Elenco Fiber Optics Voice and Data Kit - Manual (Page 21)

Foil Side of Receiver PC Board Foil Side of Transmitter PC Board
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TROUBLESHOOTING GUIDE
PROBLEM POSSIBLE CAUSE
IF LED D1 DOES NOT LIGHT Check battery connection.
Check orientation of D1.
Check soldering around S1.
THERE IS NO DIM RED GLOW FROM THE Check the value of R1, R4, R5 and orientation of
TRANSMITTER LED D2 transistor Q1 and U1.
Check soldering around Q1 and U1.
THERE IS NO WAVEFORM ON THE Check soldering around S2.
OSCILLOSCOPE WHEN S2 IS ON Check the value of C4.
Check soldering around U1.
THERE IS NO VOICE SIGNAL ON TEST Check resistors R2, R4, R5, and R6.
POINT TP Check microphone orientation.
Check capacitors C1 and C3.
Check U1.
TRANSMITTER
PROBLEM POSSIBLE CAUSE
IF LED D1 DOES NOT LIGHT Check battery connection.
Check orientation of D1 or battery life.
Check soldering around S1.
NO SOUND FROM THE SPEAKER Check speaker and C4 orientation.
Check U1 orientation and soldering.
Check fiber optic cable connection.
THE OUTPUT VOLTAGE IS NOT EQUAL Check orientation of U1.
TO 4V Check soldering around S1, R1, U1, C5 and C4.
RECEIVER
Contact ELENCO ® if any parts are missing or damaged. DO NOT contact your place of purchase as they will
not be able to help you.