Snap Circuits K-24 - Manual (Page 7)

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TROUBLESHOOTING
Consult your instructor or contact Elenco Electronics 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.
COMPONENT CHECK
1. Be sure that all of the components have been mounted in their correct places.
2. Be sure that the electrolytic capacitors C1 and C4 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.
3. Be sure that transistors Q1 - Q5 have been installed correctly. The flat side should be in the same direction
as shown on the top legend.
4. Use a fresh 9 volt battery.
5. Read the circuit operation lesson manual to familiarize yourself with the workings of the circuit.
SCHEMATIC DIAGRAM