Hi Mark, You are the man! I found a few solder connections that didn’t look quite right (a very fine concentric fissure-like in the solder) at the pins corresponding to power amp IC501, IC601, IC701. I re-soldered them, and voila! Back in business! I couldn’t reproduce the popping sound. What’s even more interesting, it looks like it now sounds “better”, “fuller, but this can be just an illusion. Thank you very much, your help very appreciated!
I bought the same receiver at a fleemarket with the same problem. I just took care of it with your video. Thank you very much. My reciever is working now. I ca't believe what a 1 ohm resistor can do. wow!!. I'm happy. thanks
Same conditions on my STR-DE835. i had same problem ...R592 and R593 are the resistors . I had one open . Thanks for the posting .. saved me much time . Part ordered from EnCompass .
On the DA7ES if there are no shorted outputs, one of the driver IC's is probably bad. One has to measure the DC at the output of each amp channel after the shutdown, and replace the driver IC which is associated with that channel. On Sony's usually the internal voltages stay put after shutdown so you can measure them.
I think I would inspect the solder connections at the driver IC's and maybe at the voltage regulators. A pop is a shift in DC level. Solder connections at the drivers or at the voltage regulators might account for this. Make sure the main DC voltages are bled off before any soldering.
Mark , it turned out to be sold solder connections on the A/B speaker selector switch, but i resoldered all of the preamp ICs (2581's) because they looked fairly heat stressed, it works great now thanks for the help!
@mdzacharias Real good stuff. All OK on the Stand-By Board except no change @ D816 that I could see. Think it is something at the front or at least down the line from the Stand-By Board. Almost acts like an open thermal cut-out or fuse but can't track it down yet. Thanks again for the input.
Awesome info in the comments here. We have a STR-DE575 and all I get is a relay click from (RY901?) on the standby power board when I press the power switch on the front of the unit. Nothing on display and no further response from any other buttons on the control board. Will be checking some of the things you reccomended to therepairguru but we would love to get this receiver working. Sincerely, EE Undergrad student.
@TheRepairGuru If there is power for the relay I would look at Q802 on the main board, and see if the base gets voltage at turn-on. If not, and the E-B junction is not shorted, start looking at the microprocessor.
@mdzacharias i got the schematic from a friend , while checking volt, i found some voltage didn't add up. IC571 shows a low v 36 and the schematic 58.2v ,that on the transistors also v 36 and middle one dead SB AMP board for now im waiting on parts .oh i didnt know that headphone needs to be attach for relays to be operational .i found it out the hard way lol . keep posting videos i watch them over an over .thanks again
@olvano Ok, I was thinking of a different model. Look at the + and - 7 volt regulators IC 801 and IC 802. If they have no power there will be no sound. If IC 401 is cold I would suspect this. Also you can try using your multimeter on an AC milli-volt range to look for audio. Vary the volume control to see if it changes.. Kind of crude but might help with the troubleshooting. Don't assume IC401 bad yet.
The one I wanna get repaired, It's a STR-GA7ES. Nice 500w receiver, but it goes into protection. I guess I will look at the power supply first, but it does turn on and the relay clicks.
@TheRepairGuru You might avoid having to go to the switch itself. You can measure the DC voltage at D816 near the turn-on relay at the rear corner of the unit. no DC voltage at the anode, you may have a bad standby transformer T902. Fairly common. If you have DC at the anode, look to see if the voltage at the cathode changes when you press the power button. if it only changes a little, you may have a bad relay drive transistor or diode D816 could be bad.
thanks for the relay info,no power .so i guest that it could be the ic under the board i need part number to change it ,that get real hot front panel reads speaker not used .
There are different kinds of buzzing noises, and they're caused by different issues. If it's a big loud throaty buzz, maybe an open filter cap. Smaller buzz, maybe a ground loop and nothing wrong with the receiver itself. You can check for a ground loop by disconnecting all inputs, even the antenna unless it's just a dipole or hanging wire. If the hum goes away, it's a ground loop, probably caused by some physical connection to your computer or cable system.
@olvano The 1.06 sounds like the base - I think you have the base and emitter readings reversed. The voltages I think are OK. Look to see if the speaker relay is being driven. Sometimes the speaker switch on the front panel has bad solder connections...
