Elenco Christmas Tree Kit - Manual (Page 7)

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SCHEMATIC DIAGRAM
OPERATING INSTRUCTIONS
Turn the switch on. The LEDs will randomly blink and the three melodies will begin to play.
TROUBLESHOOTING
Contact ELENCO ® if you have any problems. DO NOT contact your place of purchase as they will not be able
to help you.
1. One of the most frequently occurring problems is
poor solder connections.
a) Tug slightly on all parts to make sure that
they are indeed soldered.
b) All solder connections should be shiny.
Resolder any that are not.
c) Solder should flow into a smooth puddle
rather than a round ball. Resolder any
connection that has formed into a ball.
d) Have any solder bridges formed? A solder
bridge may occur if you accidentally touch an
adjacent foil by using too much solder or by
dragging the soldering iron across adjacent
foils. Break the bridge with your soldering
iron.
2. Be sure that all components have been mounted
in their correct places.
a) Use a fresh 9 volt battery.
b) Be sure that the electrolytic capacitors C1,
C3, C5 and C7 have been installed correctly.
These capacitors have polarity, the negative
and positive leads must be in the correct
holes, as shown on the top legend of the PC
board.
c) Be sure that the two 556 ICs have been
installed correctly. The notch or dot on the IC
should be in the same direction as shown on
the top legend of the PC board.
d) Be sure that the LED has been installed
correctly. The flat side of the LED should be
in the same direction as marked on the top
legend of the PC board.