IBM RT PC Problem Determination Manual page 53

Step 16. Keyboard Lights, Beeper, or Two-Digit Display Failure
1. Get a Problem Summary Form from Appendix B of this manual.
2. Find the failing component in the following table.
3. Write the Service Request Number (SRN) for the failing
component on item 4 of the form.
4. Have the failing device serviced.
Failing Com ponent
Keyboard Lights
Beeper
Two-Digit Display
STOP. You have found the problem.
SRN Device to be
Serviced
Keyboard
36-780
36-780-100 Keyboard
System Unit
16-630-84A
Section 2. Hardware Problems 2-25