ADJUSTMENT PROCEDURES-1
IDLING CURRENT ADJUSTMENT
DTR-7.8
[Procedure]
<Note> No load and No signal
Refer to
<Fig-1, 2, 3>
in " ADJUSTMENT PROCEDURE-2, 3, 4 " 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.
6. Wait for
4 to 6
minutes for heat running.
7. Re-adjust the trimming resistors as the following procedure.
Adjustment point
(Trimming resistor)
R6040
R6041
R6042
R6043
R6044
R6045
R6046
Adjustment value
3.0 mV
3.0 mV
3.0 mV
3.0 mV
3.0 mV
3.0 mV
3.0 mV
Measuring point
(Test point)
P6070
P6071
P6072
P6073
P6074
P6075
P6076
Adjustment point
R6040, R6041
and R6042
R6043
R6044
R6045
R6046
Adjustment value
3 mV
No re-adjustment
4 mV
Measured value
In case below
3 mV
In case
3 - 4 mV
In case over
4 mV
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
Front Left
Front Right
Center
Surround Left
Surround Right
Surround Back Left
Surround Back Right
Channel
Front Left, Right
and Center
Surround Left
Surround Right
Surround Back Left
Surround Back Right
ID-
ID+
Test point
DC voltmeter
Jig terminal
100 ohms
1/4watts
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 from the wall outlet.
Specifications
( In a stable state)
3 +/- 1 mV
Idling currents are stabilized in about
10 minutes after power on.
[When]
Mark
L
R
C
SL
SR
SBL
SBR
Connect
1. Exchange power transistors (Q6050 - 6056, Q6060 - 6066, Q6080 - 6086, Q6090 - 6096).
2. Exchange amplifier PC board ass'y (NAAMP-9061, 9062, NACLA-9063 - 9069).