Sony Monitor SCC-L22D-A (Dell) G2 Voltage ?

There is normaly a pot to adjust the G2 voltage. Look on the back of the HV multiplier. The pot is usually marked Screen, or G2, or Bias. '

In a dimly lit room, turn down the G2 bias to just slightly past the point where the retrace lines have disappeared. This should be the correct range for most CRT's.

If you find the main brightness control lacks proper range after adjusting the G2 bias, then look for the CRT beam biases or the master bias to correct for this. This is for the electron-gun grid cathode bias, not the G2 bias.

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JANA _____

I determined by clipping resistors into the feedback string that the regulator is functioning, and an 8.2M across the top 10M makes it work so good that I am almost tempted to just leave it that way. But something has obviously changed. Bias and gain settings in the color menu look reasonable. Is there maybe a Zener reference that has gone South?

Anyway, if I knew what the G2 voltage is supposed to be, it would be helpful in determining whether this circuit is the problem or I need to chase other things down.

TIA

This is not your run-of-the-mill TV set. It's a high end dual focus trinitron. The two pots on the IFT are both focus voltages. G2 is controlled by a shunt regulator. If there is any G2 adjustment, it must be from a service menu which I currently don't know how to get into.

I have effectively done this by altering the regulator feedback as I described, but I worry about how stable this might be since something has apparently drifted since it left the factory, and it doesn't really address the issue of why this now needs to be done. And the change I had to make was on the order of 25%, which is large enough in itself to be cause for wonder...

The service manual is at

It covers

CPD-E500 (US/Canada) Chassis No, SCC-L22P-A & CPD-E500E (AEP) Chassis No, SCC-L22N-A

(At a guess SCC-L22D-A could mean OEM'd to Dell)