Watkins-Johnson Company WJ-8718-19/FE Instruction Manual page 216

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vvd-o< 10-13/ re nr a l u l i v en. MAINTENANCE
4.3.6.2.3 2nd LO Filter Adjustment
1. Deenergize the receiver.
2. Remove plug P13 from A5XA2-B15/16.
3. Connect the RF Voltmeter and 50 ohm adapter to
A5XA2-B15 using a coaxial cable with clip leads on one
end. Connect cable ground lead to the A5 motherboard
ground plane.
3. Set Voltmeter to 0 dBm (0.3 mV) scale and energize the
receiver.
4. Adjust A5C13 for maximum Voltmeter reading. A5C13 is
located on the bottom side of the Synthesizer
Motherboard (A5) near the front panel of the receiver.
4.3.6.2.4 3rd LO Synthesizer, p/o A5A1, (p/o 791630) Alignment
1. Deenergize the receiver.
2. Mount the 1st and 3rd LO Synthesizer (A5A1A2) on
extender cards and connect the Digital Voltmeter to Pin
8 of U22.
3. Energize the receiver. Adjust capacitor C33 until a
reading of 3.0 Vdc is seen on the Voltmeter.
4. Deenergize the receiver and disconnect Digital
Voltmeter.
4.3.6.2.5 2 MHz Time Base, p/o A5A1, (p/o 791630) Adjustment
NOTE
Before performing the following adjustment, the
receiver should have been in operation for at
least one hour at normal operation temperature
to allow the circuit to stabilize.
1. Deenergize the receiver.
2. Mount 1st and 3rd LO Synthesizer (A5A1A2) on
extender cards.
3. Connect the Digital Counter to rear panel 1 MHz Ref
connector Jll.
4. Set the Clock switch S2 to INT position.
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