Agilent Technologies 856290216 Xtal Bandpass Adjustments, Factory-Selected LC Filter Capacitors

3. IF Bandpass Adjustment

11.Move the positive DVM test lead to A5TPl (this is a resistor-lead type of test point).

12.Adjust A5L702 LC CTR 4 using the procedure in steps 4 through 6.

Table 2-6. Factory-Selected LC Filter Capacitors

			LC CTR Adjustment			Fixed Factory Select Capacitor
			A5L300 LC CTR 1				A5C326
			A5L301 LC CTR 2				A5C327
			A5L700 LC CTR 3				A5C717
			A5L702 LC CTR 4				A5C718
		Table 2-7. LC Factory-Selected Capacitor Selection
DVM Reading (V)				Currently Loaded Capacitor Value (pF)
		Replace		Replace	Replace		Replace	Replace	Replace	Replace
		6.8 with:		8.2 with:	10 with:		12 with:	15 with:	18 with:	20 with:
0 to 1.5		*		*	*		*	*	*	*
1.5 to 2.5		18		18	*		*	*	*	*
2.5	to 3.5	15		15	18		18	*	*	*
3.5	to 4.5	10		12	15		15	18	*	*
4.5	to 5.5	8.2		10	12		15	18	*	*

5.5to 6.5 No change No change No change No change No change No change No change

6.5to 7.5 No change No change No change No change No change No change No change

7.5 to	8.5	*	6.8	8.2	10	12	15	18
8.5 to	9.5	*	*	6.8	8.2	12	15	18
9.5 to 10		*	*	6.8	8.2	10	12	15

* Indicates a condition that should not, exist; suspect broken hardware.

XTAL Bandpass Adjustments

13.On the spectrum analyzer, press ISPAN), 1, (MHz), and ICAL).

14.Move the positive DVM test lead to A5TP7.

15.On the spectrum analyzer, press AIIJ CVRR IF STATE. Wait for the IF ADJUST STATUS message to disappear before continuing to the next step.

16.Read the voltage displayed on the DVM. If the voltage is less than $6.06 Vdc, turn A5T200 XTAL CTR 1 clockwise. If the voltage is greater than i-6.26 Vdc, turn XTAL CTR 1 counterclockwise.

17.Repeat steps 15 and 16 until the voltage reads t6.16 Vdc flO0 mV.

Adjustment Procedures 2-23