Older Amiga A2000 Power supply repair

[roadrash]

My previous thread was for the later Amiga 2000 model sometimes called a B2000 but this is a early version Amiga A2000 and has a completely different Power supply. This one is also dead and so far I have replaced all the Electro caps and one IC (UA79M05). I haven't been able to track down the other IC I was going to replace if faulty. It is is marked with two numbers: "UC9432" and "7812". I cannot find any reference to what this actually is but is recognised by my tester. See the attached pics of this and Power supply with caps replaced. Can someone tell me if this is testing as ok and can identify it for me so I can get one for a spare.

[stj]

Re: Older AmigA A2000 Power supply repair

7812 is a standard 12v 1a voltage regulator.

[roadrash]

Re: Older AmigA A2000 Power supply repair

7812 is a standard 12v 1a voltage regulator.

Thanks that makes sense.

[PeteS in CA]

Re: Older AmigA A2000 Power supply repair

And the marking is (Fairchild Semiconductor logo) "UC8432". "UC" probably refers to the fab line, and "8432" means it was made in the 32nd week of 1984.

[Pentium4]

Re: Older AmigA A2000 Power supply repair

For something so old, I would carefully check all of the solder joints first thing to look for cold or cracked joints

[roadrash]

Re: Older AmigA A2000 Power supply repair

Thanks everyone thats a 2nd success now 2 Amiga 2000's power supplies fixed.
This has had all new caps and it looks like it may have been the 7812 regulator cos I hooked it up to by bench PSU and input'd 22v and got 17v out and it got hot in a few seconds too so ordered a new one which came today. Put it in and bingo running sweet again.