TM 11-6720-242-35
(3) Power transformer T2 (fig. 6-17) also has
breakers on the camera control and then to a power
outputs of 25 vdc, 15 vdc, 30 vac, and 6 vac. The +25
supply assembly, located at the bottom of the camera
is connected to potentiometer R8 on the aec board
control (7, fig. 3-8); and a +22 vdc regulator circuit
assembly (fig. 6-15). Potentiometer R8 is adjusted for
which is part of the interface board assembly, located in
a 7-volt input to feedback potentiometer R1 of the aec
the control panel (7, fig. 313). The 115 vac input
components in the body (fig. 6-11). The -25 vdc (fig.
voltage can be checked by depressing the POWER
6-17) is connected to potentiometer R21 on the aec
indicator 3DS1 on the control panel. The +28 vdc
board assembly (fig. 6-15), which adjusts the voltage to
voltage is checked similarly on the OPERATE indicator
the film exposure index network (aei) on the
3DS2.
interconnecting board assembly (fig. 3-12) located in
b. The power supply (fig. 6-17) furnishes the
the camera control (para 2-4). The + 15 vdc and -15
various direct current and alternating current voltages
vdc are used for all integrated circuits and for transistor
used in the camera circuits with the excel)tion of the +22
collectors on the scan, aec, and control board
vdc regulated.
assemblies. Transformer T2 also supplies 30 vac and 6
(1) Conversion of the 115 vac, 400 Hz input
vac reference voltages.
The
30
vac
is
voltage to the dc and ac working voltages of the camera
connected to the transformer T1 of the ring modulator
is accomplished by two circuits which include separate
circuit on the aec board assembly. The 6 vac output is
transformers, a diode bridge rectifier, and associated
applied to the base of the chopper transistor Q6 of the
parts (fig. 6-17).
scan drive system.
(2) Power transformer T1 has an output of 75
(4) The +22 vdc regulated is derived from the +28
vac, floating, which is rectified in the heat sink assembly
vdc primary input and converted in a circuit on the
for application to the collector of scan drive power
interface board assembly (fig. 2-12). Transistor Q3
output transistor Q1 (fig. 616). A second output of
regulates the converted +22 volts. The regulated +22
transformer T1 is +5 vdc, which is applied to the
vdc is used exclusively as a control voltage
collector of transistor Q3 in the scan drive circuit.
Transistor Q3 is a driver stage for power output
.
transistor Q1.
2-18
