Sony TAAX390 sound cuts in and out one or both channels intermitantly

[@cathal1982]

Most of us hate adverts, but I like this guy's videos, and I watch all the adverts on his videos to help the guy. May I suggest you all do the same so that he can get some return for the entertainment he provides. Keep the videos rolling 👍

[@80slover39]

Love your videos! You gave me some of the skills and confidence to repair my 10 year old flat screen TV. Your "gentle-tapping" technique found an issue with a ribbon cable connector (intermittent vertical lines). A close inspection of the solder connections in several places near the HDMI connectors found some that benefited from re soldering. Issues corrected, saved the cost of a new TV!! While I don't have any of your electronic knowledge to troubleshoot components, your methods are sinking in! Seeing some of the older equipment opened up brings back fond memories of building Heathkits, many years a go. Thanks for sharing your expertise!

[@theannoyedmrfloyd3998]

Percussive diagnosis.

[@musictypefoundry7345]

Thank you so much for this video! I know I'm late to the game, but it was most helpful in debugging a preamp's similar issue. Output is now crystal clear and solid on both channels!

[@jeremytravis360]

I find it very soothing watching a couple of your videos a day. I'm glad you are making them. I do have some of my own tips which I found work but I will mention them if you like ?

[@THOMMGB]

Dave, I have a Technics SA-200 amplifier from the late 1970's that had a similar problem. I bravely and very cautiously took it somewhat apart and managed to resolder a couple of cracked solder connections. Problems solved and it worked! Whew! I was so surprised and pleased. And lucky. Next, I need to clean the controls as they're somewhat touchy and scratchy.

[@KHzSineWave]

Once again, more great work from the detective! I had the same issue on one my units, only my bad switch was the tone defeat, taking that little switch apart was a pita, I used a pair of flush cuts to squeeze the tabs together, I found that using metal polish on a Q-tip is also great for cutting through the oxidization. I was very tempted to just bypass it ha.

[@ricfair9919]

Would of never thought to check the speaker switch. At the beginning I wondered "what is he going to do for the next 20 minutes since the unit is fixed?" You answered the question when the switch was taken apart.

[@12voltvids]

I thought i had it. I had the video all edited and walked back into the shop and WTF, one channel out again. Remember initially i tapped the front panel and it kicked in and i suggested it might be on the front board initially (or was that cut i forget ). Anyway yup the switch was bad.

[@electronicengineer]

Nice job Mr. Dave! Thank you, as always, for sharing your electronics adventure with us! I appreciate you sir. Fred

[@alexispieltin9379]

Nice job again. And another happy owner of a 30 years old piece of equipment. Low end probably, but well designed with service access and quality ICs. The speaker switch is a nasty surprise, as it's branded from Alps, it should be first quality stuff, but it's apparently not the case. Here comes a design and economy point, top amps use relays to switch from A to B, so the selector is simpler (or absent if driven by processor). This is also an ultimate solution, as these complicated slider switches are always difficult to source (and costly!), If you can't supply them as spare parts, some replace them with a relay board with a simpler switch. And as far as you get plenty of room available in that kind of amp, it's no problem to mount that near loudspeakers output connectors.

[@Sans_Solo_]

Excellent Job Dave!.....finding that switch problem was stellar

[@12voltvids]

They don't fail that often but they do occasionally. It has been 20 years since i saw a speaker switch fail. Input switches are another story though.

[@williamhelms9942]

A car started in the background as soon as you were touching the Volume! lol! :D

[@itsukiFF3]

the moment he press the CD button, a car door closes, perfect timing:D i had to rewatch that moment:D epic

[@algerian8862]

nice observation

[@casperjensen1769]

Nice Job scotch brite cleaning pad is really good

[@dwoodog]

Great job. Hope the owner found some sentimental value in this unit, since IMO this low end Sony is not worth putting any real money in to.

[@1959Berre]

I took apart and cleaned a lot of those switches. Some of them contain grease; spraying that with contact cleaner makes a nasty slurry. With a toothbrush, cotton swabs and lint free paper you can make them brand new. Just be careful when you squeeze the pins, they get easily damaged.

[@thegg5097]

Have the exact same problem with a Denon AVR S-930H. The left and right front speakers intermittently cut out and flip back and forth. Only 1 or the other. If I tap on it sometimes it fixes it. I wish I had a stereo fixer in NJ because they're hard to find

[@d.logic1]

Looks like that speaker switch is made by ALPS. I've got a Pioneer turntable with an ALPS speed selector switch that's been giving me problems (seems to be a common problem). Most say to spray it with contact cleaner but I did what you did and cleaned the inside but I think I'm getting ready to give up and source a new part. It was hell trying to get it back together again because the metal sliders were so small.

