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Theory of Operation
3–2
THS710A, THS720A, THS730A & THS720P Service Manual
Display Module
The display module consists of a liquid crystal display (LCD), a display driver,
and a flourescent backlight.
Switch Assembly
The switch assembly is a matrix of switches that form the front-panel buttons.
The switch assembly consists of a flex-circuit board and an elastomeric switch
mat. Switch closures are read by the processor system.
DMM
Main board
Battery
EXT
PWR
CH 1 CH 2
2
2
J8
PROBE
COMP
COM
RS-232
8
J5
2
5
Inverter boardDisplay assembly Switch assembly
J7 J6
J3
12
J1
80
Not used
17
J9
Adjustment-
lockout
Figure 3–1: Module-level block diagram