IBM 6151 Maintenance And Service Manual page 334

Step 4
Turn the Brightness Control fully counter clockwise.
Power-On
Indicator
II';;D~I-
__
---:/--power
Switch
1/"H,~-----:;"L~
Contrast
,,"....... Control
Brightness
Control
AJZR!97
IS THE SCREEN DARK?
NO
Record SRN 26-580; then go to "Step 7" on page 3-5800-7.
YES Continue on the next page.
3-5800-4 Service Manual