switched ON of course!

[Stephen82]

Originally Posted by Station X

I assume you've checked the fuse in the plug, assuming that plugs in Jersey have fuses, and any internal fuses within the unit?

The plug is fine as it has a red light on the plug which is lit I am trying to find someone who sells the 1amp mains fuse over here but not having much luck does the fuse going normally happen after you turn it off

[Station X]

Fuses normally blow at the instant a set is switched on or while a set is switched on.

I assume the 1A fuse is an internal one? Have you checked it visually or with a meter?

Fuses sometimes get tired and let go, but it's possible there's a fault which has caused a fuse to blow.

Do the valves light up?

[Stephen82]

Nothing happens when you press the buttons the radio back light the turntable it's all dead

[Station X]

The fact the turntable doesn't work points to a fault with a fuse, the voltage selector or the mains switch.

The easiest of these to check and replace are the fuses. Do you have a meter?

[Edward Huggins]

If it is for the 13A mains supply plug, you can use a 2A or 3 A fuse, not essential to have a 1A.
Not quite sure when you say there is a "red light on the plug", do you mean the socket?

[Stephen82]

Originally Posted by Station X

The fact the turntable doesn't work points to a fault with a fuse, the voltage selector or the mains switch.

The easiest of these to check and replace are the fuses. Do you have a meter?

I don't but I can get one

[Stephen82]

Originally Posted by Edward Huggins

If it is for the 13A mains supply plug, you can use a 2A or 3 A fuse, not essential to have a 1A.
Not quite sure when you say there is a "red light on the plug", do you mean the socket?

There is a red power light on the actual plug

[Station X]

The trouble is that we don't know whether the red light, probably a neon, is wired in before or after the fuse.

Remove the plug fuse and plug it in to the mains. If the light no longer lights the fuse is OK.

[Stephen82]

Originally Posted by Station X

The trouble is that we don't know whether the red light, probably a neon, is wired in before or after the fuse.

Remove the plug fuse and plug it in to the mains. If the light no longer lights the fuse is OK.

I have now replaced the plug fuse and no difference so I guessing the mains fuse would be next which I've had to buy from eBay because normal plug fuses are to big hopefully that will fix it otherwise I have no idea what to do next and I really don't want to part with my radiogram

[Edward Huggins]

Still, er, conFused....
If you have replaced the fuse in the mains plug, what do you mean by a "mains fuse"?
Do you mean an internal fuse on the actual internal metal receiver chassis?
I doubt whether there is much, or anything, wrong with your Radiogram, so don't worry.

[Station X]

Looking at the diagram there is a 0.4A slow blow internal fuse in series with the mains supply. That's for a 230V mains supply which I assume is what you have in Jersey?

If it's a glass fuse a visual inspection should show whether it's intact or not.

[ms660]

Just to note, there are several versions of the Mandello, some S.S. some valve.

Lawrence.

[Station X]

Indeed. My question "Do the valves light up?" got no specific response.

[ms660]

The S.S. version has a 1 amp fuse in the B+ side of the bridge rectifier not that that's conclusive.

All will be revealed no doubt.

Lawrence.

[snowman_al]

If it is the same Mandello with the FM problem, it is valve. (https://www.vintage-radio.net/forum/...light=Mandello)

It needs to be a 0.4A T (slow blow)...

Alan

[Stephen82]

Originally Posted by Station X

Indeed. My question "Do the valves light up?" got no specific response.

Hi Guys it seems I need to clear some things up my apologies for any confusion. The valves do not light up the whole thing is dead I have changed the fuse in the plug but am waiting for the 1A internal fuses to arrive as nobody in Jersey stocks them. Jersey has the same power supply as the UK and this is the same mandello with the FM issue I have had the chassis out and sprayed all the switches inside and out so there all clean I have also wise I was there cleaned the valve contacts. When I got this someone gave it to dump but instead I took it home and spent 3 weeks fixing the turntable and it's been fine for the last 5 year's it's my pride and joy and just want it to work but I don't understand fully how it works but I can solder and test parts if I need to. I hope this helps you all if you need pictures I can do that too

[snowman_al]

Originally Posted by Stephen82

... but am waiting for the 1A internal fuses to arrive as nobody in Jersey stocks them. ...

Hi Stephen,
Just a note of Caution here.
Why did you choose 1 amp fuses? The rear cover you pictured clearly states ''0.4A Surge Resisting'' for 240 volt mains. (0.4A = 400mA. Surge Resisting = Slow Blow = T rating = Delay Fuse by the way)

Fitting the wrong current rating fuse could lead to further damage or worse a fire.

Have you actually checked the original fuse has blown?

Alan