Amiga CD32 Restoration Part 2: Replace and calibrate the laser. Rectifying Mistakes.
Ғылым және технология
Thanks to pcbway.com Great PCBs from $5. In part 2 of my CD32 restoration, I fit and calibrate a new laser assembly, replace the two bulging capacitors that I fitted backwards last time, and investigate the left audio channel producing no sound.
Instructions for calibrating the laser came from Mike's Vintage Tech, check out his video here: • Amiga CD32 laser adjus...
and from the TSB blog, check that out here: www.tsb.space/knowledge-base/...
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00:00 - Introduction
00:21 - Disassembling the Laser Assembly
04:27 - PCB WAY
05:00 - Fitting the new Laser Assembly
07:55 - Trying the new Laser
09:44 - Next Steps
10:21 - Remember those Caps?
12:37 - Another Problem - No Left Audio
14:47 - Removing the two Backwards Caps
18:19 - Getting it to Read a CD
20:18 - Calibrating the Laser
23:15 - Adjusting the TEB Pot
24:35 - Adjusting the FEB Pot
27:54 - Adjusting the laser Output - First Try
28:46 - OK, let’s have another go
30:04 - The ‘Eye Diagram’
30:59 - First Pot (again)
32:13 - Second Pot (again)
34:37 - Fourth Pot - Focus Error Gain
35:43 - Summing Up
Пікірлер: 11
Nice video, good catch on the backwards caps too.....
Great video Tim .. very informative 😉
Get ya self a andostar :) love a cd32 repair so they such a Underrated machine
That was really vfm Tim. I am kinda dizzy right now but in a good way 😅
Nice video. But I don't quite understand, how do you correct the disk spinning in the opposite direction? Thanks.
@TimsRetroCorner
6 ай бұрын
I think the spinning backwards is something it does when it can't read the disc - in dase the disc is encoded backwards, I guess. Once it can read the disc properly it doesn't spin backwards. At least that's my experience.
Thanks for the video! I am currently trying to calibrate my CD32 too. I did not quite get the point when you adjusted pot 3 and 4. What do I need to look for on the oscilloscope? A signal shape that is as balanced as possible, without undulations?
@TimsRetroCorner
2 ай бұрын
Yes, you're looking for the least amount of turbulence in the signal.
I’m just puzzled as to why you thought the 2 x Capacitors were installed backwards in the first place so decided to install them the wrong way round?
@TimsRetroCorner
Ай бұрын
Because it's a well documented fault, and brain was not engaged that some boards might be correct.
@AJComputerServicesUK
Ай бұрын
@@TimsRetroCorner Oh ok & fair enough, I’ve only just come back into the Amiga scene after owning an A1200 many years ago and finding an A600 that I’d left in my Brothers loft in the late 90’s albeit in a poor state of repair & missing the PSU & Floppy, I’ve replaced one of the Caps near NE555 as it turned on initially after buying a PSU and after a few minutes I got a BSOD and removing the Cap near NE555 brought the “Insert Disk Screen” back so I’ve since replaced that Cap, I’m not looking forward to replacing some of the other Caps though, I’ve also managed to mod a Samsung PC Floppy Drive to work with the A600 so it now loads Workbench 3.0 fine, Question for you, Should a standard PC Serial mouse work with an A600 or not as I don’t have an Amiga Mouse?