A strange horizontal distortion

Franck 78

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Jul 25, 2025
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I recently got 3 MS9-29 for ~$100, a good deal ;)
Stored on the shelf of an 'exploitant' (someone having lot of machine in cafés/restaurant) for 15 years.

Recaped 2 of them, one is OK and the other one add this strange distortion:

geo-defect.jpeg




It was C955 not installed (by me). The 7812 is unable to provide a correct flat voltage and C957/C958/L953 can't do anything. The direct translation to screen is this bizarre inflate ;)
Pincushion and trapeze had no chance to correct this.

I suppose a failing cap can also do that.
 
Looks like your B+ is set to low.
Check B+ with black meter lead on chassis ground and red meter lead on TP2
Set to 76VDC (15khz)
 
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