Basic HTML Version
Use AurO-UP to proceed to the next test.
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 Indications. 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.
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 06 (Switch Edges Test identifier). The light 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-IIC switch testing program. When
actuating a switch, the operator should see the switch's name and number
(in the Player I, 2, and 3 displays, respectively). If no 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
RADICAL!
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 isola ted.
3. Playfield or CPU Board?
To determine whether a switch problem is
in the playfteld 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. If only one number is produced for every
simulated switch actuation that occurred then the CPU is good and the
problem is elsewhere.
1-40 Test/Diagnostic Procedures