4.10 - CPU TESTS
Some
of
-the CPU tests require- the use of the loopback
connectors provided
in
the Diagnostic Kit. These connectors are:
r
1.
MIDlloopback connector
2.
SYNC
IN/OUT loopback connector (also
used
for
CLICK
OUT
/TRIG
IN)
3.
Parallel Computer
(PC)
loopback connector
Starting with the first main menu question displayed
on
the
Front
Panel
LCD,
press the YES,
NO
or
SELECT
switch
in
response
to
the display prompts as follows:
CLR PWR FAIL CNT?
Press
YES
AUTOTEST?
Press
NO
RUN
ALL
TESTS?
Press
NO
FRONT PANEL?
Press
NO
TEST CPU?
Press
YES
ALL
CPU TESTS?
Press
NO
TEST
CPU RAM?
Press
YES
ALL
CPU RAM?
Press
YES
The diagnostic will now proceed
to
test the main
CPU
random
access memory (RAM).
If there is
an
error during the test, a
diagnostic error message
will be displayed
on
the front panel
LCD
indicating the address of the error, the expected (good) data,
and
the
actual
(bad)
data read.
EXAMPLE:
RAM
TEST ERR
A:
1003FF
««
THIS
IS
THE
ADDRESS
GOOD: 55 BAD: FF
If the
RAM
data error occurs, the individual
RAM
tests may
be
run
to
determine the memory chip component number.
Kurzwell
250
Service Manual, Chapter 4
4 - 1 1
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