Where do I find the Function button to switch on the FM radio on the Sansui CD Boombox SCDB-849 please?

SOURCE: How to preset a radio station on Sony CFD-S200 Cassette/CD boombox

You will need to use the Forward and Reverse buttons on the CD player. Set the station by holding the button you want to set it to until it blinks and shows the station number.
To set more that 10 stations. Press the (>10) button and then enter 11 or 12 or so on and set the stations the same as above.

SOURCE: Sansui RZ 1500 II-Manual

i have the same problem but my receiver doesn't change sources and its blocked on the last station llistened. the problem appeared when i washed the face of the receiver with a special spray. i think that i have done something very wrong like a short cut in the command processor. any help, please?

SOURCE: Honda Radio button lights do not illuminate

were the lights working before?
sounds like a defective radio.

SOURCE: Sirius Starmate 4 - locks on the "Sirius: screen

with starmate 3 press at same time menu +memo+band with the radio on (with sirius screen only)

SOURCE: 2008 Nissan Altima radio (AM/FM/CD) does not

2008 Altima radio-the sound just quit working. Everything else seems to be OK. I can change the radio stations, but no sound. Is there a fuse that could be bad?