602 Chapter12
RF Section
A7 LO Multiplier and Distribution Amplifier
A7 LO Multiplier and Distribution Amplifier
NOTE YTO unlock errors may occur if the power delivered to the A15U100
sampler is less than −9.5 dBm. Frequency response will be degraded in
both internal and external mixing modes if the output power is low or
unlevelled.
CAUTION Connecting or disconnecting the A7 bias with the spectrum analyzer
power turned on will destroy the A7 assembly. Always press
LINE to
turn the spectrum analyzer off before removing or reinstalling W12 to
either the A7 or A14J10.
NOTE ERR 334 may be displayed if the LO OUTPUT connector on the front
panel is not properly terminated into a 50Ω termination.
Figure 12-3 A14J10, Solder Side of A14 (Ignore Pin Numbers on Mating
Connector)
1. Press
LINE to turn the spectrum analyzer off. Disconnect W12 from
A14J10.
2. Connect a jumper between A14J10 pin 5 and A14J19 pin 6. Connect
a jumper between A14J18 pin 13 and A14J18 pin 1. See Figure 12-3
on page 602.
3. Connect the positive lead of a DVM to A14J18 pin 14 and the
negative lead to A14J18 pin 6.
4. Press
LINE to turn the spectrum analyzer on.
5. The voltage measured on the DVM should be more negative than
−9.4 Vdc.
6. Move the jumper from A14J18 pin 1 to A14J18 pin 2. The voltage
measured on the DVM should be more positive than +12.3 Vdc.
7. If the voltages do not meet the limits listed in steps 5 and 6,
troubleshoot the A14 frequency control assembly.
8. Connect the positive DVM lead to A14J10 pin 1.
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