Theory of Operation
3–2
TDS 200 Series Digital Oscilloscope Service Manual
Power Supply
The power supply module generates low voltage DC, a line trigger signal for the
main board, and high voltage AC to power the LCD backlight. The power supply
operates over a wide power line voltage and frequency range.
Display Module
The display module consists of a liquid crystal display (LCD), a display driver,
and a florescent backlight.
Front Panel
The front panel board holds the encoders and push button contacts that the
operator uses to control the instrument. An elastomer mat holds the conductive
pads for the push buttons. Circuits on the front panel convert the matrix into
serial data which is read by the display ASIC on the main Board.
Extension Modules
Each extension module also contains a GPIB, RS–232, and Centronics parallel
printer interface. A ROM on the extension module contains processor instruc-
tions to support the communications interfaces. Extension modules interface with
the processor system through the extension module port connector.
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