I have a Tek 2235; the trace focus is sharp and the focus control exhibits a normal range of control. However the intensity control has no effect (trace is at max. intensity), retrace is dimly visible. The the voltage across 510K resistors (R888 315V, R889 310V, R890 313V R891 309V) in the focus divider are reasonable. All other scope functions are normal. Suggestions??
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