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Thanks for the video. My XP80 had the glue problem. It was only on the underside of the keys so no damage anywhere.

Please post your "Buy me a coffee" link, you gave me the confidence to take this on and I really appreciate it.

QT perfectly explained and top background: LEGO space set from 1979-1980. Lego sets from your childhood? Many thanks 😊

Hi. I would like to say a huge thank you for this series of videos about Pentax Electro Spotmatic. I bought myself such a camera for restoration, but the electronics worked in it. Recently, I accidentally put a 4LR44 battery with the wrong polarity and the exposure meter stopped functioning. I would really like to repair it, but I can't find an electronic repair circuit. Problem: The exposure meter only does not react to light. ISO switching, exposure correction, aperture data transmission systems change the values of the exposure meter, but only when the mode is turned off. If you turn on the exposure measurement mode, the camera will work out 1/1000 and not react to light. I will be very grateful for any help in solving this problem. Thank you in advance.

Great video, thank you for a very thorough job. I disassembled my JV-80 and it has this problem really bad! I read that lye can have a very high pH in high concentrations, will lye dissolve this glue? Also a few of my keys don't work, is it possible glue got into the switches? Should I remove the ct. board and clean all of those contacts? Do you have any advice on doing that? And what kind of epoxy did you use? Thanks again. Cheers from California

Just scored one of these in Thailand at a flea market for the equivalent of €3.20. Still need a battery, and lens though.

DITTO

I have a jv80 but it's dead but it's not red glue. I think it's been fixed. ❤

Because of this video revealing the hand built electronics vs the ES 2 circuitry....as a lifetime user of Pentax for over 50 years. HS photog at 14 yrs old... now 67 and still shooting my 1978 Pentax 6x7. I just bought 10 yes TEN MINT 5+++ electro spotmatics out of JAPAN. the rarity of a mint condition 100% operational 1970 camera is REMARKABLE. The Electros can be found international ebay etc for around $75 to $125 usd plus $30 shipping direct from Japan...

I have to do my JD-800 😒😒

Great, great, great job!!

The effort you've put into an obscure and somewhat forgotten camera is remarkable - mazel tov! Now I'm looking to buy one knowing that I have a very well researched video to refer to if it's broken. 😀

this happened to me, had to hand scrape it with a lino knife

Just started the same repair on my Roland EP 9. This video was very helpful. Thank you.

Thanks for this video - I had to apologise to my kid tonight - his Roland EP7-II started having sticky keys. I was insinuating he was less than careful with a bowl of something sugary, turned out it was a chemist who was less than careful. Opened it to find a blob of red stuff on the backplate, but fortunately the electronics are fine. Thanks for taking the time to document this, seems I’ve got a job for the weekend now.

@ 36:35 It sounds like an OBVIOUS STATEMENT. But the results of experiments done at CERN, for instance, are far from obvious. They are statistical interpretations of data and thus partly arbitrary. Whether these interpretations have anything to do with an observed reality isn't obvious at all. So, I think your statement is a philosophical statement.

Wonderful and scary… but I fear that mine is in dire need of this treatment 😢

I was simply looking for some information about old Pentax film camera. And now I got into this great video about theory and reality. Who is this gentleman??

By far, the best layman introduction to QM. Well done indeed!

Great video! I was wondering if you would be able to share a link to the slotted screw driver you used (the one that has a "5" on it @5:32)? I've been looking for one of these and haven't been able to find one!

Quantum mechanics is not known to be logically inconsistency, but quantum mechanics predicts some things which do not happen in nature. The cosmological constant problem would be an example. If it predicts something that is so far off, quantum mechanics does not describe reality and is merely an approximation (an approximation that gets one number very wrong). It's simply the best model we have got at the moment for everything except gravity. We need a new theory.

Dear Edwin, this is really amazing what you did an presented here. Not just the analysis, but designing and producing all the gadgets represents a huge amount of work. You can easily train someone and run a global repair shop for these cameras!

I got an Electro Spotmatic back in 2018 and despite being in awful condition (missing hotshoe, corrosion, etc.), the light meter surprisingly still worked! Until 2019 that is. Ever since I found myself using the camera less but as of today, this video helped me get it working again :) Excellent work and thank you very much for sharing and preserving knowledge about these old cameras :)

Hi Edwin, your explanation of the electronics' function is amazing. Without it I would not be able to understand the function fully. Thanks!

Hello. I have just purchased one of these I live in UK so had to get it imported. Luckily my copy works. My PCB looks the same as yours but my battery compartment is different. I have no spring inside camera the spring on my version is inside the removable screw on cover. The battery polarity is the same as yours.. I also have the ES which has spring inside the camera and opposite polarity. My electro spotmatic has a lower serial number than yours also. Thank you for all your amazing work. Mike.