In this case there was low voltage on the output side of the resistor. In normal operation, 50 milliamps through the 1 ohm resistor, only produces a 50 millivolt drop, so the voltage would normally be nearly the same on both sides.
Hi! Thank you very much for this video. My Sony STR-KM3 (Argentina model) is turning off right after power on, displaying a "USB FAIL" error message, despite the model DOES NOT having any USB connector? (I have once repaired the same model, but with USB. The problem was a faulty relay (RY901)). Any suggestion or hint? Thank you.
I just got one of these from goodwill and it worked so perfect for a couple hours then it popped real loud from the speakers and went into protect. I power cycled and now it has very very low volume coming from the front speakers. The rear work fine but the front are super quiet and lots of static-y interference. I opened it up and it was real dusty and looks like something sticky had been spilled on it a long time ago. Could this problem be caused by some shorting out of the impedance switch? I have no multimeter :( I am also getting a DSP 2 S-RAM ERROR when I start DSP test mode. What gives?
Yes, after plugging in the receiver/amp into the wall, I push the standby/power switch, and it does turn on, the speaker relay clicks and then the display says "Protection".
Thanks I will try an make a response video of my GA7ES. I also have a Panasonic 6 disc cartridge style CD changer that has problems. It won't eject the cartridge sometimes.
@ankingster This would not be a common problem with these. I think I might resolder the uPC2581driver IC's and replace the small electrolytics which sit near them and get overheated. Also I think the speaker switch up front gets bad solder connections near it.
On this Sony, when you found the open resistor what voltage did you get on each end of the open resistor? Was it the same voltage? Is that how you would spot a open when doing voltage tests? Thanks Russ
Not here to defend Sony but their engineering is brilliant. Matter of price point and features. Their higher end ES models can be very difficult to service.
Thanks! I found a total of 6. I found 2 that were burnt out .I had some spare ones (GDC 1.6A Slow-Blow Fuse 250v )..... but i dont think they have enough power. Do you know the specific fuse type they are? I can try and replace all 6 and hope for the best. Kids had volume all the way up. Once i turned it on - the speakers blasted loudly then fizzled out before i could hit mute or turn down. Now i get no sound at all... from any speaker. Everything comes on fine and looks fine... just no sound.
OK... next question... I bought new fuses. and replaced them... Now i can hear the faintest sound of music if i put a speaker right up to my ear.. i can tell the volume does go up and down and if i go all the way up it goes into protector mode... It is the faintest sound though.... At this point i am at a loss and may have to try and find another used one - unless you have some ideas of basic things to look for or check... Any help is again appreciated.
Cool video. i have the similar receiver. & the problem is that i have 2 channels giving very quiet sound compare to others. front R & surr L. I heard that can be caused by blown transistors, is that right & how hard it is to get the right components for it?
@mdzacharias DC offset at speaker terminals is 0 on 200mV meter,but I do not know what is the white emitter resistor you referred to. I see 5 big white components that read MPC725 [main section wiring board R576, R626, R526 etc], is that what I should measure? I am not a tech, but I can measure and solder.Thanks again for your time,I really appreciate it.
@kellytran1824 If there is no DC voltage at the collectors with respect to ground, either the main fuses are bad, usually because of bad output transistors, or the main power transformer is bad (pretty unusual, and the display would never come on in that case)
Thanks for showing me this, but the thing is with my receiver I do get sound, but only from the 5.1CH Input, I used to be able to get sound from that AND the CD input, but not anymore, any help would be great. Thanks!
I have a Sony Str-DA945 receiver which generates a loud popping sound on the speakers, only when I turn it on, especially when the receiver is cold. The sound is generated even when the receiver is on an input with no signal. Sometimes the popping sound is very loud and the receiver goes in protection. Do you have any idea where to look? Maybe a capacitor at the power section? I am not a technician but I am able to do some soldering if needed, not on SMDs though.
@durox Does the display come on? If so the 4.7 volts is probably not a problem. BTW are you measuring that at pin 4 of CNP801? If it was going into protect before and not now, just with no sound, then fuses F801 and F802 may be bad. THIS INDICATES A BLOWN AMP CHANNEL. IF you replace the fuses they'll probably blow again. If the fuses are OK then you need to measure DC offset w/ respect to ground at each white emitter resistor. Let me know what you find. Are you a tech or able to solder etc?
