IBM 6151 Maintenance And Service Manual page 363

IBM 6155 Extended Monochrome Graphics Display
PIC 6200
Use this PIC to get an SRN when there is a problem that prevents
you from reading the display screen easily, the two-digit display is
blank, and the power-on indicator is on.
Step 1
Be sure the Power On and Brightness Control is set to On.
IBM
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Contra" Control
Power On and Brlghtne.. Control
AJZB208
IS THE DISPLAY POWER-ON INDICATOR ON?
NO Go to "Step 4" on page 3-6200-4.
YES Continue on the next page.
(6/88) Problem Isolation Charts 3-6200-1