SOLVED !! Beomaster 7000 has suddenly become very silent

[nitro2]

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

• This topic was modified 4 weeks ago by nitro2.
• This topic was modified 3 weeks, 6 days ago by nitro2.
• This topic was modified 1 week, 6 days ago by nitro2.

[CharlieWednesday]

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:

[nitro2]

no output at all .

so pcb 7 is not the cause ( i think )

both right and left is missing on every output

 

 

 

 

• This reply was modified 4 weeks ago by nitro2.
• This reply was modified 4 weeks ago by nitro2.
• This reply was modified 3 weeks, 6 days ago by nitro2.

[lausvi]

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:

[nitro2]

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 ?

 

 

• This reply was modified 3 weeks, 6 days ago by nitro2.

[Dillen]

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

[nitro2]

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 ??

[nitro2]

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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