Sony UVW-1800 Operating Instructions Manual page 64

3-2 (E) Chapter 8 Maintenance
The UVW-1800/1800P is provided with self-diagnosis functions which detect
internal faults. If a fault is detected, the UVW-1800/1800P displays an error code
in the time counter display and an error message on the monitor screen.
To display error messages on the monitor screen, the monitor must be connected to
the VIDEO 2 (SUPER) OUTPUT connector, and the CHARACTER switch on the
subsidiary control panel must be in the ON position.
When an error message appears on the monitor screen, follow the direction
displayed.