HP 3585A Service Manual page 141

Adj ustments
O s c i l l ator C o i l L
c. Connect a frequency counter to A221 1 .
d . Verify that the frequency counter now reads 1 00 . 3 5MHz.
e. Using a DVM, check that the voltage at A22TP 1 measures -5 .0Vdc
f. Adj ust the voltage at A22TP2 by squeezing or expanding oscillator coil A22L l . The
voltage reading should be -2.0Vdc
making your voltage reading.
g . Enter CENTER FREQUENCY . . . STEP
h . The frequency counter should now read 1 40.35MHz.
i . Turn the 3585A power off. Replace the A22 board in the card nest and turn the 3585A
power back on .
j . Set the 3 585A controls for :
5-26
@
1 -
_
� I
- R2 5 -
- CI7 -
Q 6
1 1
6 I
CI6 -
I
I
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It)
.:c� _
i i � l �
i �
I
I
� u
- R31-
- CIS -
- R32 - I
- L7-
--
-RI O - I - R I I-
-C 4 0 -
- C33- -- L I I --
- C9 -
-R6-
-Ra-
- L 2 -
-C 32 -
=-gg=
- CR2-
-RI-
O O O O O O O O O O O O O O D
Figure 5·2 1 . First LO VTO Board (A22)
±
O. l V . Be sure to remove any tools from A22L 1 before
RES . B W HOLD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . O N
CENTER FREQUENCy . . . . . . . . . . . . . . . . . . . . . . OHz
FREQUENCY SPAN . . . . . . . . . . . . . . . . . . . . . . . . . OHz
CF STEP SIZE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40MHz
RES . BW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3KHz
MANUAL FREQUENCy . . . . . . . . . . . . . . . . . . . . . OHz
�
�
R3 5 -
.... ..
- ,
I
-R 3 9-
I
,
C\I
- R 3 4-
:::J
- R36-
I
I
3 -
I
�
- C3 5 -
1 � �
i
-C23-
- R lf - 0:
I -Ci2� - I
,
I
I
(I)
- R2 0 -
U) O: ...J 1 I
- RI3 -
er
ii: I
I
- C29 - - CI / - ,
0:
--
I
It')
iE (I) I
�t:
C34
,
TP2 ' I �
- CR4 -
I
���J�� I I
��u
Bias Volta ge
- R 5 -
I
fif
I
010
�
3 ,
I
�
I
I �
u �
yu
ID
I
N
-R3-
•
I
I
I
on the 3585A keyboard .
Model 3 585A
TP2
TP 1
±
O. l V .