25 May 2016, 13:27 | #1 |
Retro Nuts
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Amiga CD32 drive unit adjustment & circuit analysis
**Amiga CD32 drive unit adjustment & circuit analysis**
(Can someone change the title of the thread please and make it a sticky.) This is 4 hour long video,about the Amiga CD32 CD drive and how to adjust it to read copies,how it works too... You adjust the 4 pots on the side of the cd unit.This goes into more detail about the CD drive and how to adjust it. This needs a post of it own,and needs to be made a sticky,if someone could please,thanks.(Wish you had a youtube button to add videos to the post) [ Show youtube player ] Video by RetroGameModz The purpose of this video is primarily to give other people an idea of how I adjusted this Amiga CD32 drive unit to have it read CD-R discs really well, which it wouldn't do before the adjustment. However, a good understanding of how the drive unit works is essential in order to be able to make the adjustment correctly. Therefore, this is a very in-depth video that covers not only the adjustment procedure itself, but also all the theory that goes behind it. The following is included in the video: - Disassembly of the Amiga CD32 drive unit - Teardown & identification of parts - Explanation of the signal paths - Reverse engineering - Schematics & block diagrams - Servo system theory of operation - In-depth circuit analysis & explanation - Practical demonstrations showing different signals on a scope - Adjustment setup & preparation - The adjustment procedure, covering FEG, TEG, FEB, TEB and laser power adjustment - Presenting lots of scanned-in documents and notes A lot of the information presented in this video can be applied to any kind of CD player and CD-ROM unit, since the topology behind them is usually the same, only with some minor differences between brands and models. It's also very likely that most of the information being presented here can be applied to different types of DVD-based systems as well. Here is an index of the video content for your convenience: 00:00:00 - Introduction 00:05:15 - Disassembly of the CD32 drive unit 00:09:07 - First look at the main controller board 00:10:14 - Teardown starts 00:10:52 - Talking about the pickup unit 00:19:26 - Talking about the laser power potentiometer 00:22:00 - The basic topology of the focus control 00:28:15 - PS2 pickup actuator teardown and demonstration 00:49:49 - F.... E.... G.... ? 00:50:48 - Theory of operation; circuit signal paths 01:01:14 - Schematics, block diagram & general circuit analysis 01:24:29 - More in-depth circuit analysis 01:58:06 - Test your analytical skills 01:59:59 - Some more documentation 02:03:03 - Test your analytical skills: Presenting the answer 02:05:26 - Adjustment preparation 02:18:55 - Talking about the adjustment procedure 02:35:29 - Looking at the signals on a scope; practical demonstrations 02:44:14 - FEG adjustment demonstration 03:07:14 - Constant Linear Velocity 03:08:31 - Looking at the signals with a CD-R in the drive / doing adjustments 03:24:10 - Listening to the whining sound of the actuator coils 03:27:03 - Adjusting FEB using the multimeter technique 03:36:47 - FEG adjustment* (NOTE: Incorrect scope settings! Watch from 02:44:14 instead!) 03:42:55 - TEG adjustment 03:45:54 - Talking about the laser diode power adjustment 03:52:29 - Laser diode power adjustment & practical demonstration 04:00:17 - Comparison between an original and CD-R disc & final thoughts 04:06:33 - Pictures of scanned-in notes and other documentation *NOTE: I am doing an adjustment of FEG starting from 03:37:53 in the video. However, at this time in the video, I forgot to set the scope back to the right timebase, and I'm also using a CD-R for this adjustment although using an original audio disc is better. So this part should really not be included in the video since it's not a good adjustment technique. However, I realized this after already having uploaded the video to YouTube, and there is no way I'm going to edit, render and then upload the whole video again. A correct way of adjusting FEG is still included in the video, which can be found starting from 02:44:14. So as for the FEG adjustment, please disregard from what is shown in the video between 03:36:47 and 03:42:55. After shooting this video, I double-checked the adjustment using other scope settings. Datasheets: Sony CXA1372Q http://pdf.datasheetarchive.com/datas... Sony CXD2500BQ http://pdf.datasheetarchive.com/datas... Sanyo LA6530 http://pdf.datasheetcatalog.com/datas... Sanyo LA6520 http://pdf.datasheetcatalog.com/datas... Fujitsu MB3771 http://pdf.datasheetcatalog.com/datas... Feel free to ask questions and leave any possible corrections in the comments section below. Some "fun" facts: After editing, it took over 44 hours for my computer to render this whole video in 1080p. Yes, I timed it. Also, during the first two rendering attempts, my buggy video editor froze halfway through which forced me to initiate rendering several times over. So, I expect the total rendering time for this video to be close to 100 hours. Crazy, isn't it? Luckily enough, I at least had the chance to use my friend's 100 Mbit internet connection to upload the video to YouTube. The whole 18.3 GB file was uploaded in an incredible 40 minutes! It would probably have been a nightmare to upload it at 3 Mbit/s (in reality 2.2 Mbit/s) using my own ISP. I think I will try to keep my videos a bit shorter in the future... More info will be added here.. Superduper wrote about the trimmer pot by the laser: As FOL as already said It might be that the laser is weak , I have had similar probs to this , what I did is alter the trimmer pot by the laser , I moved it about 5mins if you think of it as a clock in a clockwise direction, do not move it too much you will shorten the life of the laser. The CD32 now will play almost anything So to summarise moving the trimmer clockwise increases the laser strength so be careful.I will not personally move it more than 15mins as you will defo kill the laser is a short space of time. Last edited by spannernick; 26 May 2016 at 15:06. |
25 May 2016, 15:44 | #2 |
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Very nice
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25 May 2016, 22:16 | #4 |
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Thx for this, great work!
