Idling Current Adjustment; Adjustment Procedure - Onkyo HT-R430 Service Manual

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 Mark
L
Left
R
Right
C
Center
SL
Surround Left
SR
Surround Right
SBL
Surround Back
6. Wait for 4 - 6 minutes. (Heat running)
7. Re-adjust the trimming resistors as following procedure.
Channel Adjustment point
Left, Right R6040, R6041 and
and Center R6042
Surround Left, R6043, R6044 and
Surround Right and R6045
Surround Back
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 Measuring point
(Trimming resistor) (Test point)
R6040 P6080
R6041 P6081
R6042 P6082
R6043 P6083
R6044 P6084
R6045 P6085
Measured value
In case below 9 mV
In case 9 - 11 mV
In case over 11 mV
In case below 6 mV
In case 6 - 8 mV
In case over 8 mV
Test point
ID+
ID-
Adjustment value
2.5 mV
2.5 mV
2.5 mV
1.5 mV
1.5 mV
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.
HT-R430
Specifications
( In a stable state)
12 +/- 3 mV
9 +/- 3 mV