Yamaha RX-300U Stereo Receiver Repair

[@pcee9001]

Many thanks. I will check out my receiver that died yesterday. Hopefully one of these common faults will be the cause and can be remedied. You may have just saved me a few hundred bucks.

[@aezram]

Just picked one of these up for a few bucks... For a lower-line unit, it's got impressive build quality and sound, from the days when the stereo market was still quite competitive. Everything seems to function, but when I open it up to dust the board, I may preemptively address the design issues you noted. Many thanks.

[@bluenazz]

I really enjoyed watching that and appreciate your troubleshooting techniques. I also like Yamaha stuff, which is a bonus!

[@GarretClaridgeMeerkat]

@Maxxarcade it says 2215 B (c) on the back, I bought it from an elderly man for a whole 3$ lol, never tested it there but when i got it to the shop it only humms, no display and the controls make no effect to the sound, its been bumped around a bit since being in my house but the thing looked mint when i got it, its going to be a pinata if you or another person willing to restore it will take it, I dont have the patience to repair stuff

[@Maxxarcade]

@Jamafia It's a Hakko 808. You can find them at electronics places, but I got mine on Ebay.

[@Maxxarcade]

@batterymaker I think some of the heat was from resistance in the joint itself, but still...

[@Maxxarcade]

@JeffN727 Most likely the hum was a ground issue. I'll have to try the phono input some time, and see if it still does it.

[@juopotski]

Excellent video! I especially liked the transistor testing part. It's good information for a beginner like me.

[@Maxxarcade]

@Djkyle65 It's a Tenma 72-6685A True RMS meter, with Tenma leads. I don't think this model is made anymore though.

[@Maxxarcade]

@labobo The desoldering tool is a Hakko 808.

[@tnasburypl]

Part free fixes are the best!

[@Maxxarcade]

@Swi2ler Very common, but sometimes the jack itself breaks. Also try another AC adapter to make sure that's working before checking the jack.

[@Maxxarcade]

@RoadentKiller Is the nut that holds the control on the bracket stripped out?

[@AlexAnderDeeJay87]

Yes unfortunately put the stk 4913, i fried one of my test speakers but i got spare ones thank you for your help so much, I'll keep in touch with my progress thank you very much

[@Maxxarcade]

@66maldonado I got mine on Ebay. I think they are just called "wire unwrapping tool". There are different sizes to match the posts. I think the Marantz used the larger of the two that I had.

[@Maxxarcade]

@RodBeauvex Ya, I couldn't live without it, since I do so much repair work. It's a Hakko 808, which is pretty easy to find.

[@65WKFoster]

Great video i like these when you show how you diagnose ect. Great Job!

[@AlexAnderDeeJay87]

I have a yamaha r-50 and it uses a stk ic, i changed the ic. With a more powerful one also stk something it worked on the left channel 15 minute and it made a hum and stopped , the relay doesn't kick, if i force the relay it just makes a buzz and smoke com out of the speakers, can you pleas tell me what to do i cant find any service manual and i dont know where to start please help me.

[@AaronBilger]

i had a question for you i have the yamaha rx v795a and wanted to know if your's ever had the right side have no sound or very little sound from it when turning it back on after a little while or the left side because mine does it but i turn the sound up and then down once or twice then its out of that problem for that time being and my screen is also dim its at full brightness anything to help me on?

[@lineartechbd1600]

what is the brand and model number of that tool you use to desolder the joints?????

[@travisgulley2652]

Hey I have a question I have a Yamaha htr 5440 av receiver and it shuts off when I crank the volume up past half way do you know what causes this to happen and what the solution is to fix this problem

[@AllAmericanFiveRadio]

Very nicely done repair and video. It is amazing how flimsy the construction is. That heat zinc almost might as well not been there for that transistor. Also amazing that it is still good!

[@SailingKitabu]

This video is truly awesome, I have the same unit similar problem however mine does not "click" upon startup. I measured resistance across the transformer primary leads and it is an open circuit. Also, I get 122V at the primary leads with power switch on, and 120V at leads with power switch off... I think the switch shorted which in turn left the transformer power on all the time, and burned out the transformer. Any tips would be appreciated!

[@Jamafia]

question.. what kind of solder gun was that and where can i get one to buy?