I have watched this series twice. I am so impressed. Thank you.

awesome work of love and patience

years ago, during the japanese economic bubble, i went fro m Honolulu Hawaii to Yokohama, Japan to do photography there. Fatefully I found myself teaching English and collecting cameras. The next thing i noticed was i had started a hobby of buying selling and sometimes repairing cameras via camera shows and the internet. This video has surprised me in numerous ways.Yes, this tiny camera clearly is "FINE". And YOU have done a wonderful presentation.

Edwin, I love your manner in explaining abstruse concepts simply. But in this case you reified the model: probability is not a property of "nature" but merely a measure of uncertainty in the observer. When you make a move like asserting (in no *uncertain terms* I might add) that there are "no true statements beyond probabilities" you make three errors: (1) you contradict yourself, (2) you can no longer dispute contradictions in a non-question-begging way, and (3) you violate the first principles of thought.

Great: have you thought about doing a series on reverse engineering stuff? Your channel has interesting technical content, but lacks direction which is possibly why you haven't got many subscribers despite your talent. Also, 50% views/subscriber for your recent series is exceptionally high compared to 10% which is considered good.

I’m in, this has happened to me with devastating effects 😢

Diving in...here goes nothing

Thank you Edwin for sharing your knowledge, but above all for the clear way that is perfectly understood. I will appreciate the 2nd part of the video and also if you could make a video with that understandable explanation capacity that you have, on the mathematical representation of the quantum state of a qubit in the Bloch sphere. What is not clear to me is how the complex exponential initially has an exponent of a difference of angles Phi to finally remain only Phi.

Thanks so much for making this, now i know why one of my Jv-80’s keyboard key is jammed up so bad lol.. Looks like quite the undertaking to clean and replace all this awful red glue!

Great job , thank you for sharing.👍

For Dutch readers, I have used HG gootsteenontstopper to remove the red glue from the keys (let it stay in overnight) and glued the weights with Bison kit transparant contact glue.

Hello Edwin. I am incredibly impressed with your knowledge, skills and work method. This is a shock for me. And although I have some knowledge in the field of automation and electronics, I would not be able to develop such an interesting repair method. I am passionate about the Pentax brand and have been repairing old Spotmats for some time. Rather for my own collecting purposes. I came across your video series on YT czcams.com/video/lS4M9BsmCyU/video.html Encouraged by your success in repairing the Pentax Electro, I decided to try repairing my ESII. You have written and said in videos that you are willing to help anyone who would like to try this experiment That's why I'm asking you for help and sharing what you can so that I can repair my ESII. I haven't found any other way to contact you, so I'm writing here. It's best to write to my address: ituitam@vp.pl Regards, Ireneusz

Wow so talented.

I am so impressed with your skills. Fantastic job. So interesting.

I'm going to have to do this to my JV-80 - hence why I watched this video. The topmost E flat and A flat keys are stuck every time I go to play it. I can free them up by wiggling them, but it needs a more permanent fix.

Are you going to do more camera repairs? This was a very nice series even thought I didn't understand the details at all.

I'm curious about that key after touch strip. Does that strip also inhibit the sound when you let go of the key or are there individual felt pads for each key that do this? I had the Roland authorized service center replace a broken key about 20 years ago. When I got it back the new key was quiet but many of the other keys were still making a lot of noise (when released).

Thank You so much for this video! It helped me a lot with keybed of JD-800.

I think you can confidently regard yourself as a world leading expert on this model; others will be referencing YOU for advice. My ES2 still works, but usually caps at 1/1000. (Turning the camera upside-down reduces the weight of the mirror and sometimes helps with this.) Anyway, I found you on the Pentax Forum and will subscribe here as well. Thanks for saving this example from the past and keeping it from being scrapped.

Thanks for the vid, I was able to save my JV-1000. I was driving home and someone left the roland on the side of the road because of the glue

That's was amazing series. Thanks for your work!

Hi. Could you be so kind as to tell me what the active ingredients are in "Mellerud Rohr Frei" I'm in South Africa and want to get something equivalent locally. Thanks

I used caustic soda dissolved in a bucket of water to get rid of the glue on my U20 etc never found a good glue to put the weights back on. On my JD800 I bought new keys from Roland at about £100, well worth it IMHO.

Hi Edwin, long time no see since TRF closed. And great video summarizing a lot TRF stood for. Let's maybe reconnect, we had such a great discussion about "immortality" of QM observer if you remember :)

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