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andynumbers

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Fully Recapping the D board stopped the jitter
Partially Recapping the E board meant I was able to dial in the geometry properly
Thank you for this info. I wish I had known the culprit for the jitter 10 years ago. I used to have a stack of BVM F series I got for cheap. Sold them all because I couldn't stand the jitter. I still have one 14F5U left that also has the jitter. At least I know how to fix it now.
 

hatmoose

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The ISR (BC) board is next on the list - I need to dump the eproms before they fail, and given how rotten all the SMD caps have been on all the other boards I'll redo those too

IC full list
1652851363986.png


And the digikey cart
IC 31 and 121 are nothing to do with this, but I need them for another project, adding them to the list just in cse
1652851396439.png


I should probably also dump and refresh IC107, IC108 and IC3 while I'm working on this. Of course this being Sony; Why use one EPROM when you can use THREE!!!
IC107 and IC108 = 27C256, these are (weirdly) available new locally, for about $15 each.
IC3 = 28F020P-15, these might be a bit harder to find.
 
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