Welcome to my channel. I am an electrical engineer and I am professionally involved in the design and development of printed circuit boards in metrology. Privately I deal with rare tube measuring instruments and computers from the early days of the computer revolution. Also professional studio audio equipment is a specialty of mine.
For my projects I use software like KiCad, Gimp, Blender from blender.org and many more useful ones.
I'm not responsible for anything you do to your electronics and/or yourself. Do all repairs at your own risk!
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Borders look better
Como saber se o Diodo P6KE18CA, está bom? Ou aberto?
Great video. Mine is also a BA662 version. In these early units there’s an issue where the LFO will leak into the audio output when the filter mod amount is set high and LFO speed is audio rate. Have you noticed this in your unit? Cheers.
Really excellent work ... I've recapped many of my synths but I've stayed away from CMOS chips (ANY chips for that matter)... maybe I'll get brave and try and do a complete service one day ... great job 🙂
Thanks!
Watching closely as mine needs work.. thanks for uploading this
Hello, I'd like to make some of these myself and I'm trying to find the parts. It seems the inductor XAL5050-562MEB is not available any more. Is there a replacement? Also, what is the part called you used for the contact pins?
nice like 36
Good luck with the JP-4 restoration... it's an oldie bit a goodie. These type of repair videos are a great reference source if we're ever in the same situation ... I replaced the dull green LEDs on my old Yamaha An1X on the weekend with much brighter orange LEDs and everything I needed to know was posted on YT.
looking forward to this! i have a jp4 where the only sound im getting out is the LFO, no voices can be heard. would like to diagnose the problem of this beast!
I made a template on my 3d printer so I could get a perfect sizing for this.
Fatiha for Sultan mehmed Rahimullah
I am restoring my old vic and would love to have one of these. Do you still have any of them?
One more question: how did you open it?
With all the "epoxy" talk it sounded hard to fix, but this actually looks pretty easy. Seeing this I envision an even easier fix: remove the PCB completely and put this piece inside: IRM-10-5 Meanwell PCB all-in-one switching PSU.
Hello, with some PSUs it is easier, with others it is not. Mine here was very easy to open, but I have also had some that were very difficult to open. Sometimes too much epoxy has been filled in, which makes reworking even more difficult. The idea with the IRM-10-5 Meanwell is a good one. However, this model has a ripple of 200 mVpp, which is very high. Computer chips from the early 80s are sensitive and should not be exposed to high ripple for too long. In another video, however, I followed a similar idea and installed a voltage regulator that had a ripple of about 20mVpp.
hi any chance u could tell me where the long silver Pin at 16 minutes 12 seconds places inside the meter, please, many thanx M
It is the silver PIN for the collar. You can see how to attach it from minute 18:40.
man, cutting the plastic is horrible.. did it like 4 or 5 times.. im still waiting for factory-made plastic shells for these laminated screens..
Thank you for the video. Today I received from a cinematographer friend, a Minolta Spotmeter F and a Minolta Autometer IV F. Neither of them are working. The display goes blank. So I will use your video as a reference to review the power button cables, their cables and connections. Thank you!
What would be cool is a sided by side comparison of the old one and this upgrade.
We hear your mic on but you can’t talk?
How's the battery draw on this mod? How many watts?
Great job on the design and PCB's. Unfortunately, the next part of this video is missing. I was really looking forward on seeing how you got along!
Does anyone know what The Component is? Tiny nuclear reactor?
It's a coil. 😄
Hi, I was so happy to find your video. I recently bought one of these on Marketplace and it worked when I tested but when I went to use it on a shoot a month or so later the measuring button does not work. All the other functions seem to be fine. I can change settings as needed but when I press the measuring button it always reads "0". I can see the switch assembly clearly at 5:00 in your video. Any tips on how I might repair it? What I should look for. I had a similar problem with an old Minolta incident meter where the unit worked but the on/off button did not function (I could power up by popping the battery in and out). I successfully repaired that by disassembling and cleaning the trace with contact cleaner. Maybe this one functions in a similar way? THanks.
Hello and thank you for your question. The problem with the pushbutton could be quite banal. It is possible that a cable on the pushbutton has come loose. These devices are over 30 years old and it can happen that the solder joints break. Maybe you should just open the unit and see if any of the cables are hanging freely. My guess would be the cables on the pushbutton. One of them could be loose. Then just solder it back to the right place.
Thanks for the quick reply! I will give it a go and report back. :)@@DigitalArtDeco
Now I know how to get in there if my Spot-F ever goes down. I would also take a swab with some alcohol on the tip to clean off the inside ends of those contact switches or buttons, just in case one of them was touched and picked up some hand-oil while working in the insides.
Hello. I've just received mine, but my viewfinder is different...Some Minolta F spotmeters have flat viewfinders, some of them have protruding one. Why it's like that ? Also, I don't know how to turn eyepiece to make a dot a bit sharper inside a viewfinder, do you know anything about it maybe ?
