Reflex Service Manual
Performance Verification
RAM
Test
Several
tests
that
get
performed
on the
SRAM
(U9)
in
the
system.
First,
the
RAM
is
filled with
the value
55
hex
(0101
0101
binary), then
each
memory
location is read
to see
if
it
contains
55.
If
55
is in the
memory
location,
the
location is
filled
with
AA
hex
(1010
1010
binary),
and
the next
location
is
processed.
Once
the
RAM
has been checked
for
55’s
and
filled with AA’s, the
process is repeated,
checking
for AA’s and storing O’s.
Then,
the
memory is
checked
for
O’s
and the
test
exits.
WCS Test
The
WCStest is
identical
to the
SRAM
test except
that it is
run on the
program
memory
space
in the Lexichip
2
(U14).
Interrupt Test
This
test
verifies that the
NMI
Interrupt
is
working,
and that
it
occurs
at
the
proper
intervals. The interrupt
is
allowed
to
run
for
a
period of time that
should
allow
20 interrupts.
A
count of the interrupts is
kept and
compared
for
overshoot and undershoot. More than
21
interrupts means
the
interrupt is
too
short. Fewer than 19 interrupts means
it’s too
long.
Note that
the
User
Diagnostics
allow you to
distinguish overshoot
and
undershoot.
User
Diagnostics
The
User
Diagnostics provide more interactive
access
to
the
tests
run by
the
Power
Up
Diagnostics, and also
provide
access to
tests,
troubleshooting
tools
and system
configuration
tools
not available from
the
normal
operating
system.
NOTE:
As
User Diagnostics
must operate
within
the
limits of
the
front
panel
controls, it is not always readily apparent
to a
casual observer
what
the current
mode
of the
system
is. Care should
be
taken
to
keep track of
where
you
are
and
how
you got
there.
Accessing User Diagnostics
To
access
User Diagnostics, press and hold the
STORE/CLEAR
and
PA-
RAMETER/LEARN
buttons
during
power
up.
The
letter d
appears
on the
display
to
indicate
you
have entered
User
Diagnostics. Release
the
buttons
and
wait
approximately one
second.
To begin using the
diagnostics,
press
STORE/CLEAR,
PARAMETER/LEARN
or
REGISTER/PRESET.
The
Diagnostics Menu
The
User
Diagnostics contain
21
tests
and tools.
Turn the
REGISTER/
PRESET
knob
to
select sixteen of these menu items, each
of
which
has
a
displayed
ID number.
Execute any displayed item
by
pressing
STORE/
CLEAR.
PARAMETER/LEARN
orthe REGISTER/PRESET
button.
An
addi-
tional
five
menu items
are
selected in
an
“Alternate
Mode”. Access
this mode
by
continuously
holding
down PARAMETER/LEARN.
In
this
mode,
the
decimal
point will
light. While holding
down
PARAMETER/LEARN,
turn the
REGISTER/PRESET knob
to select an item
and press
the
STORE/CLEAR
or
REGISTER/PRESET
button
to
execute
any
displayed item.
3-7
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