b. The horizontal timing pulses are used to generate the horizontal
drive for the master sweep board, and produce horizontal clamping and
c. The sync pulse is sent to the CCU with the green signal, and the
Power distribution: The camera control unit accepts either 115 V AC or
230 V AC at the back panel. This is then converted to unregulated nominal
+22 V DC and -22 V DC and +30 V DC. These voltages are used in both the CCU
and the camera head.
a. In the CCU, the minimal -22 V and +22 V are regulated to 15 V and
used to power most CCU electronics. The +30 V is delayed and used to power
the high voltage power supply which produces +900 V DC, +300 V DC, and -100
b. The +900 V DC and the +300 V DC are sent directly to the camera
head, while the -100 V DC goes to the front panel beam controls.
c. The nominal -22 V is used for generating focus current and supplying
the tally from the CCU. A regulator on the sync delay board provides +5 V
DC for the digital logic circuits from the + 15 V.
In the camera head, the nominal -22 V and the +22 V are regulated down
to +12 V DC and -12 V DC to supply most of the electronics in the head. The
undelayed 30 V and the -22 V also pass through soft regulators and are
converted to +22 V and -10 V. These voltages are used on the yoke driver
The delayed +30 V is also used to supply the filament circuit,
which is both current and voltage protected.
a. The +300 V supply from the CCU is converted to +43 V for the target
supply and +50 V is also filtered and applied to the G-2 electrodes of the
three pickup tubes. The +900 V supply is converted to +550 V and +430 V on
the electrode regulator board and then applied to the G-4 and G-3
b. The power line voltage supplied to the CCU is also sent to the
viewfinder and to the lapsed time meter in the camera head after passing
through the power switch.