Option Panel Hkcu-Fp1 - Sony HXCU-100 Service Manual

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).
2-19 (E)
HXCU-100