[didier]

Bonjour de Montréal, chartz!

This is the insides of the motor… you can see the cracked plastic I removed at the top, they were originally on the side of the magnetic ring. I didn’t have to disassemble further

Now I don’t see how I could have reversed the magnet polarities since the shaft can only go back one side (so that the brushes can touch the commutator.)

Similarly the brush plate can only be reassembled back one way since the square hole accommodates the chip on the board…

Or maybe I misunderstood something

[didier]

Okayyy… I removed the broken plastic piece and it now runs smooth and quietly!

But… It runs backward ?

I disassembled again and looking at the way th parts fit into each other, I don’t see how I could have reversed the polarity by mistake.

[didier]

I appreciate the answer Mark, I am waiting for a new solder station and will update

[didier]

Thank you for sharing!

I got to the PCB in the motor… I’m guessing I can’t go deeper without unsoldering as you said. Do I need to do all the solder points?

 

[didier]

For future reference, the motor in question is a Matsushita mmx-4h2rpb, it seems to have been fitted on:

• Beogram 1800
• Beogram 2000
• Beogram 5000 and 5005
• Beogram 7000
• Beogram RX2
• Probably a few others…

[didier]

I did a temporary fix to get proper clearance for the belt:

https://youtu.be/j-3bKzEZ8TA

Right now the belt is not touching anything but the noise is still there…

[didier]

You were completely right about the rubber suspensions, on eof them was completely squished, while the others were dried up.

Although, even at no load the bad noise continues, here is a video:

https://www.youtube.com/watch?v=QYMYdzi4Bj8

It is my first Beogram, but I think this is not normal…

[didier]

I’m refurbishing a pair of Beovox RL 60.2 – one of them had 3 pieces of moulding inside that were broken. They usually hold the screw, so trying to unscrew them would just turn the screw as if the thread was stripped… Fun! Fixed with polyurethane which was what I had available then and I recovered with a new fabric. I have the second one to do now…

I also have a Beomaster 8000 next, but with a hot right heatsink so I’m not in a hurry to get at it. Although I did crack it open to see its state and it doesn’t seem too bad overall.

Then a beogram 2000 low on my priorities, since I’ll need to purchase a cartridge to test further…

[didier]

Hi Alf,

I’m looking for the wood veneer in rosewood,

The left spring (under the release rail),

and the lid damper mechanism,

I sent you a pm 🙂

[didier]

Thanks Martin,

I will investigate this – and won’t miss to add these in my next order!

 

[Author]

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