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Old 7th October 2012, 06:42 PM   #451
bcmbob is offline bcmbob  United States
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DC is usually not at zero at initial power-on. I suspect there may be a cold solder joint along the path. Still need the photos of the underside.
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Old 8th October 2012, 07:43 AM   #452
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Today I connected MyRef FE, No smoke, relay clicked, Light Glowing, but no sound, how to track what is the error.
OK

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How to do measurement.
There are a lot of measure that can be taken... we'll see them as we go on with troubleshooting.

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When spike protection will be activated?
It's not your case, IMHO, usually you hear sound when SPiKE triggers.

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Is this the way to measure DC Offset?
No, you must select Vdc on the multimeter (mV range)

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And One channel is getting warmer when compared to other. Other one is cool not at little little warmer.
I would start checking connections, can you post a pic of the transformer label?

After that you'll check DC offset.
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Old 8th October 2012, 07:55 AM   #453
romvise is offline romvise  Italy
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Hi Badri, I'm not a DIY expert, but for know DC (direct current) offset you have to set your multimeter in the correct scale, I see AC (alternate current) in your pictures.

Roberto

edit: Thanks Dario for your support, I'm late

Last edited by romvise; 8th October 2012 at 07:57 AM.
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Old 8th October 2012, 08:10 AM   #454
bcmbob is offline bcmbob  United States
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I can't tell what is in C30 from the angle of the photos. Is that another Amtran?
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Old 8th October 2012, 03:15 PM   #455
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Today I checked again. Both boards are fine. Problem with one connection from volume pot i think. DC offset for one board is 2.7 and another is 6.3. Is that good value. Thanks Dario, bob, Roberto.

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Badri
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Old 8th October 2012, 04:03 PM   #456
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Today I checked again. Both boards are fine. Problem with one connection from volume pot i think. DC offset for one board is 2.7 and another is 6.3. Is that good value. Thanks Dario, bob, Roberto.
Hi Badri,

DC offset values are fine (if milliVolts ).

So you have sound?
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Old 8th October 2012, 04:23 PM   #457
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Yes, Dario I have sound. It sounds well. But I expected more. The problem i identified is one of the transformer. I checked one board at a time using one transformer, it sounds fine. Then connected both the boards to separtate transformer, no sound one board and measured the DC volt, it went high. I dont know what would be the reason. I will post more information later.

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Badri
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Old 8th October 2012, 04:51 PM   #458
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I feel like it sounds little harsh. Though I am using a below average kenwood speakers for testing. I have to test with MA Rx6. Anyone knows what would be the problem with the transformer. Using one transformer the DC Offset it is showing is .452 by setting DMM to 2.
Any idea?
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Old 8th October 2012, 05:17 PM   #459
bcmbob is offline bcmbob  United States
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Did you measure the AC output on each transformer loop on both before toroids it enters the amp?
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Old 8th October 2012, 07:33 PM   #460
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I feel like it sounds little harsh. Though I am using a below average kenwood speakers for testing. I have to test with MA Rx6. Anyone knows what would be the problem with the transformer. Using one transformer the DC Offset it is showing is .452 by setting DMM to 2.
Any idea?
There's no label on the transformer?

Possibly you wired it incorrectly.

Regarding sound It could depend on a lot of things... source, burn-in, some component orientation ( did you turned again R11s?) and so on.

First thing is to have two working modules and listen in stereo
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