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 1 (click to view)
Stereo Radio Cassette Player
AQ 6591
VO LU L
M ME E
FM 88 92 96 100 104 108 MHz AM 53 70 90 120 160 10 x kHz
FM STEREO
TUNING
FM AM TAPE
STERE T O TU NER
STEREO RA AQ6591 DIO CA SSETTE PLAYE AR