Amiga 4000 Restoration Video - 3 years in the making! (Part 1) 

Thanks, perhaps I should ask the maker of my Socks to sponsor my Channel 😋

Thanks Luke, as always.

Thanks. It should be ready soon.

Indeed. I will be trying this card with the Zulu SCSI card I ordered from AmigaKit, just to see how the speed compares to the A4000's On-board IDE.

What’s better, 4091 (as DKB made them!) or the Rapid Fire Scsi 2 Controller?

@mervynstent1578 Though I never owned either, I have read that the Fastlane SCSI card is the fastest Zoro III option for the A3000/4000. Both the Commodore 4091 and Fastlane have DMA (Direct Memory Access) capability, which lessens CPU demand, unlike the DKB Rapid Fire that came with my Amiga 4000.

I did win the lottery on this one. Even though I tried my best to go by the provided images during the ebay sale, you never know until it's in your hands. The Audio Circuit damage was caused by the SMD Capacitors and possible water intrusion from the rear of the case. In this case, I doubt if getting to that sooner would have made much of a difference.

@@amigaretro4765 2 of the SMD capacitors in the audio circuit are actually labelled backwards and were factory installed backwards. C443 and C433. Lots of evidence proving this. On the CPU board, there are more capacitors labelled and installed backwards than correctly. C106, C105 and C107 are labelled backwards on the A3640 CPU boards. Recapping the CPU boards is even more critical than the mainboard. When the caps rupture, the electrolyte gets in the via's and corrodes there, breaking connections between the layers the multi-layer board. I have a couple of these A3640s that have died, with no external errors and nearly all components replaced. Even Chucky Hertell identified this as a very common problem, which was part of the reason he reengineered the A3640 board... Lots of evidence to prove this... The audio caps being reversed isn't as serious, but it does strain those caps, meaning they'll fail faster...

@rdh2059 Great Info. I'll check the caps once I get home. Makes you wonder how stuff like this makes it through the Engineering process.

@@amigaretro4765 Remember these SMD based Amiga's were near the end of Commodore, who was already under investigation of groundwater contamination. Their circuitboard manufacturing site ended up being a huge superfund site, which is a big part of the reason Commodore went bankrupt... The cost of that cleanup was hundreds of millions... All the cleaning solvents and etching chemicals started leaking, which ended up in the groundwater...

Interesting. This may explain many things :)

I gently twist the SMD caps off with a pair of pilers (unless the pads are extremely corroded) , then remove the remaining legs with the soldering iron. After that I clean the pads with flux and a de-soldering wick. It works well. Hot air generally takes longer and I am always worried the cap may explode during the process 😆

@@amigaretro4765 ooof no twists, do not be like Adrian!

@@ChrisEdwardsRestoration Adrian Black does this as well? I don't feel so bad 😀Actually, I got this trick from Mr. Carlson's Lab.. I assume cutting them with Pliers near the base of the Capacitor is your method of choice?

@@amigaretro4765 snips. Ive showed It and get heat from The crew all the time

I have not. It might be worth looking into.

Never heard if it. I do have a Zulu SCSI Card, just need a better SCSI card that can recognize greater than 2 GB partitions.

That did cross my mind 😁

Varta 💀