Sound Board - Tandy 6000 Service Manual

Service Manual
7.7

Sound Board

The Sound PCB is a small board located in the front left
corner of the Base Assembly; it is accessible when the
Cover/Bezel Assembly is removed from the Base Assembly (see
Section 3 for disassembly procedures).
the I/O Processor PCB by a cable that has a connector on
either end.
The function of the Sound PCB is to generate an audible
signal whenever a key is depressed on the keyboard.
Contained on this board is an LM555 timer/oscillator that
generates a 1558 Hz tone when a pulse is received from the
computer. The voltage required to operate the circuit is 12
volts supplied from the computer at pin 3 of the input jack
Jl. The frequency of the device is controlled by Rl, R 2 ,
and Cl. There is no provision for varying the volume of the
tone generated by the Sound PCB.
TANDY COMPUTER PRODUCTS
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TANDY 6000/6000-HD
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It is connected to