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.
Actually, I was looking for this information for 3 years!...now thanks to you, the manual is on my hands and of great help, cause I understand now where I was doing wrong connections and wires...excellent, I'll be back to you if in need, thank you.
Text excerpt from page 2 (click to view)
USER�S GUIDE 2327
Dual Time Mode
The Dual Time Mode lets you keep track of the time in another time zone.
To set the Dual Time
Hold down B.
Hour
Seconds
Press B.
Minutes
Press B.
Hour Minutes Mode indicator
1. In the Dual Time Mode, hold down B for about two seconds, until �ADJ� and then the hour digits flash on the display. Keep B depressed until the hour digits flash. 2. Press C to increase the setting. Holding down C changes the current setting at high speed. 3. Press B to move the selection around the display in the above sequence. � The format (12-hour and 24-hour) of the Dual Time matches the format you select for normal timekeeping. � The seconds count is synchronized with the seconds count in the Timekeeping Mode. � If you do not operate any button for a few minutes while a selection is flashing, the flashing stops and the watch goes back to the Dual Time Mode automatically.