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ADJUSTMENT PROCEDURE

CONDITIONS

Atmosphere Temperature....... 18 ° C.
Adjustment Timing ............ Adjust all pots at least 20 minutes after POWER ON.

POWER DRIVER BOARD-83430
1. DC BALANCE ADJUSTMENT (No load at the speaker output terminals)

1) Set all INPUT LEVEL ATTENUATDRS at MIN. position.

2) Connect DC Voltnerter between + and - output terminals of the LF channel.
3) Adjust KVR-l on BF-30 of the channel to let the meter indicates 0 volts.
4) Connect DC Voltmerter between + and - output terminals of the RF channel.
5) Adjust KVR-l on BF-30 of the channel to let the meter indicates 0 volts.
6) Connect DC Volt-erter between +.and - output terminals of the LR channel.
7) Adjust KVR-l on BF-30 of the channel to let the meter indicates 0 volts.
8) Connect DC Voltmerter between + and - output terminals of the RR channel.
9) Adjust KVR-l on BF-30 of the channel to let the meter indicates 0 volts.

2. BIAS CURRENT ADJUSTMENT

1) Set all INPUT LEVEL ATTENUATORS at MIN. position.

2) Connect DC nilivoltneter to the 2P connector marked F on LP channel BF-30.
3) Adjust KVR-Z on BF-30 of the channel to indicate the meter between 2 and 4 IV.
4) Connect DC milivoltmeter to the 2P connector marked F on RF channel BF-30.
5) Adjust KVR-Z on BF-30 of the channel to indicate the meter between 2 and 4 mV.
6) Connect DC milivoltmeter to the 2P connector marked F on LR channel BF-30.
7) Adjust KVR-Z on BF-30 of the channel to indicate the meter between 2 and 4 mv.
8) Connect DC milivoltmeter to the 2P connector marked F on RR channel BF-30.
9) Adjust KVR-z on BF-30 of the channel to indicate the meter between 2 and 4 mV.