Always check HEAT of boards and components. FLIR type imager is essential! I have had many, many components cooking themselves to death, but DMM shows correct voltages , Kill-a-Watt shows normal power draw (with in specs) and fuses totally unaffected.
Beautiful electronics those marantz. I'm still using today (year 2024) my model 1072 in complete original parts but fuses, replaced with the same values and gimbals in place of the steel strip of the input selector. Great amplifier! ❤ Personally, i would have also replaced the other resistor (to have optimal symmetry). In any case, great work!
Good to see step by step process of fault finding. Sometimes when a schematic is not easy to get and one channel appears working we used it as a reference point. Good video all the same
Un vídeo perfectamente explicado y visualizado. Muchas gracias por el tiempo dedicado y por subirlo. Tengo el mismo amplificador, el Marantz 1090, pero con el panel en negro. El canal derecho distorsiona tras cambiar los transistores de potencia en corto. Seguiré tus pasos para dar con la solución. 👍
Great repair video Joe. Marantz made good quality, reasonably priced gear back in the day. The serviceability is also excellent. They only sell high-end gear today.
It's amazing, how one resistor could disable a fine piece of audio equipment. You probably saved this one from the landfill! I enjoy your approach to troubleshooting, thanks for the video! A quick story, while I was a senior tech in the nineties, a trainee I was assisting spent a whole morning troubleshooting an op amp circuit. He had a problem with his circuit with reversed polarity, I glanced down, and noticed he had his meter leads reversed..........We all have done it...........
Thanks for the video I like watching you trouble shoot. I've just started into repairing and refurbishing my own stereo equipment so It would be extremely helpful to me if you would show how you hook up your test equipment when your running your tests and checks. I've already recapped my amp and receiver. Thanks
Grazie Joe mi ciamo Alessio sono Italiano un gran bel video completo come non ho mai visto grazie a te ho resuscitato il mio Marantz1090 come solito rumoroso con tanti problemi diversi per ora mi accontento ma ti chiadero altre piccole cose al riguardo grazie ancora ciao da Italia
Very well done. Your methods are meticulously executed with excellent descriptions. Also appreciate how meticulously clean and organized your lab is. Looking forward to your next TH-cam video. Thanks so much.
@@VintageAudioFever Hello Joe, over the past year I've dipped into the vintage stereo addiction. I purchased a Kenwood KR 7400 and used it for a couple of months before I was deployed and had to be away from the states while my belongings sat all summers long in an un-air conditioned apartment for about three months here in steamy Florida. When I returned, I noticed there is some scratchiness as I adjust the volume up and down - it's only merely a nuisance, but I feel as though it's not transmitting the same volume power to the speakers as it was before. Is this something I'm merely imagining, or is this something that happens in conjunction with the scratchy controls? Thanks.
Nice ! I think the defining moment for that 470Ω was when you measured one way it was open then measured the other way and got junk what you saw there was the diode in parallel with it ! so off with its head.....cheers.
Well done, that is a nice looking, Marantz. Your fault finding technical skills are very find tuned. The wave forms on the scope at max power were wicked clean. Look forward to the next video.
Great video Joe! I'm new at this hobby. Learned alot from your trouble shooting skills. Just curious what caps you used to replace the orange caps. I think they were Elna caps. Been to Audiokarma many times learning from everyone there and there are so many different opinios on what to use for cap replacements for the orange caps. Would love to know what you use. Thanks again !!
Nice job! Two Q’s: who makes those long mini grabbers that you use? Also wasn’t that electrosolve that you cleaned the pots with? (No residue/ lube) maybe I didn’t see it clearly.
Hey Joe great video, nice work on that Marantz. Can you share with me how and where you get your schematics. I need one for my Marantz 2385, can't seem to find one, Thanks if you can help.
Nice video! What's the difference in sound after replacing defective caps like that? I understand that for this specific case with bad issues you cannot compare the sound before and after, but what's your general experience? For information: I own two 1072s that sound quite muffled, significant loss of treble frequencies.
Hey!! Losing some sound as your mention...capacitors would be the first thing I would check and in your scenario your treble/bass are on your preamp section, so their is a good chance, you have dryed up/ leaky capacitors. let us know your finding could be interesting... thanks for your input... J
Hey Joe, good stuff! I’m a newby for the most part. I just found you and subscribed. I’ve been watching the other hood channels for a while now but this is the first time you popped up. Do you have experience with car amps? I guess amps are amps for the most part. It’s a JL Audio 6 channel class AB I believe. It has a KIA494AF. I replaced a few IRF540’s but both channels have a buzz. I’m trying to find it with the scope. My question is should both rails have equal or at least close to equal voltages? Maybe a stupid question but this is only my 5th repair and I don’t have the others anymore for reference. I have +20.80 and -15.90. Thanks in advance if you answer and I’m gonna go back and check out the rest of your videos. Nobody does 90’s amps that I can find anyway
Even without the schematics you can troubleshoot, just check all Vbe of all transistors, with good transistor u should get 0.5v to 0.7v, now check all outputs transistors emitter resistor voltage you should get all the same with left channel. Now you may use also your oscilloscope, inject 1khz to the amp input, then check any sinewave distortion on every base of each transistor, you may start at power amp input transistor. 😀
@@VintageAudioFever good to know. I wear them occasionally but only when I'm dealing with chemicals. I'm not a fan of the feel but I'm just not used to wearing them like you are in your day job.