[@Oldgamingfart]

Had similar issues with the Source Direct switch in my TA-FB940R. Just couldn't get it clean, so I ended up hard-soldering it into the On position, as I rarely use the tone controls! Perhaps I'll revisit it after seeing this :)

[@t.farris1755]

Lol 😂 that wasp almost made you poop 💩 your pants.

[@12voltvids]

No it didn't but I sure don't like those little bastards. Been stung by too many to count.

[@t.farris1755]

Yea those are some nasty little buzzards.

[@t.farris1755]

12voltvids but hey you do a fantastic job on repairs.

[@samohistory5181]

What was the capacitor size and voltage rating being replaced in the video? I can’t seem to get a hands on ta-ax390 service manual and on the board it’s hard to see without pulling cap. out...

[@shivam6504]

the sound is completely cut off in Center and surround channel, now only the fronts work but the sound is cut every 9 secs in front speakers, it only works with direct mode, model pioneer vsx 322. Is the hdmi board worn out

[@will89687]

Nice break from the cat meow - a shorted power supply!

[@12voltvids]

Should put more shots of stuff going boom on the logo.

[@will89687]

@@12voltvids I'm thankful that I wasn't doing anything critical at the time!

[@theannoyedmrfloyd3998]

The cat meow is required audio therapy.

[@umeshupadhyay...]

I always watch your videos on various repairs, mainly deck repairs. I am having one CR7 deck lying with the engineer for one problem of deck changing the mode from plaback yo recordjng when I play the cassette.It happens all of a sudden. The engjneer is asking me to bring the IC , I do not know which one. Kindly inform the solution to the issue. Another Deck 682ZX is making sound when I playbac the cassette, this is I think some caps related issue. Which capacitor is to be replaced in the sudio section. Thank you .

[@TheMamosians]

brilliant vid thankyou

[@Bluethunderboom]

Speaking of bugs, I had an invasion of red wasp back in June of this year, and I have to use anti-wasp spray to penetrate against red wasp who is swarming around where they are trying to build a nest, and then, I have a nest up on my ceiling in the shop, then when there is no wasp around at the envelope cone, I quickly use a broomstick to remove the nest from the ceiling, and find the nest real quickly before the red wasp will show up again, then i found it laying in the box, and then, toss it out right under the bush because, there's birds, squirrels, et cetera et cetera who can have larvae for their hunger out in nature. Back in my shop, I immediately spray the remaining of the spot including the wasp nest where the wasp will not come back again. Oh red wasp is a pesky wasp that I ever dealt with that every year, and it never fails, same thing as for German Yellow Jackets two that they are looking for to shelter themselves inside the walls. =( Now for the real friendly bugs, I have a dragonfly who came for visit, and it was pretty cool, the cave cricket and the crickets did came for a visit two, the grasshopper came in there two, and then all behold, THE GREEN CICADAS visit to my shop for a while! I capture on video about the green cicadas who visit to my shop, and I noticed what they are doing is looking for a lights, and then they are doing some tours of what it looks like in my shop, and at the end, I took one of the cicada out of my shop, and let them go free, and the other cicada stayed there for a night until morning, they left from my shop and never coming back.

[@theannoyedmrfloyd3998]

2, too?

[@downtowngutter3875]

I saw a Sony diskman d-245 from 96 at the thrift store for 2 dollars should I have gotten it?

[@12voltvids]

I have to start visiting thrift stores again. Hidden treasures in there.

[@CliveTrezona]

Looks like that iron tip is loose there?

[@mrnmrn1]

0:25 What kind of meow was that?! :) I'm at the intro, my bet just by reading the title was oxidized speaker relay. I'll see later if I was right.

[@mrnmrn1]

OK, now I realised it's a 42 min video, it won't be just the relay.

[@mrnmrn1]

2:00 oxidized wire-wrap connections?

[@sumitpaul9755]

I have a sony MHC RV5 mini hi fi system it is in power protection mode. I changed the STK 402 - 120s but it wont fix the problem. need your suggestion regarding this problem how to fix it. It continuously burning my speaker.

[@mrnmrn1]

30:44 Yikes! 'Fine' Al oxide paper? I used to use 1200-2000 grit polishing paper for this. This was maybe 400 or even 220. Probably not much left of the silver plating after this. I really don't get why everyone, even Alps using silver plating on sliding contacts. It is well known it will tarnish. Even nickel plating would be better, but of course, gold plating would be the best. And if they used silver plating anyway, at least they should fill the whole switch with silicone grease, to protect the contacts from air. I used to do this with the switches I repair, that way they last longer than they lasted in their original state, out of the factory. Especially rotary enconders, including VCR mode switches. Some of the mode switches which I took apart just for preventive maintanence were filled with silicone grease out of the factory, and I ended up putting them together without cleaning them, because the contacts were perfectly shiny, no tarnish at all, except the fixed end of the moving contact, which was not covered in grease, and it was completely black from silver tarnish.

