YAMAHA - YST-SW800 - SUBWOOFER - AMP - SCHEMATIC (Circuit Diagram)

SCHEMATIC [POWER AMP]

Q23 à 2SJ406

Q24 à 2SK2378

Q25 à 2SJ406

Q26 à 2SG4449 E,F

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As a high voltage is applied to the SW power supply section and the power amplifier, be careful not to recieve an electric shock.
To stabilize operation of the amplifier, turn ON the power with No Input signal and wait for 1 to 2 minutes in non-loaded condition before the adjustment.  Adjust VR1, so that the voltage between the terminals TP1 & TP2 is DV 50mv to 250mv.