4.26 - CPU TESTS
Some
of
the CPU tests require
the
use
of
the loopback
connectors provided
in
the Diagnostic Kit. These connectors are:
t
1. MIDlloopback connector 0
2. SYNC IN/OUT loopback connector (also used for CLICK OUT
/TRIG IN)
3.
Parallel Computer
(PC)
loopback connector
IF YOU UNIT HAS QLS DO NOT USE THE
PARALLEL
COMPUTER LOOPBACK CONNECTORI
Starting with the first
maion
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. After each
memory test questions, a
LOOP ON
TEST?
question is asked. If
YES
is
the
resp~nse,
the test will repeat until
SELECT
is
pressed or
an
error is detected.
Kurzwell 250 Service Manual, Chapter 4
4-
40
To Next Page
Loading...
