Chapter 10 511
Synthesizer Section
Synthesizer Troubleshooting Section
16.Tune the source to 1 kHz less than the fractional N frequency. The
voltage measured on the DVM should be approximately 12 Vdc.
17.Tune the source to a frequency 1 kHz greater than the fractional N
frequency. The voltage measured on the DVM should be
approximately −12 Vdc.
18.If the DVM reading does not change, the A14 frequency control
assembly is defective. Reconnect W32 to A14J501.
Figure 10-1 YTO Loop Test Setup
Check A15 RF assembly (steps 18-25)
19.Disconnect W34 from A15U100J1 and disconnect W32 from
A15J101.
20.Connect a frequency counter to A15J101. Connect a high-frequency
test cable from an HP 8340A/B synthesized sweeper to A15U100J1.
See Figure 10-2 on page 512.
21.Connect a BNC cable from the HP 8560E/EC 10 MHz REF IN/OUT
to the HP 8340A/B FREQUENCY STANDARD EXT input.
22.Set the HP 8340A/B to the following settings:
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