If you are inclined to try to service this unit the first step is to download a service manual, this is a sight that has a copy of the manual for download for a price
you will require some hand tools, soldering iron and desoldering brade and some solder, multi meter and some type of signal tracing device like and oscilloscope or and audio tracing amplifier. Look for missing power supply's to your RF front-end circuits and FM discriminator , also track down the analog switching ic to varrifie that this unit is functioning and selecting the FM circuits if you still kneed help contact me further with your findings and a copy of the service guide
Answers & Comments
If you are inclined to try to service this unit the first step is to download a service manual, this is a sight that has a copy of the manual for download for a price
http://www.marantz.owner-manuals.com/ST48-service-manual-MARANTZ.html
you will require some hand tools, soldering iron and desoldering brade and some solder, multi meter and some type of signal tracing device like and oscilloscope or and audio tracing amplifier.
Look for missing power supply's to your RF front-end circuits and FM discriminator , also track down the analog switching ic to varrifie that this unit is functioning and selecting the FM circuits
if you still kneed help contact me further with your findings and a copy of the service guide
Have a good day and good luck
Best regards Falco