The fuse rating should be engraved on the fuse itself. Just replace with same type 5 amp or whatever. Your 1.6 amp fuses are probably not enough for this circuit. Generally the fuse rating is also printed on the board near the fuse holder.
Hi Multimeter Junkie..Ive got a STR-DE475 that doesnt lock onto any AM or FM stations. I am searching the web for a fix for this unit. Any pointers ID appreciate greatly. I`m trying to fix this myself as the cost of repair would`nt be worthwhile. Cheers and Thanks in advance.
Hi Mark great video very well done - I also have a Strde635 and mine has an intermittent problem, occasionally when i turn it on I get no sound at all but when i shut it off and turn it right back on one or twice the sound returns, also occasionaly when it has been on a while it will shut off and turn itself bqck on in rabid succession because i can hear the relays- I am thinking it has a cold solder connection somewhere becuase i always get the second relay click even when i get no sound, I am useing the optical input only on this receiver for a source that also could be relavant? Any suggestions are appreciated thanks
i guess that has to do with the pins at the muting board.. mine has same prob trying to work on it. if I play around and press front cover it clicks then works.
@CompCrasher86 Hi! Check the main power transformer primary, the DC fuses on the PT secondary side, and check the power transistors resistance from emitter to collector. Let me know what you find. Do you have the service manual? I can probably get you a PDF.
hi mmj;browsing the web for some clues i found your video,so i'll try my luck here:my srt-de635 has no sound and the muting led is flasing on power-on and also each time i press a button -even speaker selector.the receiver was working -radio, and it turned off itself twice.i turned it back on:a few times it tunerd on w/ no sound as i could hear only one 'click' and not the second that clicks right before the sound would come on.all the fuses are ok and on 'DC board cnp801' I get 4.7V.any advice?
Hay MMJ have a real nice Sony STR-DE325 that is totally dead (fuse @ transformer ok). Just downloaded the manual but was wondering if you had any advice on how to follow voltage to POWER switch. Thank you any help Sir.
@mdzacharias i have a Sony STR de 597 ,no sound ,ice cold when powered but it come's on .you ever work in this model before.Im would to get some troubleshoot info , voltage probing is not helping me much .
Hello Sir! I repaired the buttons. The problem not a ladder, i checking the resistors, and all is correct value. I changing some buttons to a new, and working fine. But need a some repairing instructions to solving the FM problem. I find a matsusita tuner in the amplifier. please help
I got a question . Do you have access to Magnavox console stereo Schematics . I need one for a 1965 console . I was wondering if you have a site I could download one for free . Sams have it but its 22.00 for a download for it .
I'm not finding this model number. The radio problem sounds like a discriminator adjustment problem. The function changing could be having to do with the resistive ladder arrangement of the front panel circuit board. Takes some knowledge to troubleshoot...
Hello Sir. Please help me . I have Sony str-dx250 amp. the amp working fine, except some functions. The radio not find stations, but , when I type manually the frekvency, then working. The buttons : when I press a cd button, then select a line in. Randomly changing , but its error is rarely. About: crazy the buttons. What is the problem? Where to find a solution? Thank you your reply. Kind regards Istvan from hungary. Excuse me for my bad english.
@toolhackerdotcom Hi, I get them from Sony. I'm an authorized servicer for Sony and others but there's lots of other sources. A good one is eserviceinfoDOTcom, also the hifi engine has some.
@@mdzacharias my STR-DE625 has the same problem, no sound on the headphones or speaker sounds. The transistor has power on the middle prong but dead on the base. This is only on the left transistor bank as the right has nothing on any prong. I believe the resistors I need to replace are Roo1 and R051 is this correct?
@@GaryAshleycrashsmashley I don't think you're quite on the right track. R592 R593 would be the same as in this video, but would affect BOTH channels. Maybe check the 180 ohm resistors R524 R525 or similar resistors on the other channels.
hello..sir....i watch your video on how to repair sony amplifier....sir,,please help me also on my sony str-de835 receiver..the problem is no output sound on all channel...please healp me soon...thankz.
i just got one for 1 dollar...i love it for the value...mine is the power button is a little faulty but thats a easy fix..call getting a remote LOL...LOLOL
Way oversimplified. I'm so tired of hearing about caps all the time. Anyone who repairs stuff for a living is grateful for a cap job because they are easy money, but it's troubleshooting that separates the men from the boys.
thank you mark Im glad I found your channel. I appreciate and honor your work
Hi Mark,
You are the man! I found a few solder connections that didn’t look quite right (a very fine concentric fissure-like in the solder) at the pins corresponding to power amp IC501, IC601, IC701. I re-soldered them, and voila! Back in business! I couldn’t reproduce the popping sound. What’s even more interesting, it looks like it now sounds “better”, “fuller, but this can be just an illusion.
