Installation guide

Troubleshooting
Troubleshooting Assembly Level Problems
1-53
1100 Power Supply
• Run the Self-Test to verify that the A12 CPU is receiving the following power supplies: +10 V Ref,
−6VRef, −5.2 V Ref, and the +9 V Ref.
— If the power supply voltages are correct on the J15 and J5 connector pins indicated:
a. Ohm the connection between the connectors J8 and J15, or J7 and J5.
— If the connection is good, replace the A12 CPU.
(Refer to “A12 CPU” on page 2-30.)
— If the connection is bad, replace the A23 Motherboard.
(Refer to “A23 Motherboard” on page 2-52.)
— If the power supply voltages are incorrect on the J15 and J5 connector pins indicated:
a. Check the origin of the power supply.
— If the power supply voltages are good at the origin, replace the A23 Motherboard.
(Refer to “A23 Motherboard” on page 2-52.)
— If the power supply voltages are bad, troubleshoot the problem using the assembly’s
troubleshooting procedure.