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7
If you suspect you have damaged parts, you can follow this
procedure to systematically determine which ones need
replacing:
1. 2.5V/3V lamp (L1), 6V lamp (L2), motor (M1), speaker (SP), and
battery holder (B1): Place batteries in holder. Place each lamp
directly across the battery holder, each should light and L1 should
be brighter. Do the same with the motor (motor + to battery +), it
should spin to the right at high speed. “Tap” the speaker across the
battery holder contacts, you should hear static as it touches. If none
work, then replace your batteries and repeat, if still bad then the
battery holder is damaged.
2. Jumper wires: Use this mini-circuit
to test each jumper wire, the lamp
should light.
3. Snap wires: Use this mini-circuit to
test each of the snap wires, one at
a time. The lamp should light.
4.
Slide switch (S1) and Press switch (S2): Build project #1, if the
lamp (L1) doesn’t light then the slide switch is bad. Replace the
slide switch with the press switch to test it.
5.
100W (R1), 1KW (R2), 5.1KW (R3), and 10KW (R4) resistors, red
LED (D1), and green LED (D2): Build project #7 except initially use
the speaker (SP) in place of the resistor, the red LED should light.
Replace the red LED with the green LED and it should light. Then
replace the speaker with each resistor; the LED should light and
the brightness decreases with the higher value resistors.
6. Alarm IC (U2): Build project #14, you should hear a siren. Then
place a 3-snap wire between grid locations A1 and C1, the sound is
different. Then move the 3-snap from A1-C1 to A3-C3 to hear a 3rd
sound.
7. Music IC (U1): Build project #13. Turn it on and the sound plays for
a while and stops, it resumes if you press and hold down the press
switch. Then touch a 3-snap wire across base grid points A1 and C1
and the sound resumes for a while.
8. Space war IC (U3) and photoresistor (RP): Build project #15, both
switches (S1 and S2) should change the sound. Then replace the
slide switch with the photoresistor, waving your hand over it should
change the sound.
9. Whistle chip (WC): Build project #35 and if there is light on the
photoresistor (RP) then you will hear sound from the whistle chip.
10. Antenna (A1): Build
the mini-circuit shown
here, you should hear
sound.
Advanced Troubleshooting (Adult supervision recommended)
Elenco
®
is not responsible for parts damaged due to
incorrect wiring.
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