Main system does not seem to recognise there is an active phone line
connected.
Should show alternately "HO" or "00" on pressing one of the buttons , just
beeps and 2 character
display stays at "o" and no activation to ring pulses.
Phone and tape sections working order - anyone any specific knowledge ?

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Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/