Welcome to the forum, I made my BM 4000 a couple of years ago, here the thread. I changed all the electrolytic caps, all the trimmers and lamps, some of the end amp transistors.

First of all I would check the supply voltages and idle current, if you have a scope try to find out where the FM signal disappear.

The trimmers on your pics looks very bad so probably you will find some problems there.

I got everything I needed from

I love the high resolution pictures. Thanks for posting those. As Søren said, an overhaul is due on that receiver and Martin (Dillen) can supply a kit for that.

-sonavor

aristomuy wrote:

The problem with the Beomaster 4000 is that the radio function doesnt work, it just sounds like static and none of the presets or the slider change it. i had a quick look inside and didnt see anything that wasnt attached so i thought id ask here. 

here is demonstration video by the people i bought it from:  

Thanks for the responses guys. That video was made by the people I bought it from so I'm not sure if they used an antenna. I did plug my TV antenna into it which is a rabbit ears antenna that is in the attic and I plugged it in to the community antenna socket. Is that the correct way to do it?

Is there a downside of not giving it an overhaul as in its current state as just an amplifier I can't fault its functionality, there is no difference in volume in each channel and it sounds perfect and I don't want to risk ruining that, I know ill have to at some point though.

Could the radio problem be because of bad capacitors? I don't see any electrolytics on the radio side so I didn't think so.

Is there any faults you guys have heard of before that I could check?

Thanks for your help with this,

Ethan.

The antenna is OK, normally you will only need a wire strip if you are near the sender, I see on the FM PCB some bad trimmers and at least one cap, and 2 or 3 black drop formed transistors that I would change.

On the the preamp PCB you will find more bad trimmers and some caps.

Your sound will not be worse changing caps, in mine at least the half was way off specs, even when the cap looked good, these ROE caps are known to cause troubles, and better change them now, than wait until they go totally bad and maybe destroy other components

Looks like one or two of the skeleton trimmers have already been replaced at some time, they all look suspect and you should change them soon as possible, you can also see some of the caps are leaking........how do the big power supply smoothing capacitors look? I have had a BM4000 that had some leaks from these too. I dont know if this will cure your radio problems (probably not) but it will certainly be a good move for preserving the functionality you currently have, Post some pics as you go on ;¬)

Craig

Thanks for the responses. If I change the trimmers how will I know where to set them back again?

Also could the problem with the radio be that some of these are set incorrectly?

The large capacitors by the mains side didn't look leaky, the transformer does hum but it doesn't really bother me.

Today when I turned it on the switches weren't working correctly as shown in this video I took: 

Most of the trimmers can be set according to the manual, with the help of a good DMM (Digital multi meter) on some of them you will need more sophisticated instruments. Before I got my scope and function  generator. I checked the trimmer settings after desoldering and set the new ones to the same. I do the same with all trimmers if the old ones are set near the middle not totally to max or min.

The switch problem is probably just a good cleaning and lubricating of the mechanics

The big caps are probably OK but I would change them anyway, Remember you will have to change all the ROE caps anyway so why not go for them all (all electrolytic caps)

If you dont know anything about electronics, has no soldering skills, has no tools or instruments you should stay away from it, and find someone who knows

Such high noise level means that the IF probably is working as it should.

I would suspect the tuning voltage.The first thing to check is the 22V stab TR10.