SE/30 focus control issue

#1 Fri, 11 Dec 2015 - 14:21

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.

#2 Fri, 11 Dec 2015 - 20:12

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

#3 Sat, 12 Dec 2015 - 16:01

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

#4 Sat, 19 Dec 2015 - 17:15

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!

#5 Sun, 20 Dec 2015 - 07:42

awesome! i knew you could do it!

#6 Mon, 21 Dec 2015 - 03:50

You're welcome.

Old searchable postings, the gift that keeps on giving.