Adjustment Procedure - Integra DTR-7.7 Service Manual

QQ
3 7 63 1515 0

ADJUSTMENT PROCEDURE-1

IDLING CURRENT ADJUSTMENT
[When]
Exchanging the power transistor (Q6050 - Q6056, Q6060 - Q6066) and Amplifier PC board (NAAF-8678, NAAF-8682).
[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 current adjustment, turn the trimming resistors to counter clockwise.
2. Connect the dc voltmeter to the 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 a wall outlet.
4. Press the 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
TE
Surround Left
L 13942296513
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.
www
.
http://www.xiaoyu163.com
100 ohms
Jig terminal
1/4watts
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
In case 9 - 11 mV
and R6040
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
x ao u163
y
i
http://www.xiaoyu163.com
2 9
8
Test point
ID+
ID-
Connect
Measuring point
Adjustment value
(Test point)
P6080
2.5 mV
P6081
2.5 mV
P6082
2.5 mV
Q Q
P6083
1.5 mV
3 6 7 1 3 1 5
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
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 currents are stabilized in about
10 minutes after power on.
m
DTR-7.7
9 9
9 9