Is it the right channel ? What channel ? Please tell us what channel ? Not sure what "RIGHT" means. What does channel mean ? I be not know whutt channel. Are you sure it's the right channel ? Does the right channel smell differently from the left channel ?
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Excellent diagnostic procedure.most interesting repair
Mak
Pak
Always check HEAT of boards and components. FLIR type imager is essential! I have had many, many components cooking themselves to death, but DMM shows correct voltages , Kill-a-Watt shows normal power draw (with in specs) and fuses totally unaffected.
Beautiful electronics those marantz. I'm still using today (year 2024) my model 1072 in complete original parts but fuses, replaced with the same values and gimbals in place of the steel strip of the input selector. Great amplifier! ❤ Personally, i would have also replaced the other resistor (to have optimal symmetry). In any case, great work!
Good to see step by step process of fault finding. Sometimes when a schematic is not easy to get and one channel appears working we used it as a reference point.
Good video all the same
Un vídeo perfectamente explicado y visualizado. Muchas gracias por el tiempo dedicado y por subirlo.
Tengo el mismo amplificador, el Marantz 1090, pero con el panel en negro. El canal derecho distorsiona tras cambiar los transistores de potencia en corto. Seguiré tus pasos para dar con la solución. 👍
Great repair video Joe. Marantz made good quality, reasonably priced gear back in the day. The serviceability is also excellent. They only sell high-end gear today.
It's amazing, how one resistor could disable a fine piece of audio equipment. You probably saved this one from the landfill!
I enjoy your approach to troubleshooting, thanks for the video! A quick story, while I was a senior tech in the nineties, a trainee I was assisting spent a whole morning troubleshooting an op amp circuit. He had a problem with his circuit with reversed polarity, I glanced down, and noticed he had his meter leads reversed..........We all have done it...........
Hi, I've been in electronics for many years, I questioned your methods at first but you have impressed me with your expertise.
good video Rich
Good process my guy, easy to follow along
Could you do a bit on your dim bulb at some point?
Thanks for the video I like watching you trouble shoot. I've just started into repairing and refurbishing my own stereo equipment so It would be extremely helpful to me if you would show how you hook up your test equipment when your running your tests and checks. I've already recapped my amp and receiver.
Thanks
Nice job on a really pretty amp. In a medium room with the right speakers that's a beautiful set ! Nice troubleshooting Joe !
Grazie Joe mi ciamo Alessio sono Italiano un gran bel video completo come non ho mai visto grazie a te ho resuscitato il mio Marantz1090 come solito rumoroso con tanti problemi diversi per ora mi accontento ma ti chiadero altre piccole cose al riguardo grazie ancora ciao da Italia
Very well done. Your methods are meticulously executed with excellent descriptions. Also appreciate how meticulously clean and organized your lab is.
Looking forward to your next TH-cam video. Thanks so much.
ah ...your comment was a breath of fresh air,,, thank You!!
@@VintageAudioFever Hello Joe, over the past year I've dipped into the vintage stereo addiction. I purchased a Kenwood KR 7400 and used it for a couple of months before I was deployed and had to be away from the states while my belongings sat all summers long in an un-air conditioned apartment for about three months here in steamy Florida. When I returned, I noticed there is some scratchiness as I adjust the volume up and down - it's only merely a nuisance, but I feel as though it's not transmitting the same volume power to the speakers as it was before. Is this something I'm merely imagining, or is this something that happens in conjunction with the scratchy controls? Thanks.
First view on your channel and very impressed ! you gain a new suscriber ! from France!
Welcome aboard! Bienvenue a bord!!!
👏👏👏 I dig your channel, clear and concise diags and repairs. Camera work and audio great. Bonus points for having a clean bench :)
I appreciate that comment! thank you!
Good work and detailed work through the circuit.👍
Glad you liked it!
Great vid! I think it was a great finale, hearing music out of the restored amplifier! Keep up the great work!
Good job Joe.....another happy piece of vintage gear.
Thanks 👍 Tim....can always count on you for support buddy!!
Very professional work sir. God bless you. I love marantz sound so sweet sound
Excellent video, liked your methodical approach and helpful advice, thank you
Glad it was helpful!
