This is the 6 pages manual for yamaha a 420 schematic.
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7BHAX '3
MainCirumBoard (1) _ orr n or:
b filum_ -SPEAKERS- ON _ ON
! V5 TUNER co vuxo up: REC R L ,
! IAUX PB OUT 9 9 e 6
4'
to MAI
to MAIN (a) W
TAPE MONITOR
ON/ 0F F
MC BALANCE Lowausss