The Topcon ALE‑5000 MAIN motherboard is the central control board of a high‑precision industrial edger used in ophthalmic or optical manufacturing systems. Common failure points for this class of equipment include power supply regulator burn‑outs, capacitive decay on the main voltage rails, and firmware corruption due to improper updates; visually inspect for burnt components, sagging electrolytics, and cracked solder joints. First‑check diagnostics: verify 24 V/5 V rail continuity with a multimeter, confirm that all I/O pins are receiving correct logic levels, and review the system’s diagnostic log or error code display for any fault flags before proceeding to component replacement.[oss-gpt-20b]