Leo's weblog

A600 recap [2]

I have soldered the ceramic caps to the motherboard and it works OK!
Even the blinking Caps Lock is gone. So I'm very happy and even very proud I managed to recap my first Amiga 600.
One more Amiga salvaged!

A600 recap [1]

I bought an Amiga 600 from our local internet market. It was sold as good working. But it did not. Well it booted but the Caps Lock key kept blinking. I don't know why that is, but I decided to first give recapping a go. I ordered a set of caramic capacitors from a1k.org. That's a German forum devoted to Amigas. They offer a ceramic capacitor delivery service for several kinds of Amigas. Ceramic capacitors do not leak. So it should be good for several decades.

I'm not yet that skilled in soldering, but after reading a lot of what others said that recapped their Amiga and looking at some YouTube movies I decided to try it myself. The removal of the old caps is done now and i'm very happy with the result.
First I took every cap head with a pair of pliers and kept turning them slowly in one direction. The little legs broke from the cap and the plastic base with the rest of the legs stayed in place. Wiggling the leftovers broke them from the pads and then I could remove the plastic base. After that I could desolder the legs from the pads and clean the board. Goal is to not rip the pad off the board during this process.

Below I have three pictures with the situation before and after removing the smd capacitors. I did not yet remove the through-hole capacitors as I do not have replacements yet and I want to be able to test the result as soon as I have replaced the smd ones.
As you can see in the first picture, the two caps here are sitting very near some plastic connectors. In order to avoid melting the plastic I had these parts covered with alu foil.

As soon as I have got the replacement caps I will show you the result.

A500 Plus Rework [2]

I have replaced the socket for Gary. When I try to boot the A500 Plus I immediately get a green screen, which means Bad RAM. But it can also mean that the RAM isn't accessible, because of for instance a bad Agnus or Gary. So I rechecked the traces coming from Gary. I couldn't find any fault. As I cannot think of any other cause I will leave the machine for the moment. I might buy an A500 Plus board I saw for sale.

Amiga 500 Plus rework [1]

So I had an A500 Plus lying around for quite some years. And I thought it would be nice if this machine would boot! It hadn't since I bought it. And indeed it didn't boot now either.

An A500 Plus has a battery which I removed immediately after I bought this computer. But the damage was already done. I now had the guts to inspect this further and I noticed that the pins of Gary (a controller chip) were badly corroded. After a good clean there was still no boot, no display, nothing. But when I pushed hard on Gary, there would be some display, mostly green, white or yellow. As some of you might know, this gives an indication of the problem. I decided to remove the socket of Gary although I'm not very skilled at (de)soldering. And it was not very easy. Using a desoldering pump and desoldering wick I managed to get it of, but it cost me hours. You see the result in the picture.

Then I tried to hunt for broken traces, which also is very time consuming. Using a magnifying glass and a schematic I only found one damaged trace. I ordered a new socket and we will see in the next part if I manage to get this chip and the computer working again. Or that I have to hunt for more faults on the motherboard.

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