The only extra thing I might have done is change spring clip speaker posts to banana plugs. Great video. Thank you.
Nice ! I think the defining moment for that 470Ω was when you measured one way it was open then measured the other way and got junk what you saw there was the diode in parallel with it ! so off with its head.....cheers.
Well done, that is a nice looking, Marantz. Your fault finding technical skills are very find tuned. The wave forms on the scope at max power were wicked clean. Look forward to the next video.
Excellent trouble shooting video. I always replace all electrolytic caps for my own gear. But customers may not want to pay for it.
Great video Joe! I'm new at this hobby. Learned alot from your trouble shooting skills. Just curious what caps you used to replace the orange caps. I think they were Elna caps. Been to Audiokarma many times learning from everyone there and there are so many different opinios on what to use for cap replacements for the orange caps. Would love to know what you use. Thanks again !!
Nice job! Two Q’s: who makes those long mini grabbers that you use? Also wasn’t that electrosolve that you cleaned the pots with? (No residue/ lube) maybe I didn’t see it clearly.
Hey Joe great video, nice work on that Marantz. Can you share with me how and where you get your schematics. I need one for my Marantz 2385, can't seem to find one, Thanks if you can help.
archive.org/details/manual_2385_MARANTZ
Hey Joe, nice work. Those orange caps are low-leakage/low-noise. Best replacement is Nichicon UKL series.
... and once they fail, they go out in style, loss of capacitance, esr in tens of ohms and leaking like a colander.
Nice video! What's the difference in sound after replacing defective caps like that? I understand that for this specific case with bad issues you cannot compare the sound before and after, but what's your general experience? For information: I own two 1072s that sound quite muffled, significant loss of treble frequencies.
Hey!!
Losing some sound as your mention...capacitors would be the first thing I would check and in your scenario your treble/bass are on your preamp section, so their is a good chance, you have dryed up/ leaky capacitors. let us know your finding could be interesting...
thanks for your input...
J
Great job. [thumb up here]
Nice! Another Marantz rescued from the E-waste
Thanks Trevors!!
Restoration. Calibration. Through trouble shooting. How much it was charged?? 😮
Hey Joe, good stuff! I’m a newby for the most part. I just found you and subscribed. I’ve been watching the other hood channels for a while now but this is the first time you popped up. Do you have experience with car amps? I guess amps are amps for the most part. It’s a JL Audio 6 channel class AB I believe. It has a KIA494AF. I replaced a few IRF540’s but both channels have a buzz. I’m trying to find it with the scope. My question is should both rails have equal or at least close to equal voltages? Maybe a stupid question but this is only my 5th repair and I don’t have the others anymore for reference. I have +20.80 and -15.90. Thanks in advance if you answer and I’m gonna go back and check out the rest of your videos. Nobody does 90’s amps that I can find anyway
Merci, very well explain! Thanks.
Hi 👋🏼😊 new subscriber. I really enjoyed watching your video. I’m also love repairing/fixing my own stuff. Great work 👍🏼 enjoy the music 🎶👽✌🏼✨🛸
Thanks for the sub!
Hi Joe ,very nice Marantz amp .great video
Even without the schematics you can troubleshoot, just check all Vbe of all transistors, with good transistor u should get 0.5v to 0.7v, now check all outputs transistors emitter resistor voltage you should get all the same with left channel. Now you may use also your oscilloscope, inject 1khz to the amp input, then check any sinewave distortion on every base of each transistor, you may start at power amp input transistor. 😀
Excellent advise.thank you
Mack
Pakistan
Job well don,sir.....
Connecting a signal to the input and using an oscillocope would get faster results.
Excelente canal me Suscribo!❤
Thanks for another great video.
Nice vid . Tyvm . Well done
Glad you enjoyed it
Good job, nice video
Good job guy !
What’s with the gloves? Are you just wearing them as an added layer of insulation?
Hey....I do like the felling of wearing gloves...I guess I'm use to wear them as I'm a paramedic full-time...it's maybe just mind set...haha
@@VintageAudioFever good to know. I wear them occasionally but only when I'm dealing with chemicals. I'm not a fan of the feel but I'm just not used to wearing them like you are in your day job.
❤❤❤❤🎉
I was going to lose my mind if you said right channel one more time
you should watch minute Mark for his decorum on each repair
By the way...I think you might have an issue with the right channel. 😂
you r a bit slow : ) but thanks for the video .
Where are you located?
I have 4300 needs work done on it
Moncton CANADA
Is it the right channel ? What channel ? Please tell us what channel ? Not sure what "RIGHT" means. What does channel mean ? I be not know whutt channel. Are you sure it's the right channel ? Does the right channel smell differently from the left channel ?
Grow up
Someone needs some attention