Beomaster 2400 volume jumps to full blast

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Larry Posted: Thu, Mar 19 2015 7:21 PM

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While I'm at it, the other problem with this particular Beomaster 2400 is that the volume control sticks, and then when I  finally get it to respond it jumps to full volume (either w remote or by the touch control.  (My housemates love me when this happens at odd hours)!

I assume the underlying switch is failing or maybe just needs a good shot of deoxit which brings me to my other question of how the heck do you open one of these?    I'm hoping to solve this without a major overhaul if that's possible.

Thank you,

Larry

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Dillen replied on Thu, Mar 19 2015 8:39 PM

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There are no switches.
The volume is regulated by sensitouch pads, connected to high-impedance transistor circuits,
gating the signal from an oscillator into an integrated decimal counter for counting up/down respectively.
The output from the counter is then converted to an analogue signal used to set the level of
illumination of an incasdescent lamp sitting in a closed plastic housing surrounded by four LDRs, two
for each channel.
One LDR sets the volume by grounding more or less of the passing signal, the other controls
the amount of loudness.

Sorry, but deoxit will not help here.
Look for wrong lamps, power supply ripple, ambient noise in that order.

Martin

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Larry replied on Thu, Mar 19 2015 9:41 PM

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Hi Martin,

As usual, thank you for your comprehensive reply, learning,  and  probable  causes for this condition.

I love the 2400's and have had several now, with varying states of electronic and/or cosmetic issues.  It's probably time to bit the bullet and have one of them completey  overhauled by a qualified engineer (which I am not)!

In the meantime, I'll have to pick a volume (using the slide switch) and leave it alone, especially if it's in the middle of the night!

Best regards,

Larry