R569
R570
R568
R567
R561
R562
L502
L502
C
51
7
R
56
5
R
56
4
D911
C914
C914
R
56
3
P502A
C
91
9
R708
D
91
8
C
92
0
C
92
0
C917
C916
D
70
7
R
91
4
R915
D913
D912
L5
01
L5
01
C915
C915
P
90
2B
B
B
B
C
C
C
C
E
E
E
P504
IID
R912
R913
J547
J541
J545
J539
J537
R560
R558
R556
J536
J543
R
57
6
Q522
Q530
Q520
Q518
Q516
R546
R550
R548
R544
R574
R
57
2
R
57
5
C515
R555
R559
Q519
Q
52
1
Q
51
5
Q529
Q517
R
55
3
R
55
1
R
54
5
R
54
3
R
57
1
R
57
3
J542
R
54
9
R
55
4
C518
R566
J540
C
51
6
R
55
2
J529
J544
J546
J528
P503
J548
JL
58
2B
R
59
5
J5
14
J5
15
J519
J518
J517
R594
R596
R593
P501A
J5
24
J538
J9
01
P586A
P
58
5A
J520
J516
J522
J521
J523
R547
J535
R557
L505
L503
L506
J5
54
L504
J5
30
J04A
J03A
C
53
1
Q
53
2
R
60
3
R
60
1
R
60
5
R
60
7
R
60
8
C
53
2
R602
Q
53
1
R604
J03B
J0
4B
R
60
6
R610
C533
Q533
R
73
9
R740
J5
49
J527
J902
+B
-B
Q523
Q527
E
B
Q525
Q526
Q528
Q524
J5
50
+Vcc
-Vcc
ID
ID
UP
UP
J5
31
J5
32
J5
33
J534
P591B
P592B
P591A
P592A
C912
C913
J05B
P911B
P912B
/P914B /P913B
Trimming resistor
R576
Test point
P504
Trimming resistor
R575
Test point
P503
Rch
Lch
Main circuit PC board
NADG-6630
1. Before Idling adjustment, turn the trimming resistors R575, R576 to counter clockwise.
2. Connect the DC voltmeter to terminal P503, P504.
3. After turn POWER to ON, adjust the trimming resistors R575, R576 so that the reading
of voltmeter becomes 2.0 mV.
4. After adjustment, attach the top cover.
5. Confirm the voltage of above points after five minutes.
6. When less than 2.5 mV : Readjust the trimming resistors above so that the voltage becomes 3.0 mV.
When 2.6 mV to 4.0 mV : It is not necessary to adjust.
When more than 4.1 mV : Readjust the trimming resistors above so that the voltage becomes 3.5 mV.
Note:No load and No signal
GND
10k
1SS133
3.3k
0.01 F
Output
GND
Unit
Speaker
terminal
Load
Oscillo-
scope
Attenuator
Differentiator
CD
Terminal
35Vp-p
Differentiator
Confirmation of Current detection circuit
1.Connect Differentiator below and apply the 50Hz square signal to the CD terminal.
2.Adjust the attenuator or Volume so that the output level becomes 35V p-p.
3.Confirm that the speaker relay turns OFF when a 0.5 ohm load is connected.
ADJUSTMENT PROCEDUERS
IDLING CURRENT ADJUSTMENT
CONFIRMATION OF PROTECTION CIRCUIT
CONFIRMATION
A-905TX
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