[@12voltvids]

This is not a low signal switch. It is a speaker switch. Even with no playing the copper is a good enough conductor. This aluminum oxide paper was not ground in, it was lightly rubbed just enough to break through the surface crud. It was nutrol on a cotton swab that took the majority of it off.

[@nickfrench7372]

Can't believe how those heatsink contact connection wasn't soldered into the circuit board earth points.

[@jasonmorgan661]

😁I'm always breaking my VCR and every other dvd is scratched up and my Blockbuster videos are overdue and unwound....This is 1997 right? 🤪

[@christophermarshall5765]

Are you a "Ham Radio" operator? If so, listen out for VK5FCHM in Australia.

[@12voltvids]

I am but not active on hf. 220 for the most part.

[@christophermarshall5765]

@@12voltvids fair enough. When I am active here, I use the local 2m repeater or I am on the 40m hf band for dx.

[@12voltvids]

@@christophermarshall5765 I am active on 2m 1.25m and 70cm. I do have an HF rig, but seldom turn it on due to the extreme electrical noise problem I have around here. I do have a 40m dipole set up that can be tuned to 80 and 20 no problem but I can't even talk local, as my friends are all vertical and I am on the flat side.

[@Joël-l5s7c]

what output channels does this amplifier have

[@zx8401ztv]

Well done dave, that was a fecking mess. Crack city. You could not have turned that sony on at a better time, the car starting in the background was perfectly in sync :-D I've seen tape mode switches that were black inside, but that speaker switch was the worst i've seen. I use the fine rubbing blocks that are abrasive dust and rubber, ideal :-D Better known as Gary blocks for car paintwork polishing.

[@Jamesnov1970]

I Have the AAX295. Almost looks the same as that inside.

[@BGTech1]

I got one that doesn’t work at all and if I can’t fix it’s going to get scrapped

[@chrisg.4498]

Nice Job!!! Does anyone have a service manual for this model they can link me to or send me please? i have some blown fusible resistors on the output stage that are beyond recognition.

[@12voltvids]

Try HiFi engine.

[@Auie_Chris]

Tried there but they don’t have it. I posted a request. Thanks

[@williamhelms9942]

I'll bet that that's what's wrong with my STR DE845, I'll try reflowing the traces when I get time. Thanks!

[@jeffadams5510]

Been there/fixed that-many times :)

[@Synthematix]

Christ no wonder the speaker switch went bad, it looks like theyre running 65 watts of speaker power through it directly

[@GeorgiusOrlandus]

I have the same issue with an amplifier just like that one.

[@jasonmorgan661]

I'm so tired I couldn't saulder the broad side of a Namco board.

[@theannoyedmrfloyd3998]

Saulder ® solder?

[@DH-ww6di]

Man I wish mine worked. I can’t throw it out.

[@12voltvids]

Some times you have to let go. I take stuff to recycling weekly. A couple of TV's next. One works but I haven't even been able to give it away so off it goes.

[@showstopperrob1097]

Next time remove old solder and then use new. This what I saw you doing is not proper soldering but glueing.

[@12voltvids]

Opinions are like assholes, everyone has one. Been doing this for 45 years and never had a problem. Only time this is valid is when working with BGA and surface mount flat pack ic. Through hole not necessary new solder will mix nicely. Lead free is a different animal but leaded solder no problem.

[@slayufa]

Sombody are drilling on groundsound in every video :)))) - Кто-то постоянно сверлит на заднем плане в каждом видео :)))

[@theannoyedmrfloyd3998]

Man, you have noisy neighbors.

[@12voltvids]

Could hear them all the way to the corner.

[@joshm264]

Don't your neighbors know that you have a business in your garage? Maybe once you get 100K subs you can tell them to be quiet because you're making videos

[@12voltvids]

The saw noise is a contractor working up the street. The kids talking so loud is because they are all deaf from headphone use.

[@joshm264]

@@12voltvids The second one sounds way too familiar, and I'm a teen, but because I've had hearing problems since birth (read: 5 sets of ear tubes), I have to turn up the volume to understand people in videos and such

[@12voltvids]

@@joshm264 Try being in a rock band when you were a teen like me. We played black sabboth, cream and all the other metal of the day with the volume cranked to 12. All 4 of us blew our ears up. I played bass. I was at the back of the garage next to the drums and amplifiers.

[@pliedtka]

Modern piece of garbage... full SMDs - pain to work with.