Adjustment Procedures; Idling Current Adjustment; No Load And No Signal - Onkyo HT-R320 Service Manual

ADJUSTMENT PROCEDURES

IDLING CURRENT ADJUSTMENT

[Note] No load and No signal
Refer to Fig-1 about test points and adjustment points.
1. Before Idling adjustment, turn the trimming resistors R6040, R6041, R6042, R6043 and R6044 to counter clockwise.
2. Connect the DC voltmeter to test point P6080,P6081, P6082, P6083 and P6084.
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 a power ON.
Trimming resistor
Channel
(Adjustment point)
R6040
L
R6041
R
R6042
C
R6043
SL
R6044
SR
6. Wait for 4 - 5 minutes.
7. Re-adjust the trimming resistors as following procedure.
Channel Adjustment point
L, R,
R6040, R6041
C
R6042
SL, SR
R6043, R6044
8. Disconnect the DC voltmeter.
9. Press the STANDBY/ON button into the power OFF.
10. Disconnect the AC power cord.
BIAS
Fig-1
U17 POWER AMPLIFIER PC BOARD
(NAAF-7875)
100 ohms
Jig terminal
1/4 watts
Test point
(Measuring point)
P6080
P6081
P6082
P6083
P6084
Measured value
In case below 7 mV
In case 7 - 9 mV
In case over 9 mV
In case below 4 mV
In case 4 - 9 mV
In case over 9 mV
In case below 4 mV
In case 4 - 6 mV
In case over 6 mV
R
L
P6080
R6040
R6041
BIAS
B C E
0 2
1 2
3 0 1 2
1 7 2 5
2 5
7 1
2 2 0 2
0 2
2 2 0 2
0 3
E
R6041
BIAS R6040 P6080 BIAS P6081
7 7
R
L
C6234
J010
C6901 C6902
R6604
J6005
R6605
J6006
Q6603
R6603
Q6602
R6602
Q6601
E
7 1
2 7
Test point
ID+
ID-
Adjustment value
2.5 mV
2.5 mV
2.5 mV
1.5 mV
1.5 mV
Adjustment value
7 mV
Leave it as it is
9 mV
4 mV
Leave it as it is
9 mV
4 mV
Leave it as it is
6 mV
C
P6081
P6082
R6042
BIAS
E
B C E C E
2 5
R6044
BIAS R6042 P6082 BIAS R6043 P6083 BIAS
7 7 7
C LS RS
NCAF-7875
1 25137875A
7
7
LS
P6083
R6043
BIAS BIAS
Specification
10 +/- 3 mV
10 +/- 3 mV
7 +/- 3 mV
Front side
P6084
RS
P6084
R6044
HT-R320