IBM 6151 Maintenance And Service Manual page 159

Step 27
The checkout routines ran correctly.
Each of the following problems are related to particular SRNs.
Check the system for the following problems:
• The indicators on the keyboard are not working (check during
power-on self-test).
• The speaker in the keyboard is not working or sounds
continually (check during power-on self-test).
• The two-digit display fails to display correctly (check at the
start of power-on self-test). The power-on self-test program
displays 88 at the start of the test to check the two-digit display.
DID YOU FIND ONE OF THE ABOVE PROBLEMS?
YES Record the corresponding SRN for the problem.
• The indicators on the keyboard are failing, record
16-780.
• The two-digit display is failing, record 16-630-84A.
• The speaker in the keyboard is failing, record 16-780-100.
Go to "Step 33" on page 3-0030-33.
NO
Continue on the next page.
(6/88) Problem Isolation Charts 3-0030-27