IBM 6150 Hardware Maintenance Manual page 244

Step 3
TNL SN20-9843 (03-27-87) to 75X0152 or 75X0166
Be sure that the display power cable is correctly connected to the system
unit.
o
~----------------------.\
-'b'-
0
/ I '
DID YOU FIND A PROBLEM?
YES This completes the repair.
NO Record SRN 26-600, then go to "Step 6" on page 3-6000-6.
(3/87) Problem Isolation Charts
3-6000-3