The suspect co2 monitor was returned for product investigation.The device housing was observed opened, the wires and tubing were disassembled, the tamper sticker was broken, and a resistor on the main board was burned out.During functional testing, the reported product problem was duplicated.The battery cable was plugged into an outlet, and the device began smoking from the burned out resistor.Inspection found the battery cable wires improperly connected to the device.Once the battery cable and mainboard were replaced, the device operated as intended.The reporter indicated that the device began smoking after they had performed maintenance on the device and changed the battery.Therefore, the root cause for the smoking device is due to a shorted resistor that resulted from an improperly installed battery.
|