BeolabPenta MK2 standby issues

6 replies
AL
Offline
alf
Bronze
Posted October 1, 2024 at 03:00 GMT
#1644021
Hi All,

one of my Beolab Penta speakers does not switch back to StandBy when the source is turned off.

the pair is connected to a Beomaster 7000 via Powerlink.

would someone kindly throw a view pointers at me - I was hoping to avoid dis-assembling the amplifier

but that seems like wishful thinking…..

Thank you

ALF
AL
Offline
alf
Bronze
Posted October 1, 2024 at 06:53 GMT
#1666637
Perhaps to be more specific: i can turn the speaker off to Standby manually though !

ALF
AL
Offline
alf
Bronze
Posted October 4, 2024 at 10:45 GMT
#1666712
I am amazed, no one dares to comment constructively ☹️

not even BeolabPenta experts ??

Come on guys…..

ALF
AL
Offline
alf
Bronze
Posted October 27, 2024 at 01:08 GMT
#1667056
Thanks for all the replies, much appreciated 😁

the Penta surprisingly have recovered without explanation.

ALF

PS: i wonder if the “old forum” as I know has died ?!
HO
Offline
Homersaurus
Bronze
Posted November 8, 2024 at 18:09 GMT
#1667176
If the problem becomes persistent and on all sources, then you may have a problem with the PCB 2 Control board in the Penta.

Specifically a transistor BC 337-40; it switches the Penta on and off dependent on an incoming signal.   There are more detailed

articles on the old forum that describe how to replace the transistor and where it is exactly; you would need soldering iron skills.

The BC 337-40 transistor was readily available 3 years ago when I suffered the issue.

 

See /forum/the-workbench/beolab-penta-2---constant-of-green-light-and-will-not-go-into-standby-and-no-sound---need-help but there are more and better articles in the old archived forum(s).

Keep your fingers crossed that your transistor is not failing - unless your issue was a one off problem caused by a signal source problem.

 
AL
Offline
alf
Bronze
Posted November 9, 2024 at 01:29 GMT
#1667180
Thank you kindly for your reply….well, what can I say ?

I suspected amongst other possibilities a flatband connector issue and tried to open the flap-cover without taking the whole amplifier off the penta.

I could not totally open that cover housing pcb 2 but it might have had a strange impact to a degree that the penta now switches back to stand-by….figure that ?!!

i will keep in mind that very transsitor - thank you for that

ALF
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