Beocenter 9300 No Life - almost

19 replies
filip_kbh
Offline
filip_kbh
Bronze
Posted April 10, 2024 at 09:41 GMT
#1643552
I just picked up a BC9300 for 15 GBP, advertised as defect but with a relay clicking.

True enough - I just connected it to mains, and I hear a click from a relay. Other than that, there is no stand-by light. I have opened the unit (the glass panel was of course loose, so I took that off), and I see no obvious signs. Is there a known problem, like e.g. cracked solder joints around a certain capacitor that I should look for, or should I start by seeing if I have the correct voltages as per the service manual?

Location: Copenhagen

AU
Offline
auric
Bronze
Posted April 11, 2024 at 00:52 GMT
#1664034
Check the fuses behind the cover where power cord goes into the unit.

But always inquire why the fuses blew in the first place!
filip_kbh
Offline
filip_kbh
Bronze
Posted April 11, 2024 at 10:10 GMT
Edited April 11, 2024 at 10:33 GMT
#1664039
I have the correct voltages from the transformer. On the standby board I also have correct voltages except for P90 pin 1. It's supposed to be 7.8V as I read the schematic (it says '7V8 unregulated') but I measure approx. 24V.

Location: Copenhagen

filip_kbh
Offline
filip_kbh
Bronze
Posted April 11, 2024 at 15:49 GMT
#1664043
Is the relay on the standby board supposed to click? Because mine doesn’t say a click.

Location: Copenhagen

filip_kbh
Offline
filip_kbh
Bronze
Posted April 11, 2024 at 16:14 GMT
Edited April 11, 2024 at 17:29 GMT
#1664044
.

Location: Copenhagen

filip_kbh
Offline
filip_kbh
Bronze
Posted April 11, 2024 at 17:35 GMT
#1664046
All fuses were good.

Location: Copenhagen

filip_kbh
Offline
filip_kbh
Bronze
Posted April 11, 2024 at 21:49 GMT
#1664053
I guess I should have started by checking the battery:



There was only one trace that was broken, so I fixed that. Those batteries are a ticking time bomb ?

 

 

Location: Copenhagen

MA
Offline
Madskp
Gold
Posted April 12, 2024 at 07:28 GMT
#1664058
Yeah those batteries can make a mess.

I don’t know if it is just the picture, but it looks like there is a crack in the diode D5

Location: Denmark

Guy
Offline
Guy
GoldModerator
Posted April 12, 2024 at 08:28 GMT
#1664059
I have just replaced the battery in the electronically similar BC2300 - see thread here:

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
filip_kbh
Offline
filip_kbh
Bronze
Posted April 12, 2024 at 09:33 GMT
#1664062

Location: Copenhagen

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