TARGET INTERFACE BOARD
new switch matrix design requires a new target interface
board. The target interface board reads the 19 conductors
from the switch matrix and transfers it to the main board. For
troubleshooting purposes it is important to know which pins on
the target interface board will
a particular score. Thii
information is listed in Table 1 and shown in Figure 12.
the game in Test mode (at the end of test when
sensitive) or in game mode, pairs of pins can be shorted and
opened with a jumper to simulate a dart hit (see
11).
This procedure
help determine whether a scoring problem
is in the switch matrix or the game electronics.
SCORE WILL NOT REGISTER UNTIL
THE JUMPER WIRE IS REMOVED FROM ONE OF
THE PINS.
lf a game has a stuck segment, it can be opened electrically by
disconnecting the 19 pin ribbon. The stuck segment’s score
then register, and the
can be checked for the cause
of the problem. Another method of opening the switch is to
disconnect the ribbon cable
the Main
Figure 11
Figure 12
SWITCH MATRIX TEST CHART
I N N E R
remove the
and
release. The LED
should
flash
and the game
should score as If
PIN
T4
1
7
1
8
1 9
O S 1
Table 1 .
