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SET-UP AND TESTING;
Please note that this test procedure was written for the LB-56 unit
unseparated. If you have "broken" the PC boards into two pieces, some
additional connections (i.e. independent power supply connections) may be
required. It is also important to note that both the transmitting IR LED and
the IR detector both face in the same direction, so it is helpful to point this
end of the circuit board towards a reflective surface (approx. 6" to 1' away).
In normal room light without filters or lenses, the communications range of
the LB-56 is limited. This is because the IR detector diode is easily saturated
by other light and no focusing of the transmitted signal is provided. This can
be corrected with simple lenses and filters and will be described later.
O1 4. Adjust R2, the PC mounted trimmer so that one-half the supply
voltage (4.5 VDC) is measured at the emitter of Q1 at the junction of
R6.
O15. Adjust the audio gain pot, R14, for best quality audio.
LB-56 ¢ 13
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