IBM 6150 Hardware Maintenance Manual page 291

TNL SN20-9843 (03-27-87) to 75X0152
Step 2
1. Set the power switch on the system unit to Off.
2. Exchange the adapter for the fixed-disk and diskette drives.
3. Be sure the power has been off 30 seconds, then set the power switch
on the system unit to On.
4. Wait 2 minutes, then answer the following question.
cf
e
IS "23" DISPLAYED IN THE TWO-DIGIT DISPLAY?
NO Set the power switch on the system unit to Off, then go to "Step
4" on page 3-9840-4.
YES Set the power switch on the system unit to Off.
1. Exchange the system board.
2. Go to "Step 4" on page 3-9840-4.
3-9840-2 Service Manual