Видео

Any suggestions for a crapped out AM tuner? No idea what happened, it just stopped working. Antenna is intact.

Trevor! Can work on my Denon CD Burner ? it does the same thing with the door opening and closing and I am not getting audio out from the right deck left deck works perfect Thankn You .

an I send you mine for repair?

Is there an advantage to hot checking the outputs vs diode check? I took some heat shrink on my probe tips and trimmed off just enough for the tip, with my shaky hand I have slipped and damaged. I have a gaggle of old Fisher stereos, I prefer this over the AV, which typically need a unobtainium DSP chip anyway. You can count on cracked solder on those older Fishers units, they used cheap solder I think.

I had problems with the remote for mine. Bought a remote rebuild kit, replacing the rubber pads inside. It worked!!!! For about a month 😢

From what i have gathered over many years of owning NADs the early ones (e.g. 3020, 3130) have the best sound and build quality, they will still need servicing and recapping to get the best from them obviously, i generally go for the ones with phono input and banana plug speaker terminals. all still sound very detailed with sweet treble, good bass and punchy sound.

What are you using for a dummy load?

Hi there, that was a great video. I have a unit exactly like that but I have a different kind of problem with it; when I press the switch on, I can see only those tiny LEDs on both sides of the panel on, but no display. The relay from main power source doesn't click either. The good news is that all fuses from power source and amplifier board are all ok. So, would you have a clue where the problem may be? Thank you so much for any imput and I appreciate your attention.

One day I was needing a fuse and went into our repair department to get one. Our department was will organized and all parts were in those plastic trys that were labeled as to what part was in each one. I happened to notice a tray that said "Ball Busters," I opened it and it had an array of bad parts from capacitors, transistors, integrated circuits. I must have laughed till I cried ,this techs history was in that tray. He did not like to be beat either! Dr. Dave

Will putting a thin coat of ox guard on all the legs of the output transistors keep them from corroding inside the sockets they use that on aluminum on your electrical wiring on your main cable coming into your house and on commercial buildings

Try reconditioning them and see what happens. I suspect they are beyond their storage life. Old caps breakdown when not used because they are not continually reformed.

I will give you credit for your PATIENCE. But I can't imagine how much this cost to repair.

These crummy auto reverse mechanisms are nothing but a pain. They always end like this. I would never buy one for this reason and the fact that they offer poor quality sound, I mean the heads physically rotate leading to azimuth alignment issues. I have recently picked up my AKAI again and am enjoying cassettes once again. I wouldn't ever buy an auto reverse deck even if were a NAKAMICHI. Just too much to go wrong. I'll flip my tapes myself.

Other, If solenoids are not activating then look at the capacitors in the plunger circuit. They probably ate the copper traces 😂. Trevor, Btw, where did you get pinchroller and idler ?

I believe that a receiver that sensitive with selectivity that surpasses many other receivers, would have a filtering circuit that would surpass many other radios.

Thanks for showing this failure as a warning to others. I've got an Onkyo PR-5508 pre-pro with the same chip exhibiting the same problem. I bought it new from an on-line retailer at a massive discount years ago and now I know why. I've been simply doing the heat treatment to the chip every year or so to keep it running, but considered replacing the chip for a permanent fix. This shows I would probably end up with a boat anchor if I tried to replace the chip. I guess it's not that big a deal to heat-treat the chip once a year since the unit gives ample warning and ability to use it as the problem creeps back. It's not like I have to cross my fingers every time I turn it on. It's either the annual heat treatments or pay $2k for a comparable pre-pro. I opt for the former as I'm really not that into music and home theater anymore to put another dime into my sound system.

Sometimes you gotta shotgun.

Where you located and do you do repairs.

New to your channel. I have a JVC KD-V6 that needs servicing. Needs belts and one channel is dead. I ordered a service manual thinking it may be helpful when I find a technician here in the Dallas/Ft. Worth area. Are there parts available so it can be repaired? Thanks in advance.

Hey Trevor, I have and occasionally use a DX-160. With a nice piece of copper in the air, it does ok. I ain’t been inside it yet except to poke around and my SDR runs circles around it of course but, there is something about the twiddling of knobs and skimming the bandwidth that keeps the old set alluring. Thanks for the tidbits. I’ll put them to good use someday.

Awesome overview!!!!

There is a reason they use plain bearings and not ball races, noise, plain bearings are quieter, especially at low budget levels. Ball bearings come into their own at high speeds, not an issue with turntable RPM

Watching you take apart and clean that multi-switch was not only a masterclass it was riveting. My 330B could certainly use a deep cleaning but for now that switch just gets a little extra fiddling.

