Kenwood KR-V126R - Need Help ID'ing Impedance Switch Polarity

Apr 02, 2007 3 Replies
T

My problem is that I need to know which side is less than 8 or which side is 8 or more. Kinda dumb I know, but I had to twist the lines around to get at the switch, and now I am not sure which is which. One side has yellow wires and the other has white. When the switch is moved to one side it shorts those lines to ground thru a set of green wires.



The wires themselves go back to the power transformer (the yellow and white ones). The green ones go to the main power board and to ground.



Thanks,


- Tim -


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T

In addition I would like to verify the the regulator id'ed as IC12 on the main board is supposed to be a 78M15. there has been work on this area and it seems to be sensitive to the problem I am trying to solve. I subbed in a 78M12 with a 1200 resistor on the ground to get 15.2 V, but the receiver got very noisy.

- Tim -

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T

Hello,

In general, the 8 ohm position will be the one with higher voltage from the transformer. All you need to do is measure the voltage on the output of the switch, and see which position has the higher voltage on the green wires, which you've described as the output from the switch to the rectifier.

PLEASE NOTE: I'm assuming that your description here is accurate, and that is not other wiring to the main power supply.

Regards, Tim Schwartz Bristol Electronics

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T

OK I measured across the green set, and one position has 90-95 and the other 120-125, The reading fluctuates a fair amount, but there is definatly one higher side, so I'll assume that's the 8 ohm or higher side.

Thanks for the lesson,

- Tim -

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