Thank you very much, your help very appreciated!
I bought the same receiver at a fleemarket with the same problem. I just took care of it with your video. Thank you very much. My reciever is working now. I ca't believe what a 1 ohm resistor can do. wow!!. I'm happy. thanks
Same conditions on my STR-DE835. i had same problem ...R592 and R593 are the resistors . I had one open .
Thanks for the posting .. saved me much time . Part ordered from EnCompass .
On the DA7ES if there are no shorted outputs, one of the driver IC's is probably bad. One has to measure the DC at the output of each amp channel after the shutdown, and replace the driver IC which is associated with that channel. On Sony's usually the internal voltages stay put after shutdown so you can measure them.
I think I would inspect the solder connections at the driver IC's and maybe at the voltage regulators. A pop is a shift in DC level. Solder connections at the drivers or at the voltage regulators might account for this. Make sure the main DC voltages are bled off before any soldering.
Thanks for taking the time to respond. I will check that. It will take some time though, but I will keep you posted even if it will take a while.
Mark , it turned out to be sold solder connections on the A/B speaker selector switch, but i resoldered all of the preamp ICs (2581's) because they looked fairly heat stressed, it works great now thanks for the help!
Kinnon Humphrey I'd forgotten this was one of those with the switch issues - great job!
@mdzacharias Real good stuff. All OK on the Stand-By Board except no change @ D816 that I could see. Think it is something at the front or at least down the line from the Stand-By Board. Almost acts like an open thermal cut-out or fuse but can't track it down yet. Thanks again for the input.
Awesome info in the comments here. We have a STR-DE575 and all I get is a relay click from (RY901?) on the standby power board when I press the power switch on the front of the unit. Nothing on display and no further response from any other buttons on the control board. Will be checking some of the things you reccomended to therepairguru but we would love to get this receiver working. Sincerely, EE Undergrad student.
@TheRepairGuru If there is power for the relay I would look at Q802 on the main board, and see if the base gets voltage at turn-on. If not, and the E-B junction is not shorted, start looking at the microprocessor.
By the way - thanks for the help! Got it back up and running! =)
On the 635 the fuses are located on the board with the standby transformer, and on the board with the big filter capacitors.
@mdzacharias i got the schematic from a friend , while checking volt, i found some voltage didn't add up. IC571 shows a low v 36 and the schematic 58.2v ,that on the transistors also v 36 and middle one dead SB AMP board for now im waiting on parts .oh i didnt know that headphone needs to be attach for relays to be operational .i found it out the hard way lol . keep posting videos i watch them over an over .thanks again
@olvano Ok, I was thinking of a different model. Look at the + and - 7 volt regulators IC 801 and IC 802. If they have no power there will be no sound. If IC 401 is cold I would suspect this. Also you can try using your multimeter on an AC milli-volt range to look for audio. Vary the volume control to see if it changes.. Kind of crude but might help with the troubleshooting. Don't assume IC401 bad yet.
The one I wanna get repaired, It's a STR-GA7ES. Nice 500w receiver, but it goes into protection. I guess I will look at the power supply first, but it does turn on and the relay clicks.
mine gos to protection how do you get it to stop and work again ?
Thanks! That means a lot.
@TheRepairGuru You might avoid having to go to the switch itself. You can measure the DC voltage at D816 near the turn-on relay at the rear corner of the unit. no DC voltage at the anode, you may have a bad standby transformer T902. Fairly common. If you have DC at the anode, look to see if the voltage at the cathode changes when you press the power button. if it only changes a little, you may have a bad relay drive transistor or diode D816 could be bad.
thanks for the relay info,no power .so i guest that it could be the ic under the board i need part number to change it ,that get real hot front panel reads speaker not used .
