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Section IV
Principles of Operation
Model 7754A/7414A
JUMPER
PREAMPLIFIER,----,
RECORDER
OUTPUTS
c:::::J
c=:J
INPUTS
GALVANOMETER
COIL
...
~
1
I
EXTRA MARKER
COIL
MARKER
STYLUS
HEATER
I
~
I
I
..-J
TIMED
MARKER
COIL
I
I
Q
I
POSITION
I
' -
TRANSDUCER
~~-----,
I
I
~~~~~;
I
HEATER
~
RESS;URE
_ _ ....
~.
ROLLER
DRIVE
~
ROLLER/
I
MARKER
DRIVER
MM/SEC
SELeCT
-
GEARBOX
MOT
-
50-60 HZ
~
TIME
AMPLIFIER
GENERATOR
""-
MARKER
SUPPLY
-24V
RUN
1
A3K1
MOTOR
RELAY
R3 :
R1
L
-20f,!
-
SIGNAL
{F6
-20V
SIGNAL HE,IlT
POWER
SUPPLY
A3
-24V
POWER
AMPL
-
r
n1
1--
1
OUTPUT
-
INPUT.o-
AUX ILIA R Y ·
1':----+...
-.---- -
8800 SERIES
PREAMPLIFIER
(SELECTED)
115/230V SW.
FROM TRANSDUCER
-24V RUN
II
l
J
f-----
+12V
REGULATOR
CIRCUITS
1
~
-12V
I
EVENT
I
L -
~
REGULATOR/OSCILLATOR
MARKER
I
EVENT MARK
I
A8(60 HZ), A9lS0 HZ)
I
COIL
POINER
~~~
I_--------------L----------------
-L
~~U~A~
-
I
AUX
POWER
OUTLET
EXTRA
-
A3R2
MARKER
I
C).
-12V
_,
S1
A
powER
I
.....1-
115/230V
F1
F2
RECTIFIER
TO MOTOR
115/230V
.-
CIRCUITS
A-
POWER
-
Q-1~
-
'"
I
INLET
J 3 ; - ; - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - , - - - - - - - - - - - - - - - - - - - - - . ,
POWER
I
I
I
R
R5
INPUT
R15
AMPL
I
••}
•••
~L
R S · ·
~
I
I
I
«?:~'.
A6
V
LlMITEAS
! Al~
!
'7
I
--
--------,
I
COMPENSATION
I
AND
- - - I
I
DAMPING
I
GAIN
0
, I
I
I
TRIM
I
I
•
HEAT CONTROL
I
'
~
I
I
AMPLIFIER
I
1
I
~---------'--:7'"T-
----
I
I
DRIVERAMPLIFIER
J
I~?DE
RUN
CONTROL PANEL
I
I
A4, AS, A6 OR A7
(WITCH
....
A2Al
I
•
r - ; : p : ; ; ; : ; ; O : ; R : : - - - - - - - - -
I
~
OREMOTE
,-+-------~.-t-----+-+-------:.---l
.....
---t---..,Ir---------------{
4
12V
CHART SPEED
I
,
I -
I
~D~: r:.~4
-
--k.
SWITCH
I
~::;ER
+12V
I
I
I
~
(04~_.
_ _
4~~ .~A~.~--f-+-.......-.---I---+---.
I
.5
/~
I
HEAT
I
I
l~~~
- \ -
_~
I
ADJUST
~.. .,~
I
I
I
r<J
0
0
¥~ _4~
:::
1
"
-12V~
I
I
I
I
'-0.
(SEE FIGURE 4-5 FOR
I
POSITION
I
I
I
I
ACTUAL CIRCUIT)
TRIM
I 6
EVENT
MIN
I
I
1
lroJ
0-
l
•
1
M
~ARKER
-
OOFFI
HEAT POT
PREAMPLIFIER
I
I
I
~
4,....-
TIMER
BOARD
POWER SUPPLY
r--------------------- ---,
t
_
SEC
1
A2A_2
A2A3
..J
+12V
REMOTE
• - - - -
- - - - - -
~ -
-'2'---
~
I
RUN
I
2l--------+.....
--------t--t--l~+_+_-----------_(~
I
.....L-
JS
+5V
OSCILLATOR
9
0 - -
- - .
REGULATOR
REGULATOR
~
I
MARK
l..--
I
I
_ _
SIGNAL INTERRUPT
R29
F/gure 4-1. Model 7754A Recorder, Block Diagram.
4-0
07754-1
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