The owner's manual/operating instructions that I purchased was the original factory document and it was in at least three and maybe more languages. I no longer have it because I sold the tape recorder and included the owner's manual/operating instructions and a service/repair manual that I bought on ebay for the new owner.
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.
Great price, Quick delivery, the document was very usefull A+++++++++++++++
Text excerpt from page 3 (click to view)
Specifications
Product type Model Type of lens Picture size (diagonal) Focal length F no. Screen width to throw distance ratio Dimensions Weight Wide Conversion Lens for Projector AN-W9Z Wide conversion lens 50" to 150" 26.1 ~ 35.3mm 3.0 1.45 ~ 1.96:1 � 91.5 � 56.0 Approx. 410g
Throw distance chart
The replacement lens is a wide conversion lens. Once the lens is installed, set the picture size and the projection distance, referring to the table below. Normal mode
When using a normal screen (4:3)
In case of setting the 16:9 picture to the full horizontal width of the 4:3 screen.
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Projection Distance (y) Minimum (y2) 14'7" (4.4 m) 9'8" (2.9 m) 8'1" (2.5 m) 6'11" (2.1 m) 5'8" (1.7 m)
Height Maximum (y1) 90" 19'9" (6.0 m) 60" 13'1" (4.0 m) 50" 10'12" (3.3 m) 43" 36" 9'5" (2.9 m) 7'9" (2.4 m)
3
The fomula for screen size and projection distance
y1 = (0.04038x � 0.06318) � 3.28 y2 = (0.03x � 0.06317) � 3.28 x : Screen size (diag.) (inches) y : Projection distance (feet) � There is an error of ±3% in the formula above.