it's almost a crime that this was relegated to a storage unit for so many years. This was one of the best integrated amplifiers of it's day with absurd build quality. The entire G10 line was a true feat of engineering by Onkyo and deserves to be played and enjoyed for years and never relegated to "storage".

Nice to see you again :-)

@MaxKoschuh

5 жыл бұрын

Hi Karl. Thank you so much!

I once had a problem with the voltages being way of spec in a amplifier which was caused by a missing ground.

Correct I need this amp badly

If everything is floating at V+, I would guess you've lost the ground on that circuit board. The bodged wiring does go to an earth tag amongst other places, so that's what I would be looking at.

@alancordwell9759

5 жыл бұрын

I agree with that. Got to be an open ground.

@MaxKoschuh

5 жыл бұрын

Thank you! A good guess. Will check that ASAP.

@MaxKoschuh

5 жыл бұрын

@@alancordwell9759 Thank you Alan.

Massive capacitor values for the power supply! Sounds like the transistors are not being biased. Has the drivers failed. Also check fusible resistors.

@MaxKoschuh

5 жыл бұрын

Hi Simon. Thanks, will check that!

You have an amazing crib. I assume the amp to be class A, I'd shunt the input of power stage first, bypassing volume control, preamp and all to isolate that stage to see if the problem lies in power amp stage. That's a beautiful beast

@blackwingmaster141

5 жыл бұрын

I wouldn't say that this is class A amp - class A amp with heatsinks of that size would push arround 10W,or even less output power. From what I found online, this is 2x 150W/8 ohm or 2x240W/4 ohm class AB amplifier

@lalmuanpuiamizo

5 жыл бұрын

@@blackwingmaster141 Thanks for the info, i haven't look it up at all. But i hope this diagnostic method, isolating fault first would apply to any class of multistage amp, right?

@blackwingmaster141

5 жыл бұрын

@@lalmuanpuiamizo In general, yes

@MaxKoschuh

5 жыл бұрын

Hi, thank you for your comment. Isolating the main amp, from all other stuff, is a great idea!

At 4:20 on time the fuses you show, we'll one of them is blown I can see in the video that the right one from your finger the metal thread is split inside the fuse.

@MaxKoschuh

3 жыл бұрын

the fuse is fine. thanks anyway

I have already repaired several A-8990 the big problem on these amps are the power capacitors that are hs and that causes random ploq on the channels when its does not degage them outright

@MaxKoschuh

5 жыл бұрын

Hi Steven. Thank you for the hint with the large caps. What do you mean by "hs"?

@uchu007

3 жыл бұрын

Remplace les 2 transistors 2sc2229 dans les optocoupleurs sur les cartes d'amplificateur.....

Hi Max, did you ever get hold of a schematic? I also have an A-G10 which is in need of repair. I have the original remote control which motor drives the volume control and also offers phase inversion, regards Rowan

Wann kommt part 2?

netzteil hast du wohl gecheckt das beide schienen (positive und negative betriebsspanung der endstufe) da sind? hat da vielleicht jemand am massepotential gebastelt (mit den schwarzen, evtl. nicht originalen, kabeln?? sehr merkwürdig wenn an allen 3 pins exakt die gleiche spannung ist; oder gibt es minimale unterschiede?? ich hoffe du bekommst diesen sehr schönen verstärker wieder hin und er klingt dann auch gut (nicht so oft der fall bei japanischen meiner meinung nach :P ).

@MaxKoschuh

5 жыл бұрын

Ja, die symmetrische Hauptversorgung ist da, und stabil. Auch die übrigen Versorgungen sind ok. Ich denke auch dass an den kabeln etwas gebastelt wurde. Ich schaue wegen dem Schaltplan, dann messe ich alles gründlicher,... mit Kamera. Der kleinere A-8870 spielt ganz hervorragend. Ich erhoffe mir vom größeren Bruder einen anständigen Klang. Aber ja, wer weiß....

Is there anyone who might possible have a spare or be able to mold a copy of the battery compartment cover for the A-G10 remote control. I have been using one of these for my home theater and the remote has had its batteries falling out since I inherited the thing from my grandparents XD

Einfach aus Neugier: bist du weitergekommen und konntest das wunderbare Teil retten?

Prehaps input stage failed, or maybe output stage driver?

@blackwingmaster141

5 жыл бұрын

I would disconnect every single wire coming to or from amplifier module, except for power supply(to make shure that output amplifier is failing, and not something in preamp section) Also, I would check every transistor and diode on board, perhaps even capacitors . I had similar failure on my amplifier, based around STK4048 hybrid module. Output just "stuck" to negative supply rail, however in my case negative rail output transistors shorted

@MaxKoschuh

5 жыл бұрын

It could very well be a broken input / driver stage, or one of the black, isolated amp blocks. Since there is DC on BOTH channels, I hope it can be tracked down quite easily.

@MaxKoschuh

5 жыл бұрын

@@blackwingmaster141 excellent hint with disconnecting all stuff. thank yxou so much!

Did you find the problem with the amplifier? I got the manual with full schematics.

@MaxKoschuh

3 жыл бұрын

I really need the schematics. Can you send them to me?

@jesperdegerman

3 жыл бұрын

@@MaxKoschuh Hello. Sorry for the late answer. Is it okay to take photos or scan the manual and e-mail it? If you are still interested..

IT FOR SALE

not grounded. service manual will tell where all the grounds are

I want the luxman amp!

@MaxKoschuh

5 жыл бұрын

Hehehe, yes, it is wonderful! One has shorted transistors, and one has the typical leaked main caps. I don't sell them atm though :-|

@SoddingaboutSi

5 жыл бұрын

@@MaxKoschuh let me know if you do please Max.

Был в ремонте такой. была неисправна микросхема мотороловская в одном канале

Can a person by items from you

@msylvain59

5 жыл бұрын

www.ebay.de/str/Max-Koschuh-Online-Shop

die fehler bei denen nix verbrannt oder explodiert ist, sind immer blöd zu finden :P

@MaxKoschuh

5 жыл бұрын

LOL, ja

@Horst021

5 жыл бұрын

Wie heißt es so schön: "Suched, so werdert ihr finden"...:-) Im Prinzip hat der Autor auch Recht..... Nur sagt Er nichts darüber wie lange zu suchen wäre. Tröstet euch mit dem Gedanken das der WEG das Ziel ist......:-) - Tzz, ich bin wieder gemein heute..... Aber denkt euch nix dabei, ich bin auch "auf der Suche" :-))) - BTW: Hat wer ne Idee wo ich ein SM von einem "FISHER RS-9010" herbekomme? - Grüße und ein schönes Wochenende! Horst

Please don´t do anything on this amp if you don´t have skill and knowledge to repair it. Send it to someone who have a lost of experience before you do some more damage.

@MaxKoschuh

3 жыл бұрын

I will NOT do any harm to this amplifier :-) It will be repaired.