HP 3585A Service Manual page 274

Backdating
f. Once the new set of crystals are installed they must be adjusted in the manner
outlined in Paragraph 5-9 Volume 2.
I f the symmetry ad justment on one of the individual stages does
not have enough range, execute the following procedure.
1. Attempt to ad just the symmetry. Leave the symmetry ad­
justing capacitor in the position which gives the best symmetry.
2. I f the plates of the symmetry capacitor are fully meshed,
choose a larger capacitor from the padding list. I f the plates of the
symmetry capacitor are fully unmeshed, choose a smaller value
capacitor from the padding list (see Table 8-A -3-7 for symmetry
capacitor padding lists).
Board Number
A 1 1
A 1 1
A 1 2
A 1 3
g. After adjusting the IF Filters, check the 3dB Bandwidth and Shape Factor of each
Resolution BW.
1 . If the 3dB Banddwidth and Shape Factor are within spec (3dB Bandwidth
Resolution Bandwidth ± 20%, Shape Factor
then you have successfully installed a new set o f IF crystals .
2. If the 3dB Bandwidth or Shape Factor is out of spec, then the width of some
of the filter stages may need to be changed . Generally, the bandwidth will be
too wide if there is
7-42
Table 8·A·3·6. Crystal and Padding Resistor Numbers
Crystal
Y 1
Y 2
Y 3
Y4
Y 5
NOTE
Table 8·A·3·7. Symmetry Capactor Padding List
Component Number
C 7 0 *
C 7 1 *
C 8 3 *
C 6 6 * , C 6 7 *
a
problem.
Scans by ARTEK MEDIA =>
Padding Resistor
A 1 1 R 9 6
A 1 1 R 9 7
A 1 2 R 5 2
A 1 3 R 8 4
A 1 3 R 8 6
Component Value ·hp· Part Number
3 . 9 p F 0 1 6 0- 2 2 4 7
5 . 1 p F 0 1 6 0- 2 2 50
5 . 1 pF 0 1 6 0- 2 2 5 0
0 1 6 0- 2 2 5 2
6 . 2 pF
7 . 5 p F 0 1 6 0- 2 2 54
3 . 9 pF 0 1 6 0- 2 2 4 7
5 . 1 p F 0 1 6 0- 2 2 50
3 . 9 pF 0 1 60- 2 2 4 7
5 . 1 p F 0 1 6 0- 2 2 5 0
60dB BW/3dB BW
=
Model 3585A
s
=
1 1 : 1 )