Agilent Technologies 4352B, Service Manual

Page: 158 / 293

25. Press 4
1
5 , 4
2
5 , 4
x1
5 to set the FREQ BUS to 12 [A6] REF LOOP .
26. Conrm that the marker reading value is within the range of 39.6 mU to 40.4 mU .
If it fails , replace the A6 spectrum analyzer assembly .
If it passes , continue with the next step .
27. Press 4 1 5 , 4 3 5 , 4 x1 5 to set the FREQ BUS to 13 [A6] FIXED PLL.
28. Conrm that the marker reading value is within the range of 198 mU to 202 mU .
If it fails , replace the A6 spectrum analyzer assembly .
If it passes , continue with the next step .
29. Press 4
1
5 , 4
4
5 , 4
x1
5 to set the FREQ BUS to 14 [A6] FN LOOP .
30. Conrm that the marker reading value is within the range of 2.475 U to 2.525 U .
If it fails , replace the A6 spectrum analyzer assembly .
If it passes , continue with the next step .
3. Check A5 2nd PLL
P erform the following steps to check the A5 2nd PLL by DC BUS/FREQ BUS functions .
1.
Press 4 Preset 5 , 4 System 5 ,
N
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SERVICE MENU ,
N
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SERVICE MODES ,
N
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
BUS MEAS [OFF] ,
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
FREQ BUS [OFF] , 4
1
5 , 4
x1
5 ,
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
BUS MEAS on OFF to set the FREQ BUS to 1 [A5] 2nd LOCAL.
2.
Press
NNNNNNNNNNNNNNNNNNNN
RETURN ,
NNNNNNNN
A5 ,
NNNNNNNNNNNNNNNNNNNNNNN
2nd PLL ,
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
PLL MODE: SINGLE ,
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
PLL BW: WIDE ,
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
PLL REF: FIXed ,
NNNNNNNNNNNNNN
MORE . Conrm that the PLL OFST setting is OFF (
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
PLL OFST on OFF ).
3.
Press
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
2nd PLL DIVIDER , 4 3 5 , 4 8 5 , 4 x1 5 .
4. Conrm that the marker reading value at the upper right corner is 1.1875 U 6 0.0001 U .
If it fails , replace the A5 2nd PLL assembly .
If it passes , continue with the next step .
5.
Press
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
2nd PLL DIVIDER , 4 6 5 , 4 2 5 , 4 x1 5 .
6. Conrm that the marker reading value at the upper right corner is 1.9375 U 6 0.0001 U .
If it fails , replace the A5 2nd PLL assembly .
If it passes , continue with the next step .
7.
Press
N
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
PLL OFST on OFF to set PLL OFST to ON.
8.
Press
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
2nd PLL DIVIDER , 4
4
5 , 4
8
5 , 4
x1
5 .
9. Conrm that the marker reading value at the upper right corner is 1.5050 U 6 0.0001 U .
If it fails , replace the A5 2nd PLL assembly .
If it passes , continue with the next step .
10.
Press 4 Preset 5 , 4 System 5 ,
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SERVICE MENU ,
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SERVICE MODES ,
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
BUS MEAS [OFF] ,
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
FREQ BUS [OFF] , 4 2 5 , 4 x1 5 ,
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
BUS MEAS on OFF to set the FREQ BUS to 2 [A5] FREQ
COUNTER.
11. Press
NNNNNNNNNNNNNNNNNNNN
RETURN ,
NNNNNNNN
A5 ,
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
FREQ COUNTER . Conrm that the frequency counter input (FREQ
CNTR INPUT:) is FV CAL.
12.
Press
NNNNNNNNNNNNNNNNNNNN
RETURN ,
NNNNNNNNNNNNNNNNNNNN
RETURN ,
NNNNNNNN
A6 ,
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
FV CALOUT on OFF to set FV CALOUT to ON.
Receiver Group T roubleshooting 8-7