Installation guide

Troubleshooting
Troubleshooting Assembly Level Problems
1-55
1400 Power Supply
• If the supply voltages are good on the connector pins indicated:
a. Turn power off to the signal generator.
b. Remove the A11 Internal Bit Error Rate Analyzer (Option UN7) and ohm the connection between the
appropriate pins of J14/J4, and sockets J14/J4.
— If the connection is good, replace the A11 Internal Bit Error Rate Analyzer (Option UN7).
(Refer to “A11 Internal Bit Error Rate Analyzer (Option UN7)” on page 2-28.)
— If the connection is bad, replace the A23 Motherboard.
(Refer to “A23 Motherboard” on page 2-52.)
• If the supply voltages are bad on the connector pins indicated:
a. Check the origin of the supply.
— If the supply voltage is good at the origin, replace the A23 Motherboard.
(Refer to “A23 Motherboard” on page 2-52.)
— If the supply voltage is bad at the origin, troubleshoot the problem using that assembly's
troubleshooting procedure.