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 16 (click to view)
SLEEP TIMER SETTING
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You can use the sleep timer to turn the radio off automatically after up to 59 minutes. q Before setting, tune in to a station. (See page 10.) 1 Set ALARM/POWER to (!) STANDBY. 2 While holding down SLEEP, press UP or DOWN to set the time to turn off the radio. To cancel the sleep timer, press SLEEP ALARM/OFF. To use both the sleep timer and the alarm You can fall asleep listening to the radio and still be awakened by the radio/buzzer alarm at a preset time. 1 Set the alarm timer referring to steps 1-3 on page 12. 2 While holding down SLEEP, press UP or DOWN to set the sleep timer. To check the remaining time of sleep timer Press SLEEP to display the remaining time.