Ian Kellog's G07-CBO Cap Kit Curl Mod Help

Joec2003

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Can anyone explain to me Ian's Horizontal Curl Mod? It didn't make much sense so I ended up following Bob Robert's instructions.

Ian's says:

Horizontal Curl Modification
1) Remove and discard C501
2) Remove C303 and install it in C501 with the positive lead in the hole closet to the edge of the PCB
a. See included Cap Map for orientation
3) Install included C303 in the now empty C303 holes

Step 2 doesn't make sense. The C303 from the board is a ceramic capacitor with no polarity, there is no positive lead.

His cap map also shows the new C303 being installed with opposite polarity as Bob Roberts' instructions. Ian's instructions also make no mention of filling in the outside hole like Bob does.

Is Ian's way just a different way of doing it or is it a mistake? I would hate to see someone ruin their chassis if this is a mistake.
 
I haven't read it.

Assuming you are copying it word for word, it seems to be a mistake or missing a step.

C303 replaces C501 with no polarity awareness required.

A 22uf 25v capacitor should be installed into C303 with positive leg closest to the edge of the chassis. (in my experience it helps with the curl vs a 10uf capacitor).
 
The last step is to install the sync modification upgrade which prevents horizontal curl caused by mismatched negative sync output of certain games and the GO7-CBO chassis. FIRST: Remove C501 and throw it away. SECOND: Remove C303 then install it in position C501 and solder it in. THIRD: Remove solder from pad between the two holes of C303 and then fill the one hole furthest away from the edge of the chassis with solder. FOURTH: Install a 10 uF @ 100V radial lead capacitor in the closer holes at C303 with the positive lead in the hole closest to the edge of the chassis PCB and solder in place. FIFTH: After powering up the chassis adjust the H hold for a center point without the curl.
A good practice is to always remove old solder from all input headers and reflow new solder on them to eliminate cold solder joints. Make sure to do this with a connector on the pins otherwise when you heat them to remove the old solder the pins may drop out of the PCB and also the connector will keep the pins straight.



this is copied off my cap kit list for the go7. i hope this makes sense.
 
Thanks guys, sounds like ian's is missing a step and has a polarity mistake. Both of your instructions sound like the bob roberts method that I followed.
 
As tron guy mentioned, use a 22uf 25v(or 50v) instead of the 10uf 25v(or 50v), for better results in C303. I believe I learned about that from one of his previous posts, and have been very happy with the results. The 10uf will help, but the 22uf provides a better cure.
 
I have fixed and updated the instructions. with a now 22uF cap.

I will further improve the instructions with better photos so that the instructions are more clear.
 
You guys are right the 10uF from the kit had lots of curl. Swapped it with a 22uf and it cleaned most of the curl up
 
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