SOLVED !! Beomaster 7000 has suddenly become very silent

8 replies
NI
Offline
nitro2
Bronze
Posted August 23, 2025 at 11:51 GMT
#1644971
Hi forum ,

 

One of my beomasters 7000 became very silent last week ,

no sound from the attached cx50 speakers , and no sound from the beolab penta's ( connected via powerlink cables )

the bemaster 7000 powers up , i can use the 1000 remote to go through the functions , sources , tracks , and i can change the volume BUT the output is 100 % silent on all outputs .

Anyone who can shine a light on this
CharlieWednesday
Offline
CharlieWednesday
Gold
Posted August 23, 2025 at 12:51 GMT
#1670833
Have you tried plugging your CX50s into the Speakers 2 outputs instead of Speakers 1?  Let us know if they work that way.

Location: Liverpool

My B&O Icons:

BeoCenter-9500.png BeoCenter-9500.png
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Beoremote-One.png Beoremote-One.png
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That's odd, why is it doing that?
NI
Offline
nitro2
Bronze
Posted August 23, 2025 at 13:15 GMT
Edited August 23, 2025 at 21:08 GMT
#1670834
no output at all .

so pcb 7 is not the cause ( i think )

both right and left is missing on every output

 

 

 

 
lausvi
Offline
lausvi
Silver
Posted August 23, 2025 at 19:29 GMT
#1670840
Anything on the headphone out?

Is the white dummy-plug present at the Beomaster's LINE IN/OUT connector (below the speaker 1 connectors)?

Location: Helsinki - Finland

My B&O Icons:

Beoremote-Beo4.png Beoremote-Beo4.png
Beomaster.png Beomaster.png
Beogram-400x.png Beogram-400x.png
"Bang & Olufsen - A Life Less Ordinary" // "It's not magic, it's the Bang & Olufsen link system" // "It takes more upon itself, asks less of you. And a natural consequence of this is the simple and striking design. The true harmony of form and function spells beauty in any language"
NI
Offline
nitro2
Bronze
Posted August 23, 2025 at 21:11 GMT
Edited August 24, 2025 at 08:29 GMT
#1670841
Yes , that plug is present .

Strange thing it stopped suddenly without a plop , only silence on all 4 outputs .

i noticed there is no "pop"sound when i switch on the master , so it looks the whole amplifier section is not working .

Mute relay is working .

 

Is there a fuse  for the power-amp section ?

 

 
DI
Offline
Dillen
BronzeModeratorFounder
Posted August 30, 2025 at 07:31 GMT
#1670903
Is the 8V present for the tonecontrol circuits?
If not, check 3TR4 (BC547B) and all filter capacitors related to the supply voltages in the preamplifier.

Martin
NI
Offline
nitro2
Bronze
Posted September 1, 2025 at 19:18 GMT
#1670952
looks like the relay rl1 is acting a bit strange ,

only has an active break-contact , i don't know if that is supposed to be that way as the schematic indicates it should be closed active via tr19 .

am i missing something here ??
NI
Offline
nitro2
Bronze
Posted September 7, 2025 at 08:33 GMT
#1671024
As adviced bij Dillen ,

replacing the relay after 30 years is a good idea as the contacts have detoriated a lot !

this is clearly visible in the metal "coating" on the inside of the plastic housing .

= the real problem however turned out to be TR19 , after replacing the bc337 the relay responded to the standby signal again ( as is was shorted to mass , the relay was active all the time ) .

 

Thanks Martin for assisting !!
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