Star Tech Journal

Issue: 1996-July - Vol 18 Issue 5

July 1996
CID
... continued from previous page.
STARTING FROM SCRATCH
Worst case scenario is the board not repairable. If
a transistor goes and just bums away the board
completely, you have little alternative to building
a new board section.
STAR*TECH
Journal
4 Design Improvements to
the Industry Standard
The "Quick Release"
Ticket Dispenser
Improves serviceability
& reduces
maintenance
Sometimes the shattered portion of a broken board
is best replaced. It is not so bad as it sounds. I use
a hobbyist experimenters board to rebuild the cir-
cuit. In the example of a burnt solenoid driver tran-
"Sometimes your board
invents fire, and the results
can be pretty spectacular!"
sistor, I would mount the replacement and maybe
a couple of supporting components on a small area
of a PC board. Then I would trim the board to
size with a saw. Run jumper wires of appropriate
length back to the original board. Use your discre-
tion when mounting this new board, keep it as close
as possible. For a relatively small piece, I use two
side sticky foam to mount the work nearby or even
stuck right on the old board. Alternatively we could
drill a hole in the board and mount it with a screw
or a bracket.
"Quick Release" face plate
Dynamic, new design allows the
ticket dispenser to "quickly release"
from it's face plate on your cabinet
or ticket door, no tools needed.
Easily replace one dispenser with
another in just seconds. No tools
necessary! The new face plate
retrofits any existing Deltronic
Labs machine.
Bottom METAL ticket guide
The extended, durable ticket guide
prevents curled tickets from catching.
This kind of board damage can be pretty dramatic,
but it needn't be traumatic. A little effort, and per-
haps a bit of tedium, will restore your circuit to
operation.
Foolproof braking system
Our impressive new braking system
eliminates brake slippage, allowing
foolproof, accurate dispensing.
You don't need to pull your hair out.
If only I found that out earlier ...
Optical sensor dust cover
Eliminates dust accumulation and
increases accuracy of the ticket count.
Ill.IA
Another quality product from Deltronic Labs ...
ti tY:ll I =C.,:J
Journal
/he mdu>t,y leade, ;, ticket di,pe,,..,
Deltronic labs, inc.
120 Liberty Lane, Chalfont, PA 18914 • 215-997-7753
FAX I 215-997-9506
STAR*TECH
Journal
July 1996
SEGA PINBALL WHITE STAR SYSTEM
1/0 POWER DRIVER BOARD
THEORY OF OPERATION (PART FouR)
Sego Pinball continues its ongoing instructional series explaining their newest pinball hard-
ware system: The White Star System .. This issue's installment is on the "Lamp Matrix" circuitry.
TEAM SEGA
Joe Blackwell, Eric Winston
Ted Kil pin, Jay Alfer
Sega Pinball
Melrose Park, Illinois
J12 has 10 Low Side Drivers for
the lamp strobes which consist of
STP19N06L MOSFETS (these
are 19amp / 60volt N-channel
MOSFETS which can also be sub-
stituted with the STP20N10L
MOSFETS used for our Sole-
noid Drive Circuits).
LAMP MATRIX
I
eating a reset condition most
likely due to a communication
problem between the CPU
J13 has 8 High Side Drivers
with each having a status indica-
tor. All the status indicators are
logically 'OR'ed together and fed
back to the CPU Board.
Only one lamp strobe should be
low at any time. The scanning of
the lamp strobes keeps the I/0
Driver Board from resetting.
If the watchdog is not being fed
by the scanning of the Lamp Ma-
trix (more specifically Pin-19
DRV0 of U6 must be toggling
once every 50ms to prevent the
watchdog from resetting) then the
Red LED L204 (on the 1/0
Board) will begin flashing, indi-
The scanning of the Lamp Ma-
trix is controlled by the CPU
Board through Ribbon Cable
Connector J 1.
The status can identify open
loads (for example open lamp
filaments or intermittent connec-
tions) and short circuits.
Board and the I/0 Driver Board
(this could be as simple as the rib-
bon cable being disconnected).
These drivers are also short-cir-
cuit protected. They thermally
sense an over-current condition
and will shutdown the output
while at the same time triggering
the staus line.

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