Elenco Snap Circuits® Deluxe Sound & Light Combo - Manual (Page 25)

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Advanced Troubleshooting
(Adult supervision recommended)
10. NPN transistor (Q2): Build the mini-
circuit shown here. The red LED (D1)
should only be on if the press switch (S2)
is pressed. If otherwise, then Q2 is
damaged
11. Strobe IC (U23) and 100kW resistor
(R5): Build the mini-circuit shown here,
and turn on the switch (S1). The speaker
should make a buzzing sound or U23 is
bad. Next use the 100kW resistor in place
of the 5.1kW resistor; the sound should be
a beeping sound now or R5 is bad.
12. Infrared module (U24): Build project 42,
the remote control should turn the red LED
(D1) on; otherwise U24 is bad.
13. Color organ (U22): Do project 183. If
parts A or B do not work, U22 is damaged.
If part C does not work, then there may be
a problem with U22, with your stereo
cable, with your music device, or you may
not have your music device on the right
settings.
14. Keyboard (U26): Build project 272, but
omit the 0.1mF capacitor (C2) and the
5.1kW resistor (R3). You should hear a
tone when you press any key. Turning the
TUNE knob while pressing any green key
should change the tone slightly. Now add
R3 to the circuit, and you should hear a
continuous tone. If any of this does not
work then the keyboard is damaged.
15. 0.1mF (C2), 1mF (C7), 100mF (C4), and
470mF (C5) capacitors: Build project 272;
removing C2 from it should change the
tone, or C2 is damaged. Next, replace C2
with C7; the pitch of the tone should be
lower now, or C7 is damaged. Next,
replace C7 with C4; you should hear a
click about once a second, or C4 is
damaged. Next, replace C4 with C5; you
should hear a click every few seconds, or
C5 is damaged.
16. Voice changer (U27): Build project 190.
Follow the project’s instructions to confirm
that you can make a recording and play it
back at different speeds.
17. Audio Jack (JA) and stereo cable: If
you have headphones, use them to test
the audio jack using project 197. If you
have a music device, use it to test the
audio jack using project 244. Use project
244 to test your stereo cable.
18. Sound energy demonstration container:
If the flexible sheet is damaged,
disassemble the container and replace the
flexible sheet; this set may have included
a spare for it, or you can use household
plastic wrap.
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SCC-350_Manual_Part_A.qxp 7/25/14 2:39 PM Page 25