ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
Hi guys and girls,
Thanks for all your work and input on this beautiful site.
Last week 've bought a Beosystem 5000 with al kinds of problems.After searching the forum and trying all kinds of suggested solutions i'v made some progress but there are still a lot of issues to be solved.
Beomaster 5000Looks good, needs cleaning. No MCP thats a handicap.Hooked up my old Beovox S45 speakers. (New foam and capacitors)
Beogram 5005After some cleaning it spins but the arm sometimes skates and it sounds terrible on the Beomaster.Maybe its the MMC4 cartridge but because of the 7 Pins DIN I can't test it on my Quad 33.
Beogram CD 50The drawer was stuck and did nothing. Again cleaning and the drawer is working.Now the drawer is going in and out without stopping. When manually closed the CD starts spinning and the counter starts running but it seems there is no sound.
Beocord 5000Looks almost new inside but does not rewind and also terrible sound
Any suggestion or advise to fix the problems described above would be nice, thx Johan
First help:
If the cable of the BG5005 is still original, you can screw out 2 of 7 pins and test the Beogram with other receiver...
Regards,
Theomaster
Vintage Bang & Olufsen
Thx for the swift respons And briljant to make a convertible DIN plug.
I've tested the BG5005 on my Quad. The sound is much better but not good.
The terrible sound could be from the BM so i hooked up my NAD CD.The sound is as terrible as from the BG.Maybe its the BM or maybe the Beovox S45 speakers. I will test this later with some Tannoy speakers.
Best regards, Johan
I looks like a capacitor problem on the BM.After powering up it takes about 1 minute to produce any kind of sound.The sound improved a few minutes later but still no B&O quality.More like an old AM radio Can this be fixed anyhow?
It looks like a capacitor problem on the BM.After powering up it takes about 1 minute to produce any kind of sound.The sound improved a few minutes later but still no B&O quality.More like an old AM radio Can this be fixed anyhow?
Any old B&O can be serviced if you want to have it done. It is worth it in the long run but the price depends on the units themselves individually.
It sounds like you are from Sweden or so? I will sugest getting hold of the administrator Dillen/Martin here as he knows these old B&O units better than most and can service them as they should. It sounds like its time for this Beosystem and the main reason for people giving it up.
You can try to search for MCP5000 on www.dba.dk and see if any turns up. I have seen a few there.
JohanU: It looks like a capacitor problem on the BM.After powering up it takes about 1 minute to produce any kind of sound.The sound improved a few minutes later but still no B&O quality.More like an old AM radio Can this be fixed anyhow? Best regards, Johan
If you are a handyman, know something about electronics, and can solder, it is possible that you can fix it yourself, Martin normally can provide caps, lamps and other items you will need. First thing is to get the repair manuals and drawings, then after considering your problems, contact Martin and he will help you with parts and how to.
Collecting Vintage B&O is not a hobby, its a lifestyle.
Thx Friedmett,
I think i'am going to focus on the BM which i want to use in my office. I will open it today and see how it looks on the inside and let you guys know if i have more questions.
Regards, Johan
Hi Søren,
I'm not a real handyman but i have a solder bolt It will depend on how difficult this job is going to be wether i'm going to do this myself.First i'am going to look on the inside.By the way, i am Dutch.
Removed the cover and the BM looks surprisingly good on the inside.I going to download the service-manual this week and try to figure out what is what.
Will be continued later this week.Thx and regards Johan
Hi everyone,
OK, I think i'am ready to take on the adventure.I've read just about everything there is to find about the Beomaster 5000 and the rest of the system. Some i understood, a lot of it not. But i'am willing to learn.
So for the next step(s) some advise is needed.
Symptoms after testing with NAD CD541 and a set Beovox S45 (1983).It takes the BM5000 some time to produce any kind of sound, after that the sound quality is poor and volume is low.When the volume is at about 4.0 the quality is almost reasonably, at 6.0 its really terrible.
Is this a capacitor problem or something else?
I was thinking about repairing the BM5000 step for step so hopefully i hear the sound improving with each step.Is this a good idea or will some old elements suffer damage?
Thanks in advance and regards,
Johan
Johan:It takes the BM5000 some time to produce any kind of sound, after that the sound quality is poor and volume is low.When the volume is at about 4.0 the quality is almost reasonably, at 6.0 its really terrible.
Could be simply bad contacts in the muting relay. First, try the second pair of speaker outputs if they sound any better (those don't go through the relay at all).
If they do, keep exercising the muting function on and off. If you're lucky, the contacts will clean themselves when they see some use and that problem will be solved, possibly for a long time.
--mika
Hi Mika,
Thx for this tip.I just tested the difference between speaker output 1 and 2 but the quality and volume is the same on both outputs.Maybe this is something between my ears but it seems like the sound is better then yesterday, still not good or excellent.Exercising the mute relay didn't improve the sound though.Until volume 2.0 there's no sound at all, at 3.0 there is some sound, at 4.0 reasonable sound, at 6.0 terrible.What can I do to make her sound pretty again?
