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tI
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.
tI
Multiple Switch Number Indications.
Check for a bad diode on any of the
switches.
tI
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·g49) on the CPU Board.
Use AUTO·UP to proceed to the next test.
2. Switch Edges
From the Switch Levels Test. press ADVANCE. Observe that the Player I
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.
This test permits the operator to test whether actuating a switch provides
the proper signal to the System-lIB 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), Ifno indication appears at
the time the switch is actuated. the operator then knows that there is a
malfunction associated with that switch.
Using this technique. the operator can test each switch appearing in the
ELVIRA
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 fail. 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 IJIO·9 and IJ8-2 should (based on the Switch-Matrix
Table) should produce an indication of switch 09 being actuated.
1-40 Test/Diagnostic Procedures