HP 8642A Operating Manual page 596

FIG. -Zk-IIL/
$
M 1 ^s-
A6A1
FM
^
AUDIO FOR
ANGLE
MODULATION
FM/PM SELECT
AND
CROSSOVER
A6A1
Jl
FM
CONTROL <-y£—r-
LINES , . 2 I
COUNTER I
CONTROL
<-?*■—>~
LINES 3
SERIAL DATA
INTERFACE
500 kHz FM
REFERENCE
AEA1
J5
2
y
SS=SERVICE SHEET
ANGLE MOD
OUT OF LOOP
BANDWIDTH
ANGLE MOD
IN LOOP
BANDWIDTH
SHARER
DCFM
REFERENCE
SS24
350 kHz
FM
REFERENCE
DIVIDER
125
kHz
A6A1
J5
- J - > 1
A6A1
J2
Q | )FW
T ' i LOOP
^
f
OUTPUT
FM LOOP
DIAGNOSTICS
A6A1
J l
SS23
-»26
FM LOOP
DIAGNOSTICS
R e f e r e n c e B I ock D i agr am
C o m p o n e n t C o o r d i n a t e s
COMP
C38
C39
C41
C42
C43
C44
045
C46
CBO
C61
C62
C63
CB4
C65
C66
CBB
059
C70
C71
C76
C7B
CBO
C89
CR8
FL3
FL3
FL4
FL5
Fi.6
FL7
FLB
FL10
J l
X,Y
B, 1
B, 2
B. 2
B. 2
S, 3
B. 3
C 3
0, 1
C. 2
C, 1
B. 2
0. 2
B, 2
B. 2
B. 2
C. 3
C, 3
□ . 1
D. 3
C. 3
D. 2
B, 1
B. 1
C, 3
0. 1
D, i
D, 1
D. 1
D. 1
D. 1
D, 1
0. 1
D. 1
COMP
K3
LB
L10
Q9
012
Q13
014
R32
R34
R35
R36
R38
R39
R40
R41
R42
R43
R45
BAG
R47
R4S
H49
R63
R63
R64
R65
R56
R67
RBB
R69
R70
R71
R72
R74
X,Y
C. 3
0. 2
B, 1
B, 3
B, 2
B. 2
C, 3
B. 1
B. 1
B, 2
B, 1
B, 3
B, 2
B. 3
B. 2
B. 3
B, 3
B. 3
C, 2
C, 2
C. 2
B, 1
B. 2
B, 2
C. 2
C, 2
B. 1
B. 3
B. 2
C. 1
0, 1
C. 1
C. 3
0. 1
COMP
R75
R76
R77
R7B
R79
RB2
RB3
RB4
R87
RBB
RB9
R90
R92
RS3
R94
R95
R96
R97
SI
TP1
TP2
TP3
TP4
TP5
TPB
U7
UB
U12
U13
U14
U15
U16
UJ7
U1B
X,Y
C 3
C. 1
D. 3
B. 1
B. 1
B. 1
C. 3
C. 3
0, 3
0.3
C. 3
C 1
B. 1
B. 1
B, 3
C 2
B. 2
C. 2
0, 2
C, 1
C. 1
C. 1
C. 1
B. 1
B, 2
B. 2
B. 3
8. 2
B. 2
C. 3
0. 3
0. 1
C, 3
C. 2
COMP
U19
U30
U21
VRJ
X,Y
C. 3
C, 1
B, 1
B. 2
1
COMP
X,Y
COMP X,Y
COMP
X,Y
COMP
X,Y
COMP
X,Y
^ p/o F M v c o C Q O Q
\ A6A1 A S S E M B L Y Q Q tL O
\ ^ SEE REVERSE SIDE