There is a difference between electronics technician. Lots of technicians out there. Diagnostic engineer is a more appropriate description. Anyone can change parts, but you really have to understand how a circuit operates to be able to dive in and find the actual component that has failed. That is the difference. These days most service people are technicians. They change an entire assembly or board. Design engineers dream up this stuff and build it. Quality Assurance engineers take the original design and bring it to fruition and get the bugs out. Diagnostic engineers troubleshoot the equipment that breaks down. They also work with QA engineers when a pattern of failures are occurring to get the problem they are discovering in the field corrected. I used to work closely with a few key QA guys at Sony and Panasonic when I started finding multiple failures. Like the counterfeit horizontal output transistors that flooded the market in the mid 90s. I and a few others started seeing a wave of new parts fail. I was one that cut open a failed replacement and compared it to a failed OEM part to discover that even though they looked identical on the outside were totally different on the inside.Now I left that job in 2003 but have kept active so I don't lose the skill set. Most jobs are pretty routine, and then a wrench gets thrown in like this one that requires thinking about how the unit actually operates.
@@12voltvids That was supposed to be an expression compliment, but you're now right about that not being a great thing to compare to, as in a crime, you don't really know where to start. I love collecting these vintage electronics, and I only wish I had as much skill and knowledge as you when it comes to fixing these things. Anyway, that was amazing! Keep up the good work, as you keep teaching me new things everytime and never fail to impress me!
@@12voltvidsyou remind me of the horrible time to be alive and work on boards during the great cap plague of the early 00s from our good friends in Taiwan… they were a dime a dozen and manufacturers that went el cheapo long ago loved them and didn’t care about longevity.. unless they were good Jap Caps like Nichicons and whatnot it was a rough time especially now replacing em
People just dont know how complicated this equipment was...back then we have a late 80's second hand hitachi vhs player here in philippines bought from japan. As a kid i used to adjust the knobs even if i dont know japanese but i just remember back then i was like a professional grade player from TV stations. When you open the unit the PCB was very complicated..IC's back then has simple function..amazing how i look and play at it when i was a child..inspired me in electrical engineering. Cheers Sir.
I've seen this before. Happened to me at least twice with semiconductors that were covered with cap juice. The plastic package is not hermatically sealed, things can get soaked though, especially around the legs. One instance the transistor was tesing OK with diode check, but it lost its gain.
Years ago, the faults were power regulators and resistors, but caps have become utter crap!. Intermittent faults are a bloody nightmare. Hairline cracks i really hate :-(. Good thing you tested over night :-D
I have seen this happen many times. Yamaha A/V amps use a memory back-up capacitor that leaks and takes out the i/c for the display giving a blank or corrupted display. Changing both is no easy task due to Yamaha doing away with the access plates, so the whole pcb has to come out!
No thought has gone into these designs in regards access for servicing them. As they age, you don't want to be removing a load of other parts to replace the faulty components or more faults will arise.@@12voltvids
Can you please tell me what is going on with my jvc vcr when I put the tape in and press play it plays normally for about 4 seconds and goes into stop then I press play again and it does the same thing over and over.
Hey Dave, don't you hate BOOMERANG jobs. That is similar to working on old Harleys. Some dealerships don't work on older HOGS because if you touch one on a repair, you never know what else is going to fail. Here in HOUSTON we have been getting plenty of rain and some flooding. Yes, Houston....we have problems... (especially if you live in a low lying neighborhood. It is good to keep valuables and electronics off the floor if heavy rains are expected. In some cases, the high water happens AFTER the rivers crest because some dams open flood gates days after ....to avoid retention walls from bursting. Keep yer' chrome dry bro.
My grandfather worked on titabuc. Not on the ship, but building it on Ireland. When i was a kid I made a joke at my grandmother's house that was why it sank. I didn't see the rolling pin flying in my direction but i sure felt it! 😂😅😅😅
A linear supply is a simple device. Why did they fail so often in this model? Just a bad lytic formula? Maybe Mitsubishi bought counterfeit "Rubicons".. hah! 😂
More than likely operating too close to max. Putting a 16 on 12v rail that is running between 12 and 14 with voltage fluctuations. They are before the regulator so they will float higher. Should have put 25 on 12v supply. Remember Mitsubishi made famous but short running aircraft in the 40s. That would be the Mitsubishi zero. I hear there are hundreds of them under pearl harbour.
@@12voltvids Figures. Have you done the calculation to see if the main filter caps even have the correct uF for the job? I bet they cheaped out on that too. I always enjoy failure analysis. But, if engineers had their way, we'd all have products that last 100 years.
I have a mitsubishi svhs from 2002 are those reliable its never giving me a problem unlike my svhs from 1989 that thing always had an issue. @@12voltvids
Wow, you are so amazing at solving mysteries like a crime scene investigator, great job!
There is a difference between electronics technician. Lots of technicians out there. Diagnostic engineer is a more appropriate description. Anyone can change parts, but you really have to understand how a circuit operates to be able to dive in and find the actual component that has failed. That is the difference. These days most service people are technicians. They change an entire assembly or board. Design engineers dream up this stuff and build it. Quality Assurance engineers take the original design and bring it to fruition and get the bugs out. Diagnostic engineers troubleshoot the equipment that breaks down. They also work with QA engineers when a pattern of failures are occurring to get the problem they are discovering in the field corrected. I used to work closely with a few key QA guys at Sony and Panasonic when I started finding multiple failures. Like the counterfeit horizontal output transistors that flooded the market in the mid 90s. I and a few others started seeing a wave of new parts fail. I was one that cut open a failed replacement and compared it to a failed OEM part to discover that even though they looked identical on the outside were totally different on the inside.Now I left that job in 2003 but have kept active so I don't lose the skill set.
