TX-8522
ADJUSTMENT AND CONFIRMATION PROCEDURES 1
Idling current adjustment
Before Idling adjustment, turn the trimming resistors R587 and R588 to counter clockwise.
Connect the DC voltmeter to terminals P511 and P512.
After turn POWER to ON, adjust the trimming resistors R587 and R588 so that the reading of
voltmeter becomes 2.5 mV.
After adjustment, attach the top cover.
Confirm the voltage of points above after about five minutes.
When less than 4.5 mV, readjust the resistors above so that the voltage becomes 4.5 mV.
When 4.5 mV to 5.5 mV, you are not necessary to adjust.
When more than 5.5 mV, readjust the resistors above so that the voltage becomes 5.5 mV.
Confirmation of protection circuit
1. Confirmation of operation of speaker relay
Confirm that the speaker relays turn ON approximate. 5 seconds after the power switch is turned ON.
Confirm that the speaker relays turn OFF immediately after the power switch is turned OFF.
2. Confirmation of DC detection circuit
Press and hold down CD button, then press STANDBY/ON button.
After "Test- " on the FL tube light on, press DVD button to set the unit to "TEST-1 00".
Turn VOLUME to the maximum position. Apply DC 1.5 to 3V to CD terminal with no load.
Confirm that the speaker relay turns OFF.
Apply DC -1.5 to -3V to CD terminal with no load.
Confirm that the speaker relay turns OFF.
Caution: Don't apply DC voltage more than 1 sec..
P301
JL613A
P702B
P701B
P302
P303
P501
P512
R588
R587
JL918B
P511
JL711B
JL913B
JL716B
JL261B
P916B
P914B
P915B
U02
MAIN CIRCUIT
PC BOARD
(NAAF-8886)
