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Beomaster 5500 with issues

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Woody
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Adelaide Australia
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Woody posted on Thu, Jul 30 2020 2:50 PM

Hi, new to the site here and looking for a bit of guidance from the more tech savvy and experienced here. 

I bought a 5500 series last year with amp/tuner, cd player, tape deck, linear turntable etc and put it in storage until I had time to get it properly set up. Big mistake! Had I known that it was faulty I could have claimed a refund but it's now too late. 

The cd, phono, and tape deck seem to be working fine but initially I had to get the speakers repaired due to the outer support rings being disintegrate. I understand that this is a common issue and it wasn't an expensive repair. 

Once I received the speakers back and set everything up, it was obvious that the Beomaster unit was not behaving correctly. The audio signals from all external devices were not being amplified to the speakers. After some fault finding, I discovered that the 40, - 40, 13, 12, -12, 8 and 5 Volt rails were all missing. This lead me to the standby/power on relay which was toast. Found a replacement and installed it but I noticed that the 8V rail is now a 10.5 V rail. All other DC voltages appear to be very close to the specs. The relay is switching on and off correctly but the 6V coil has 8V across it due to the high 8V rail voltage when in standby mode. 

The amplifier works fine for a short time of perhaps 30 seconds and then shuts down. I noticed that two of the smaller transistors bolted to the rear heatsink are getting up to +40 Deg C before the shutdown occurs. 

 

Has anyone else here experienced similar problems? 

Any advice will be greatly appreciated. 

Time was on my side! 

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