Resistance problem

smithanh · 2301

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Offline smithanh

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on: March 24, 2012, 11:35:52 AM
I need some help! I just completed my Stereomour, and during resistance testing, came upon a problem. The C side measures fine, but A ... not so much. The terminals, measured, and printed resistance are below.

Terminal Measured Printed
5.          4.8K ohms  1.4K ohms
16.        4.6K ohms  1.2K ohms
Pin A1.   4.6K ohms  1.2K ohms
Pin A4.   4.6K ohms  1.2K ohms

I've inspected all of the wiring and the solder joints, and as far as I can tell (and see as some of the connections are pretty well hidden), it looks right. Any suggestions as to where I should begin to look so that I can figure out the problem?
Thanks, Andy


Andy Smith

Offline Doc B.

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Reply #1 on: March 24, 2012, 12:29:13 PM
If you look at the schematic you will see that the cathodes of each the 2A3s is connected to a 1.6K and 4.7K ohm resistor connected in parallel. For the 4.6K reading to show up the 1.6K would have to be disconnected at one end or the other. Look for a missing solder joint on that resistor.
« Last Edit: March 24, 2012, 12:55:37 PM by Doc B. »

Dan "Doc B." Schmalle
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Offline smithanh

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Reply #2 on: March 24, 2012, 12:49:00 PM
Thanks, will head down with my soldering iron and hope to find a bad solder on the 1.6. I'll let you know what happens.
Andy

Andy Smith

Offline smithanh

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Reply #3 on: March 24, 2012, 01:04:41 PM
Mission accomplished! On to voltage checks. Thanks Doc!!!

Andy Smith

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