Re: Tek 7623A - Inverted and compressed Horizontal only from TB (was 7623A + 7A26 + 7B53)


1. trace backwards: check that someone hasn't plugged up either P51 or P501 backwards: they're both 4 way strips so possible to get them the wrong way around?

2. Short scan: you've got something suspiciously close to half-scan, which suggests only one half of the sweep signal is reaching the horizontal amp. Check for circa 200mV p-p ramps on both the horizontal amp inputs (R503 /R509 ) if one is missing the interconnection back to the motherboard might be to blame.

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