This part is a kind of semiconductor called KRC-578R.

Function of this product has (KRC-578R / KRC-678R) Manual.

Manufacturers : Kenwood

Image and pinout :

Some of the text within the PDF file :

KRC-678R KRC-678RV KRC-578R DataShe CASSETTE RECEIVER INSTRUCTION MANUAL B64-1635-00 (EN) DataSheet 4 U .com Contents English Before use DataShe Safety precautions 3 Power5 Volume ..5 Attenuator .5 Switching Modes ..6 TEL Mute ..6 Theft Deterren [ ... ]

KRC-578R PDF Datasheet Download