Table of Contents
Advertisement
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
• Short somewhere on the board... if the regulator gets warm, this is IT
• Bad solder joint on the 10 uF capacitors
• 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
• 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
th
th
& 6
joints on the left, and the 5
th
th
and 7
joints on the right)
Advertisement
Table of Contents
Need help?
Do you have a question about the Eggtimer TRS and is the answer not in the manual?