TEST U67 TIMER 1? Press
YES
If a test errror occurs a diagnost'ic error message will be
r-
.
displayed
on
the 'front panel LCD display. If
no
error occurs, proceed
with the following.
Press
SELECT
to
exit the
CPU
tests.
4.27 -
POWER FAIL TEST
To
check the power fail interrupt logic
on
the CPU board:
CLR
PWR
FAIL CNT? Press
YES
Turn
off system power, then turn
on
system power.
Press
SELECT
CLR
PWR
FAIL CNT? Press
NO
COUNT: 1
The
CO
U
NT
indicates the number
of
times a power fail
interrupt was detected by the CPU. Cycling the power off then
on
several more times and answering NO
to
the CLR PWR FAIL CNT
prompt should increment the count by one each time.
If the count
does not increment by one, there may be a problem with the
CPU
interrupt logic or the battery-backed RAM.
Kurzweil 250 Service Manual, Chapter 4
4 - 4 6
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