Repair GuidesHitachi / Fujifilm Aloka Ultrasound Board-Level Symptoms: A Decision Path for ARIETTA, Prosound, Alpha and HI VISION RepairsA structured diagnostic decision map for biomedical engineers, ISOs, and hospital procurement teams isolating digital beamformer, channel, motherboard, power supply, and control panel board failures across Hitachi, Fujifilm, and Aloka ultrasound consoles.