Richard,

The voltage at the R40/31/30 junction should be in the order of -180VDC with respect to the chassis. Note that this is the negative bias voltage generated across R40.

If your voltage is +132V at R40/31/30 you have big troubles – maybe check again to see if it is in fact negative.

Next check the voltages at the cathodes of V2 and V4 these should be in the vicinity of -3.6VDC – mine are -3.2 and -2.8 and the generator works OK. This is pin 3 on V2 and 4.

Also check the grids of V2 and 4. Pin 2, ?and these should be around -19.5 or some such. Again mine are different at -16.5 and -16.7.

Another check is to monitor the voltage at the junction of R40/31/30 whilst changing the Range switch from x100 to x 10K. there should be very little if any change. This checks to see if there are any issues with the two output transformers.

One more thing – on almost every 200CD that I have see C12 100uF NON POLARISED has gone bad. As we are only looking at the DV characteristics at present disconnect C12 9accross C30/31) and see if there are any changes to the DC bias voltages.

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Good luck

Mark

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