There are different kinds of buzzing noises, and they're caused by different issues. If it's a big loud throaty buzz, maybe an open filter cap. Smaller buzz, maybe a ground loop and nothing wrong with the receiver itself. You can check for a ground loop by disconnecting all inputs, even the antenna unless it's just a dipole or hanging wire. If the hum goes away, it's a ground loop, probably caused by some physical connection to your computer or cable system.
@olvano The 1.06 sounds like the base - I think you have the base and emitter readings reversed. The voltages I think are OK. Look to see if the speaker relay is being driven. Sometimes the speaker switch on the front panel has bad solder connections...
@olvano Check the solder connections at the front panel near the speaker switch. Common problem.
In this case there was low voltage on the output side of the resistor. In normal operation, 50 milliamps through the 1 ohm resistor, only produces a 50 millivolt drop, so the voltage would normally be nearly the same on both sides.
Hi! Thank you very much for this video.
My Sony STR-KM3 (Argentina model) is turning off right after power on, displaying a "USB FAIL" error message, despite the model DOES NOT having any USB connector?
(I have once repaired the same model, but with USB. The problem was a faulty relay (RY901)).
Any suggestion or hint?
Thank you.
I just got one of these from goodwill and it worked so perfect for a couple hours then it popped real loud from the speakers and went into protect. I power cycled and now it has very very low volume coming from the front speakers. The rear work fine but the front are super quiet and lots of static-y interference. I opened it up and it was real dusty and looks like something sticky had been spilled on it a long time ago. Could this problem be caused by some shorting out of the impedance switch? I have no multimeter :( I am also getting a DSP 2 S-RAM ERROR when I start DSP test mode. What gives?
Yes, after plugging in the receiver/amp into the wall, I push the standby/power switch, and it does turn on, the speaker relay clicks and then the display says "Protection".
Thanks I will try an make a response video of my GA7ES. I also have a Panasonic 6 disc cartridge style CD changer that has problems. It won't eject the cartridge sometimes.
@ankingster This would not be a common problem with these. I think I might resolder the uPC2581driver IC's and replace the small electrolytics which sit near them and get overheated. Also I think the speaker switch up front gets bad solder connections near it.
On this Sony, when you found the open resistor what voltage did you get on each end of the open resistor? Was it the same voltage? Is that how you would spot a open when doing voltage tests?
Thanks
Russ
@tuberlook1 Hi, I have a tripod and use it sometimes. This was just a quickie - sorry the technical standard was lacking.
Thanks again!
Not here to defend Sony but their engineering is brilliant. Matter of price point and features. Their higher end ES models can be very difficult to service.
Thanks! I found a total of 6. I found 2 that were burnt out .I had some spare ones (GDC 1.6A Slow-Blow Fuse 250v )..... but i dont think they have enough power.
Do you know the specific fuse type they are? I can try and replace all 6 and hope for the best.
Kids had volume all the way up. Once i turned it on - the speakers blasted loudly then fizzled out before i could hit mute or turn down. Now i get no sound at all... from any speaker. Everything comes on fine and looks fine... just no sound.
OK... next question... I bought new fuses. and replaced them... Now i can hear the faintest sound of music if i put a speaker right up to my ear.. i can tell the volume does go up and down and if i go all the way up it goes into protector mode... It is the faintest sound though.... At this point i am at a loss and may have to try and find another used one - unless you have some ideas of basic things to look for or check... Any help is again appreciated.
@olvano Do you have any voltage on the bases of the output transistors?
@durox (I don't suppose the muting is simply turned on?) Yeah those are the emitter resistors.
The display comes on. Yes, I'm somewhat of a technical person. The relay clicks when it comes on, but unsure whether it stays on or not.
Cool video. i have the similar receiver. & the problem is that i have 2 channels giving very quiet sound compare to others. front R & surr L. I heard that can be caused by blown transistors, is that right & how hard it is to get the right components for it?
@mdzacharias DC offset at speaker terminals is 0 on 200mV meter,but I do not know what is the white emitter resistor you referred to. I see 5 big white components that read MPC725 [main section wiring board R576, R626, R526 etc], is that what I should measure?
I am not a tech, but I can measure and solder.Thanks again for your time,I really appreciate it.
