User manual

78 Metal Detector
No visual and acoustic signals
after switching on
 This indicates a problem with the power supply.
 Does the battery still supply enough energy?
 Are all components connected with the designated
leads to the circuit board?
 Are all connected components attached in the right
way (polarity)?
One or both LEDs do not light
up
Check if the LED leads are connected to the soldering
pads the right way and with good contact. The lead at the
flattened side of the LED housing has to be connected to the
contact marked “-“ at the soldering pad.
No sound
When no tone sequences and no rhythmic clicking
sounds are emitted, you have to check the piezo buzzer. Is it
correctly connected to the designated soldering pad?