Star Tech Journal

Issue: 1990-November - Vol 12 Issue 9

Status: Data East Solid State Flippers
Pete Gustafson
Data East Pinball, Inc.
Melrose Park, Illinois
FOUR YEARS AGO, DATA EAST PINBALL DIDN'T EXIST.
Today we are the driving force behind pinball for
the 90's. We arrived at this position by doing one
thing very well ... we listen and we react. You
won't catch us standing still. We have a simple
rule here, "lead, follow or get out of the way."
FEATURES
Distributors and operators have told us what
they want to see in a pinball game and we
delivered with features like:
Moos
Below is a procedure for modifying the Solid
State Flipper board from the first version used in
RoboCop to the latest one used in Back to the
Future.
Our experience with our solid state flippers has
been excellent. Since introducing it in RoboCop
we have discovered better and more reliable
ways to get the flippers to operate in a manner
that players are accustomed to.
-Factory applied mylar. Regardless of what
you've heard, mylar is the longest wearing sur-
face for a pinball playfield, period.
Specifically, we changed the cabinet flipper
button from a leaf switch to a micro switch which
prevents dirt build up and minimizes adjusting.
Then we found an even better micro switch with
gold instead of silver contacts. We also madd
some improvements to the PCB design. These
changes completely eliminate very rare symp-
toms which did 'not cause a service call but did
effect flipper feel and possibly earnings.
Take a look under the playfield of our first game,
Laser Wru:- and then do the same to our latest,
Back to the Future. If the back glass didn't say
Data East, you wouldn't know they came from
the same factory. They don't look the same
because we continue to bring you the improve-
ments you've asked for.
These changes did not all happen at once. The
bulk of them occurred between RoboCop and
Phantom of the Opera. Look your boards over
carefully to see what changes are necessary. All
BITF games have the version F flipper boards.
No updates are necessary for BITF flipper
boards.
WHAT HAVE WE DONE LATELY? l'M GLAD YOU ASKED ...
What follows are the symptoms and solutions for
the problems we have discovered.
- Guaranteed solid state flippers that have no end
of stroke switches to ever clean or adjust.
- Quick-Loe which allows you to set up and break
down the back box without head bolts.
-New super tough nylon plunger and ball cup for
our Vertical Up Kicker. The material is 50%
stronger and 100% thicker than what we origi-
nally used which means longer life in the field.
-New allen head screws for attaching the flipper
coil stops to the flipper base plates. The problem
of the heads stripping on the old phiUips head
screws is gone.
-New self test features that pinpoint problem
switches and even tell you when the playfield
needs cleaning.
0000
SYMPTOM
Very intermittently while playing, the player may
see the flipper react in one of three ways:
1. Give a weakjlip.
2. Give a double flip.
3. Flip quickly and return to the rest position
without the player releasing the flipper button.
~PROBLEM
There are two possibilities:
Most likely -The cabinet flipper button switch is
dirty or poorly adjusted. In early RoboCop games
we used leaf switches. The contacts of these
switches must be centered over each other and
they must have good wiping action when the
switch is closed. By being dirty or misadjusted,
the flipper board will not get a valid switch
closure from the flipper button. This causes the
above mentioned symptoms to occur randomly.
(On Phantom of the Opera and BITF we have
replaced the leaf switch with a micro switch.)
Least likely -The board is not receiving enough
current from the flipper switch to tum on the
4093 CMOS IC and the 2N3906 transistors
simultaneously. (The 4093 controls the 50v
flipper power driver transistor and the 2N3906 •
turns on the 9v flipper hold in circuit.)
SOLUTION
~irst. simply try cleaning and adjusting the
flipper cabinet switches. This will resolve the
vast majority of problems.
If that does not help, a modification to the board
is required. This modification does two things:
A. It allows the flipper switch to get extremely
dirty. (Originally the switch could cause inter-
mittent problems if the switch had lK ohms of
resistance between the contacts. With the modi-
fJ.Cation the switch can exceed 22K ohms of re-
sistance between its contacts and still work
properly.)
B. It will cause the flipper switch to tum on only
the 4093 CMOS IC. The 4093 then drives both the
50v and 9v circuit.
The modification follows. Please follow along
using the Version F Solid State Flipper board
schematic on page #56 in your BITFmanual for
reference during the modification.
l. Cut the trace to pin 2 of UlA and U2A and tie
pin 2 to +5vdc.
2. Change Rl and R21 to 4. 7K ohm resistors.
3. R7 andR23 are kludged to be a pull up resistor
forCNl-9 and CNl-1. Change R7 andR23 to 1.0K
ohm resistors.
4. Change R5 andR22 to 1 OK ohm resistors. One
side ofR5 and R22 is rerrwvedjrom CNl-1 and
CNl-9 and tied to pin 3 ofUlA and U2A respec-
tively.
5. Q6 and Q 12 are changed from 2N3906 to
2N3904 transistors. Also the collector and emitter
of Q6 and Q 12 are swapped.
6. Change R33 and R34 to 220K ohm resistors.
7. Change Rl 0 and R26 to 390K ohm resistors.
8. Rerrwve and discard C4, C9, Cl0, Cll, Rl2,
R13, R28 and R29.
9. Jumper pin 5 to pin 8 of !C's Ul and U2.
l 0. Change Rl 6 and R32 to 100 ohm resistors.
11. Inspect your work for any solder splashes.
12. Install the board into a game and verify
proper operation.
~
Read and understand the modification before
beginning. If you have any questions during the
modification STOP and call Pete or Amie at 800 /
542-5377
Please see diagrams on next page ...

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