Star Tech Journal

STAR*TECH Journal
June 1986
transformer assenblies for their sit-down
cabinets, and using the Wells Gardner for
their unrights. This type of action could
keep both models up and running for an
extended period, thus allowing extra life
of all your STAR WARS games.
I hope this bit of information helps some
of you that have had STAR WARS games out
of order. Please remember that you can use
the cabinet after removing the Wells
Gardner rronitor for a conversion by
inserting a raster-scan monitor. You can
make two games, with the above suggestion,
that will earn,money out of pieces that
were dead wood.
Data East RING KING
and SPEEDY BUGGY Mods
By Neal R. ZOOk/Service Manager
Data Fast
San Jose, CA
RING KING LOCK-UP/STATIC REIATED.
Verify that the earth ground terminal on
the AC line cord is intact and connected
securely to the _20wer s1.1pply chassis_ of
your game. -C'i,nnect a separate length of
flat braided cable from the power supply
earth ground to the coin door frame,
rronitor chassis, and control :panel
assenbly as shown in figure la.~ not
daisy chain the cable as shown in figure
lb. Keep the length of the cables as short
as possible to obtain the best results.
MONITOR.
FAAME
COIN DOOQ..
fAAME.
Figure 1a.
A.C CORD
( 4)
RING KING IOCK-UP/NOT STATIC RELATED.
If you are experiencing occasional freeze-
ups that have been determined as not being
caused by static discharges, there are
several modifications that can be
performed that should eliminate the
problem. Oleck to see if the suspect PCB
set has the following modifications and
perform them if necessary.
a) DATA EAST PCB SE!':
The top PCB (DE-0224) may have a Z-80A at
location 6C. Change to a Z-80B type
device. The lower PCB (DE-0225) may have a
Z-80A at location 14F. Change this to a
Z-80B type device.
Check for a capacitor modification on the
lower pcb (DE-0225) at location SC
(74IS08), between pins 7 and 11. This
should have a 100 pf, 50 vdc ceramic disc
at this location. Add this modification if
it has not been done already.
b) ~PIACE PCB SE!':
The top PCB may have a Z-80A at location
llE @d 9H! __ Change th~se to Z-80B type
devices. Check the Eprom at location 9J
and verify that it is a 250 nanosecond
device or faster. Refer to the Eprom Speed
Chart (c) for specific speed information.
Change the Eprom if it is 300 nanoseconds
or slower.
Add two 220 pf capacitors on the top PCB
at the following locations: 14H, 74LS14,
between pins 3 and 7, and 13H, 74LS08,
between pins 3 and 7.
Wl'E: If any of these modifications are
already installed on your PCB set, do not
duplicate. Contact Data F.ast's Service
Departnent for any roore available
information.
EA/l...TH GROUND
MONITOR._
FRAME
Figure 1b.
CO~i~L
Murphy's Law #804
PANEL.
COIN OOQR.
FAA,1,'IE
The secret of success is sincerity. Cnce
you can fake that you've got it made.
AL. CoRD
EARTtt GRo•JND