Star Tech Journal

S~R-TECH _ _ _ _ _ _ _ _ _ 3
STAR• TECH Journal would like to welcome Todd Erickson of Summit Amusement,
St. Paul, Mn., as a regular contributor. Todd will be reporting on field service and
offering tips and solutions to problems encountered on location.
Williams
Flipper
Notes
3.1
by Todd Erickson
1 . A few fiber links on "Fire
Power"
and later games have a link with no
fiber in them. The sides will be
brown plastic with no fiber
showing. I recommend changing
these as soon as they are spotted
as they are unreliable.
2. Williams games made in the last
four months have E.O.S. (end of
stroke) points on the flippers with
welded-on contacts. These blades
have been breaking.
have been using Wico one piece
flippers for direct replacement for
about one year now with no
breakage. It is a good idea to
replace all flippers when shopping
a game.
4. The fiber link on
new style flippers
is not cut out enough for the return
spring. I recommend notching the
link so the spring won't collapse
into itself.
5. Since most locations don't have a
vise, I recommend carrying a
complete right and left crank arm-
link-plunger assembly. Also, make
sure that the plastic shield on the
crank arm is in place. If not, the
crank arm will wear through the 1 r - r - - ~ . , .
F..O.S. point.
Cinematronics Analog sw;!ch Substitution Board
The industry-wide shortage of
analog switch (LF13331) which is
used in the Cinematronics Display
Assembly, has made it necessary
to use a substitution. The
replacement part is No. Hl5045 (or
Hl5049).
Due to the discrepancy between
the pinouts of the LF13331 and
the Hl5045, it is necessary to add
a small printed circuit board to the
display assembly to allow easy
reliable installation of the H 15045
analog switch in a 16-pin socket,
filter caps for the regulator circuit
r.onsisting of R1, R2, D1, and C1
and a 1 ~-111t,i ,, ~ 2-~in double
ended ribbon cable assembly.
The Hl5045 is a CMOS DPST
analog switch with operating
characteristics similar to that of the
LF13331. It requires a +5-volt
supply for proper operation. This
supply is furnished on the board
and is derived from the +15-volt
supply line. The + and - 15-volt
supply lines and all the necessary
signal lines are linked between the
PCB and the Display Assembly thru
the 16-pin ribbon cables. The PCB
is mechanically fastened to the left
hand facing edge (as you look into
the back of the display assembly)
of the display chassis with two
sheet metal screws. Troubleshooting
procedures for the display
electronics remain the same as
before with the Hl5045 electrically
replacing the LF13331. The only
additional consideration is the 5-
volt regulator circuit on the PCB
itself.
Use of this substitution device in
manufacturing began with "Rip-Off"
Game Serial Number 64200, and
continued for the balance of the
production run. The device is also
being used in "Star Castle" until
the LF13331 becomes available.
When the LF13331 is available,
Cinematronics will replace the
substitution device at your request ~
on a credit-upon-return basis.
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