Thanks to Owner-Manuals.com! This manual was exactly what I needed. As Amana was purchased by Maytag and later by Whirlpool, there was no way to receive it from their websites. I was lucky to find this resource.
A comprehensive Operating and Service Manual. All schematics are complete and easy to read. The PCB drawings and complete parts list are very helpful. I would definitely recommend this manual.
Text excerpt from page 26 (click to view)
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MAIN MENU PICTURE ADJ. SIZE/POSITION ADJ. FUNCTION SELECT STATUS DISPLAY
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SET-UP MENU 2/2 PIXEL SHIFT : OFF POWER SAVE : OFF COLOR-REVERSE : OFF REFRESH : OFF reset all reset HOUR METER x100h : 123 MODEL NAME : GM-420F