Onkyo TX-L55, Руководство по обслуживанию

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TX-L55/LR552
ADJUSTMENT AND CONFIRMATION PROCEDURES
1.Offset voltage adjustment
Connect the DC voltmeter to speker terminal.
Adjust the trimming resistors R5121 to R5126 so that the reading of
voltmeter becomes 0+/-100mV.
Note: No load and No signal
R5125
C
R5126
SB
R5124
SR
R5123
SL
R5122
FR
R5121
FL
NAAF-8350
Confirmation of protection circuit
1. Confirmation of speaker relay
Confirm that the speaker relays turn ON approximately 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. How to enter Test Mode
1. To enter a test mode (Test 1 to 4), when the unit is turned on,
hold down "LISTENING" button and then press "STANDBY/ON" button.
2. After "Test- " lights on FL tube, press "INPUT UP" to set "test-1-00".
CR
OSCILLATOR
DIFFEREN-
TIATING
CIRCUIT
ATTENU-
ATOR
UNIT
SPEAKER
TERMINAL
DVD CHANNEL
INPUT
INPUT
OUT-
PUT
3.3k
10k
1SS133x6 3.3k
GND
0.01 F
0.1 F
OSCILLO-
SCOPE
Differentiating Circuit
200Hz
SQUARE
35Vp-p
3. Confirmation of Current detection circuit
Set the unit to "Test-1-00".
Connect the differentiating circuit and apply the 200Hz square signal to DVD INPUT terminal
of each channel.
Adjust the attenuator or Volume so that the output level becomes 35V p-p.
Confirm that the speaker relay does not turn OFF when a 3.0 ohm load is connected.
Confirm that the speaker relay turns off when a 1.5 ohm load is connected.
Caution:Don't continue more than 3 seconds.