Most jobs are pretty routine, and then a wrench gets thrown in like this one that requires thinking about how the unit actually operates.
@@12voltvids That was supposed to be an expression compliment, but you're now right about that not being a great thing to compare to, as in a crime, you don't really know where to start. I love collecting these vintage electronics, and I only wish I had as much skill and knowledge as you when it comes to fixing these things. Anyway, that was amazing! Keep up the good work, as you keep teaching me new things everytime and never fail to impress me!
@@12voltvidsyou remind me of the horrible time to be alive and work on boards during the great cap plague of the early 00s from our good friends in Taiwan… they were a dime a dozen and manufacturers that went el cheapo long ago loved them and didn’t care about longevity.. unless they were good Jap Caps like Nichicons and whatnot it was a rough time especially now replacing em
Murphy's law. Anything that can go wrong, will. Great re-repair!
People just dont know how complicated this equipment was...back then we have a late 80's second hand hitachi vhs player here in philippines bought from japan. As a kid i used to adjust the knobs even if i dont know japanese but i just remember back then i was like a professional grade player from TV stations. When you open the unit the PCB was very complicated..IC's back then has simple function..amazing how i look and play at it when i was a child..inspired me in electrical engineering. Cheers Sir.
I've seen this before. Happened to me at least twice with semiconductors that were covered with cap juice. The plastic package is not hermatically sealed, things can get soaked though, especially around the legs. One instance the transistor was tesing OK with diode check, but it lost its gain.
You got it. This defied gravity though unless it was stored on it's side and from the amount of dust on the side of the drum it probably was.
Years ago, the faults were power regulators and resistors, but caps have become utter crap!.
Intermittent faults are a bloody nightmare.
Hairline cracks i really hate :-(.
Good thing you tested over night :-D
I have seen this happen many times.
Yamaha A/V amps use a memory back-up capacitor that leaks and takes out the
i/c for the display giving a blank or corrupted display.
Changing both is no easy task due to Yamaha doing away with the access plates,
so the whole pcb has to come out!
I'm working on a Tascam DA30 mk2 now that is built that way. 2 boards out to get to a regulator.
No thought has gone into these designs in regards access for servicing them.
As they age, you don't want to be removing a load of other parts to replace the
faulty components or more faults will arise.@@12voltvids
Do you know how to permently disable auto tracking on sony vcr. It's annoying making a mute spot on the audio when it does it.
Press the button on the remote to disable. Of course you need to do that every time you load a tape.
Can you please tell me what is going on with my jvc vcr when I put the tape in and press play it plays normally for about 4 seconds and goes into stop then I press play again and it does the same thing over and over.
Open the top and see if the tape spool is turning. If not you have a mechanical problem. If so the rotation detection may be faulty.
It turns those 4 seconds and plays then goes into stop and stops turning
Jerry! Jerry! Jerry! Jerry!
Hey Dave, don't you hate BOOMERANG jobs. That is similar to working on old Harleys. Some dealerships don't work on older HOGS because if you touch one on a repair, you never know what else is going to fail. Here in HOUSTON we have been getting plenty of rain and some flooding. Yes, Houston....we have problems... (especially if you live in a low lying neighborhood. It is good to keep valuables and electronics off the floor if heavy rains are expected. In some cases, the high water happens AFTER the rivers crest because some dams open flood gates days after ....to avoid retention walls from bursting. Keep yer' chrome dry bro.
You ran Titanic through it... There's your problem right there! 🙂
My grandfather worked on titabuc. Not on the ship, but building it on Ireland. When i was a kid I made a joke at my grandmother's house that was why it sank. I didn't see the rolling pin flying in my direction but i sure felt it! 😂😅😅😅
Did that bird get electrocuted! 😮
No it actually was just stunned
A linear supply is a simple device. Why did they fail so often in this model? Just a bad lytic formula? Maybe Mitsubishi bought counterfeit "Rubicons".. hah! 😂
More than likely operating too close to max. Putting a 16 on 12v rail that is running between 12 and 14 with voltage fluctuations. They are before the regulator so they will float higher. Should have put 25 on 12v supply. Remember Mitsubishi made famous but short running aircraft in the 40s. That would be the Mitsubishi zero. I hear there are hundreds of them under pearl harbour.
Underrated caps,
@@12voltvids Figures. Have you done the calculation to see if the main filter caps even have the correct uF for the job? I bet they cheaped out on that too. I always enjoy failure analysis. But, if engineers had their way, we'd all have products that last 100 years.
I don't think your Canucks can beat my Avalanche in the playoffs!
This could be the year. They are No 1 in the division
I have a mitsubishi svhs from 2002 are those reliable its never giving me a problem unlike my svhs from 1989 that thing always had an issue. @@12voltvids
💯⭐️🇹🇷👍 Stokta 100'e yakın betamax ve vhs cihazım var, 10.000'e yakın betamax ve vhs kasetim var, bunlar mükemmel cihaz ve kasetler.
Wtf was that intro 💀
What the cooked goose?
@@12voltvids does the goose become edible after that?
@@VHSGUY_ANALOGCOMPANY well considering it flew away after waking up.