Desert Viper (600-4132) Troubleshooting Faxback Doc. # 6788 If your vehicle does not operate properly, check the following: Be sure all batteries are fresh and the battery pack is fully charged. Check for interference from other nearby radio-controlled device. Interference can also come from overhead high-voltage wires and power transformers. Be sure the vehicle is not out of the transmitter's range. The range depends on the surrounding terrain and battery strength. If there are obstructions (buildings, fences, and so on) between the transmitter and the vehicle, the range is reduced. If you try these suggestions and still cannot get your vehicle to operate normally, contact your local Radio Shack store for assistance. (LB/all-08/17/94)