Sony STR-6065 Receiver Left Channel Issues - Page 3

Mooly · 18th July 2011, 12:04 PM

MJE like this,

Draal1000 · 18th July 2011, 12:29 PM

My aim is to check voltages later this morning (Chicago time LOL), when my 1 yr. old naps.

Here's some more pics. One is a full version of the power amp board showing everything. And I hope the 2 pages describing the power amp section come out clear enough to read.

Draal1000 · 18th July 2011, 12:36 PM

And that image you posted is just like I have it right now.

Draal1000 · 18th July 2011, 01:00 PM

I did a test. 20v across B -E. Will double check hopefully soon.

Mooly · 18th July 2011, 01:29 PM

Quote:

Originally Posted by Draal1000

I did a test. 20v across B -E. Will double check hopefully soon.

Definitely recheck that. A base emitter junction behaves just like a diode when forwar biased. The volt drop can not exceed approx 0.8v even if the current continues to increase. If it were reversed biased then it usually limits at some indeterminate value but that's a condition that is never normally encountered. It's a no go area. For the NPN device (the MJE) the base will always be positive with respect to the emitter.

Thanks for the layout etc...

Draal1000 · 18th July 2011, 04:31 PM

My readings are:
E 36.6
C 54.5
B 16.2
How I measure: Black probe connects to chassis ground and red probe does the measuring while unit is powered on. The collector reading seems right; just not "getting" why the other numbers are off so much. Looks like I'll be needing to do more probing to determine the problem.

I checked my pinouts on the new transistor a few times to make sure I didn't goof up there. Aim to do more voltage reading on other components on this board later today. Time to re read the manual lol!

Mooly · 18th July 2011, 04:41 PM

It's reverse biased so something is seriously amiss...

The circuit posted is a bit blurry to work on comfortably... have you got it as a pdf ? You can PM me with it if you want.

Mooly · 18th July 2011, 04:43 PM

Just going to post something for you to measure in a moment...

Mooly · 18th July 2011, 04:48 PM

This isn't making sense...
Can you measure these voltages and record them... A and B are what you have measured already.

Draal1000 · 18th July 2011, 05:03 PM

Will do. Working on a way to see these files better.

18th July 2011, 04:41 PM	#27
Mooly diyAudio Moderator Join Date: Sep 2007	It's reverse biased so something is seriously amiss... The circuit posted is a bit blurry to work on comfortably... have you got it as a pdf ? You can PM me with it if you want. __________________ ------------------------------------------------------- *A simulation free zone.* *Design it, build it, test it.*

18th July 2011, 04:43 PM	#28
Mooly diyAudio Moderator Join Date: Sep 2007	Just going to post something for you to measure in a moment... __________________ ------------------------------------------------------- *A simulation free zone.* *Design it, build it, test it.*

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18th July 2011, 12:36 PM	#23
Draal1000 diyAudio Member Join Date: Jul 2011 Location: Oak Park, IL	And that image you posted is just like I have it right now.

18th July 2011, 01:00 PM	#24
Draal1000 diyAudio Member Join Date: Jul 2011 Location: Oak Park, IL	I did a test. 20v across B -E. Will double check hopefully soon.

18th July 2011, 04:31 PM	#26
Draal1000 diyAudio Member Join Date: Jul 2011 Location: Oak Park, IL	My readings are: E 36.6 C 54.5 B 16.2 How I measure: Black probe connects to chassis ground and red probe does the measuring while unit is powered on. The collector reading seems right; just not "getting" why the other numbers are off so much. Looks like I'll be needing to do more probing to determine the problem. I checked my pinouts on the new transistor a few times to make sure I didn't goof up there. Aim to do more voltage reading on other components on this board later today. Time to re read the manual lol!

18th July 2011, 05:03 PM	#30
Draal1000 diyAudio Member Join Date: Jul 2011 Location: Oak Park, IL	Will do. Working on a way to see these files better.