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T
Row Problems.
If a display of two (or more) switch numbers of a row
occurs, although only one switch is closed, check for a short circuit to
ground.
T
Multiple Switch Number lDelleations,
Check for a bad diode on any of the
switches.
T
Column Problems.
If display of two (or more) switch numbers in a column
occurs (while only one switch is actuated), check for a short circuit to
ground or, a bad transistor (Q42-Q49) on the CPU Board.
Use Aura-UP to proceed to the next test.
2.
Switch Edges
From the Switch Levels Test. press ADVANCE. Observe that the Player 1
and 2 displays show the message, SWITCHEDGES: the Player 3 display
shows 07 (Switch Edges Test identifier). The right portion of the Player 3
display is blank, indicating that no switch is actuated.
Thts test permits the operator to test whether actuating a switch provides
the proper signal to the System-llB Switch testing program. When
actuating a switch, the operator should see the switch's name and number
(in the Player 1, 2, and 3 displays, respectively). If no indication appears at
the time the switch is actuated, the operator then mows that there is a
malfunction associated with that switch. Using this technique, the operator
can test each switch appearing in the
GAME SHOW
switch problem
reporting displays (either at game Turn-On or at the beginning of the
Diagnostic Tests) to determine whether the switch can be actuated. If the
switch's name and number are displayed while the operator checks its
operation, the operator then knows that the reported problem with that
Switch is NOT currently caused by a switch malfunction.
The operator can
then seek other causes for the reported problem, being almost certain now
that the switch did not faU. This test is also useful when the operator Is
adjusting the sensitivity of a particular switch's actuation mechanism.
Among the possibilities is the fact that the players have not actuated that
switch because of some other problem: the operator should try to analyze
what could cause the switch to be missed during game play, and remedy
that problem cause. With these new tests, switch problems are, therefore,
more easily isolated.
3.
Playfield or CPU Board?
To determine whether a switch problem is
in the playfield or the CPU Board, remove connectors IP8 and IPlO from
the CPU Board. Begin the Switch Test. Use a Jumper wire to simulate
switch actuation. For example, placing a Jumper between IJlO-9 and IJ8-2
should (based on the Switch-Matrix Table) should produce an indication of
switch 09 being actuated. If only one number is produced for every
simulated switch actuation that occurred then the CPU is good and the
problem is elsewhere.
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Test/Diagnostic Procedures