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 you for your manual It has the basic things to and i use the Oszi for Longer Time.
Text excerpt from page 44 (click to view)
Selecting the Output Tray
To open the rear output tray:
Open the rear door by pulling it down. The cover functions as the output tray.
Pull the extender to extend the output tray to its full-length position. This will allow the tray to hold longer paper.
If you do not want to stack the printed pages on the rear output tray, slide the extender back into place and close the tray. The pages will then stack on the top output tray.
Note: The capacity of the rear output tray is
the same as that of the Multi-Purpose Tray. If the tray is overloaded with printed pages, it may fall from the printer. Remove the pages so that the tray is not overloaded.