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 ?
-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on
You'll have to open it up and do some troubleshooting, once you figure out how it detects the presence of voltage on the line you can probably figure out why it's not detecting it. The problem is likely fairly simple.
just
I'm assuming for the moment that the relay that connects the standing DC on the phone line through to the other side should be active when there is power to the machine and switched to answer machine mode and active phone line is connected so it can register an active line. This relay and driver works if i drive it but 0 level on the only line that connects back to the main micro so presumably an output. The keyboard controller is signalling this main micro when changing operational status but no drive to the relay
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