Videotex Emulation Problems

This document (FCO VTX20-I001) details a hardware modification for VTX20 terminals in the European region. It addresses firmware V1.2 issues that caused incorrect display of Videotex frames and modem communication problems (specifically voltage drops and backward channel support). The solution involves replacing the VTX logic module with a revision B2 or later module. The document includes a full list of replacement parts, safety precautions, a step-by-step installation procedure, and instructions for reporting the installation (LARS).