Williams Electronics WHIRLWIND - Switch Tests; Switch-Matrix Table

TEST/DIAGNOSTIC PROCEDURES
(Continued)
SWITCH
TESTS.
1.
Switch
Levels.
(From
Solenoid Test) To initiate
the
Switch
Levels Test, press ADVANCE. Observe that
the
upper
display
shows the
message,
SWITCH
LEVELS,
and
the lower display
shows 06 (Switch
Levels
Test identifier). Normally,
the right
portion
of the lower
display remains blank,
indicating
that no
switch
is
actuated.
If,
however,
a
switch
is
actuated (possibly
stuck closed),
the
lower
display
shows that
switch's
number, while
the upper
displays
indicate
the
switch's
name. A sound also accompanies
the
displays.
(This
is
another
facet
of
the
Whirlwind System-11
B's
switch
testing
capability.) If
more
than one
switch
is
closed, a series of
displays
show
each actuated switch's
name
and number.
(In
addition, either of
these
problems
could
result in the reporting of
a switch problem (or
problems)
at
game
Turn-On
or
at the
beginning
of Diagnostic Tests.)
As
soon
as
the operator
opens
a closed
switch,
its
name
and
number are
eliminated from
the
Switch
Levels
display series.
For Whirlwind,
switch
numbers
can range
from 01 through
64.
Refer
to
the
Switch-Matrix
Table for
switch
numbers
and wiring
information.
CPU Board
connections at jacks
1J8
(columns)
and 1J10
(rows) are
also listed
in the table.
WIEUIIRILWIINID Switch-Matrix Table
Row Problems.
If
a
display of
two
(or
more)
switch
numbers Q1_a_LQyy occurs, although
only
one
switch
is
closed, check
for
a
short circuit
between the column
wires.
Multiple
Switch
Number Indications.
Check the associated
column
wire
for
a short circuit
to
ground.
Column
Problems.
lf
display
of
two
(or
more) switch
numbers
1n_a_Qo_|umn
occurs
(while
only
one
switch
is
actuated),
check
for
a short circuit
between
the
row
wires.
Use
AUTO-UP
to
proceed to
the
next
test.
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BL
=
Bottom
Left
BR = Bottom Right TR = Top Right