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Need Help with Onkyo M-5090

A

ajaj

New Member
Hello,

Anyone on here knows how to fix/trouble shoot these Amplifiers and maybe can guide me or recommend a service place that knows how to work on these in the Sacramento area ?

I was trying to minimize the slight hum I have in the Right channel and to make a long story short, I did something and ended up with one blown fuse and a blown diode on one channel.

Also the matching pre-amp has issues in the Turntable/Phono section, where the sound is muffled. Everything else works fine on the pre-amp.

Would appreciate the help.

Thank you.
 
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What is SS, is that the German SS :-) I do have a dmm and know how to use it, although the one I have is Analog not digital, so I guess no.
 
SS='Solid State' an analog meter is okay but may not be accurate. You can get a Dmm digital for about $30 or less that is good enough. What exactly did you do that blew the fuse and diode? Obviously a short. This may require testing output and perhaps other transistors in the right channel.
Examine the service manual and see if you can understand it and identify components etc... if not in your talents then best to search out a service or individual. As for the preamp phono section that will probably require some refurb usually some caps are in order maybe more. Also you need to be pretty good at soldering and unsoldering w/a decent iron.
Anyway review all your options.
https://www.hifiengine.com/manual_library/onkyo/m-5090.shtml
 
Hi,

I appreciate your help.

What I did on the Amp was to disconnect the Right Chanel board then re connect it (There are 2 boards, one for each Chanel). This caused a spark which fried the fuse and a diode on the board. The fuse is on the other board which has 2 fuses, one of them is fried. Stupid and careless, I was frustrated.

I seem to have a larger problem which I can't understand:

I had this same issue at my previous place too....this hum in the Right side. I thought it is the Onkyo amp but now I am using another amp and getting the same hum.

I changed speakers, speaker wires, RCA wires. I have an amp, pre amp, a tuner and a TT. No matter what I do I still get this hum.

I am now using one of those "Power conditioner/protectors" and everything is plugged into it and still have this hum.

The components are stacked on an industrial style steel shelf but even when I had stacked on a table at my last place I still have this hum and only in Right side.

Any ideas ?

Thank you.
 
ajaj said:
Hi,

I appreciate your help.

What I did on the Amp was to disconnect the Right Chanel board then re connect it (There are 2 boards, one for each Chanel). This caused a spark which fried the fuse and a diode on the board. The fuse is on the other board which has 2 fuses, one of them is fried. Stupid and careless, I was frustrated.

I seem to have a larger problem which I can't understand:

I had this same issue at my previous place too....this hum in the Right side. I thought it is the Onkyo amp but now I am using another amp and getting the same hum.

I changed speakers, speaker wires, RCA wires. I have an amp, pre amp, a tuner and a TT. No matter what I do I still get this hum.

I am now using one of those "Power conditioner/protectors" and everything is plugged into it and still have this hum.

The components are stacked on an industrial style steel shelf but even when I had stacked on a table at my last place I still have this hum and only in Right side.

Any ideas ?

Thank you.
Click to expand...
Have you tried swapping the input's from your preamp right to left to see if it changes? Your description sounds like the preamp is the culprit.
 
ajaj said:
I have tried 2 pre amps and 2 amps already and it is the same. It is always in the R Chanel.
Click to expand...
2 different amps AND 2 different preamps? Well, the trouble isn't an amp or preamp.

Have you tried different interconnect cables? About the only variable left.
 
I need to pick your brains please:

As I am going crazy with this issue:

Everything listed is Solid State.....NO tubes.

Ok, so when I had my Onkyo Amp and pre amp connected, I had a hum in the Right Chanel. This is the same Onkyo Amp where I ended up burning a transistor and fuse because I was trying to eliminate this Hum issue.

It sounds like Vooohhhh. and it is constant.


I thought it was the Amplifier.


Now I have a Mitsubishi amp connected to a phase linear pre-amp and a separate tuner. The Left Chanel is clean and has no hum noise, when I switch the speaker wire (same speaker & wire) to the Right side I get that same hum again I was getting in the other setup.

This same hum was happening when I lived in a different city.

I don't understand what or why this is happening. I replaced components, wires, speakers, outlets where the components are plugged. I plugged everything into one power strip, different strips, into the back of the pre-amp and made no difference.


Why do I keep getting this hum in the R side Only ?

It is driving me nuts and don't know how to get rid of it. I grounded the system every which way, it made no difference.

I NEVER had this issue when I used an Integrated Amp, only when I use an Amp, and pre-amp setup.

Would appreciate any help.

Thank you,
 
ajaj said:
Now I have a Mitsubishi amp connected to a phase linear pre-amp and a separate tuner. The Left Chanel is clean and has no hum noise, when I switch the speaker wire (same speaker & wire) to the Right side I get that same hum again I was getting in the other setup.
Click to expand...
Are you saying that the same speaker and wire hooked up to the onkyo and the mitsubishi causes a hum in each right channel setup?
So if using another speaker you don't get hum in the right channel either setup?
 
Binkman said:
Are you saying that the same speaker and wire hooked up to the onkyo and the mitsubishi causes a hum in each right channel setup?
So if using another speaker you don't get hum in the right channel either setup?
Click to expand...


What I am saying is that I get the hum in the R side. I tried different speakers and wires. I also just tried in this last set up using the same wire & one speaker...when I connect it to the R. side there is a hum and when I connect it to L side it is clean. Thank you.
 
I understand the hum in the right channel. also in the mitsubishi?
ajaj said:
Ok, so when I had my Onkyo Amp and pre amp connected, I had a hum in the Right Chanel. This is the same Onkyo Amp where I ended up burning a transistor and fuse because I was trying to eliminate this Hum issue.
Click to expand...
I think you should keep searching for a repair shop.
 
2 sets of different gear and the issue is the same. How can it be that all this equipment have the same issue....hum in R. side ??
 
Does the right speaker cable run in close proximity to a power cable? Do you hear the hum if you use headphones?
 
Well, I moved the wires around and it made no difference. And it has always been the R. Chanel so what are the odds that the wire of the R. side is always in the wrong place?

As I recall, no hum through headphones.
 
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