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...5 ELECTRONICS SECTION
5.4 Microprocessor Unit – Figs. 5.3 and 5.4
The electronic section comprises six main circuit boards which
carry out the following functions:
Mother Board
Cuvette Input Board
Microprocessor Board
Voltage
Selector
Ribbon Cable
to Display and
Keypad
16
Comprises the user terminations,
alarm relays, and sockets for the
four plug-in boards.
Processes the signals from the
two photocells and controls the
lamp brightness.
The heart of the electronics
section which controls all aspects
of the monitor.
Cuvette Input
Microprocessor
Board
Board
Power Supply
Unit (PSU)
Fig. 5.3 Microprocessor Unit
Drive Board
Output Board
Display Board
Drive
Output
Motherboard
Board
Board
R.F. Screen
Provides outputs to drive internal
functions, i.e. stream section,
calibration valves, pump motor,
and heater control.
Provides
current
and
outputs and, if fitted, the serial
interface.
Connected to the microprocessor
board by a ribbon cable and
provides display and keypad
functions.
Mains (Power Supply) Input
Connector Block
Connector
Blocks
(See Figs.
2.4 & 2.5)
alarm
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