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Troubleshooting 23
2.3.1 Additional MONO Information
The monochrome video circuits on the system module are disabled when
a graphics module is installed.
If
the system detects a hard error on the
graphics module, then the system reenables the monochrome circuits as a
backup video display and disables the
graphics module's
output.
However,
since the monochrome circuits output signals through
the
BC18P video
cable
instead of the BC19S cable the graphics module uses, the screen remains
blank. Check if the lock LED on the keyboard is lit.
If
so, replace the
graphics module to fix the problem. You can
have a display
on the
monitor
until the problem is fixed by changing the video cable
from
a BCl 9S
to
a
BC18P temporarily.
Appendix E contains the power-up and self-test error codes and Appendix F
contains the system exerciser error codes.
2.4 TEST E -
CLK -
Time-of-Vear Clock
The time-of-year
(TOY)
clock controls the system date and time. The date
and time
cannot be set while the
system
is
iu
console mode. Therefore, the
code
for the TOY clock should always indicate a soft
error
(0000.0005
-
clock
not set)
when the system is
first powered on
after replacing
a system module
or the battery
or before the
operating
system software
is installed.
Self-test
is used
to troubleshoot
the time-of-year
clock
circuits. The
system
exerciser does
not
lest the TOY
clock
circuits.
Enter
TEST
E to run
self-test.
A code of 0000.0001 next to the CLK mnemonic indicates no errors detected
with
the clock
circuits.
Replace
the
system
module
if
any other code is listed
(except
0000.0005 as previously described).
2.4.1 Additional CLK Information
The operating system (VMS or ULTRIX) sets the date and time. Refer to the
operating system documentation to
set
the time.
The TOY clock is
located
on
the
system module. Therefore, the system
module must be replaced whenever the clock
shows
an
error
other than the
clock not set error.
Appendix E contains the power-up and self-test error
codes.
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