Re: GO7-CBO (13") flyback?

David Shoemaker wrote:
>
> So it was working (with original 1981 caps), I was in a hurry to use
> it last weekend so figured I would recap it this week....
>
>
> Went dark having blown fuse 901
>
>
>
> I recapped it, replaced fuse 901 and replaced the HOT though it tested
> good.
>
>
>
> Turned it on and got HV for a split second then 901 blew.
>
>
>
> HOT now shorted. Borrowed a ringer and it showed the flyback toast.
>
>
>
> Replaced Flyback, HOT and fuse 901.
>
>
>
> Comes up with a good picture except for the curl.
>

Check that you have the caps in correctly. It is unlikely that the
flyback would create the curl. The other thing to check is what is the
HV you are getting from this unit? I think the 13"chassis ran at 100V
instead of the 123V of the GO-8s, but - well, I'm at home and the files
are at the shop - I could be wrong on the voltages.

There was a mod suggested for GO-7s to improve the sync, did your cap
kit include the following info?

"There is an optional C303 upgrade. Some claim it helps with screen
"curling" problems. Here are the steps for that modification.

   1. Remove C501 and discard.
   2. Remove C303 and install it where C501 was installed.
   3. Remove the solder from the hole that is in the middle of the two
holes where C303 originally resided, and fill the C303 hole farthest
from the board's edge with solder.
   4. Insert new cap (10 mfd 50v) in the cleaned holes, with the
positive lead closest to the edge of the board (to the collector of X305).
   5. After installation, you may need to adjust the Horizontal Hold.
Hole you don't have to, as the HHold coil is usual pretty fragile from
heat stress. Leave it alone if at all possible. "

John :-#)#
>
>
>
>
>
> *From:* owner-rasterlist@vectorlist.org
> [mailto:owner-rasterlist@vectorlist.org] *On Behalf Of *John Robertson
> *Sent:* Tuesday, April 03, 2012 9:18 PM
> *To:* rasterlist@vectorlist.org
> *Subject:* Re: RASTER: GO7-CBO (13") flyback?
>
>
>
> David Shoemaker wrote:
>
> I have a monitor that ate the flyback. I couldn't find anyone that
> had the 13" specific flyback so I put a 19" flyback in. It all works
> fine except part of the screen is pretty badly curled (about the top
> 1/2" or so). No adjustment fixes it.
>
>
>
> Any suggestions on getting a solid picture on these or a direct
> replacement flyback source?
>
>
>
> Thanks,
>
> David
>
> Did you recap the monitor at the same time?
>
> Bad caps eat flybacks...
>
> John :-#)#
>
> --
> John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
> Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)
> www.flippers.com <http://www.flippers.com>
> "Old pinballers never die, they just flip out"

-- 
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 
Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)
                 www.flippers.com 
"Old pinballers never die, they just flip out"
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