[@Swi2ler]

@Maxxarcade i tried another charger and it didn't work, it's a dell inspiron 1100 and the charger port is located next to the heatsink and fan assembly on the motherboard. this laptop is notoriously known for getting very hot.

[@floyd617]

My stereo sound system works fine but after some time the speakers make a loud staticy noise. I canot reduce this sound if i lower the speaker volume, even if i turn down volume the sound is still loud as if the speakers are on full volume with a staticy sound. the only way i can turn off the sound is by turning off the system. and when the static sound comes i dont hear the sound of the music or radio i'm playing. do i have a problem with the stereo reciever or the speakers? sonyX0-950w. thnx

[@garaygeza]

Thank you for this video. I had the same problem and I can repair it succesfully now.

[@saarike]

I really love these videos.

[@Jamafia]

hey i have a Yamaha RX-V620, that power on for 2 seconds then goes off. made a little video of it. can you help please, just tell mi what could be wrong with it.

[@costellom5]

all that for just a solder point? good job.hope you got more on these amps there

[@ecotech540]

Great video ,thank you..I have the same receiver , it used to click on 2 or 3 seconds after the push on button like a relay... today when I push the button on.... display turns on but It does not click. and no sound at all what could that be ????

[@ourplesoop]

I really don't think there is a reason to ever buy new equipment when you have skills like this.

[@twinstarfil5406]

Need help on how to convert my receiver to receive 220-240 volts wall supply from 110 volts without change in its output voltage.

[@Cheese_1337]

you need step-up transformer.

[@GarretClaridgeMeerkat]

i have one! useless for blowing up old speakers I found out because of some silly cut off thing

[@missy9944]

What kind of soldering gun did you use to remove the solder what model is it

[@Maxxarcade]

+missy9944 Hakko 808.

[@fordbroncodave]

where are you located? 107.9 and menards are common in minnesota

[@Maxxarcade]

@lineartechbd1600 It's a Hakko 808.

[@Maxxarcade]

@poopooGarret How much do you need to ship it? I can Paypal ya the money today. I'd love to restore that.

[@Maxxarcade]

The 4913 should actually work. I think it's just rated to handle more voltage when available. Did you use thermal paste between the IC and the heatsink? If you replace it again, look for DC voltage at the speaker terminals before connecting speakers. If there is more than a few mV, something is still wrong. Also any DC voltage on the signal inputs of the IC (pins 1 and 16) will be passed to the output. Make sure the caps are good.

[@bochap76]

I love your videos, I recently got the vintage audio bug and picked up a sansui g-5700 and a pioneer sx 750 . I would like the experience and reward of doing it my self. I have done pc repair and repair since I was 18 (now 36). I don't really have any electronics back ground but I am highly interested in learning; where or what would be the best approach? Classes, books, start tinkering, or all of the above?

[@manyesterdayz]

You have been very helpful. Much obliged!

[@johnturner5700]

Max, I have an early 80's R300 receiver. It powers on and you hear the click after about 30 seconds or so, but it has no sound output. All the lights work on it, just no sound. Do you repair these? If so, where are you located?

[@MrTopsoil911]

i have a yamaha r-s300 & when i press the power button to turn on the led is flashing orange. i disconnected all the spkrs and its on my cabinet just flashing. the relay i hear click but amp doesnt turn on. is there a factory reset for this or what and where on the boards should i start looking. thanks. luv ur vids

[@Maxxarcade]

@poopooGarret Which Marantz is it? I'm off to bed, so I'll follow up in the morning :-)

[@andrealemus1589]

hi my friend i need more information because have problem with my receiver arouw know see the number all transistors out audio

[@Maxxarcade]

@TheMrgeekmania I don't know, it just kinda falls on me from everywhere. Trash pickups, people cleaning out their basements, etc.

[@Maxxarcade]

Do not force the relay, it is there to protect your speakers. But I guess it's too late for that. And your output IC is probably bad. The original output IC is an STK-4873. Did you install an STK-4913 in its place?

[@Cisco2201]

I have the same exact problem it just came out of nowhere, did you ever find out what the problem was?

[@65WKFoster]

What meter is that? Also are those fluke leads?

[@jasonochoa3317]

Can anyone help me out? I just picked up an R5 and when i first found it worked perfect. 2nd day the fm radio stopped working. AM works absolutely fine. Any ideas as to whag might have happened?

[@cmetube]

Nice video. Simple fix. What kind of solder sucker is that?

