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
Hello there,
I just bought a very nice Beomaster 2400 (remote missing) for a nice price. I took it home and it was working all right, some light were blown and the sliders were scratchy so I began to take it apart.
I cleaned everything, changed some of the lights taken from a dead Beomaster 1900 I kept for parts and when I put back the sensi touch panel I didn't realize I had power switch on... I heard the relay go back and forth about ten times until I switched it off.
When I tried to switch it back on I had absolutely nothing, no power, no red led... The fuse are ok and I wonder what I should check next... I feel absolutely stupid.
Any advice welcome guys :)
Bonjour !
You should check the regulated PSU bridge rectifier. These old components are troublesome, and sometimes found with one or two bad diodes.
Jacques
Salut !
I've got 22.2 V and 43V at the entry of the relay and nothing at the rectifier... I think the relay is fried. I'm reluctant to harvest the one on my 1900 because I still think I could revive it in the future.
Once again, I was wrong... I've changed the relay and still no improvement, the Beomaster stays dead. Any idea is welcome ! :)
Check if there is power between pin 9 and 10 from the transformer, if yes, check the rectifier D50 and fuse F1, this is the 15V supply for the relay
Collecting Vintage B&O is not a hobby, its a lifestyle.
So sorry, I'm probably a dumbass but I can't find 9 and 10 on the board. I see 6, 8, 6a but no 9 or 10. I've tested F1 and it is fine and if D50 is the rectangular rectifier I can say without a doubt that it does not receive any current. Anyway thanks for your answer and your patience :)
Check your drawing, D50 is the rectifier for the power for the relay power on,
The manual is available on site for silver and gold members
Yes, this is the one I mentioned in my first post. Thanks Søren for the diagram, but Jean, do you have knowledge in electronics? If not, just tell us, because we will provide more detailed instructions
Yes, that's the one!
Thanks a lot guys, I was checking the wrong rectifier...
So, what I've done so far :
-mesured 17.55V AC accross 9 and 10-F1 is ok-D50 seems fine-22.5V DC out of D50 and accross C92
@chartz I've basic electronic knowledge and soldering skills. Just enough to mess things up :)
Perhaps you should switch AC input over to 240V, 22.5V is a little high.
Does DC regulation work?
When switching on does the relay pull shortly and then goes off again ?
@Soren : No, no sound or movement from the relay whatsoever. I tried earlier with a different one, same result.
@Chartz : I've switched to 240v and now its 16,3V AC across 9 and 10 an 20,9V DC after the regulator. I've desoldered and tested the regulator and every diode is ok (about 590 Ohms in one direction and infinite resistance in the other).
Thanks again guys !
What do you get at TP15, in standby and with with FM 5 on
Hello Søren,
the Beomaster won't go in standby so I can't switch FM5 on, the standby red led won't light up. I've got 0V DC between TP15 and ground...
Bonjour Juanito,
Je vois que tu habites Paris, je suppose qu'on peut donc discuter en français?
Je viens de remettre en état un Beomaster 2400 que j'ai acheté neuf en 1976.
Il ne fonctionnait plus mais maintenant il marche comme au premier jour, donc très bien!
Si tu n'as pas de connaissances en électronique, ça va être un peu rock&roll pour dépanner l'appareil.
Il y a plusieurs alim, +31V,-31V, +15Vstby, +15V, 28V, 12V
Un bon point de départ consiste à se procurer le schéma et à vérifier toutes les tensions
Commence par dans l'ordre :
En stby il faut 15.7V sur TP16 ; rien sur TP15( qq mV)
Si il a 15V sur TP15 il y a de grandes chances que TR32 est défectueux. C'est un BC183 à changer.
Les composants ne sont pas facile à trouver sur le circuit imprimé, sur le schéma il y a les coordonnées (TR32 est en F1, comme à combat naval)
Bonne chance