The fm stereo is not working in this Sansui 9090. The signal is received in mono only. The stereo lamp is good. The VCO of the HA1196 multiplex chip is set correctly at 76kHz. In addition, the photocell-lamp (the schematic shows it as a lamp and photo diode but the parts listing says "photocell-lamp") device located in the noise canceller and multi-path circuit board has an internal open lamp. I'm not sure if this will repair the multiplex problem but it wouldn't hurt to try. Does anyone know of a supplier for this part? I believe there were a few manufacturers that used this type of device back in the day.
Thanks for your reply.