IBM 5155 Manual To Operations page 177

Test 9000
If
your mM Color Display requires service, it must be
returned with the power cord.
1
Set the Power control to On.
Power Control
2
Is the Power-On indicator lit?
bd
.
Power·On Indicator
•
CI
•
YES -
Go to the next step.
NO - Check that the power cord is plugged
into a functioning wall outlet and into
the rear of the display. If so, have the
display serviced.
January 1984 Test 9000-1