Beomaster 5000 - front panel passive and 'no transmission'

I am new in the forum, hello beolovers, and thanks for any help offered.

I recently aquired a set of 4 Red Line 60 loudspeakers. Along with them I got a Beomaster 5000, a Beocord 5000, and a Master Control Panel 5000.

The speakers was my main interest. They are all with deteriorated mounts of the bass reflex plates. I have made an improvised repair of the mounts in 2 of the speakers.

The Beomaster 5000 I tested by connecting with the RL60 speakers and a Beogram 1902 :

Sound from both speakers, middle-low volume.

Display on the BM 5000 read 'loudness' 4.8

Display on the MCP 'no transmission'

There was no reaction when pressing the contact areas on the front panel of the BM. I was able to open the panel, and none of the buttons gives any response.

After reading related posts, I checked the ribbon connection to the front panel, and it looks ok.

So the amplifier (I don't need the tuner ) works, but is beyond control, what should I do next ?!

thanks

 

oh, no comments at all, not even "it is dead, let it rest..." ?? 

Never let it rest. The Beomaster will benefit from a full refurb. You can order a capacitor kit from member 'Dillen'. This may well fix many of the issues. Reflowing solder joints can help as cracks do appear. It's an old unit and needs some TLC.

Dave.

thanks for your encouragment, Dave !

I posted in the hope that someone would give a pointer on how to proceed.

The fact that the input from the turntable gets through to the loudspeakers gives some hope, (inlaid question: can the capacitors be bad under these circumstances?) so my first point of entry would be the control mechanism (leaving the master control panel aside as a separate issue).

The older sets (as the BM 901 I am using now) has the mechanical regulators, but this is another animal !

so, as (one) effect of the defect is no function of the front panel (not opening, not  turning off and on) what can I do to establish the repair needed.?

It seems like quite a mouthful for the layman mechanic, -had that damned amplifier just not delivered sound to the speakers !! 

jebsign

There are lots of capacitors in these units. The fact you get something is encouraging. Do a full recap with a kit, clean the inside PCB's and reflow joints and check for voltages according to the service manual and adjust. The cap kits from Martin (Dillen) have good instructions and diagrams.

One of my 5000 units is dead after I actually heard a capacitor blow it's top a while ago, and saw the accompanying puff of smoke.

Dave.

Thanks again Dave, -a little noise is ok but smoke, oh no!

I'll try to find a way to check the connection to the front panel, as that seems to me to be the main issue. I´m not capable of taking on the full restoration project at the moment.

Or i could go to the Horse´s Head for help, after all I´m only 35 kilometers away from Struer!

Thanks again for your kind comments.

jebsign

 

If you really want this looked at, you could contact member 'Dillen' in Copenhagen.  He's really busy with restorations/repairs but may be willing to take a look for you?

Frede at Classic Audio (just around the corner from you too) may be able to suggest someone local to you who could help.

Dave.

I think that´s the way for me, I really would like to put it where the Beomaster 901 is now, although that one is doing a good job, and been doing (with a tiny repair along the way) since I got it in the early 70´s.

Also, stored for future fixing is a Beomaster 1900 and a Beogram 8002. So time commitment is just around the corner! 

you have been most helpful, thanks and the best of Sound to you!

jebsign