Samsung SS-3390 receiver

Im looking for a schematic for this Samsung receiver model SS-3390

I have noticed my FM stereo lamp is not coming on. I switch it between mono and stereo to not hear any audible difference. It has a HA1156W IC for the FM stereo. I wonder if I may have zapped it when I used a brush to remove a deep layer of dust in it.

Anyone who might have the IC might be handy as well.
 
There should be a pot for adjusting the 19 KHz pilot signal.
Do You have good reception ?
Could be also out of alignment. Tweak the coils carefully 1 or 2 mm to each side listening & observing the strength meter. Use a ceramic screwdriver.