Philips VG-8020 keyboard repair

Keys not working is a common problem with old MSX computers. Most times a good cleaning is all what's necessary to get them working again.

So how do you do that?

First make sure your MSX is disconnected from the mains.

Bottom of the
        MSX

First you have to open the MSX. Flip the MSX over so you see the bottom. Then remove the two screws. Flip the MSX over in it's normal position. Next gently slide the top towards you and up. The top comes off that way.

MSX open

Remove the screw for the ground cables.

Ground cables
        screw

Gently disconnect the connector for the keyboard ground cable.

Keyboard
        ground cable connector

Flip the keyboard towards you on it's back. Then remove all screws.

Keyboard back
        plate

Once the screws are removed you can flip the keyboard back. Gently so the keys part seperates from the membrame part. Clean the membrames plastic surface with ethanol. Also between the sheets. You can seperate them. In my case they where fixed together with tape. Make sure when putting them back they align.

Membrame
        visible

The plastic base plate with the keys attached is free now. First remove all springs, be carefull, so you don't loose them. Then remove all metal parts. Under each key there is second spring. So you have at least 2 springs per key. Finally you can gently remove the keys with a small screwdriver.

Dirty
        keyboard

There was a lot of dirt under my MSX keyboard.

Cursor keys
        square

In the middle of the cursor key there is a small square fixed with a screw. Remove that as well.

Cups with the
        parts removed

Keep all parts together.

Cleaning the
        keys

Give the keys and plastic base platea good cleansing. I used a sodium percarbonate solution to clean the keys and Dreft for the base plate.

Reasemble the
        keys

Reassemble the keyboard.

Reasembled
        and clean keyboard

A nice and clean keyboard!

Put the back
        springs in

Turn the keyboard and put the smaller springs back.

MSX
        reasembled again

Reassembled, connect your MSX and test if all keys are working again.