SPORTS ART C51R, Repair Manual

Page: 69 / 83

C51R/C51U Bike Repair Manual (Electronics) - Troubleshooting
Possible Causes of Malfunction
1. Polar transmitter malfunction: No heart rate is detected or transmitted.
2. Polar receiver malfunction: The heart rate signal is not received.
3. Interference is disrupting POLAR receiver operation.
4.The Polar 3-pin wire is not connected properly.
5.The display board is defective; the CPU cannot detect or process the heart rate signal.
Troubleshooting
Order Part Troubleshooting
1 Polar
Transmitter
1. Inspect whether the Polar transmitter operates on other products. See 6-5-3.
2. If not, replace it. Note: Transmitter batteries can be recharged by Polar.
2 Polar
Receiver
1. Inspect Polar receiver placement. Location can determine signal reception. In
general, keep it as far from electronic components as possible.
2. Inspect the solder on the Polar board. If solder is loose, replace the board. Make
sure that nothing metal, including the serial number sticker, touches the antenna, the
blue cube on the receiver board.
3 3-pin Cable 1. Inspect the connection of the 3-pin cable. Inspect cable continuity.
4 Display Board 1. Press down on the display board U1 IC to ensure a good connection.
6-5-2