SE/30 focus control issue

[MJ313]

So I recently re-capped my SE/30 analog board, but the focus control isn't working. Cutoff does work just fine. I have searched the forums and TomLee and trag mentioned R26 as the issue. In addition to that TomLee says this:

"If the cutoff adjustment works, and given that you have verified that the focus control has no effect, the problem is either a bad 1M resistor (the previously-mentioned R26), or a poor connection between the focus control wiper and the CRT focus electrode. Verify that there's continuity between the wiper and J2-9"

What is a focus control wiper??

Also, can I test R26 right on the board, or do I have to remove it first? Or just replace it, because it's probably a cheap part?

Thanks very much for any info.

 

[uniserver]

yeah there is a resistor that is Right there, by the pot that needs to be changed...   i have seen this a few times.

 

[MJ313]

Thank you sir, for the confirmation. I will just replace it and touch up any bad solder joints on the video board connector.

 

[MJ313]

By gawd it works!

I got this one:

http://www.mouser.com/ProductDetail/KOA-Speer/MF1-2LCT52R105J/?qs=sGAEpiMZZMv8QEQcPUP6BZbIQ8lyR96u

I threw it in, repaired some joints and it works a treat.

Thanks Charles and trag!

 

[uniserver]

awesome!  i knew you could do it!

 

[trag]

You're welcome.

Old searchable postings, the gift that keeps on giving.