1. 4 Troubleshooting
1.4.2
Power-Up BIT Diagnostics
The
green
LED
on
the RIPL board
serves
two
purposes:
to
show initia-
tion of the
RIPL
BIT:
and
to
indicate
the board's
status
(i.e., whether the
board is functioning properly).
RIPL
board diagnostics are contained
on
a PROM resident
on
the board.
When the
UPCC
system is powered-
up,
the RIPL diagnostics are initiated.
During power-up, the RIPL board LED
should illuminate continuously
for
two
to
three seconds.
After
successful
BIT
completion,
the
LED will begin
blinking
at
a rate
of
one
flash per half-
second. LED flashing will continue as
long
as power
to
the
UPCC
is not
interrupted
and
the RIPL board is
functioning properly. If the LED does
not
enter
the flashing
state
after
completion of the
BIT,
the RIPL board
should
be
replaced.
NOTE
The
RIPL
BIT
can
be
run continuously
by
setting switch number 1 0
on
the
RIPL
board
S\Nitch
bank
SW1
to
the
ON
position.
The
RlPL
LED
[green) will
blink
rapidly, indicating
that
the board
is cycling through the
BIT
repeatedly.
[Continuous running of the BIT might
be
used when testing
for
intermittent
problems.)
741-1859
Page
1-12
UPCC
e END
COMPANY CONFIDENTIAL
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