HP 87114B, Service Manual

Page: 43 / 174

Figure 2-1. Removing the Handles and Front P anel
2. T o setup 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 . Tighten 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 EXT 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 8711B/12B:
set the analyzer's source frequency to 1.3 GHz by pressing 4 PRESET 5 4 FREQ 5
NNNNNNNN
CW 4 1.3 5
NNNNNNNNNNN
GHz .
If your analyzer is an HP 8713B/14B:
set the analyzer's source frequency to 1.82 GHz by pressing 4 PRESET 5 4 FREQ 5
NNNNNNNN
CW 4 1.82 5
NNNNNNNNNNN
GHz .
4. Measure the voltage at TP11 with respect to ground on the fractional-N board assembly . See
Figure 2-2 for the location.
2-4 Adjustments