Foil Side of Receiver PC Board
Foil Side of Transmitter PC Board
-20-
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
TM
Electronics if any parts are missing or damaged.
DO NOT contact your place of purchase as
they will not be able to help you.
