Thanks SithMaster !!
Well, I think most people traded in the Guilders for Euro's. Lots of people have probably kept a couple just for "old time's sake" or something.
All the guilders I've got now I found on the bottoms of the Galaxian and especialy the Centipede. I'll definitly need more though
Did some more work tonight:
"If it ain't broke, don't fix it" is something I often use in my work in electronics.
However, this is not always true of course. So I carefully removed the PCB from the cab. It had been running some time and the connector felt a bit warm (not at all hot) at the position of where the power is connected. So I cleaned the card-edge contacts with the glass-fibre pen. I don't know how to clean the contacts of the connector itself. I'm not a big fan of contact sprays and usualy only use them as a last solution, because they tend to draw more dirt to them and make the problem worse over some time....
So I connected, re-connected, connected and repeated this a couple of times. This is usualy OK enought te remove any bad contact stuff.....
However, when I looked at the PCB when it was out, it turned out the two diodes that are making DC out of the AC, are running pretty hot. You can see it on the PCB and the solderings were quite black. These diodes are right under the part of the connector that was "warm". So maybe, this is simply caused by the diodes and not any poor contact on the connector itself.
I carefully cleaned off all the dirt (surprisingly little !) off the PCB. I'm not the type to throw a perfectly working PCB in a dishwasher, sorry guys.
Inspected the board, it looks like there has never been ANY repair on this one.....amazing !
Anyway, I needed to do some more things while I had that PCB out.
(For US readers, boring SCART info ahead)
To run a TV as a monitor in RGB mode, you need to "feed" two voltages to two pins on the SCART connector. You need to put a voltage between 9,5 and 12V on pin 16 to tell it that it must switch to AV mode (=select the video input). Also you need to put a voltage between 1 and 3 V on pin 8 to tell the TV it should select RGB as input.
Now neither of these voltages are available directly on the Galaxian PCB. I solved this by soldering a wire to a known +5V point and leading it to pin 8 via a set of disconnects (in case I ever need to remove the PCB again). Some people connect 5V directly to it, but I used a series resistor to lower the voltage and be safe.
Next I needed something between 9,5 and 12V. I found a 7810 in my stack of electronics parts. This is a general voltage regulator. You can put in something like 20V and this thing puts out a very steady 10 Volt (a 7812 gives 12 V, 7805 5V etc.) So this should work. All I needed was a DC voltage that was high enough to run the 7810. I checked out the schematics and found there would be about 16V DC over elco C38. I checked it with my DVM and it was there indeed. So I wired up the ground pin to the - side of the elco, the input pin directly to the + pin of the elco, and lead the output to another connector. This is connected to pin 16.
I checked everything and put the PCB in the cab. First I fired up and measured without the monitor connected. Voltages OK !
Connected the wires to the SCART connector, fired up again and BINGO ! The TV instantly displays the RGB signal without any manual things to do on the remote. The best thing is that the irritating green channel number (0) is now also gone !!!
So now it is just running as a monitor like it should.
Here's some schematic on the SCART:
I will add some pics later....