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Kenwood KR-A46 AM FM Stereo Receiver service manual

Good evening,
I'm new to hifiengine.
I live in Brazil and I would like to know if you could help me to find a "Kenwood KR-A46 AM FM Stereo Receiver service manual" or any technical documentation about it?
As I'm a former Xerox of Brazil electronics engineer, I would try to fix my old receiver (but a "classic" for me) by myself.
Many thanks,
Marco Valentim
marco2valentim@gmail.com