Elenco Surface Mount Technology Kit - Manual (Page 10)

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FINAL ASSEMBLY
r Use scissors or single edge razor
blade to cut the thick cushion tape
into four 1/4” pieces. Peel off one of
the protective layers and stick the
tape to the corners of the PC board
as shown in Figure 12.
r Peel the protective backing off the 3
x 4 1/2” red filter.
r Remove the remaining protective
backing from the cushion tape.
Align the word ASK on the red filter
with the 7/32” spacer and stick the
filter to the cushion tape as shown
in Figure 12.
TROUBLESHOOTING
A) NO SOUND AND NO LEDs
1) Check that the battery snap is wired as shown in Figure 10.
2) Check that IC1 and IC2 are not installed backwards (see Figures 6 and 7). Be sure there are no solder
bridges between the IC pins.
3) Check that the dimple switch is mounted with the dome upward.
4) Check the value and the soldering of R5.
5) Check Q1.
B) SOUND BUT NO LEDs
1) Check that IC2 is not mounted backwards (see Figure 7). Be sure there are no solder bridges between the
IC pins.
2) Check the value and soldering of R8.
3) Check LED1 through LED6.
C) LEDs BUT NO SOUND
1) Check that the buzzer is soldered as in Figure 10. Check the solder connection between the jumper wire
and the center part of the buzzer.
2) Check for soldering bridges between the pins of IC1.
3) Check the value and the soldering of R3, R4, and R7.
D) LEDs STOP AS SOON AS SWITCH IS RELEASED
1) Check that C3 is mounted as shown in Figure 8.
2) Check that C4 is mounted as shown in Figure 9.
3) Check the value and soldering of R6.
4) Check D1.
Figure 12