Onkyo TX-SA705 Service Manual page 152

ADJUSTMENT PROCEDURE-1
IDLING CURRENT ADJUSTMENT
[When]
Exchange Power transistor (Q6050 - Q6056, Q6060 - Q6066) and/or Amplifier PC board (NAAF-9142).
[Procedure]
<Note> No load and No signal
Refer to <Fig-1> in " ADJUSTMENT PROCEDURE-2 " for 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,
using two 100 ohm resistors between the poles of the jig terminal and the dc voltmeter terminals.
DC voltmeter
3. Connect the ac power cord to wall outlet.
4. Press STANDBY/ON button to turn the power on.
5. Adjust the trimming resistors as the following procedure immediately after power on.
Channel
Center
Front Left
Front Right
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 the following procedure.
Channel
Front 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 to turn the power off.
10. Disconnect the ac power cord of the unit.
100 ohms
Jig terminal
1/4watts
Connect
Adjustment point
Mark
(Trimming resistor)
R6040
C
R6041
L
R6042
R
R6043
SL
R6044
SR
R6045
SBL
R6046
SBR
Adjustment point Measured value
R6041, R6042 In case below 9 mV
and R6040 In case 9 - 11 mV
In case over 11 mV
R6043, R6044, In case below 6 mV
In case 6 - 8 mV
In case over 8 mV
R6045 and R6046
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
No re-adjustment
11 mV
6 mV
No re-adjustment
8 mV
Idling currents are stabilized in about
10 minutes after power on.
TX-SR705/SA705
Specifications
( In a stable state)
12 +/- 3 mV
9 +/- 3 mV