Turns out this was not the manual i was looking for. The concertmate 670 keyboard i have is a "Realistic" model made for Radio Shack and none of the diagrams on the owners manual i received matches up. HOWEVER, I must say the service Owners Manual provides was fast and efficient by being available online. The manual was in good readable condition and easily downloaded.
Thank´s for your help, I already recived these manual from you
Text excerpt from page 54 (click to view)
Receiving Documents
3
If the other party first talks and then wants to send a fax, press the START/MEMORY key after speaking (press your START/MEMORY key before the sender presses their Start key).
� Make sure that the display shows RECEIVING, then replace the
handset.
START/MEMORY
RECEIVING
Answering with an extension phone
1
Answer the extension phone when it rings.
2
If you hear a soft fax tone, wait until your fax responds (the extension phone will go dead if it is connected to your fax, or you will hear pronounced, high-pitched tones if the phone is connected to a separate wall jack), then hang up.
Beep
Phone goes dead or pronounced, high-pitched tones
3
If the fax doesn�t respond, or if the other party first talks to you and then wants to send a fax, press 5, *, and * on the extension phone (only on a tone dial phone). This signals the fax to begin reception. Hang up.