Model 8640B TM 9-4935-601-14-7&P
Change 25 (Cont’d)
Figure 8-25. FM Amplifiers Schematic Diagram (2 of 2, P/O Change 25)
7-63
PIO
AJ3
I
PIO
TO
OVER
DEVIATION
DETECTOR
PIO
A3
RF
OSCILLATOR
ASSY
108641hill001
t
P'lQlJ~
~ONNECTOR
BO~RQ_ASsno864o:""""'.rf!"""l"'.'1_-61--
l
I
FM
GAIN
COMPENSATION
R2t
~Q,
...---__;;
2000
~---------o--<938
'
P/0
A9
PEAK
DEVIATION
AND
RANGE
SWITCH
ASSEMBLY
~
A9Ai
SWITCH
~S~EMBLY
I08640-IIJ1791_
- -
.o._
____
- - - - -
~
0
A9AIA2
FM
GAIN
SWITCH
BOARD
ASSEMBLY
108640-602541
~
I
- - - -
FM
SYSTEM
GAIN
ldBI
FROM
A5TP3
TO-A9TPA
IWITH
A7
RE;,VED
I
OR
WITH
LEVELS
AT
A9TPA
<0
3Vrmsl
I
xr
14
>--+--8
8
I
7 / •
cos
P/0
XA3A4
~ll
!
II
13~7
I
PIO
A9A2
INTERCONNECT
ASSY
108640-602561
--~
I
PIO
PIO
PIO
PIO
P/0 I
X~5
Pl
W2
12
P,2
I
10~23
I
'
16
I
I
I
' I
I : I : : :I I
R7
178
LOW
'.1
SENS
AD1
~~-,-M-1-0-------~~-<~~
lfl~~~s
R8
5\l
R6
1000
C4
56
R9
(roJ
C3
56
I
I I
Rll
liDO
Rl4
OFF
1000
1·6
dBI
1·12
dBI
1·18
dBI
1-24
dB
PEAK
RANGE
l~zl
DEVIATION
0.
5
I 2
4 8
16
32
64
128
256
Sl2
TO
TO TO
TO
TO
TO
TO
TO
TO
TO
TO
l
2
4
8
16
32
64
128
256
512
1024
5.12
MHZ
24
2.
56
MHz
24
18
1.28
MHz
cf:~'
24
18
12
640kHZ
~'~"'
24
18
12
6
320
kHZ
>}~'-'
24
18
12
6 0
IIIJ
kHz
~>}~
24
18
12
6 0
-6
~kHz
40kHz
20kHz
24
10kHz
24
18
5kHz
24
18
12
7
GAIN
c8*
1500
NON-FUNCTIONING
LINE
24
18
12
6
24
18
12
6 0
0
·6
-6
-12
-12
-18
I I
I
18
12
6
0
"6
-]2
-18
·24
12
6
0
-6
-12
-18 -24
-l)
6 0
"6
·]2
·]8
-24
·J()
-36
r---__
_:~
I I
I
I
I I
I I
I
I
All
VOLTAGES
~~~ITH
FM
SWITCH
SET
TO
OFF;
TOLERANCE
IS
±
1~.
NORMALLY
OPEN.
SEE
BACKDATING,
TABLES
7-1
AND
7-2.
REFERENCE
DESIGNATIONS
A3
A9AIA2
R2
Cl-<1
A3A4
Rl-20
P/0 Sl
R2-4,
7-<1
WI
AS
A9A2
Cl-9
P/0 PI
CRS-13
P/0
WI
W2
QJ-12
A9A2Al
Rl-20,
22·41
P/0 Jl.
12
Ul
Kl
P/0
P2
A9A!
AJ3
Rl
cu
Jl
R2-4,
6
51
XA3M
A3MUI
A~ I
TOP
VIEW
CIRCUIT
BOARD
TOP
VIEW
8 5
0000
KEY<>ooo
I
4
6
A3,
AS
~~
~:
:_:
:ii
R20~
~
12
~
21
'
10
(---------~~16__,.2;..:.K--l~
~
I_ I
_j
-~==~~-~==~~~~~~~~~~~~
A9
1
A13
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