(2) The focus current source is routed through the power cable to camera
cable and then to the focus coils and the deflection assembly (fig 12 foldout).
d. Heater Supply Voltage. This is the negative 12.5 volts which is used for
a DC heater voltage source. The 12.5 volts is divided in half to provide two 6.25
volt DC heater sources. The three pickup tube filaments are connected in parallel
between 12.5 volts and 6.25 volts, and the viewfinder kinescope heater is
connected between 6.25 volts and ground.
e. The 160 Regulated Supply. This voltage is obtained from transformer
T101. It is rectified and filtered by a fullwave bridge rectifier and capacitively
filtered and then fed to the series regulator. The series regulator is a high gain
emitter follower circuit. The output is felt on Zener diode CR39 which establishes
the output voltage.
(1) The DC supply for the reference Zener diode is obtained from a
fullwave rectifier and then capacitively filtered; fuse F111 provides overload
protection.
(2) The output of the 160 volt regulated supply feeds through the power
supply cable to the target and beam controls (fig 12 foldout).
f. The 150 volt Unregulated Power Supply. This voltage is obtained from
transformer T101. The output of transformer T101 is fullwave rectified and
filtered at the input to the 150 volt power supply. Overload protection is
provided by fuse F109.
(1) The developed 150 volt, and +150 volt supplies are sent through the
power cable to the camera head where they are used to develop the 12.5 volts, the
12.5 volts, the 60 volts, as well as direct power for the viewfinder.
(2) The 60 Regulated Supply. This is the voltage used for target
blanking and is derived from the 150 volt unregulated supply.
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