Adjustment Procedure - Integra DTR-5.9 Service Manual

ADJUSTMENT PROCEDURE-1

IDLING CURRENT ADJUSTMENT
[When]
1. Exchange Power transistor (Q6050 - Q6056, Q6060 - Q6066).
2. Amplifier PC board (NAAF-9424).
[Procedure]
Refer to "ADJUSTMENT PROCEDURE-2 " for the adjustment points and the test points.
<Note> No load and No signal
1. Before idling adjustment, turn the trimming resistors fully 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 a wall outlet. And press On/Standby button to turn the power on.
4. Adjust the trimming resistors as the following procedure immediately after power on.
Channel
Front Left
Front Right
Center
Surround Left
Surround Right
Surround Back Left
Surround Back Right
5. Wait for 4 - 6 minutes. (Heat running)
6. Re-adjust the trimming resistors as the following procedure.
Channel
Front Left, Front Right
and Center
Surround Left
Surround Right
Surround Back Left
Surround Back Right
<Notes>
Idling currents are stabilized in about 10 minutes after power on.
7. Disconnect the dc voltmeter.
8. Press button to turn the power off. And disconnect the ac power cord.
On/Standby
100 ohms
Jig terminal
(1/4 watt)
Adjustment point Test point
R6040 R6040 P6080 P6080
R6041 R6041 P6081 P6081
R6042 R6042 P6082 P6082
R6043 R6043 P6083 P6083
R6044 R6044 P6084 P6084
R6045 R6045 P6085 P6085
R6046 R6046 P6086 P6086
Measured value Adjustment value
In below 9 mV 9 mV 9 mV
In case 9 - 11 mV Leave it as it is Leave it as it is
In case over 11 mV 11 mV 11 mV
In case below 6 mV 6 mV 6 mV
In case 6 - 8 mV Leave it as it is Leave it as it is
In case over 8 mV 8 mV 8 mV
Test point
ID+
ID-
Adjustment value
2.5 mV 2.5 mV
1.5 mV 1.5 mV
Specifications
12 +/- 3 mV 12 +/- 3
9 +/- 3 mV 9 +/- 3
DTR-5.9