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26 May 2016, 14:11 | #5 |
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Hi,
I appreciate your effort, but I'm hesitating on sticking this .. Basically all of the information is in an off-site video, which may or may not stay online due to whatever circumstances. Ah well, I'll do it. Please manage your original post if the url to the video ever changes. |
26 May 2016, 14:26 | #6 | |
Retro Nuts
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Quote:
Of Course if the video changes I will update the url,and if I can get anymore info I will add it.I have a copy of the video just incase.. And thanks to prowler too.. Last edited by spannernick; 26 May 2016 at 15:09. |
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26 March 2018, 11:44 | #7 |
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Beautiful video. Excellent explanations.
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28 November 2019, 14:39 | #8 |
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Just a hint: in the past I replaced like three CD32 drives which were working fine very shortly (problems at 2x speed and with CD-Rs). Ultimately when I replaced CD32's external PSU all of them began to work flawlessly...
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12 July 2023, 15:44 | #9 |
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Hi, why is the YouTube video not available anymore?
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12 July 2023, 16:12 | #10 |
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clearly what jope feared has happened did someone save and archive this video?
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12 July 2023, 19:05 | #11 |
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Join Date: Jul 2003
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Thread unstuck. It gives me zero satisfaction to have predicted this.
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17 July 2023, 11:02 | #12 |
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I remember downloading this video from YouToube with 4K Video Downloader a few years ago, but I can't find the file in my backups. I'll keep searching...
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17 July 2023, 11:14 | #13 |
Targ Explorer
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@spannernick logged in here two days ago. Did anyone PM him?
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17 July 2023, 14:22 | #14 |
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I tried to message hime, but:
"spannernick has chosen not to receive private messages or may not be allowed to receive private messages. Therefore you may not send your message to him/her." |
21 July 2023, 13:36 | #15 |
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Apparently I made a mistake and do not have a copy of the above video. So I hope someone else has downloaded it.
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23 July 2023, 11:35 | #16 |
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By the way, the URL's to the datasheets are not working either. I found some alternatives:
Sony CXA1372Q https://datasheetspdf.com/pdf-file/8...ion/CXA1372Q/1 Sony CXD2500BQ https://datasheetspdf.com/pdf-file/1...on/CXD2500BQ/1 Sanyo LA6530 https://datasheetspdf.com/pdf-file/3...Sanyo/LA6530/1 Sanyo LA6520 https://datasheetspdf.com/pdf-file/3...Sanyo/LA6520/1 Fujitsu MB3771 https://datasheetspdf.com/pdf-file/5...jitsu/MB3771/1 I figured out myself that the mysterious microcontroller on the PCB (MN187164MCC1) was made by Matsushita-Kotobuki Electronics Industries, but could not find a datasheet. I've e-mail spannernick a few days ago, but received no response Last edited by CD32Freak; 27 July 2023 at 18:45. |
27 July 2023, 18:58 | #17 |
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...
Last edited by CD32Freak; 28 October 2023 at 15:13. |
06 August 2023, 13:01 | #18 |
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Is there anyone out there that has downloaded the video? It is such an important in-depth research video which should be preserved for future generations.
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09 August 2023, 08:11 | #19 |
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@spannernick
Why don't you respond to my simple request to put the video back online? |
11 August 2023, 09:49 | #20 | |
PSPUAE DEV
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Quote:
None of this is needed. They are setup at factory for reason. Meaning any issues with laser, you just drop a new one in and sorted. Altering these crucial adjustments will cause issues, if your altering them to work with a low eimission laser diode. So when you drop in a new laser, you will find it could have issues reading. If people really want to read cdr's, just drop a KSS-212A in there and they generally read all cdr's with out messing with crucial pots. Also, it doesnt matter about writing speed. Complete myth, I have always written at full speed and never had one issue. I recall Toni Willen also saying the same, "its a myth". |
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