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Section IV
Principles of Operation
Model 7754A/7414A
POWER SUPPL
V A3
P8
J5
LINE
POWER
INLET
AUX
PWR
OUTLET
F1
F2
115/230
VOLT
SELECTOR
SWITCH S4
T1
CR5
24VAC
50 HZ
OR
60 HZ
+20V
-20V
-24V
: : : }
GROUND
SIG
PWR
~~rn~------------------------------R~W~~W~
,
REGULATOR
R15
AS (60
HZ)
OR A9 (50
HZ)
I
J
6-12V
MARKER
HEAT
10 ELEMENT
CONNECT
TO REAR
PANEL
JACK J17
5
+12V
2
-24V
OSCILLATOR
L
OUTPUT
MARKER
9
COIL
7
+5V
GROUND
FOR MIN
F GROUND
FOR SEC
t
I
I
I
I
I
I
I
200 KHZ
I
OSCILLATOR
I
I
I
-12V
,
...
L-'-;;;..;;;;.-.;;;-'""""'II~"-==t=-
....
L
_
-12 VOLT
REGULATOR
R12, R13
R3
R25
R27
I
+20V
I
R28
I
I
L_____
I
L
N~~~~=~~~~~
+20V 4
-20V:.!
f--+--------------JlJ.,.,-......Il
R5
-24VAC
TIMING
I
INPUT
REF
GROUND B
f--+--....
~
. .
-4.....
---W'¥--+--i
HEAT
CONTRO L H
f--+-JI,1I/'1r---4~--+-t
IN
Figure 4-10. Recorder Power Supply and Regulator Circuits, Simplified Circuit
07754-1
4-10'
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