The Grafix BT20H/091053 Multicontrol panel is an industrial control interface used on KBA printing and offset press machines, providing operator input, status displays, and communication to the machine’s drive system. Common failure points for this class of panels include burnt or tripped power supply modules, degraded LCD backlight LEDs, worn push‑button contacts, and damaged communication traces (e.g., RS‑232/RS‑485 lines). First‑check diagnostics should verify that the panel receives its rated 24 VDC input, inspect all visible connectors for corrosion or loose pins, and test the LCD brightness and button response. Finally, review any error codes displayed on the panel’s status screen to pinpoint drive or communication faults.[oss-gpt-20b]