Adjustment Procedure - Onkyo TX-SR573 Service Manual

ADJUSTMENT PROCEDURE-1

IDLING CURRENT ADJUSTMENT
[When]
1. Exchange Power transistors (Q6050 - Q6066).
2. Exchange Amplifier PC board ass'y (NAAF-8523).
[Procedure]
<Note> No load and No signal
Refer to " ADJUSTMENT PROCEDURE-2 " about the adjustment points and the test points.
1. Before idling adjustment, turn the trimming resistors to counter clockwise.
2. Connect the DC voltmeter to test points.
Connect 100 ohm resistance near the terminal of the two poles of a Jig terminal.
DC voltmeter
3. Connect the AC power cord to wall outlet.
4. Press the STANDBY/ON button into the power on.
5. Adjust the trimming resistors as following procedure immediately after power on.
Channel
Left
Right
Center
Surround Left
Surround Right
Surround Back Left
Surround Back Right
6. Wait for 4 - 6 minutes. (Heat running)
7. Re-adjust the trimming resistors as following procedure.
Channel
Left, Right and
Center
Surround Left
Surround Right
Surround Back Left
Surround Back Right
8. Disconnect the DC voltmeter.
9. Press the STANDBY/ON button into the power off.
10. Disconnect the AC power cord.
100 ohms
Jig terminal
1/4watts
Adjustment point
Mark
(Trimming resistor)
R6040
L
R6041
R
R6042
C
R6043
SL
R6044
SR
R6045
SBL
R6046
SBR
Adjustment point Measured value
In case below 9 mV
R6040, R6041 and
R6042 In case 9 - 11 mV
In case over 11 mV
In case below 6 mV
R6043, R6044,
In case 6 - 8 mV
R6045 and R6046
In case over 8 mV
Test point
ID+
ID-
Measuring point
Adjustment value
(Test point)
P6080
2.5 mV
P6081
2.5 mV
P6082
2.5 mV
P6083
1.5 mV
P6084
1.5 mV
P6085
1.5 mV
P6086
1.5 mV
Adjustment value
9 mV
Leave it as it is
11 mV
6 mV
Leave it as it is
8 mV
Idling current are stabilized in about
10 minutes after a power supply ON.
TX-SR573
Specifications
( In a stable state)
12 +/- 3 mV
9 +/- 3 mV