Manual

Advanced Troubleshooting (Adult supervision recommended)
-10-
Elenco
®
is not responsible for parts damaged due to incorrect
wiring.
If you suspect you have damaged parts, you can follow
this procedure to systematically determine which ones
need replacing:
1. White LED(D6), color LED(D8), horn (W1), and battery
holder(B3): Place batteries in holder. Place the white LED,
and color LED directly across the battery holder (LED + to
battery +), the LED should light. Similarly, place the horn
directly across the battery holder (+ to +), it should make sound.
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 LED should light.
3.
Snap wires: Use this mini-
circuit to test each of the snap
wires, one at a time. The LED
should light.
4.
Vertical snap wires (V1): Use
this mini-circuit to test each of
the vertical snap wires, one at a
time. The LED should light.
5.
Slide switch (S1) and press switch (S2): Build project 1; if
the color LED (D8) doesn’t light then the slide switch is bad.
Replace the slide switch with the press switch to test it.
6. Phototransistor (Q4) and 5.1kW resistor (R3): Build project
54 and vary the amount of light shining on the phototransistor.
The brighter the light on the phototransistor, the brighter the
color LED (D8) should be. Then replace the phototransistor with
the 5.1kW resistor; the color LED should light dimly.
7.
NPNtransistor (Q2): Use project 98; the white LED (D6)
should be on only if the press switch (S2) is pushed. If
otherwise then Q2 is damaged.
8. Light tunnel(U30): Use project 136 to test it.
ELENCO
®
150 Carpenter Avenue
Wheeling, IL 60090 U.S.A.
Phone: [phone]
Fax: [phone]
e-mail: [e-mail]
Website: www.elenco.com
You may order additional / replacement parts at:
www.snapcircuits.net