Agilent Technologies 8711C Service Manual page 48

Insert artwork here.
2. o set up the service extender board for adjusting the fractional-N board assembly, follow
these steps (see also Figure 4-2):
a. Remove the backplane cover from the rear panel of the analyzer by unscrewing the two
hold-down screws and sliding the cover toward the power-cord receptacle.
b. Attach the service extender board by reversing step (a) with the lower extender board
assembly. ighten the two hold-down screws securely.
c. Place an antistatic mat on top of the analyzer.
d. Remove the two SMB cables from the fractional-N/reference assembly. Remove the nut
on the rear panel EX REF BNC connector.
e. Use the handle tab to loosen the assembly, then pull the board assembly out of the
analyzer. Attach the fractional-N/reference assembly backplane connector to the upper
extender board.
f. Reconnect the SMB cables. If necessary, use the longer SMB cables provided in the
service kit.
3. Switch ON the analyzer's line power.
If your analyzer is an HP 8711C/12C:
set the analyzer's source frequency to 1.3 GHz by pressing
If your analyzer is an HP 8730A:
set the analyzer's source frequency to 1.3 GHz by pressing
page 2-2)
MEAS1
5
If your analyzer is an HP 8713C/14C:
set the analyzer's source frequency to 1.82 GHz by pressing
4. Measure the voltage at P11 with respect to ground on the fractional-N board assembly. See
Figure 2-2 for the location.
Figure 2-1. Removing the andles and Front Panel
Transmissn CW
REQ
5
PRESET
PRESET
.
GHz
1.3
5
PRESET
CW GHz
REQ 1.3
5 5 5
(see the cautions on
5
CW GHz
REQ 1.82
5 5 5
Adjustments
.
.
2-5