-6-
ASSEMBLE COMPONENTS TO THE PC BOARD (continued)
Speaker
Remove the backing from one side of the
speaker pad and then attach it to the speaker.
Remove the second backing and attach the
speaker to the PC board as shown.
Solder the speaker wires to points A and B on
the the PC board as shown.
Battery Holder
Bend the battery holder leads as shown below.
Remove the backing from one side of the foam tape. Attach the
foam tape to the battery holder as shown.
Remove the second backing and attach the holder to the PC board
as shown.
Solder the battery holder’s two leads to the PC board as shown. Cut
off the excess leads.
Speaker
Speaker Pad
PC Board
Black Wire
Red Wire
Point B
Point A
Foam Tape
Battery Holder
Foam Tape
Backing
Foam Tape
Backing
Solder
Bend Leads
Figure G
Figure H
TESTING
1. Be sure that all components have been mounted
in their correct places.
2. Check that the electrolytic capacitor C2 has been
installed correctly.
3. Be sure that the LM555 IC U1 has been installed
correctly.
4. Check all solder connections. Solder should flow
into a smooth puddle rather than a round ball.
Resolder any connection that has formed into a ball.
5. Have any solder bridges formed?
6. Check the battery voltage.
TROUBLESHOOTING
Contact Elenco
TM
Electronics if you have any problems.
DO NOT contact your place of purchase as they will
not be able to help you.
Set VR1 fully counter clockwise, switch SW1 to
LOW, and SW2 to OFF. Insert a 9V battery and set
SW2 to ON. The LED lights and you should not
hear any sound from the speaker. Short the two
washers, the speaker sounds as the LED flashes.
Adjust VR1 clockwise and the frequency increases.
Set SW1 to HIGH and adjust VR1 the same way.
Note, you do not hear the tone when VR1 is fully
clockwise in the HIGH mode. After testing the unit
is complete, go on to Operation on the next page.
