ADDENDUM
• SELF-TEST DISPLAYS
The self-test check may be executed
at
anytime during
system operation by executing special function 72.
The screens for the different self tests are outlined
below.
If
the self test
is
initiated by a power up, the
destructive RAM test
is
performed first.
It
erases
volatile memory, then stores sequential numbers into
RAM to check for any addressing problems
in
the
RAM.
If
an error
is
detected, the following screen
is
displayed, see Figure 3-41. The operator may enter a "0"
if
he
wishes to proceed even if an error exists.
If
the
operator does not respond in a minute, the testing will
proceed even without an entry.
A NON-VOLATILE MEMORY FAULT
HAS BEEN DETECTED.
CONSULT
THE
OPERATOR'S MANUAL
(PN68P81069A66)
FOR
TROUBLESHOOTING INSTRUCTIONS
FOR CONTINUED OPERATION:
PRESS 0
TO
CONTINUE
PRESS I
TO
RE-INITIALIZE
WITH FACTORY PRESETS
The Test Equipment Service Center should be consulted
to remedy the error.
FIGURE 3-42.
NON-VOLATILE RAM ERROR SCREEN
SELF TEST
After the non-volatile RAM test on power up, or if the
operator initiates a self test with a special function 72, a
checkerboard pattern
is
displayed on the screen, see Fig.
3-43. This serves as a visual check
of
the display to
verify proper alignment
of
the CRT.
FIGURE 3-43. CHECKERBOARD PATTERN
XX
XX
XX
XX
XX
XX
XX
SELF TEST
XX
XX
XX
XX
XX
XX
XX
XX
XX XX
XX
XX
XX
XX XX
XX XX XX
XX
XX
XX XX
XX
XX XX
XX XX
XX XX XX
XX
XX
XX XX
XX XX
XX
xx xx
XX
xx
xx
xx
XX
XX
xx xx
XX
XX XX
xx xx
XX
XX
XX
XX XX
XX
xx
xx
xx
XX
XX
XX
XX XX
XX
XX
XX
*ERROR
IN
VOLATILE
RAM*
PUSH 0 TO CONTINUE
FIGURE 3-41.
DESTRUCTIVE RAM TEST ERROR SCREEN
After the destructive RAM test
is
performed on volatile
memory, then a non-volatile memory check
is
per-
formed to check to see that a bit pattern stored there has
not been corrupted.
If
it has, the following screen
is
displayed, see Figure 3-42.
If
the operator wants to
reinitialize the non-volatile RAM, a "1"
is
entered.
If
the
existing non-volatile memory
is
desired, even though an
error has been detected, a "0"
is
entered.
If
the error per-
sists, the battery on the microprocessor board should be
checked. After a minute, the test will proceed
as
if a "0"
had been entered.
3-21
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