Eggtimer Rocketry Flight Computer Manual de usuario descargar pdf (Pagina 30)

Troubleshooting Tips (in approximate order of likelihood)

RED PWR LED doesn’t come on

• Check the polarity of the LED… it may be in backwards

• Bad solder joint on the RED LED or the 2.2K resistor next to it

• Incorrect battery polarity, or bad solder joint on battery connector pads

• Bad solder joint on voltage regulator

• Bad polarity on electrolytic capacitor

• Bad solder joint on electrolytic capacitor

• Battery connector soldered to “DPWR” pads instead of the “BATT” pads

RED LED on the RF MODULE doesn’t flash

• Bad solder joint and/or bridge on the GPS module

(In particular, the second one from the bottom on the left side)

• Bad solder joint and/or bridge on the RF Module

• Bad solder joint and/or bridge on the SN74HC02 Quad NOR gate

• SN74HC02 Quad NOR Gate installed backwards

• Bad solder joint and/or bridge on the processor

• Bad solder joint on the 2.2K resistors to the left of the GPS module

• Bad solder joint on the 10K resistor to the right of the GPS module

No buzzer, RED LED on the RF Module is flashing

• Bad solder joint and/or bridge on the processor

• Bad solder joint and/or bridge on the buzzer

• Bad solder joint and/or bridge on the resonator

AMBER LED doesn’t flash, RED LED on RF module is flashing and buzzer beeps OK

• Very weak GPS signal, try it outdoors

• Few satellites in view, let it run for about 30 minutes

• Bad solder joint on GPS module

(in particular the 5

& 6

joints on the left, and the 5

and 7

joints on the right)

• Solder bridge on GPS module pads (see above)

• Bad solder joint/bridge on the 2.2K resistors to the left of the GPS module

• Bad solder joint;/bridge on the 10K resistor immediately to the right of the GPS module

• Amber LED is backwards

• Bad solder joint on Amber LED

• Bad solder joint on 330 ohm resistor

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Eggtimer Rocketry Flight Computer Manual de usuario Pagina 30