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Troubleshooting
A22 Radiated Filter Board Assembly Troubleshooting
A22 Radiated Filter Board Assembly Troubleshooting
The A22 Radiated Filter Board Assembly is serviced as an assembly only; no
component level repair is supported. For details on the functionality of this
assembly see
Chapter 3, "Assembly
Descriptions". Refer to
Chapter 4 , "Block
Diagrams"
for details.
RF Filtering above 30 MHz
The main function of the A22 Radiated Filter board assembly is to provide filtering
for signals above 30 MHz. Low signal levels and bad filter shapes may be
corrected by running one or more of the instrument adjustments.
To measure the RF filter shapes connect either a network analyzer or a signal
analyzer with a tracking generator from the RF INPUT to the RF OUTPUT of the
instrument.
Filter selection and tuning can be controlled through the use of the instrument
Service menu. See
Chapter 5 , "Service and Diagnostics Menus," on page 121
for
details.
If further fault isolation is needed the response can also be measured directly on
the A22 Radiated Filter board, from A22-J803 to A22-P1. (Refer to
Figure 2-18
and
Figure
2-19) In order to measure the signal in this manner first remove the A21
Radiated Input board assembly and the A21 Radiated Filter board assembly and
then remove cable W13. Replace the A21 Radiated Input board assembly and the
A21 Radiated Filter board assembly. Using one of the Type-M troubleshooting
cables (N9039-60034) connected to A22-J803, you may now measure the
frequency response from A22-J803 to A22-P1.
Refer to
Figure 2-20
through
Figure 2-30
for filter shape examples.
Chapter 2
75
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Troubleshooting
