432 Chapter9
IF Section
Troubleshooting Using the Diagnostic Software
6. Select the 10 kHz sweep width in the software menu. The display on
the second spectrum analyzer should be similar to that shown in
Figure 9-4 on page 433.
7. Select the 4 kHz sweep width in the software menu. The display on
the second spectrum analyzer should be similar to that shown in
Figure 9-5 on page 434.
8. Select the 2 kHz sweep width in the software menu. The display on
the second spectrum analyzer should be similar to that shown in
Figure 9-6 on page 434.
9. If the cal oscillator is not sweeping, check the output of the sweep
generator circuit (A4U804 pin 8 of function block Z). A series of
negative-going parabolas should occur. Frequency and amplitude
vary, depending on the sweep width chosen. Table 9-1 lists the
RANGE, MA0, and MA1 values for the sweep widths.
Table 9-1 Sweep Width Settings
Sweep
Width
Sweep
Time
Res BW
Adjusted
RANGE
A4U105
Pin 6
MA1
A4U105
Pin 2
MA0
A4U105
Pin 5
20 kHz 5 ms 10 kHz +5 V 0 V 0 V
10 kHz 10 ms 3 kHz +5 V 0 V +5 V
4 kHz 30 ms 1 kHz +5 V +5 V 0 V
2 kHz 15 ms 300 Hz +5 V +5 V +5 V
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