Star Tech Journal

BALLY /MIDWAY
ELECTROHOME/WELLS
TRI-SPORTS FLICKER
GARDNER FADING
Bill Johnston
Johnston's General Store
Buffalo, New York
James Beck
Greater Southern Distributing
Atlanta, Georgia
PROBLEM
Annoying flicker in Bally /Midway's Tri-
Sports video which can promote eyestrain.
SYMPTOM
The left side of the monitor is dark while the
right side displays normal video.
SOLUTION
New updated Roms available from your Wil-
liams/Bally /Midway distributor cures this
condition. Call for availability.
CAUSE
The problem described is caused by a poorly
filtered B+ boost coming from the flyback.
OBSERVATIONS
Tri-Sports does have appeal but I question
the menu type of choices and wonder if it
would be more player-friendly with separate
game select buttons [3]. Somehow, I felt it
leaned a bit toward the Playchoice game type
selecting method, which is fine for the kids,
but unfriendly for the tavern adults ... or so
it seems from here.
SOLUTION
On an Electrohome G07 chassis monitor the
filter cap is located on the neck board. Check
or replace cap Cl07, 10 mfd at 250v. When
it fails it causes excessive brightness, i.e.
with the screen control turned all the way
down, the picture still has retrace lines in it.
We do badly need a good tavern piece these
days, so I hope this fits the need & price.
On the Wells Gardner K4900 series moni-
tors chassis, the cap that will cause side to
side fading is C702 ( 1 0uf, 1 0Ov) located near
the flyback on the main board. Replace this
cap with 1 0uf at 160 volts
***
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1990 UPDATE FOR S*TJ's
MONITOR MANUAL
New! Monitor articles covered in 1989/90 publishing
year in a handy format. Over 30 new video monitor
Symptoms & Fixes that appeared in STAR*TECH
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Update your technical library with this valuable refer-
ence text. $9.95 (2.50 s/h). S*TJ, PO Box 1065,
Merchantville, NJ 08109. COD call 609/662-1080.