Installation guide

Troubleshooting
Troubleshooting Assembly Level Problems
1-57
1500 Power Supply
• If the supply voltages are good on the connector pins indicated:
a. Turn power off to the signal generator.
b. Remove the A9 Digital Demodulator (Option 501, 502, 503, 504 with Option 300) and ohm the
connection between the appropriate pins of J12/J2, and sockets J12/J2.
— If the connection is good,
replace the A9 Digital Demodulator (Option 501, 502, 503, 504 with Option 300).
(Refer to “A9 Digital Demodulator (Option 501, 502, 503, 504 with Option 300)” on page 2-24.)
— 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.