Windmiller
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Don't give up yet.
The trace is roughly in the center when the voltages on the Y deflector plates is equal. For the trace to move, something has made one plate higher in voltage than the other. The position control is there to manually adjust the deflector plate voltages and the preset is to set the center point in the mid position of the manual control.
If it is the same as the NRI-2500, first check the 170V supply to the Y deflector amplifiers is correct then check the +9V and -9V supplies, they should be within about 0.2V of 9V, if either is out, the fault lies in the regulator section around Q101 and Q102.
Brian.
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