Parker / continental 690 frequency converter maintenance - JiaHongWei maintenance can provide 590c series, 590P series, 514C series, 512c series, 650 / 690 series and other common maintenance of Parker, Continental, SSD and other governors. For maintenance, please call the maintenance service hotline 0755-28916839, 13640994287. We have professional customer service personnel to respond to your needs quickly.