Sony HKCU-FP1, Руководство по обслуживанию

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2-19 (E)
HXCU-100
Option Panel HKCU-FP1
SW-1413 Board
This board contains control switches, control potentiometers, and SHUTTER, MASTER GAIN, and
indicator LEDs, and consists of a control interface circuit and a
+
3.3 V power supply circuit (IC1) for the
interface circuit.
This board is connected to the SY-364 board with a
fl exible card wire, and works only on
+
5 V supplied
from the SY-364 board. The SHUTTER, MASTER GAIN, and indicator LEDs work on
+
5 V, and the
control interface circuit and the control potentiometers work on
+
3.3 V generated by the
+
3.3 V power
supply circuit (IC1).
The control switches and SHUTTER, MASTER GAIN, and indicator LEDs are controlled from the
SY-364 board through the IIC bus compatible 16-channel I/O (IC4, IC5, IC6, and IC11). The control
potentiometer output (0 to
+
3.3 V) is buffered by the voltage follower, and is then output directly to the
SY-364 board for A/D conversion.
Two levels of brightness of the illuminated button and the indicator are selectable with the CCU menu.
However, the brightness of the SHUTTER and MASTER GAIN LEDs is constant.
LED-473 Board
This small board is mounted on the SW-1413 board, and contains the SHUTTER and MASTER GAIN
LEDs (7-segment LEDs and light guides).