PURPOSE: To contrive the MT-conversion and miniaturization of the terminal main body and the cost reduction by a method wherein an LSI, a variety of circuit elements, and address setting switch are mounted on a piece of print board, and pat of DIL terminals are made as mode switch terminals, then the cover having a window is filled with filler.

CONSTITUTION: Besides an LSI 2 which constitutes a signal processing logic circuit A, I/O circuits B and C for this circuit A, a power source circuit D, circuit elements 3... constituting peripheral circuits such as a mode setting circuit F and a signal input circuit E, and an address setting switch 4 are mounted on the print board 1. Besides, DIL terminals 5... are projected out of this print board 1: these DIL terminals are I/O terminals of the terminal and mode switch terminals to adapt the circuits on this print board 1 for a various kind of terminals. A print board 1 with a construction of circuits as above-mentioned is provided with a cover 7 having a window 6 through which only 6 the top operation part of the switch 4 is exposed, and this cover 7 is filled with a suitable filler and molded.