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be very difficult to track down and locate, and may require that you ask the customer if such devices
are present. Some common sources of interference signals are listed below.
4. Using an ohmmeter, verify that upper and lower PCAs have a good electrical path to chassis
ground.
5. If the above procedures do not correct the problem, replace the heart rate board.
Possible sources of interference signals include, BUT NOT LIMITED TO:
Wi-Fi Network Routers
Cordless Telephones
Cell Phones
Electronic Dog Fences
Garage Door Remotes
Noisy AC feeds
Florescent light ballasts
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