Onkyo receiver/amplifier

[Tube_Dude]

Re: Onkyo receiver/amplifier

Great! Thanks for sharing.

[lmcancu]

Re: Onkyo receiver/amplifier

Thanks everyone! especially Steve2 and Tudedude for the schematic and identifying the right part and function. I got the components today. They were a little bigger in size to the broken one but the lead spacing was the same. Removed the wire, and the other coil, popped these in, and the sound is great!! The stereo was always working as Tudedude had explained indirectly. It was an operator error in pressing the FM Mute Mono button. Looking forward to my next challenge

[lmcancu]

Re: Onkyo receiver/amplifier

Forgot to ask about the maximum DC current. Do I need to worry about that parameter. The part I picked has a max. of 35 mAmps. Is this a typical value for this application?

[Tube_Dude]

Re: Onkyo receiver/amplifier

Thanks Tube_Dude, I ordered them. Just curious, but is there any harm in leaving it shorted for now? Is there a degradation in sound quality, etc?

No harm. Just some brighter sound, till you put again the coils in circuit. But you can hear the news in the radio and some music without any fear.

Well, in second thought, sometimes the news are really frightening...

[lmcancu]

Re: Onkyo receiver/amplifier

Thanks Tube_Dude, I ordered them. Just curious, but is there any harm in leaving it shorted for now? Is there a degradation in sound quality, etc?

[Tube_Dude]

Re: Onkyo receiver/amplifier

ok I think I understand now, and the K signifies 10%. I found something in Mouser that kind of looks like the same piece but slightly bigger. Would this do?

http://www.mouser.com/ProductDetail/...h1d6TBbW3RE%3d

I would buy two, for perfect left right simetry...

[lmcancu]

Re: Onkyo receiver/amplifier

ok I think I understand now, and the K signifies 10%. I found something in Mouser that kind of looks like the same piece but slightly bigger. Would this do?

http://www.mouser.com/ProductDetail/...h1d6TBbW3RE%3d

[Tube_Dude]

Re: Onkyo receiver/amplifier

The old eyes aren't what they used to be. Good catch.

I know, my friend. I'm 57 and only with reading glasses and almost sniffing the schematics, I can (or i think i can... )...

[steve2]

Re: Onkyo receiver/amplifier

You are correct. I just looked again at the L110 and C176. At that section , they are seperated better and can see that 102j is for the cap value. I saw the 183 on the inductor in the pic, but I read the 102j at the lower location which is squeezed. Should have put my magnifier visor on. haha. I had it blown up to 400%. The old eyes aren't what they used to be. Good catch.

[Tube_Dude]

Re: Onkyo receiver/amplifier

The schematic has it as a 102j which I don't know if is 1000uh? .

Hi Steve

The 102j is the capacitor C175 in parallel with the inductor, 1nF ( 1000 pF )...

[Tube_Dude]

Re: Onkyo receiver/amplifier

I got the spec from Steve and in the schematic L109 says 102j. 102j is 1 mH with 5%. Are you sure about the 183 markings? Maybe the schematic is out of date?
Also, I'm thinking the inductor is also used for the pilot tone detection as well as removal and makes the stereo detection not work since the inductor is shorted.

See, you have the inductor in hand. What is written in it? I think (from your pic) that is 183...

About the inductor less making the stereo decoding inoperative, is not possible, it should work.

[lmcancu]

Re: Onkyo receiver/amplifier

I got the spec from Steve and in the schematic L109 says 102j. 102j is 1 mH with 5%. Are you sure about the 183 markings? Maybe the schematic is out of date?
Also, I'm thinking the inductor is also used for the pilot tone detection as well as removal and makes the stereo detection not work since the inductor is shorted.

[Tube_Dude]

Re: Onkyo receiver/amplifier

Anyone know if the display should say Stereo when the FM channel is Stereo?

Yes, when the transmission is in stereo, the stereo display must say so.

But the inductor is after the stereo decoder, so without any influence in the stereo operation.

See if the receiver have a switch for stereo mode, many have...

In the pic we can see the inductor L109 have written 183, this means 18 with 3 zeros, so the value is 18 mH or 18000 uH.

[lmcancu]

Re: Onkyo receiver/amplifier

Ok, I tried fixing the inductor with no luck. Much too delicate for me! I took Tude_dude's advice and shorted L109 and now both speakers are at the same level. Only catch is that I'm not sure if the Stereo mode is gone now? There is no indication on the display that the FM channel is is Stereo mode, and it seems like both speakers are the same. Anyone know if the display should say Stereo when the FM channel is Stereo? Is this a side effect?

[steve2]

Re: Onkyo receiver/amplifier

I am the same with the eyes. I wear a magnifier visor when working small parts. I would try what you said and solder a piece of fine wire to the existing piece to make it long enough to reach the new post.

[lmcancu]

Re: Onkyo receiver/amplifier

it looks like its going to be difficult. My eyes aren't very good anymore! I removed the inductor from the board. The leads are attached to the plastic and then there is a very find wind from the inductor coil on them. For the lead that is broken, it is no longer in the plastic and the inducutor coil is barely next to the platic hole. I would need to figure out a way to attach a lead from an old capacitor or somehting like it to the plastis base, and solder the wind onto it of which there is very little.

[lmcancu]

Re: Onkyo receiver/amplifier

There are only 2 leads. I tried soldering it it place, but it did not bond. It seems the broken lead is ripped from the base. I'll try removing it from the board to see if I can reattach the lead to the base.

[steve2]

Re: Onkyo receiver/amplifier

Not sure if I am seeing right, but how many leads are on the L109? Looks like 2 broken and more still in the board. Is there no way to solder the leads back together?

[lmcancu]

Re: Onkyo receiver/amplifier

Thanks for the help. I searched for the part but could not find the exact part at mouser or digikey. I found the following parts. Would these work? The dimensions of the original part are about 7.5 mm diameter, and 10 mm long.

http://ca.mouser.com/ProductDetail/F...1HsY9HzTj8k%3d

http://ca.mouser.com/ProductDetail/T...N6NKnHdL2dU%3d

http://search.digikey.com/scripts/Dk...=445-3778-1-ND

Also, I read up on the MPX filter, and understood that it notches out the 19 KHz pilot tone that indicates stereo info so that it doesn't mess up the audio while recording to tape. Is this the only downside to disabling the MPX filter?

[steve2]

Re: Onkyo receiver/amplifier

Thanks Scenic. I put one up earlier , but it was 1.7mb This one is 4mb or so.