Casio® Inc. Announces Recall of Electronic Keyboards Due to Fire Hazard This recall involves model CTK-710 of the Casio® 61-key full-size electronic musical keyboards. The size of the keyboard is 37-11/16-inches by 14-1/16-inches by 5-1/4 inches. Products with serial numbers ranging from 7030001 through 7040400 and 7041901 through 7043500 are included in this recall. The brand and model information are found on the front of the unit above the keyboard and the serial number is found inside the battery compartment located on the underside of the unit.