Eggtimer Rocketry Eggtimer Quark Assembly Manual page 27

Check Your Battery & Connector
Make sure that you are using one of the recommended batteries to test with. Make sure that
you have the polarity correct: The RED wires must go to the "+" side and the BLACK wires
must go to the "-" side.
If It Still Doesn't Work...
There is, of course, always an outside chance that you have a bad component. We test each PC
board and the surface mounted components before they leave us. Nevertheless, it is always
possible that something may be wrong; there may be a bridge on the PC board itself, etc. If
you have gone through all of the troubleshooting steps and the board still doesn't work, let us
know at support@eggtimerrocketry.com . A high-resolution picture (5 megapixel or better) of
both sides of your circuit board and a description of the problem would be very helpful...