IBM 6150 Hardware Maintenance Manual page 165

TNL SN20-9850 (05-87) to 75X0152 or 75X0166
Step 6
Look at the SRN.
4. Write the Service Request Number here:
1L -
23Lf - 100
-133if -
1)
"if
IS THE PROCEDURE NUMBER A "I"?
NO Go to "Step 9" on page 3-0060-9.
YES Continue on the next page.
3-0060-6 Service Manual