Recorder Signal Circuits - HP 7414A Operating And Service Manual

Section IV
Principles of Operation
Model 7754A/7414A
10
R28
RI5
LOW
LIMIT
HIGH
LIMIT
-12V
+12V
-------------...,
R8
-24V
R7
+12V
R5 R2
R3
R6
~4:-A~A~A7
- - - - - - - - -
DRIVER AMPLIFIER
ASSEMBLY
~iA1TR~mR
- - - - - - -.,
I
BOARD ASSEMBLY
I
HEAT CONTROL
I
I
I
I
r-----o--..J
I
r
I
3
I
i ----
GAlVANOMETERASSEM81Y'"
)
SIGNAL
~
I
~
I
P O S I T I O N :
81 , I
F
~
I TRANSDUCER
8
I
I
I I
DRIVE
I
Q9 COIL 19
>t---r4
1
I I
r--7
A 6
>--?
21
I
~2 I
I
2
I
4
>--7
41 I
I
I
POWER
I
I
DEMODULATOR
1
I
GND
1 I
I
I
I
POSITION
l
L
~2'::
-
£
_6 _ _
':I~
_
J
R36 -20V R29 L
>t
FEEDBACK
~
L.: >=
a-
~C-T5
. . .
C 6~_ 6'i~PING!
L
rAe,6oHz,OR -,
j-
~O:
: - - - JA
..!.ll
VELOCITY
I I
A9, 50Hz
I
OSC _
R33 FEEDBACK
OSCillATOR-REGULATOR
-7
LI)~:"'=":;'-------
I
I I
ASSEMBLY
~
I
K
I
OSC GND
I
*
Q4. Q7 AND ASSOCIATEP - ,
L
~~N~T~~NOT ~~ :...
-.J
L
...J
L ..1
4
~+20V
5
~+12V
61~-12V
31~-20V
21~-24V
B
I
~
SIGNAL GND
I
~I
I
RUNO
(C
GAINfJ?:
-12V
+12V
POSITION~E
-12V
SIGNAL(FIG.4-2)
HEAT
~
.
CONTROL~
J
-12V
Figure 4-3. Recorder Signal Circuits, Simplified Diagram.