The viewfinder should be rotatable to focus the spot. If it is not, please check if it is modified. Possibly there is also a previous unsuccessful repair?
@@DigitalArtDeco Thanks for the answer. I don't think there is a way to check if it's been modified. I thought that maybe there are a few versions of this lightmeter, and mine hasn't got this option to turn viewfinder.. It's rigid. Also, I'm not sure if it's taking correct measurements. If I got it right, the quickest way to measure the scene is to point it, shoot it, and reading shoud be on display, am I right ? First you need to set up shutter speed, let's say 1/60s, and later you can find desired combination of aperture and shutter speed by pressing arrows ? But if the reading of Aperture shows 5.6 and 1 (little decimal 1) - whats the Aperture value actually ? I compared the values it's giving me with my inside -a-camera lightmeter, and they are different..............
No audio, waste of time!
I’d like to know where you got the screen and the item/part number.
Just search for "Game gear lcd" on e.g. Aliexpress. You will find what you are looking for.👍
Brilliant. Instant sub.
Great video! I bought a game gear micro and the screen broke. I tried to fix it with a screen from a smart watch, and the lcd light came on but no image. Maybe one day you can do a screen mod on that since there are no replacement parts available? I’d love to see it. Thank you.
the screen broke itself..?
Awesome job!! 🎮
I have one and it has the same defect. Nobody could fix it sadly.
Use a fuse before a TVS diode and a common mode choke followed by a capacitor after that. Mild spikes get clipped, but major ones cause crowbar effect. You can also use a FET follower that cuts the power when the TVS cuts in and trigger a crowbar circuit with a super fast transit time. I used circuits like that for protection of RF amplifiers.
Do you sell the pcbs?
No, but I will put the complete project on github soon as open Hardware.😉
Great stuff! Are you planning on selling it? Cheers
Thanks! But I am not selling it, sorry. 😉
ｐｒｏｍｏｓｍ 🤪
Hello. Really great tracing, congratulations. Would you sell pcbs? Thanks. Adrien
Hello and thank you for your comment. Please contact me with a PM.
Masha Allah Aye muslimo ka Garv se sir uuncha karne wale, Rasul(saw) ki Peshangoi Ko PURA karne wale Mera Salam ho Ap par India
What is the amp on that fuse???
nicc work
Excellent video! Great job swapping these out! People still continue to fit ceramics in place of electrolytics and it really annoys me.
Thanks for your comment. I'm very happy that you like the video.
Great idea. Maybe turn the old badge into a fridge magnet.
Hello - thanks for your video. I am replacing the voltage regulator on my old Vic 20 and then I saw you replacing both on the 1541 disk drive. I bought a PSU5 from EZSBC for the Vic 20 and was thinking about replacing one on the 1541 but I cannot find a similar replacement for the 12 volt. Would you sell me a set? I like repairing the 1541 drives as I also repair Commodore 64's as a hobby.
Hello and thank you for your message. You are right, unfortunately there are no 12V regulators in TO-3 form. Therefore I have planned and assembled the regulators myself. They work very efficiently and safely. No heat is generated! I have also sold these regulators to a few interested people at cost price. Unfortunately I have only a small stock of the microchips needed to make this regulator work. But for two pieces it should be enough for you. :-) Where are you from? Please write me a private mail!
@@DigitalArtDeco Thanks - I sent you an email. Initially I could not get your contact info on KZread as Fedora Linux on my laptop did not like the captcha API. :(
Verily You shall conquer Constantinople what a wonderful leader will her leader be and what a wonderful army will that army be
Good replacement of those terrible ceramics caps. I bet Turrican 2 is not your favourite game :) ! Cheers, M
SUBHANLLAH 🌹🌹🌹🌹🌹
Allah jannat me aala. Maqam ata kare.. ameen
Very nice! By the way, I love that "time travel stuff" box :D
This is the tomb of the real mehmet sultan,,son of hurrem and suleiman the magnificent??? Wowwww..... I love turkish history... And how they preserved everyhting...such a rich culture.... From Philippines with due respect...🥰🥰🥰
Süleyman' s grandfather Beyazıd ' s father.. The great grandfather... 😂 Fatih, Beyazıd, Yavuz selim, Süleyman...He is the greatest Ottoman king. Artitect, genius, He can speak 6_ 7 tongues... Hürrem' s son died for young..
Yavuz Sultan Selim. Sultan is the father of Suleiman, and Fatih Sultan Mehmet is the grandfather of Yavuz Sultan Selim.
Terrible, terrible, HORRIBLE advice. I don’t do my own recaps, I have it professionally done, but I know to listen to the wise people in the community. facebook.com/groups/CommodoreAmiga/permalink/10158438301574157/
ceramic caps.. SIGH! why not use diods or resistors instead when using the wrong components with wrong behaviour? a booting machine is not a proof of correct caps. ceramic caps are voltagedependent so congratulations. you have now a machine that is equipped with caps of wrong capacitance etc..
I totally agree. I made another video for this. I changed the ceramic caps with polymer caps.