Do you still have the harmon kardon hk 870 that you rebuilt for sale? I'm interested.

This is WAY over my capabilities. To upgrade the motor!? I would just change it. The most common problem with every Thorens is they stop changing speed, but few people play 45s anymore so live with the deficiency. This is a one of the few repair uploads that actually educates those who want to understand how these Thorens can be fixed. Thank you.

I've been tinkering with electronics for many years and always disassemble broken things. I never knew that something so complicated could be stripped down so thoroughly and successfully repaired and work like new. I learned so many things, like taking apart a relay and cleaning the contacts. I have a cheap GRACE TAPE2USB II that won't play and when I looked inside didn't find anything obviously. Now I'm ready to go back in and take another look. I'm subscribing and I look forward to watching more episodes. (Oh by gosh, 233 prior to this one)

I'm not sure what exactly is happening however here's my .02 worth... It seems to me the replacement DSP chip was nothing more than a blank. Meaning: It's the right chip part number but does not have the internal firmware specific to that make and model of receiver. The firmware is subject to a licensing agreement between the chip maker, Dolby and other digital audio companies, and the receiver manufacturer. As such it's not something readily available to the public. Trying to get the firmware and get the receiver working as it once upon a time did would be quite difficult and probably way beyond the budget of most electronics enthusiasts. The time and resource investment would be huge. I've been working on trying to bring these old beasts back to life and it's just beyond my patience and resources. However all is not lost. What I've seen: The schematics for these receivers is available for free online if you search long and hard enough. When the DSP goes so does the volume level for the main and possibly the zones. The video input, output, and video up scaling is gone. Any kind of on screen display in composite, S-Video, or RGB video is also lost. Without the DSP what you're left with is a fancy analog audio switchbox and however many power amplifier channels the receiver came with. The amplifier channels are not that robust and my opinion is to scrap them for amp parts to the end of building something much more reliable. Yank the HDMI board. Throw it away. You will thank me later. Some of these receivers run without the HDMI board behaving the same as yours currently does. Some require restoring lost pass through signals from other boards and the most notable loss was the ground connection. The schematic is your friend in hunting down what's lost. Some have serial ports or the capacity to add a serial port capable of talking to a PC. This opens up all kinds of possibilities limited only by your imagination and usage of resources at your disposal.

Hi Trevor, I suspect that these large plastic wheels for the tuning have shrank. It seems it is made of that same plastic you sometimes find cast around steel axes, and there the plastic shrinks and then breaks because the steel is not shrinking with it. That would explain why the springs for the dial cords were flat out, and why the tracking was often off. And for the hum, I think I noticed that it was 50Hz (or 60), not 100Hz (or 120) on your scope ? And when I heard it the first time it also reminded me of a hum caused by a short, so my thought was that one of the diodes or caps parallel to them is bad. Still, you removing that one cap in the power supply made it really work a lot better, so.... I am in doubt. Nice receiver....

Just wish the bands on this side of the Atlantic was as crowded with stations as it is on your side. Can hardly get anything here, even at night.

5+ minutes with an intro plus fiddeling with knobs (part of every video) + 25 minutes of alignement and tweaking can be left out. I stopped watching, only to find out there is a part 2 🤨 Your videos used to be more informative and entertaining.

Do you have a giant antenna array, Trev ?

Tweaking trimmers and diddling inductors for hours on end is always enjoyable. Time just evaporates.

STOP SENDING THESE BORING SCANNING THE CHANNEL BANDS !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1 REPORTED

Bridging C71 with another cap reduced the hum. Could it be that adding the higher value was correcting for a faulty cap? Was the original checked for spec? Great video, thanks

STOP SPAAMING WITH 2 VIDEOS !

Selling?

I'm not commenting on this particular deck, but some decks are designed, produced, and out to sell only - litte thought gone into serviceability. These are a bit of a nightmare.

Wow, 1980!, and I thought it was more modern! Still the ICs have helped to remove a lot of excessive ccts and wires. It's a game swings and roundabouts - easier to work on, but are some of the ICs proprietary? That can be a problem.

Very nice machine, and well worth restoring.

In the analog era, the beautiful design and creative function of Japanese audio have entertained many audio enthusiasts. In particular, the design of various cassette tape recorders is admirable. We thank the Japanese for their great contribution to audio culture.

What a terrible design. It's a pain in the butt! I had to replace the o ring but I made the short cut (no disassemble). Also mine has the same issue with the tonearm (it doesn't want to go down). I'm still in the process but this tt is for people like you, with tons of patience!!! Congrats!

It's not line it's live