hifi engine

Sansui Equilizer model G-E701 schematic diagram

I have Sansui Equalizer model G-E701. There is not included the IC Belongs to the Circuit Chamber VEDIO (2nd hand set). I need this unit for control Audio only. When switched display on but not varied according to the input signal. Is it needed to replace that IC? But I don’t have the Number. Pls help me with the original Manual or schematic diagram of the above unit please.