CRT Alignnient
This month, I'd like to say afew words on CRT
alignment Have you ever replaced a CRT only to
frnd rainbows on screen? Tried degaussing with
no help? Ok, let's go over it again.
* After replacing the CRf, align the yoke back on
the neck roughly where it was on the old CRf.
Snag the clamp just enough to hold it.
* If the game has an internal convergence gen-
erator, then power down, disconnect the +5v
jumper, reconnect the RGB lines and use it to
converge and purify the screen. If not, and no
pattern generator is handy, try this.
* With the +5 jumper in place (RGB lines dis-
* Install the magnets in the same approximate
connected. Sync must be connected!), shrink
the picture both horizontally and vertically to get
a small square block.
* NOW, disconnect the RGB lines from the logic
* Connect additional jumpers from +5v to B&G
place on the new CRf that were in the old one
(roughly just ahead of the guns).
board and install a jumper from +5v to the red
monitor input. Leave the sync connected. Power
it up. This will give you a red screen (on most
monitors - some AC coupled monitors this won't
work, and it's back to the shop for the pattern
generator). Gently loosen the yoke clamp and
move the yoke back and forth on the neck to give
a full solid color screen without rainbows. Also,
level the screen with the tube outline.
*Snug the clamp. Degauss theCRfatthis point
and then double check your yoke setting - pic-
ture square and mono colored? Fine. Go ahead
and glue in the rubber yoke wedges.
inputs. The square should now be white, on a
black background. Align the convergence to a
single white square. No R, G, or B "shadow lines"
on the edges. Enlarge the picture horizontally
noting any minor corrections and then verti-
cally.
*
Power down, disconnect jumpers and
reconnect RGB lines. Put up the game and check
it out.
I've been told this method was kind of crude. I ~
is, I admit it, but it has worked for me.
Happy gaming.