Onkyo TX-DS575X Service Manual page 13

1 Idling current adjustment
Before Idling adjustment, turn the trimming resistors R573, R574, R673, R674 and R1532 to counter clockwise,
Connect the DC voltmeter to sockets P511,P512, P611, P612 and P1511.
After tur POWER to ON, adjust the trimming resistors R573, R574, R673, R674 and R1532 so that
the reading of voltmeter becomes 2.50.2mV.
After adjustment, attach the top cover.
Confirm the voltage of above points after five minutes.
Readjust the above resistors so that the voltage becomes 6.5+0.2mV.
Note: No load and No signal
R673 R674 R1532
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Confirmation of protection circuit
1, Confirmation of operation of speaker relay
Confirm that the speaker relay turns ON approximate. 5 seconds after the power switch is turned ON.
Confirm that the speaker relay turns OFF immediately after the power switch is turned OFF.
2. Confizmation of DC detection circuit
Press and hold down CD button, then press SPEAKERS-A and SPEAKERS-B buttons at the same time.
During "TEST-" on the FL tube is displayed, press DVD button. Next, press CD button.(Refer to Test mode.)
Apply DC 1.5~3¥V to MULT] CHANNEL INPUT terminals with no load.
Confirm that the speaker relay turns OFF.
Apply DC -1.5~-3V to MULTI CHANNEL INPUT terminals with no load.
Confirm that the speaker relay turns OFF.
3. Confirmation of Current detection circuit
Press and hold down CD button, then press SPEAKERS-A and SPEAKERS-B buttons at the same time.
During "TEST-" on the FL tube is displayed, press DVD button. Next, press CD button.
Connect Differential circuit and apply the 50Hz square signal to the terminal of MULTI CHANNEL INPUT.
Adjust the attenuator or Volume so that the output level becomes 30V p-p.
Confirm that the speaker relay turns OFF when a 1.5 ohm load is connected.