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The Beomaster 6000, the sequel

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Peter
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Saint Paul, Minnesota
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Peter Posted: Tue, Feb 28 2017 8:45 PM
After a year of on/off working and hunting for parts on my Beomaster 6000 it's perfect and I use it everyday and I love it like I would love a pet cat (if I had a cat but I don't). So.... I'm going to work on another forlorn BM6000 but this time I'll post more as I go.

Peter-

Peter
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Saint Paul, Minnesota
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Peter replied on Tue, Feb 28 2017 8:50 PM
This is my happy working example. I need a better way to display it. Later.

This is the sad Beomaster

He said, "it doesn't work" when I picked it up. Dim bulb test...fail...opened it up.

Peter-

Peter
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Peter replied on Tue, Feb 28 2017 8:58 PM
Blown 400ma fuse.

Pulled out pcb16, power supply. Flipped over found a jumper

Burn on jumper from shorting on C11

Peter-

Peter
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Saint Paul, Minnesota
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Peter replied on Tue, Feb 28 2017 9:02 PM
3300uf capacitor tested no good, replaced.

Bridging Rectifier tested and also no good (learned to check that from the Beomaster 4000, thanks guys).

Started looking for a replacement.

Peter-

Peter
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Peter replied on Tue, Feb 28 2017 9:07 PM
Recapped PCB 9 and replaced trim pots while I waited to find a source for the bridging rectifier.

I had my good Beomaster 6000 open to adjust volume control speed so I dropped the output board from the sad Beomaster 6000 into the good BM6000, worked great, adjusted bias and offset.

Peter-

Peter
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Saint Paul, Minnesota
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Peter replied on Wed, Mar 1 2017 1:46 AM
I scavenged a good rectifier out of a Beomaster 5000, seems this rectifier are more commonly for sale in the EU and England than around here. Tr2 BD536 in the power supply that had the shorted jumper tested good.

It appears the PCB has the leads mislabeled?

The transistor itself looks like BCE but the board looks like it should have been ECB. Cleaned, new thermal paste and back in.

Peter-

Peter
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Saint Paul, Minnesota
Posts 252
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Peter replied on Fri, Mar 3 2017 8:40 PM

Dim bulb tester power up. OK.

Speakers connected and signal testing ipod to TP2. I have the volume motor disconnected, so manually adjusted the volume slider to 0.
Very very loud output volume. No light from volume control. Powered down, tweaked cables to PCB 2, the control board. Powered up, volume light now on, adjusted to just above 0. Still loud and distorted. Turned volume very low on ipod, distorted sounding still. Switched to FM, very very very loud, dimbulb started getting bright. Switched off. TP 2 again, playing as it was before requiring low volume from iPod. Adjusted bass and treble, working appropriate. Adjusted balance and very loud, dim bulb tester- bright dim bright dim. Poor little test speakers.

 

Peter-

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