TDS3000 Series Service Manual 3–1

Theory of Operation

This chapter describes the electrical operation of the oscilloscope to the module

level. Figure 3–1 shows the oscilloscope module interconnections.

Power
supply Battery
board Main board
J950 J500 J860
comm. module J810
J700 Front
panel Input ports for
application
modules
J900
Attenuator circuit
Display
backlight Display
Ch 1
Ch 1
Ch 2
Ch 2 Ch 3
EXT
Ch 4
2-channel oscilloscopes
Parallel printer
connector
Battery
pack
J800 Floppy
Disk Drive
Fan
AC Line
4-channel oscilloscopes
J150
J100 J100
J170 J200
15 VDC external
device power
connector

Figure 3–1: TDS3000 series block diagram

Power Supply

The power supply converts AC line voltage to 15 VDC to power all internal

circuits and an external power connector. It also supplies power to charge the

optional battery pack.