It was magic after so many years to still be able to source this info. It was equally amazing to return my Pioneer receiver to it near new sound quality AFTER NEARLY 30 YEARS! Thank you for this ability!
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Text excerpt from page 9 (click to view)
7. Replacing the main PCB
Note: The main PCB contains a lithium battery for memory back-up. Please remove the jumper before replacing the PCB. And make sure that the jumper is reset on new main PCB after replacing the PCB. Because no jumper is set on a spare part of the main PCB.
