Theory of Operation
TDS7104 & TDS7054 Service Manual
3-3
The hard drive and CD drive provide access to stored waveform data and
software to customize your oscilloscope with your measurement needs. The
GPIB allows for external control of the oscilloscope.
You can make hardcopies on the GPIB, RS-232, and Centronics ports. Another
port from the CPU board: cal adjust lock.
The NLX board has one USB port and one serial port on the rear panel. The
NLX has 2 U SB channels, but one is used internally, routed to the riser board,
and is not available for use. The NLX has one serial port, which is routed to the
rear panel. A microphone input and earphone output exist on the NLX rear panel.
Ethernet connector is RJ-45. Keyboard and mouse are both P S/2.
The low voltage power supply is a switching power converter with active power
factor control. It supplies power to all of the circuitry in the oscilloscope.
The principal POWER switch, located on the rear panel, controls all power to
the oscilloscope including the Low Voltage P ower Supply. The ON/STBY
switch, located on the front panel, also controls all of the power to the
oscilloscope except for part of the circuitry in the standby power supply.
The power supply sends a power fail (~PF) warning to the processor system if
the power is going down.
Power is distributed throughout the oscilloscope through the front and rear power
distribution bus boards.
The fan assembly provides forced air cooling for the oscilloscope. The fans are
controlled by the CPU and microprocessor.
Rear Panel
Low Voltage Power Supply
Fans
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