Installation guide

Troubleshooting
Troubleshooting Assembly Level Problems
1-31
100 Power Supply
• If the power supply voltages are good on the connector pins indicated:
a. Remove the A10 I/Q Multiplexer and ohm the connection between the appropriate pins of J3/J13 (A23
Motherboard side) and sockets of J3/J13 (A10 I/Q Multiplexer side).
b. If the connection is good, replace the A10 I/Q Multiplexer.
(Refer to “A10 I/Q Multiplexer” on page 2-26.)
c. If the connection is bad, replace the A23 Motherboard.
(Refer to “A23 Motherboard” on page 2-52.)
• If the supply voltages are bad on any of the connector pins indicate:
a. Check the origin of the power supply.
b. If the power supply voltages are good at the origin, replace the A23 Motherboard.
(Refer to “A23 Motherboard” on page 2-52.)
c. If the power supply voltages are bad at the origin, troubleshoot the problem using the assembly’s
troubleshooting procedure.
101 Cal Source
• Replace the A10 I/Q Multiplexer.
102 ExtIn Offset DAC and Switch
• Replace the A10 I/Q Multiplexer.
103 Path1&2 and ExtOut
• Replace the A10 I/Q Multiplexer.
104 Path1 Atten+Summing Amp
• Replace the A10 I/Q Multiplexer.
105 Path2 Atten+Summing Amp
• Replace the A10 I/Q Multiplexer.
106 DC-Coupled Mode Test
• Replace the A10 I/Q Multiplexer.
107 Drift Canceller Test
• Replace the A10 I/Q Multiplexer.
108 IQ Polarity Switch
• Replace the A10 I/Q Multiplexer.
109 RMS to DC Conv Test
• Replace the A10 I/Q Multiplexer.