Good job !

😉

Martin

I just bought a 1900-2 and found the balance control to be broken as well.

How do I open the unit and gain  access to the slider PC connectors?

Welcome to Beoworld !

You have an answer to your PM regarding the lamp kit.
The kit comes with detailed (dis-)assembly instructions which will also help you gain access to the tonecontrol board.

Martin

After reading this thread I just fixed the bass potentiomoter on my 1900 and thought I would post a few photos and notes in case it helps anyone else about to do the same.

Firstly I wasn't sure how I was going to solder out the potentiometer because the circuitboard it is attached to has a bunch of wires conneted to it which don't have much slack, making it hard to work on. Then I noticed a groove in the plastic below where the board sits so that once you unscrew it, you can stand it on its edge to access both sides without disconnecting any of the attached wires - makes it much easier.

Once you have the pot out of the board, you have to take it appart by bending straight the 4 metal hooks on the underside which hold the metal slide rail in place at each end. I just loosened these and I was able to slide out the metal rail, which gives you access to the loose contacts pictured below:

The tiny bits of plastic holding the brass contacts had both broken, so I removed them.

These are the brass contacts removed. I used tweezers.

After I had cleaned the lubricant off the black plastic where the brass contacts mount using contact cleaner on a cotton bud, I superglued them back in place as per Dillen's instructions.

24 hours later I put it all back together and the bass adjustment is working again. Many thanks to Dillen for the instructions.