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22 Troubleshooting
7. Remove the memory module from the system module.
8.
Power
up the system
with the memory
module
disconnected.
H the system
has
no
video display, the problem
is not the memory module, proceed
to
step
8.
H
the system
has a
video
display,
replace the memory module
and
retest the system.
9.
Power
down the
system. Replace
the
system module and power
up the
system
again. H
the system still has
no
video
display after replacing
the
system
module, replace
the
power supply.
2.2.2 Additional Information on Nonoperatlng Systems
When a monochrome monitor is used with
a
graphics module installed
(BC19S
video
cable is used), a 75-oiun
terminator
(PN
29-26899-00) must
be
connected on
the red and blue
leads of
the
video
cable
when
testing lhe
graphics
option (TEST 4). The green lead is plugged into the video input
connector
on
the monochrome monitors.
Appendix
E
contains the power-up
and self-test error codes and Appendix
F contains
the system exerciser error
codes.
2.3 TEST F- MONO- Monochrome Video Circuits
The system
module
contains the monochrome
video circuitry necessary
to
sl.lpport
graphics displays
on a
monitor when an 8-plane graphics module is
not
installed. This section descibes how to test these
monochrome
circuits on
the
system module. This procedure does not troubleshoot
the
video monitor or
the 8-plane
graphics module. The
system
module must
be
replaced
whenever
any
error
(soft or hard)
is
detected on the monochrome
circuits.
Self-test
and the system
exerciser
are
used to
troubleshoot the
monochrome
video
circuits. Enter
TEST
F to run self-test. Then enter
TEST
SO
to
see
the
results or enter TEST 0 for customer mode system exerciser.
A
code
of 0000.0001
next to
the
MONO mnemonic indicates
no errors detected
with the
monochrome
circuits.
Replace lhe
system
module
if
any
other
code
is listed.
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Troubleshooting
