Re: Tektronix 2230 - no readout



I've just had a similar issue with my 2230 - very faint and fuzzy image on the CRT, but Beam Find displays a solid rectangle. I found that R886 (180K) at the bottom of the Focus divider chain had gone open circuit for no obvious reason. You can check for this with simple resistance checks between the -8.6V rail and the -2KV Cathode supply rail. You can also check the focus voltage on pin4 of the CRT with a proper HV meter - around 1½KV is fine, but 2KV indicates a fault.

Hope this helps,


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