D5: touchscreen valid-clicking indicator
4.8 Power board
4.8.1 Overview
The power board provides stable and reliable DC power to the modules and devices
of the system. The circuit is of Flyback converter structure, providing ＋24V, ±12V
and ＋ 5V voltage to the system and the functions of over-current protection,
over-power protection and over-voltage protection are available on the system.
4.8.2 The Basic Feature of the Power Module
4.8.2.1 Alternating Voltage Input
Input power: 140VA
Input AC voltage: 100-240V～
AC2 frequency: 50/60±3Hz
4.8.2.2 Output
A5V output – for circuit board
A12V output – for circuit board (analogue)
-12V output – for circuit board (analogue)
24V output- board motor/power driver
B12V output-recorder/fan/peristaltic pump motor/semi-conductor heater
and power driver
9.9V output-LCD background light power
B5V output-lamp power supply
4.8.2.3 Output Protection
Over-current and over-power protection
Over-voltage protection
Short circuit protection
Over-heating protection
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