@kellytran1824 If there is no DC voltage at the collectors with respect to ground, either the main fuses are bad, usually because of bad output transistors, or the main power transformer is bad (pretty unusual, and the display would never come on in that case)
Thanks for showing me this, but the thing is with my receiver I do get sound, but only from the 5.1CH Input, I used to be able to get sound from that AND the CD input, but not anymore, any help would be great. Thanks!
Maybe no power to the dsp board...
I have a Sony Str-DA945 receiver which generates a loud popping sound on the speakers, only when I turn it on, especially when the receiver is cold. The sound is generated even when the receiver is on an input with no signal. Sometimes the popping sound is very loud and the receiver goes in protection. Do you have any idea where to look? Maybe a capacitor at the power section? I am not a technician but I am able to do some soldering if needed, not on SMDs though.
@durox Does the display come on? If so the 4.7 volts is probably not a problem. BTW are you measuring that at pin 4 of CNP801? If it was going into protect before and not now, just with no sound, then fuses F801 and F802 may be bad. THIS INDICATES A BLOWN AMP CHANNEL. IF you replace the fuses they'll probably blow again. If the fuses are OK then you need to measure DC offset w/ respect to ground at each white emitter resistor. Let me know what you find. Are you a tech or able to solder etc?
The fuse rating should be engraved on the fuse itself. Just replace with same type 5 amp or whatever. Your 1.6 amp fuses are probably not enough for this circuit. Generally the fuse rating is also printed on the board near the fuse holder.
I'm not clear. The power clicks and comes on. Does the speaker relay(s) comes on after that? Does the receiver shut back off by itself?
I have a question, I don't have any voltages on output Collector. The 1ohm resistors seem to be just fine. No short or anything like that. Any ideas?
where would the basic fuses be located at? Would like to try and replace them first.
Hi Multimeter Junkie..Ive got a STR-DE475 that doesnt lock onto any AM or FM stations. I am searching the web for a fix for this unit. Any pointers ID appreciate greatly. I`m trying to fix this myself as the cost of repair would`nt be worthwhile. Cheers and Thanks in advance.
Hi Mark great video very well done - I also have a Strde635 and mine has an intermittent problem, occasionally when i turn it on I get no sound at all but when i shut it off and turn it right back on one or twice the sound returns, also occasionaly when it has been on a while it will shut off and turn itself bqck on in rabid succession because i can hear the relays- I am thinking it has a cold solder connection somewhere becuase i always get the second relay click even when i get no sound, I am useing the optical input only on this receiver for a source that also could be relavant? Any suggestions are appreciated thanks
Kinnon Humphrey I'd look first at the solder connections on the driver IC's and fixed voltage regulators.
i guess that has to do with the pins at the muting board.. mine has same prob trying to work on it. if I play around and press front cover it clicks then works.
@CompCrasher86 Hi! Check the main power transformer primary, the DC fuses on the PT secondary side, and check the power transistors resistance from emitter to collector. Let me know what you find. Do you have the service manual? I can probably get you a PDF.
I haven't tried it lately so, don't remember if it shuts the power back off it or not.
hi mmj;browsing the web for some clues i found your video,so i'll try my luck here:my srt-de635 has no sound and the muting led is flasing on power-on and also each time i press a button -even speaker selector.the receiver was working -radio, and it turned off itself twice.i turned it back on:a few times it tunerd on w/ no sound as i could hear only one 'click' and not the second that clicks right before the sound would come on.all the fuses are ok and on 'DC board cnp801' I get 4.7V.any advice?
Tengo el mismo se me protegio
Hay MMJ have a real nice Sony STR-DE325 that is totally dead (fuse @ transformer ok). Just downloaded the manual but was wondering if you had any advice on how to follow voltage to POWER switch. Thank you any help Sir.
speaker relays working, but no sound. I turned them on and off . do known the Ic for this model?str-de597 its under the circuit circuit board
@mdzacharias only the center has 50 volts ,no readings on the other two .
I have the same model, but I have a problem with display.
well it got the job done and in a fraction of the time, everyone knows the caps are 99% to blame for failures.
@mdzacharias i have a Sony STR de 597 ,no sound ,ice cold when powered but it come's on .you ever work in this model before.Im would to get some troubleshoot info , voltage probing is not helping me much .