[@nielsgrote]

I have the rx-300 on my desk. one channel is dead. hope i can make it alive ;-) thanks for your great videos ! ! !

[@Maxxarcade]

@poopooGarret Ya, I was surprised that it had a cutoff relay, considering it's only 15 watts per channel or so. If you want to toast some speakers you need a ratty PA amp with about 100W or so. Normally I try to sell old speakers that I can't use, but I have a pair that are genuine crap that came out of some old Realistic boxes. I'm gonna rebuild them with new speakers since the boxes are really sturdy, and the old woofers are gonna get "stress tested" some day LOL.

[@FritoFredrik]

i have an RX-300 and the input selector on mine is a bit lose

[@RodBeauvex]

Holy freaking cow! You can keep that amp, I want that desoldering gun!

[@andrealemus1589]

i need see number of the parts you welding please tank you

[@maxverstappennonofficial]

I had the same exact problem. Got this receiver from an neighbor that wanted to get rid of it. At first , i didn't tested if the old transistor is still good and got an new , equivalent npn transistor ( TIP41). , And I have soldered it and still doesn't work. Now i am sngry and found this video , and im going to test the old transistor.

[@Krlosgarza3]

Tengo un rx-300u enciende y se apaga. Podrás repararlo

[@jarodgregor6682]

I bought the yamaha rx 300 u over 25 years ago. It was working fine till a month ago when the aux input seemed to produce distorted sound. I am now reconnecting my speakers with new wire to see if this helps. If not, I'll buy a new receiver. 25 years of trouble free use is pretty good anyway.

[@mikkoahvalo2579]

I would be happy If someone could link RX-300 service manual or schematic :)

[@Maxxarcade]

@djbazzmaster I fix arcade games, jukeboxes, pinball machines, and other amusement/vending equipment.

[@bowleggedroosterfourstring5118]

Hey Max I caught a split sec of your new "Hot Powered Solder Sucker!" LOL! I think I seen that its was a Hacko, (Right?) Were did you get the best price at? And do you have any issues with it? Does it get hot enough for something like "replacing power transformers" in a home surround sound receiver? And what kind of vacuum pump does it have? (maybe something along the lines of how the hot air gun blower works?) You know max I just realized something it would be cool to have a hot air soldering gun and a hot solder sucker all in one just by reversing the fan? Cool!

[@Jamafia]

i got a RX-V620 that does samething, power it on just stays for a second and goes off.

[@kimberlyconte23]

i hae ayanaha htr5935 yamaha it turns on ,then it shuts off 3 seconds later

[@Swi2ler]

my laptops charger port is not working. after seeing this i think the solder joint has been broken

[@DavidBerquist334]

I got one at a yard sale five bucks in the book unopened works great I'm in Syracuse NY if I ever need it fixed who can do it

[@Maxxarcade]

@costellom5 Well, people always tell me they want more details :-)

[@GarretClaridgeMeerkat]

@Maxxarcade lol actually I do have a big PA amp, I can hardly lift the thing (duel mono block peavy 1200 watts) it even fries the 500 watt tweeters in my giant DJ cabinets from time to time XD as for selling I cant stand dealing with people and am epic lazy so as you most likely know i just blow the crap up, then make my money on the youtube adsense thing instead I do however still love audio and rarely kill anything worth wile... speaking of witch i have a broken marantz unit if you want it

[@URM4Z]

Very nice video , all clear and nice and easy. Keep up the good work :) I willl definilty subscribe:) for mor!

[@Maxxarcade]

@Machinia I hate most new stuff anyway, it so cheap!

[@Maxxarcade]

@fordbroncodave Michigan.

[@MrTopsoil911]

Rule of thumb never shake heatsink u r lossening its brackets and causing more problems.

[@biukucanoe]

wow, this is a hobby???

[@joaokopps]

Hi! Please, do you would send to me the electric scheme? If Yes, find me in Facebook, joao kopps. Thank you.

[@floyd617]

hi, no sorry i didn't end up finding the cause of the problem so i ended up throwing out the system. it was very old anyways. sorry

[@mdzacharias]

Great Job! I'm an authorized servicer for Yamaha and several other brands, if you are interested in corresponding. I have some "repair briefs" posted as mdzacharias and "The Multimeter Junkie"

[@MrTopsoil911]

Me i would charge $40!!! As im a certified tech.