User Guide

-6-
Advanced Troubleshooting (Adult supervision recommended)
Elenco
®
Electronics 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. 2.5V lamp (L1), motor (M1), speaker (SP), and battery holder
(B1):
Place batteries in holder and install bulb in lamp socket.
Place the 2.5V lamp directly across the battery holder, it should
light. 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.
100Ω resistor (R1) and LED (D1): Build project #7 except
initially use the speaker (SP) in place of the LED, you will hear
static if the resistor is good. Then replace the speaker with the
LED and see that it lights.
6. Alarm IC (U2): Build project #17, 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 #74 but use the press switch (S2)
in place of the photoresistor (RP). Turn it on and the LED (D1)
flickers 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 flickering resumes for a while.
8.
Space war IC (U3) and photoresistor (RP): Build project #19,
both switches (S1 and S2) should change the sound. Then
replace either switch with the photoresistor, waving your hand
over it should change the sound.
9.
Whistle chip (WC): Build project #61 and if there is light on the
photoresistor (RP) then you will hear sound from the whistle
chip.
Note: If you have the more advanced models SC-300, SC-500, or
SC-750, there are additional tests in your other project manual(s).
Elenco
®
Electronics, Inc.
150 Carpenter Avenue
Wheeling, IL 60090 U.S.A.
Phone: [phone]
Fax: [phone]
e-mail: [e-mail]
Web site: www.elenco.com
You may order additional / replacement parts at:
www.snapcircuits.net