Quad FM 4 not working.

Mikeymoo

Member
2015-02-03 1:18 pm
Hello, wondering if anyone out there could advise me on how to get the tuner up and running. I've got a QUAD FM 4 tuner that is not powering up. Have checked the fuse which is ok and have replaced the Rifa cap that was bulging. Have power up to the transformer so not the on/off button. I've got an analogue meter and very keen to try to sort problem(s) myself but just need some guidance if possible. Regards
 

Mikeymoo

Member
2015-02-03 1:18 pm
Ok. Did some more checking at the end of the windings and still no voltages except the very low one. Used an analogue meter on ACV. So I'm presuming that it isn't a dry joint as checked on the pcb and also the end winding coming out from the transformer. They are soldered onto the pcb. So what now? Do you suggest that I desolder the transformer and check visually? I think this is the 2nd transformer as had it serviced a few years ago and they replaced the original. Thanks for the help.
 

Mikeymoo

Member
2015-02-03 1:18 pm
It's a smallish transformer so I doubt that it has a fuse. There is a fuse just under where the socket is. This fuse is good as that was the initial problem. So progress of sorts?!? What might be the 'other problems'? I've seen a site in Belgium that has the transformer but at €64.00 I didn't really want to take a punt and blow or short it out. Was hoping that I could find the equivalent transformer here in Portugal but don't know what it's rates at. What else do you think that I should do? Cheers
 

Mikeymoo

Member
2015-02-03 1:18 pm
Right, so take the transformer out, check if it has a fuse. If not, then put the meter on it to get the resistance (Ohms). Can I do this before removing it? Will the ohms give me a guide should I purchase a new transformer or is it not that simple? It's on 240 volts but there's 2 primary's and 3 secondary's. So does this make it difficult to get the equivalent one? Thank you for your patience.
 

Mikeymoo

Member
2015-02-03 1:18 pm
Rayma, I've just removed the transformer and can see that it's burnt out hence tuner not powering up. I will try and source a new one here and replace it and hopefully hey presto it's all go. Trouble is I haven't been able to find out exactly what the values are of it. Tried looking for it on the net but haven't had much luck. Any idea's where I might get some info?
 

rayma

Member
2011-04-29 8:37 pm
Rayma, I've just removed the transformer and can see that it's burnt out hence tuner not powering up. I will try and source a new one here and replace it and hopefully hey presto it's all go. Trouble is I haven't been able to find out exactly what the values are of it. Tried looking for it on the net but haven't had much luck. Any idea's where I might get some info?

Quad. Again, this is beyond what you should be doing. Very dangerous.
 

PRR

Member
Paid Member
2003-06-12 7:04 pm
Maine USA
www.diyaudio.com
Listen to Rayma. Aside from the considerable risk of working with 230V mains power, I can estimate some of the specs, but not enough, and I have never seen a commodity transformer much like this. I could cobble it up out of 2 or 3 transformers but it would not fit the case. This had to be a custom part. You will get it from Quad, or a Quad specialist, or not at all. If that does not work out, _I_ would put it to auction as "Not working, for parts only". There is some market for such items.