Elenco Yap Box - Manual (Page 8)

OPERATING PROCEDURE
1. Flip the side switch to change the circuit over the three other sounds.
TROUBLESHOOTING
One of the most frequently occuring problems is poor solder connections.
1. Tug slightly on all of the parts to make sure that they are indeed soldered.
2. All solder connections should be shiny. Resolder any that are not.
3. Solder should flaw into a smooth puddle rather than a round ball. Resolder any connection that has
formed into a ball.
4. Have any solder bridges formed? A solder bridge may occur if you accidentally touch an adjacent foil by
using too much solder or by dragging iron across adjacent foils. Break the bridge with your soldering iron.
COMPONENT CHECK
1. Be sure that all of the components have been mounted in their correct places.
2. Be sure that the electrolytic capacitors C1, C7, C4, and C10 have been installed correctly . These capacitors
have polarity. The negative and positive leads must be in the correct holes.
3. Be sure that the diodes D1-D8 have not been installed backwards. The band on the diodes should be in the
same direction as shown in the pictoral diagram.
4. Be sure that the speaker is not touching any of the copper traces on the PC board.
5. Be sure that the three dimples are not touching the middle pad. Oscillator will run continously if it touches.
6. If no sounds are produced, check 1) the battery, 2) the output circuit Q1 and Q2, and 3) the IC (it may be in
backwards).
Elenco ® Electronics, Inc.
150 Carpenter Avenue • Wheeling, IL 60090
(847) 541-3800 • Website: www.elenco.com • e-mail: [email protected]
SCHEMATIC DIAGRAM