IBM 6151 Maintenance And Service Manual page 341

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Step 3
1.
Set the power switch on the system unit to On.
2. If attached, set the power switch on the RT PC 6192 to On.
3. Wait about 4 minutes.
4. Try to set the Power On and Brightness Control to the desired
level; then answer the following question.
IBM
11---'---'----,
AJZB204
WERE YOU ABLE TO ADJUST THE BRIGHTNESS
CONTROL TO THE DESIRED LEVEL?
YES Go to "Step 5" on page 3-5900-5.
NO Record SRN 26-590-450, the go to "Step 7" on page 3-5900-7.
(6/88) Problem Isolation Charts 3-5900-3