Not a very nice Sunday, weather wise. So in the morning I worked on Debbie and in the afternoon I decided to spend some time on my latest test kit, Bernd and I bought a few weeks ago.
As you recall I had opened it up already, noticed everything was very very dirty inside and had a quick test. So I opened it up again, this time I cleaned the inside with compressed air. Gently, don’t want to bend anything, but at least I could start to identify the various components.
One of the first things I noticed was that the big connector on the rear of the tester had come loose. Which also meant on the inside it pushing the PCB on which it and other components were soldered out of whack. Putting stress on various soldering connections.
So I drilled out the old, broke rivet and tried to to put a new one in. Turned out that was not even possible, so I had to come up with a little extension on my rivet tool.
In the end I managed to secure the connector properly to the casing again.
Next I carefully studied each PCB. Just take a very close look at every component, feel very carefully if anything is loose. Check the relay contacts move, take out the fuses, check the fuses, clean the fuses. etc etc.
I found two component that had broken loose. A bit difficult to see, my index finger is resting on a connector.
I have remove the other side, holding a wire. I can actually wiggle this little item about 1mm back and forth. When looking at the other side of the PCB it could be clearly seen that it had worked itself loose from the soldering
Quick fix with the normal electric soldering gun.
I also found one of the glass fuses blown. It was very difficult to make out what rating it was. It was a bit corroded, so I cleaned, very lightly polished it. I could make out T63Ma. The lettering was all wonky, not nicely aligned. The 6 was larger than the 3, the M capital and the a not. Still, I think this is just a Time lag (T) 63 milli Amp fuse. It had a tiny, tiny wire inside. Of course, I do stock a huge variety of these fuses, but alas not a T63. I did have a T100mA, but better not risk it. I have already ordered a box and they should arrive tomorrow.
One of the relay was stuck and I had to take it out, clean it and now working fine again. I used pneumatic air and contact cleaner on all the control switched and buttons on the front.
Had to take the various control knobs off, undo some nuts and everything came off.
I had noticed that the stroboscopic lamp would not switch on properly. I sort of had to hold the switch in between two positions. Which might mean it is worn or just very dirty. Well at least the latter was true. So I gave it a very thorough cleaning.
The one thing that caught me out, the knob does not have a fixed position on the switch shaft. So it was a bit of a puzzle to get it set up properly.
Would not think working on some electrical components brings out these many tools, but it did
I took every PCB out, inspected it, felt every component. Really, I should have taken antistatic precaution, but this type of old electronic equipment is very robust, much more so than modern electronics. There you really need to take proper caution against any static discharge.
I put both these tester next to each other to verify the working and position of the switches. They are essentially the same machines, able to perform identical measure, only the internal bits are different.
Waiting for my 63 mA, slow fuse and hopefully I can test it soon.
Next Saturday, Toon is coming again and we are going for the second attempt on his window on his W123. If anything we know how to take it apart!
Jeroen