Adjustment Procedure - Onkyo HT-R430 Service Manual

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ADJUSTMENT PROCEDURE-1

IDLING CURRENT ADJUSTMENT
[When]
1. Exchange Power transistors (Q6051 - Q6065).
2. Power amplifier PC board ass'y (NAAF-8523).
[Procedure]
<Note> No load and No signal
Refer to "ADJUSTMENT PROCEDURES-2" about the adjustment points and the measuring 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
TE
L 13942296513
Center
Surround Left
Surround Right
Surround Back
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 and
Surround Back
8. Disconnect the DC voltmeter.
9. Press the STANDBY/ON button into the power off.
10. Disconnect the AC power cord.
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100 ohms
Jig terminal
1/4watts
Adjustment point
Mark
(Trimming resistor)
R6040
L
R6041
R
C R6042
SL R6043
R6044
SR
R6045
SBL
Adjustment point Measured value
In case below 9 mV
R6040, R6041 and
In case 9 - 11 mV
R6042
In case over 11 mV
In case below 6 mV
R6043, R6044 and
R6045 In case 6 - 8 mV
In case over 8 mV
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2 9
8
Test point
ID+
ID-
Measuring point
Adjustment value
(Test point)
P6080
2.5 mV
P6081
2.5 mV
Q Q
3 6 7 1 3 1 5
P6082 2.5 mV
P6083 1.5 mV
P6084
1.5 mV
P6085 1.5 mV
Adjustment value
9 mV
Leave it as it is
11 mV
6 mV
Leave it as it is
8 mV
co
.
9 4 2 8
0 5 8 2 9 9 4 2 8
Specifications
( In a stable state)
12 +/- 3 mV
9 +/- 3 mV
Idling current are stabilized in about
10 minutes after a power supply on.
m
HT-R430
9 9
9 9