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31 March, 1997
7.5 LCD DISPLAY ERROR
LCD display error
Blank characters
Yes
Check FCU-OPU harness
No
Fixed ?
Yes
Replace FCU-OPU harness
Disconnect FCU-OPU harness
from OPU
Check for periodical pulse at pin 4
using oscilloscope
(signal 'opsd' from FCU)
No
Pulse?
Yes
Replace FCU
Replace OPU
Power on test
No
Check FCU-PSU harness
Check FCU-OPU harness
Yes
H905T005.vsd
7-5
LCD DISPLAY ERROR
No
No change in LCD
(as if no power)
Yes
Fixed ?
No
Check PSU output
(+24V, 5V, -12V)
Fixed ?
No
Disconnect FCU-OPU harness
from OPU, check pin 6 (/Reset)
from the FCU using an
Yes
oscilloscope
Replace PSU
'Low' ?
Yes
Replace FCU
Abnormal characters
in LCD
No
Replace OPU
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