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Thursday, February 22, 2018

Beomaster 6000 (2702) restoration: mounting the power supply into the main chassis

After my disaster with the electrostatic discharge that fried several transistors in the output stages (click here), it was now time to put everything back into the main chassis of the Beomaster 6000. I had not touched them yet since the dismantling, so it all looked kind of dirty !

And after cleaning

And yes, I like to keep the stickers & lettering on it to keep the look & feel of vintage...

The 4 rubber feet had there best time, so I replaced them with 4 spare better looking ones.

The transformer went in first after adding a new power cord to the on/off switch. Then the voltage selector was mounted with the 2 screws. The small metal frame with the bridge rectifier and the stabiliser transistor are fixed. The larger clear metal frame was put in place, the on/off switch mounted and the plastic safety cap plugged on top.

The plastic holder with the two main fuses was screwed on again, but the copper foil did not stick anymore to the chassis. Not sure what type of glue they used because it's supposed to be electrical conductive. So, I used some duck tape to keep it in place and connected.

As mentioned in one of my earlier posts, some of the later Beomaster 6000's have an extra fuse (4A slow) mounted in the 27V AC connection from the transformer to the power supply PCB as an extra protection.  

I decided to add one also in the same spot. I used a encapsulated one versus the "open" one as seen in the picture above.

I needed to modify the metal bridge, that holds the power capacitor, a bit and drill a hole in it.

The transformer, main bridge rectifier, voltage selector, main fuse holder, on/off switch, power caps and new fuse are now in place.

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