HP 8562E, Service Manual

Page: 64 / 482

3. IF Adjustment
If the range for the XTAL CTR adjustment is insufficient, replace the
appropriate factory-selected capacitor as listed in Table 2-8. To determine
the correct replacement value, center the XTAL CTR adjustment, and press
IF STATE.
After the
IF ADJUST STATUS
message disappears, read
the DVM display. Choose a capacitor value from Table 2-9, based on the
DVM reading and the presently loaded capacitor value. Table 2-10 lists a few
capacitor part numbers.
Turn the spectrum analyzer off by pressing to the off position before
removing or replacing any shield.
18. Move the positive DVM test lead to
19. Adjust XTAL CTR 2 using the procedure in steps 15 through 17.
20. Move the positive DVM test lead to
21. Adjust XTAL CTR 3 using the procedure in steps 15 through 17.
22. Move the positive DVM test lead to
23. Adjust XTAL CTR 4 using the procedure in steps 15 through 17.
Table 2-8. Factory-Selected XTAL Filter Capacitors
XTAL CTR Adjustment Fixed Factory Select Capacitor
XTAL CTR 1
XTAL CTR 2
XTAL CTR 3
XTAL CTR 4
Table 2-9. XTAL Factory-Selected Capacitor Selection
DVM Reading (V)
Currently Loaded Capacitor Value
Replace Replace Replace Replace Replace Replace
15 with: 18 with: 20 with:
22 with: 24 with: 27 with:
0 to 1.5
* * * *
* *
1.5 to 2.5
27
* * * *
*
2.5
to 3.5
22 27
27 * * *
3.5 t o 4.5
18 22 24
27 27 *
4.5 t o 5.5
18 20
22 24 27
*
5.5 to 6.5
No change No change No change No change No change No change
6.5
to 7.5 No change No change No change No change No change No change
7.5 to 8.5 *
15 18 18 22
24
8.5
to 9.5 * 15
15 18
20 24
9.5 to 10
* *
15 18 20
24
* Indicates a condition that should not exist; suspect broken hardware.
2-24 Adjustment Procedures