MCL2 AV no 5,5V

18 replies
MA
Madskp
Gold
1759 posts
Posted February 4, 2023 at 12:53 GMT
#687213
I have aquired a MCL2 AV for some testing purposes. first test of it with 15V power, tranciver, speakers in powerlink socket, and beocord 3500 in tape socket. No reaction to remote. No led light in the tranciver. tried to do some measurements, and there is no 5,5V after IC20 I got 11.6V before IC20 where the servicemanual says 10.6V i got 12V after IC21 and 6V after IC12 asit should be any clues what to look for?

Location: Denmark

MA
Madskp
Gold
1759 posts
Posted February 5, 2023 at 11:06 GMT
#698611
Am I right in assuming that the MCL2 AV will start up and work stand alone without connection to a MCL master?

Location: Denmark

Guy
Guy
GoldModerator
4508 posts
Posted February 5, 2023 at 11:22 GMT ? Edited February 5, 2023 at 11:29 GMT
#698612

Location: Warwickshire, UK

My B&O Icons:

BeoCenter-9500.png BeoCenter-9500.png
Beoremote-Beo4.png Beoremote-Beo4.png
Beovision-10.png Beovision-10.png
Beotime.png Beotime.png
Beosound.png Beosound.png
Beosound-Explore.png Beosound-Explore.png
Beosound-Essence.png Beosound-Essence.png
Beoplay-P2.png Beoplay-P2.png
Beoplay-M3.png Beoplay-M3.png
Beoplay-H4.png Beoplay-H4.png
Beoplay-H3.png Beoplay-H3.png
Beoplay-Form-2i.png Beoplay-Form-2i.png
Beoplay-Earset.png Beoplay-Earset.png
Beoplay-A2.png Beoplay-A2.png
MA
Madskp
Gold
1759 posts
Posted February 5, 2023 at 11:47 GMT
#698614
Yes thats the way cabling should look like in a man cave ? I dont have the original PSU so I am using a bench power supply with wires soldered to the PCB. It should be ok as I am getting the right voltage levels other places on the board except that 5.5V that is not showing up.

Location: Denmark

Guy
Guy
GoldModerator
4508 posts
Posted February 5, 2023 at 12:02 GMT ? Edited February 5, 2023 at 12:03 GMT
#698615
Have you checked the connection/wiring of the IR eye?  I think that is one of the 'users' of the 5.5V supply, hence could be shorting it out if wired incorrectly?

Location: Warwickshire, UK

My B&O Icons:

BeoCenter-9500.png BeoCenter-9500.png
Beoremote-Beo4.png Beoremote-Beo4.png
Beovision-10.png Beovision-10.png
Beotime.png Beotime.png
Beosound.png Beosound.png
Beosound-Explore.png Beosound-Explore.png
Beosound-Essence.png Beosound-Essence.png
Beoplay-P2.png Beoplay-P2.png
Beoplay-M3.png Beoplay-M3.png
Beoplay-H4.png Beoplay-H4.png
Beoplay-H3.png Beoplay-H3.png
Beoplay-Form-2i.png Beoplay-Form-2i.png
Beoplay-Earset.png Beoplay-Earset.png
Beoplay-A2.png Beoplay-A2.png
MA
Madskp
Gold
1759 posts
Posted February 5, 2023 at 12:17 GMT
#698619
Hi again and thanks for the hint. the problem persists without the IR eye connected, so may not be that. Right now im suspecting an SMD transistor

Location: Denmark

MA
Madskp
Gold
1759 posts
Posted February 5, 2023 at 15:07 GMT
#698621
Guy, is there a pin connection drawing on the PSU for your MCL2-AV if you have it handy? thsnks in advance

Location: Denmark

Guy
Guy
GoldModerator
4508 posts
Posted February 5, 2023 at 15:36 GMT
#698622
Here you go:  (I am getting better at finding things!)

Location: Warwickshire, UK

My B&O Icons:

BeoCenter-9500.png BeoCenter-9500.png
Beoremote-Beo4.png Beoremote-Beo4.png
Beovision-10.png Beovision-10.png
Beotime.png Beotime.png
Beosound.png Beosound.png
Beosound-Explore.png Beosound-Explore.png
Beosound-Essence.png Beosound-Essence.png
Beoplay-P2.png Beoplay-P2.png
Beoplay-M3.png Beoplay-M3.png
Beoplay-H4.png Beoplay-H4.png
Beoplay-H3.png Beoplay-H3.png
Beoplay-Form-2i.png Beoplay-Form-2i.png
Beoplay-Earset.png Beoplay-Earset.png
Beoplay-A2.png Beoplay-A2.png
MA
Madskp
Gold
1759 posts
Posted February 5, 2023 at 15:56 GMT
#698623
Thank you very much. Then I can rule out errors regarding these specifications

Location: Denmark

Guy
Guy
GoldModerator
4508 posts
Posted February 5, 2023 at 16:00 GMT
#698624
Not sure if this helps - I think this is quite a late model without the passive speaker or RF connections.  The label says Type 2032.

Location: Warwickshire, UK

My B&O Icons:

BeoCenter-9500.png BeoCenter-9500.png
Beoremote-Beo4.png Beoremote-Beo4.png
Beovision-10.png Beovision-10.png
Beotime.png Beotime.png
Beosound.png Beosound.png
Beosound-Explore.png Beosound-Explore.png
Beosound-Essence.png Beosound-Essence.png
Beoplay-P2.png Beoplay-P2.png
Beoplay-M3.png Beoplay-M3.png
Beoplay-H4.png Beoplay-H4.png
Beoplay-H3.png Beoplay-H3.png
Beoplay-Form-2i.png Beoplay-Form-2i.png
Beoplay-Earset.png Beoplay-Earset.png
Beoplay-A2.png Beoplay-A2.png
or
BeoWorld Gold Membership card
Join BeoWorld

Register to access the forums, reference material, and exclusive member benefits — including our monthly prize draw.

Become a Member

December 2026 Prize Draw

Gold Members Only

As a Gold member you're automatically entered into our exclusive prize draw — your chance to win iconic Bang & Olufsen products. A unique benefit of BeoWorld Gold membership, every draw brings a new opportunity to win something special.

View Prize Go For Gold
BeoSound Level

1st Prize

BeoConnect Core

2nd Prize

BeoRemote Halo

3rd Prize