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1-10-7.
AU-358 Board
AU-358 board contains tally (red/green) and status indicator LEDs, menu operation switches, intercom switches, and a
microphone amplifier gain. Selection of the microphone amplifier gain, BIAS power on/off, and balance/unbalance is
set by the CCU menu.
The CCU control panel HKCU-FP2 is detected by the AU-358 board, and HKCU-FP2 signals are sent through the
AU-358 board.
1-10-8.
CN-3664 Board
CN-3664 board contains an intercom connector (XLR-5, female). This board is connected to the AU-358 board.
1-10-9.
PS-739D Board
The PS-739D board generates DC 38 V and 180 V for the camera, 28 V for the RCP, and 15 V for the CCU from the
AC line power input, and supplies these power voltages. Commercial power 100 to 240 VAC is supplied from the rear
AC inlet through the front AC switch. The internal LV converter supplies 15 V for the CCU and 28 V for the RCP. The
internal HV converter supplies CAM 38 V and 180 V. When the CCU is connected to the camera, 38 V is output first.
After that, when the connected camera is recognized, 180 V is output upon reception of the CAM POWER ON signal
from the CCU.
1-10-10. CT-257D Board
The small CT-257D board located on the PS-739D board contains an internal protective circuit, a PLD circuit for CHU
output control, and a 28 V output regulator for RCP.
HXCU-TX70
1-19
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