@mdzacharias sorry 0 on the bases ,E 1.06 v, C 51.45. How do i find the short components ?
Hello Sir! I repaired the buttons. The problem not a ladder, i checking the resistors, and all is correct value. I changing some buttons to a new, and working fine. But need a some repairing instructions to solving the FM problem. I find a matsusita tuner in the amplifier. please help
I got a question . Do you have access to Magnavox console stereo Schematics . I need one for a 1965 console . I was wondering if you have a site I could download one for free . Sams have it but its 22.00 for a download for it .
I have a STR-DE445 that makes a buzzing noise in speakers is this normal
Can u say any solution for push power protect error????plzz
Does it stay on or click back off? Does the front display ever come on? Are you a technical person?
Denis - What kind of problem?
@mdzacharias you're funny too not just helpful ;]]
thanks for your time, take care and keep it up!
I'm not finding this model number. The radio problem sounds like a discriminator adjustment problem. The function changing could be having to do with the resistive ladder arrangement of the front panel circuit board. Takes some knowledge to troubleshoot...
Hello Sir. Please help me . I have Sony str-dx250 amp. the amp working fine, except some functions. The radio not find stations, but , when I type manually the frekvency, then working. The buttons : when I press a cd button, then select a line in. Randomly changing , but its error is rarely. About: crazy the buttons. What is the problem? Where to find a solution? Thank you your reply. Kind regards Istvan from hungary. Excuse me for my bad english.
@mdzacharias thanks in advance for your time!
very difficult to write all the things one wants in 500 characters ;]
@toolhackerdotcom Hi, I get them from Sony. I'm an authorized servicer for Sony and others but there's lots of other sources. A good one is eserviceinfoDOTcom, also the hifi engine has some.
Do you repair VCR’s too?
Well, not anymore...
@@mdzacharias pretty cool that you did in the past though
Several of my Sony's went into Protection. How does one repair that?
yes how? i have the same problem
in replacing the resistors does it matter what watt the one ohm resistor is?
In the case of this receiver anything more than 1/4 watt is overkill.
@@mdzacharias Thank you
@@mdzacharias my STR-DE625 has the same problem, no sound on the headphones or speaker sounds. The transistor has power on the middle prong but dead on the base. This is only on the left transistor bank as the right has nothing on any prong. I believe the resistors I need to replace are Roo1 and R051 is this correct?
@@GaryAshleycrashsmashley I don't think you're quite on the right track. R592 R593 would be the same as in this video, but would affect BOTH channels. Maybe check the 180 ohm resistors R524 R525 or similar resistors on the other channels.
I typing wrong model number. the correct is here:Sony Str-gx250.
I have the same receiver but mine come on for about 5 minutes then the sound goes off any ideas?
Perhaps solder connections at one or more voltage regulator IC's?
Would you repair mine if I send it to you? If so, please message me so we could work out the details. Thanks
My shop is closing in the very near future. At this time I am not accepting any mail-in repairs. Sorry...
hello..sir....i watch your video on how to repair sony amplifier....sir,,please help me also on my sony str-de835 receiver..the problem is no output sound on all channel...please healp me soon...thankz.
Sir' I am Sherin Puzhakkal. I am from India. I want Buy New A/V Receiver. Which Company Best A/V Receiver
In my opinion - Yamaha is the best without question.
mark он сейчас у тебя работает?
I only speak English.
Way too general question. Some have blown amp channels, some have bad driver IC's, some have power supply problems.
Im Again. I find the tuner correct type:Mitsumi FAE201-A.
i just got one for 1 dollar...i love it for the value...mine is the power button is a little faulty but thats a easy fix..call getting a remote LOL...LOLOL
i have problem in sony amp if you help fix it i pay you
Sorry, I have no access to such old USA product.
Are you kidding? How about, "I'm sick. What's wrong with me?"
I accept Paypal !
:-)
I accept Paypal :-)
@ztech333 I accept Paypal :-)
sony stopped making good amplifiers in 1988 from there on theyre rubbish.
If you have no technical ability there is not much I can do. Are you a technician or have you any technical qualifications, or just a cheapskate?
Way oversimplified. I'm so tired of hearing about caps all the time. Anyone who repairs stuff for a living is grateful for a cap job because they are easy money, but it's troubleshooting that separates the men from the boys.