Agilent Technologies 8564EC Service Manual page 437

6. The rest of the procedure troubleshoots the YTO FM coil driver.
Table 11-14 Settings of Sweep Switches
Switch
U318A
U318B
U318C
U318D
7. Set the spectrum analyzer to the following settings:
Chapter 11
Refer to function block M of A14 frequency control schematic (sheet
2 of 5).
Switch State
Closed
Open
Closed
Open
Center frequency ..................................................... 300 MHz
Span ................................................................................. 0 Hz
Trigger ............................................................ SINGLE, EXT
a. On the spectrum analyzer press
b. Remove A14J23 jumper and connect a dc voltage source to
A14J23 pin 2. Connect the voltage source ground to A14J23 pin 3.
c. Connect a microwave frequency counter or another spectrum
analyzer to the spectrum analyzer 1ST LO OUTPUT. (front panel
output)
d. Set the dc-voltage source output for 0 Vdc and note the 1st LO
frequency.
e. Set the dc-voltage source output for +10 Vdc. The 1st LO
frequency should momentarily increase approximately
+15.6 MHz.
f. The voltage at A14U332 pin 2 should be approximately 19% of
the voltage at A14J23 pin 2.
g. If the 1st LO frequency did not change in step e, press
turn spectrum analyzer off and disconnect W10 from A14J3.
h. Place a jumper between A14J3 pins 9 and 10. Place a 50 Ω, 3 watt
resistor across A14J3 pins 5 and 6 (resistor, part number
0811-1086). Press
i. On the spectrum analyzer, press
Frequency Span Accuracy Problems
Switch Control
Line (Pin #)
1
16
9
8
,
SAVE
to turn spectrum analyzer on.
LINE
RECALL
Synthesizer Section
Control Line
State (TTL)
High
High
Low
Low
,
SAVE STATE STATE 0
LINE
, , .
STATE STATE 0
.
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