Play Meter

Frankfort trade fair set
Exhibitors are queuing up to
reserve the limited space still avail-
able in the first specialist trade fair for
amusement and vending machines,
set for January 17-19 in Frankfort,
Germany.
Seventy-five percent of the exhibi-
tion area for the International
Amusement and Vending Trade Fair
· was reserved as of September 1 for
the show , which will feature a
comprehensive display of specialist
vending machines and a strongly
internationalized range of amuse -
ment machines .
Many worldwide market leaders
plan to attend the fair , which will be
held in the spacious 10 ,000 square
meter HaJJI of the exhibition grounds
in Frankfort.
Over 100 companies , including
representatives from the United
States , Great Britain , Japan and
Italy , are involved in pre -show
publicity , that includes the distribu-
bon of specialist visitor invitations to
"ensure that only a high caliber
specialist p ublic (will) visit the fair,"
according to Heckmann G MBH , the
trade fair company organizi ng the
show .
Five thousand visitors are expect-
ed , with a foreign constituent of 20 to
25 percent .
Visitors will receive a trade fair
badge which will identify the partici-
pant's name and country of origin.
:rl.
'Night Rider' testing unit instructions
Since our Night Rider may not
always be in the shop to use as a test
board , I have drawn up plans for a
cute little unit to provide dynamic
testing conditions for Bally's solenoid
driver boards . Readers may request a
copy by writing me at Music Systems
Co ., 3542 Dell Road , Holt , Michigan
48842 .
Here 's how it works and how to
use it:
A simple transformer and bridge
and rectifier circuit provides twelve
volts DC which is supplied to the
board's five -volt regulator . Thus we
can test that regulator circuit . (A test
of the 190 volt supply is not
provided .)
The five volts is then applied to the
board circuits via jumper. Excepting
the flipper relay circuit , each contin-
uous duty solenoid circuit has its own
test button . All it does is ground the
input . The momentary solenoid
circuits are tested by a push button
and a selector switch.
The thumbwheel switch is a
sixteen-position device with positions
numbered 0 through 15. This switch
simply provides the various inputs to
U2 needed to select the sixteen
outputs . The switch numbers cor-
respond to the outputs of U2 as
numbered inside U2 on the schema-
tic . Connectors with LEOs are
provided to indicate circuit opera-
tion .
Using this gadget is simple enough .
Attach the connectors to the ap-
propriate points and you 're ready to
go . Turn the tester on . Now , to test
continuous duty circuits , simply press
the three buttons. To test the
momentary duty circuits , select the
desired output of U2 with the
thumbwheel switch and then press
the button to energize .
If the particular circuit under test is
functioning properly , an LED will
light while the button is pressed . Note
that some of the circuits feed more
than one LED . The orange wire
carries the supply for the LEOs and
must be connected for them to light.
For in -game testing, connect the
tester to J3 and J4 only . Also, you
must jump the ground test point to
the system ground (which is normally
through J3) . The ground braid will
do .
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