Hi Johan
about relay should not so difficult change with new One but more probably if there isn't sound at volume 2.0 may be a problem with volume control or output cond if present
Hope this help
MArco
Hi Mika and Marko,
Yesterday i have been pressing the mute for about an hour.There is definitely some kind of failure or malfunction in the mute relay. Sometimes when un-muting the left or right speaker is silent and sometimes the volume changes.Exercising the mute didn't improve this.
Should i replace de mute-relay or exercise the mute more?Where can i find one?
Thx and regards, Johan
replace mute-relay probably you can find one in an electronic shop, desolder the original and show it in the shop should be the best way
HTH!!
Martin, Dillen on the forum, can provide a relay
Hi Søren and Marko,
I will definitely ask Martin or Dillen for the right relay but i have discovered some other symptoms.
The speaker set 2 has the same symptoms as set 1 and that should not be affected by the relay.So sound starts at 2.0, low volume and poor quality.
And as of today i'am also a proud owner of a MCP 5000. I found one one dutch-ebay (marktplaats) for only 30 euro in perfect condition.I'am a really luck b...... It connects to the Beomaster and all functions are working except for the bass/treble adjustment.
Somehow something tells me these volume/sound problems are related and are not caused by the relay.(The relay should be replaced anyway i think)
Any ideas about bass/treble not adjusting?
First thing is to change the relay, after changing that you can start looking for the other failures, clean all plugs and jacks, checking that you have all the DC voltages right. You will need the manual for that, Available here for silver and gold members.
Replace the small electrolytic capacitors in the voltage regulator area between the cooling fin andthe mains transformer.There is about a handful of them, 10uF and 22uF.And the muting relay as already suggested. (That's the relay nearest to the socket bay - not the one near the transformer).
Martin
The speaker set 2 has the same symptoms as set 1 because use same relay and also headphone output.
About bass/treble adjiustment could be more complicated because signal pass trough some resistors/caps , one IC for DC Control and finally arrive to output ampliflier
First of all check or much better replace C6 and C12 (22 uF) with fresh caps and after hope you'll can hear right volume!!
Otherwise you can make a simple check of voltage (20 volt DC) on bass/treble potentiometer.
Let us know!!
marco: Hi Johan The speaker set 2 has the same symptoms as set 1 because use same relay and also headphone output. MArco
This is not correct, I'm afraid;- Speaker set 1 is meant for local speakers (speakers in the same room as the Beomaster).They can be muted directly on the Beomaster and local remote controls.Speaker set 1 uses the muting relay in the Beomaster.-Speaker set 2 is meant for looping through to other rooms through Beolink.These speakers are muted by each their local Beolink box by the remote control in the given room and/ordirectly on the Beolink eye. These speakers use muting relays in their local Beolink box.
Connecting headphones will only mute the local speakers (Set 1), it will not affect speakers in other rooms.
Hi Martin
many thanks that you have correct me probably my eyes hasn't help me wiewing schematics
Hi Guys,
When looking for the caps op the PCB's i found the relay next to the transformer was dirty.I took of the plastic and there was something that looked like salt and there were burn marks on the plastic box.Is this the relay for the fan and is this something to worry about?
This relay switches the amplifier power on/off.Even a brand new relay will very soon look old and dirty but the current draw is quite high so the contacts will burn freeof oxidation by themselves and it practically never fails.Don't clean anything, just put it back together, it'll be fine.
The fan is thermally controlled.
Thanks Martin. I've should have looked for it in the schematics myself but found it now.
Some questions about the caps. Again i'am not a real technician but i want to learn.MArko advised me to replace the C6 and C12 caps with 22uF.Martin advised almost the same but with 10 uF and 22uF.In de service-manual C6 has a value of 470pF 10% 100V and the C12 4,7nF -20%+80% 40V.
Why replace them with 22uF?Which voltage should they be?Maybe these are stupid questions and someone can explain this to me.
This time i've openend the Beogram 5005.Initial symptoms are poor sound, skating and ticking servo.Of course there is some cleaning and lubing to do. Also the belts should be replaced.
I think to sound quality has much to do with the MMC4 cartridge and the skating will somehow be adjustment i think.My first problem to solve is the ticking servo. I have unmounted the servo but it looks like there is a PCB attached to it.
Is the ticking servo a problem that can be fixed or can it be replaced?
I am really stuck here.The servo (part 8400126) of the BG5005 is broken.I've read this servo is used in a lot of Beogram types but i can't seem to find which ones.Maybe i can find a damaged Beogram and use it for spares. On ebay the servo alone goes for more than 100 €.Can someone tell me in which Beograms this servo is used?
Also i'm still confused about the caps in the Beomaster.Who can explain why 22uF is used instead of the specs from the manual?
Thanks in advance, Johan