Agilent Technologies 8564EC Service Manual page 91

Manual Adjustment Procedures
1. IF Bandpass Adjustment
XTAL Bandpass Adjustments
13.On the spectrum analyzer, press
14.Move the positive DVM test lead to A5TP7.
15.On the spectrum analyzer, press
16.Read the voltage displayed on the DVM. If the voltage is less than
17.Repeat steps 15 and 16 until the voltage reads +6.16 Vdc ±100 mV.
If the range for the XTAL CTR adjustment is insufficient, replace the
NOTE
appropriate factory-selected capacitor as listed in
page
XTAL CTR adjustment, and press
IF ADJUST STATUS message disappears, read the DVM display. Choose
a capacitor value from
reading and the presently loaded capacitor value.
lists a few capacitor part numbers.
Turn the spectrum analyzer off by pressing
CAUTION
before removing or replacing any shield.
18.Move the positive DVM test lead to A5TP8.
19.Adjust A5T202 XTAL CTR 2 using the procedure in steps
20.Move the positive DVM test lead to A5TP3.
21.Adjust A5T500 XTAL CTR 3 using the procedure in steps
22.Move the positive DVM test lead to A5TP4.
23.Adjust A5T502 XTAL CTR 4 using the procedure in steps
Table 3-6 Factory-Selected XTAL Filter Capacitors
XTAL CTR Adjustment
A5T200 XTAL CTR 1
A5T202 XTAL CTR 2
A5T500 XTAL CTR 3
A5T502 XTAL CTR 4
114
IF ADJUST STATUS message to disappear before continuing to the
next step.
+6.06 Vdc, turn A5T200 XTAL CTR 1 clockwise. If the voltage is
greater than +6.26 Vdc, turn XTAL CTR 1 counterclockwise.
114. To determine the correct replacement value, center the
Table 3-7 on page
15 through 17.
15 through 17.
15 through 17.
, 1,
SPAN MHz
ADJ CURR IF STATE
ADJ CURR IF STATE
115, based on the DVM
LINE
Fixed Factory Select Capacitor
A5C204
A5C216
A5C505
A5C516
, and .
CAL
. Wait for the
Table 3-6 on
. After the
Table 3-8 on page 115
to the off position
Chapter 3