HP 8562E, Service Manual

Page: 421 / 482

The HSCAN signal uses Q2 to reset the ramp. Q2 shorts the integrator and sets its output
nominally to ground.
A l 4 F R E Q U E N C Y
A S S E M B L Y
A l l
YTO
F R A C N
PLL
- - - - -
FRAC N TEST
A P P R O X - 1 0
60 TO 96 MHz
SAMPLER IF
- 1 0 T O
60 TO 96 MHz
-----
1
A7 SWITCHED LO
A M P L I F I E R
I
I
I
I
J 5 1 4 . 5 T O 1 8 . 5
L O O U T
TO FRONT PANEL
13 TO 16
LOW BAND MIXER OUT
TO A8
J3 13 TO 16
HIGH BAND MIXER OUT
TO A10
J 4 - 9 T O - 2
- - - - - - - - -
3 T O 6 . 8
SAMPLER OUT
TO A15
I
w34
BLACK
W32
WHEN LOCKED, SAME
AS FRACTIONAL N
10 MHz
APPROX
w 3 7
GRAY/GREEN
6 0 0
APPROX 0
T O A l 3
SECOND
CONVERTER
w49
I
(
D E L E T E D
I
I
I
I
I
Figure 1 10. Simplified Synthesizer Section
Synthesizer Section 11-47