Amiga 1200 Restore and Repair
Ғылым және технология
I was very generously given an Amiga 1200 by the past chairman of ICPUG (Independent Commodore Products User Group). // Kindly sponsored by PCBWay - high quality PCBs for just $5 www.pcbway.com
In this video I do some basic restoration and recapping. But then: what is that weird problem with the mouse? Let's find out...
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Music: Arpanauts by Eric Skiff - ericskiff.com/music
00:00 - Introduction
00:50 - Unboxing
05:01 - Sponsor Message
12:11 - Test 1: Basic power up/. Does it work?
13:40 - Test 2: Hard Drive
17:20 - Re-Cap Preparation
23:27 - SMD Cap Removal
27:05 - Tracking Down the Trace
28:41 - Replacing the capacitor with the broken pad
31:34 - Attaching the ‘normal’ SMD caps
32:02 - Fitting the thru hole caps
33:10 - Refit the Keyboard Connector
34:06 - Testing the recapped board
37:18 - Scope It!
41:57 - Removing the Mouse Filter Capacitor
43:21 - Retest
Пікірлер: 12
Thanks for sharing this.
12:40 - It's ALIVE!!
Nice video Tim, You have a beautiful machine there :) and nice fix too :)
19:30 - I took the keyboard connector out when I recapped it
@TimsRetroCorner
Жыл бұрын
Yay!
Hi mate. nice video. I have some trouble with my 1200, after years dont start, i made a recap but no luck. I´ve got black screen with some times red screen with horizontal interference lines. No floppy activity and fix power led. I test with other known working roms and the same. I can reset amiga with keyboard with a 1 standard flash in shift key led. All 5v reset /halt tested and are ok. U49 POWER OK is good too. I suspect if i have random red screen all custom chips are ok? And maybe a bad contact or cutted trace from rom shocket???? Uffff, im a bit lost... I need a clue. Thanks in advance...
@TimsRetroCorner
Жыл бұрын
Red screen could be a kickstart rom issue. Do you have a DiagRom you can test with? That's a 2 rom set for the A1200. It'll run tests and send results to the screen and serial port. Also check the rom sockets & clean them if necessary. If you have a scope it's worth checking the clock, address and data lines.
27:05 - I was wondering what that bodge was on the Video DAC. My Amiga doesn't have that. I checked PCB explorer and was confused as it shows that trace on that pin on the DAC just going to a via that then doesn't go anywhere. Turns out that is why the bodge is there, because they forgot to install the trace on the motherboard.
@TimsRetroCorner
Жыл бұрын
Yep, I think rev 1A is one of the early ones...
Possibly the worst way of removing surface mount electrolytic caps imaginable. So if it doesn't damage the board how come a pad is missing? Do NOT do it this way. Just heat one leg and rock the cap sideways a little then go back and heat the other one and no danger of ripping a pad of the board.
@TimsRetroCorner
Жыл бұрын
Not at all. The pad was lost to the soldering iron during cleanup, as can be seen in the video, not from removing the cap. It was most likely already damaged by leaking cap juice.
@josephphillips9243
Жыл бұрын
I don't understand. You are talking about the removal at around 23:30? Add fresh solder then heat up that solder and the legs will move with the hot solder and without any resistance as shown........ what am I missing?