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OPTOTHEORY
The opto receiver (Photo Transistor) should be approximately 0.1-0.7 volts when the opto beam
is unblocked and approximately 11-13 volts when the opto beam is blocked. The opto transmitter
(L.E.D.) should always be approximately 1.4 volts. Note, the transmitter (L.E.D.) is larger than
the receiver (Photo Transistor); it protrudes further from its case.
LED Board (A-1690B)
Transmitter
1.0-1.1 Volts
Photo Transistor
Board (A-16909)
Receiver
0.1-0.7V Unblocked
11 -1 3V Blocked
Infrared
Ray
Green
o
WHT
Gray-XXX
Black
Gray-Yellow
Orange-XXX
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