Theory of Operation
3-4
TDS 420A, TDS 430A & TDS 460A Service Manual
The low voltage power supply is a switching power converter. It supplies power
to all oscilloscope circuitry. The low voltage power supply sends all of its power
to the A01 Backplane where it is distributed to all other circuitry.
B080000 and up instruments. The principal P OWER switch, located on the
rear panel, controls all power to the oscilloscope including the low voltage power
supply.
The ON/STBY switch, located on the front panel, controls all of the power to the
oscilloscope except for part of the circuitry in the low voltage power supply.
The fan provides forced air cooling for the oscilloscope. It connects to +12 V on
the A01 Backplane through the A07 Auxiliary Power board.
The battery provides power to memory circuits that maintain calibration
constants and oscilloscope setups when the oscilloscope power is off.
Low Voltage Power Supply
Fan
Battery
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