Star Tech Journal

Issue: 1986-November - Vol 8 Issue 9

STAR*TECH Journal
Novembar·1s86 (6)
Williams Notes: EOS Switch, Flasher
Circuits, CPU Reset & Pin Relays
Sol. B+
by Fritz Runyon/Publications
Williams Electronics Games
Chicago, Illinois
END-OF-STROKE (EDS) SWI'ICH CONNECTION
'!he Power Wiring Diagram in the manuals of
the several recent games (HIGH SPEED,
GRAND LIZARD, and OOAD KINGS) shows a
connection error. {Games are correct; only
the diagram was in error.)
The manuals show the EDS switch on the
flipper connected from a winding tap on
the flipper coil to the cathode terminal
(bar across the triangle, or banded end)
of the diode. The actual ros switch
connection is from the winding tap on the
coil to the anode terminal {triangle
base, or unhanded end) of the diode.
FLASHER CIRCUIT
An accidental omission of the flasher
lamps circuit occurred in the manuals for
HIGH SPEED and ROAD KINGS. (It did,
however, appear in the GRAND LIZARD
manual!)
The lamps are in series with the Solenoid
B+ line, which obtains its lighting
turn-on signal via the applicable solenoid
drive line. The lamp circuit connection is
between a 5 Ohm, 10w resistor and a 330
Ohm, 7w resistor.
(Incidentally, a pair of these resistor
circuits is now available on a PC board
for better reliability; its part number is
C-11233.)
~ .~~~
~.,.,.,.,.,.,.,.,.,~.,.,.,.,.,.,.,.,.,.,1
~ so , ________ 3300 ~
Solenoid
Drive
if.
L
if.
~ 10w
?'
.,.,., .,.,.,.,.,.,.,., .,.,.,.,.,.,.,.,., .,.,., ., .,.,.,.,., 7w
.,.,.,.,.,., ;/. ~
~
112-C-11233ResistorCkt. Bd.

189 Plasll.lamps Circuit
For your information the following table
shows the flashlamps used in various
games.
Flash-
Game
lamp#
Comet, High Speed,Grand
#63
#89
#1251
Lizard, Road Kings
Pin•Bot
Pin•Bot (Visor & Insert Bd.
Robot face)
11 CPU RESET
If a game (HIGH SPEED, GRAND LIZARD or
ROAD KING) occasionally resets during game
play, check the various solenoid coils
(flippers, drop targets, eject holes,
etc.) for a broken diode, or an open diode
circuit produced by a failed diode or a
'cold' solder joint.
SYSTF.M
Sometimes, one or more of these diodes has
broken loose (perhaps physically, but
certainly electrically) from the circuit
{and thus shows as "open"). Such an "open"
diode allows electrical "noise" to feed
back into the CPU causing it to reset.
Resolder any suspected 'cold' solder
joints, and replace any broken/faulty
diodes (1N4004, or equiv.) to prevent this
noise feedback.
~
Solenoid
Drive
163 Pwblamps Circuit
When replacing coils {from Williams or
other sources) on solenoids or flippers,
always test the diode for proper
electrical operation!
November 1986 (7)
STAR*TECH Journal
-.., PINBALL GAME RELAYS
Relays mounted on small PC boards with the
applicable 'snubber' circuitry parts are
now available. These are being included in
current garnes (OOAD Kil:l'GS, PIN*Bar);
however, they are also applicable to older
garnes (HIGH SPEED, GRAND LIZARD), when
replacements for the older relay and
separate components snubber circuits are
necessary.
Conversion Hints
By
prevent burned edge connectors on down
the line, on any game that you convert,
cut and tie all of the ground wires
together about three inches from the
connector, and do the same with the 5 volt
lines.
To
The part m.mbers for these Relay-Snubber
units are p/n C-11232 for those used in
the Solenoid/Flasher circuitry (with an RC
{resistor-capacitor) network in the relay
circuit), and p/n C-11232-1 for those used
in the General Illumination circuit
(without the RC parts).
This allows several connections instead of
just one or two, to carry the heavy
current demand of the board.
Also, when you set the 5 volts to the
correct level, don't measure it at the
power supply!
Measure it at the chip furthest away from
the edge connector on the logic board, for
it only matters on the logic board, not at
the power supply terminals.
HIGH EARNI1'(;S HINI'S!
Clean your playfield, polish the glass,
and do those preventive maintenance
touches that keep your garnes in top shape
for your players (and for your earnings).
,,.-.., System 11 (used on HIGH SPEED, GRAND
· LIZARD, PIN*Bar) has a great deal of
"audit" (bookkeeping) information
available, by which you can evaluate how
game features are affecting your earnings.
When you do the usual garne servicing, take
time to observe the percentages provided,
so that you can set your garne adjustments
to give the player a good game, and at the
same time, obtain a top rate of return.
Check the garne's manual to see the choices
on the rnany adjustments provided by
Williams. These adjustments are easily
made; you can 'fine tune' each game to fit
the players' skill at each location.
Good Adjustments= Good Games= High
Earnings!
~
*
Murphy's Law #809
There are some things which are illiX)ssible
to know - but it is impossible to know
these things.
Sam Cross
Godwin Distributing Company
North Little Rock, Arkansas
~
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