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Beomaster 5000 Issue

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dahiyas
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dahiyas posted on Sun, Jun 13 2021 8:18 AM

Hello again..I recently added a Beomaster 5000 to my collection. (The unit was advertised as "for parts" and completely dead - no standby light).

Replacing the capacitors on the processor pcb fixed the standby issue. I replaced the trimmers also and made the adjustments as per service manual guidelines.

Current issues -

1. There is no output on speaker 1. Speaker 2 sockets work(kind of..issue 2)

2. There is a lot of distortion (on both speakers) when music is played. 

Issue 1 - I have already replaced the muting relay. I can see the relay click when power is applied (speaker disconnect). But after that there is no way to get the relay to engage again for speaker 1 to work. Pressing Mute on the main panel or remotes does not do anything. Muting/Unmuting shows the correct status on MCP display. 

Any suggestions ?

Thank you !!

 

 

 

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Dillen
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Dillen replied on Sun, Jun 13 2021 9:10 AM

Make sure nothing is connected to the headphones socket and check that the contact inside the socket hasn't shorted permanently.
Also check the relay driver transistor.

Martin

dahiyas
Top 500 Contributor
United States
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Thanks Martin.

Yes, I have nothing connected on the headphone socket, Also, I tried disconnecting the P9 connector and no change. 

The transistors checkout ok.

The voltage between R44 and R42 measures at 20V (instead of 15V).

I do not see any voltage changing to 0V when mute is pressed. The MCP shows the mute status correctly whenever mute is pressed.

Thanks

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