
7.
Circuit Diagrams and PWB Layouts
Large Signal Panel: Audio Amplifier
A57
20V / div AC
2us / div
PM3394B
A59
10V / div DC
2us / div
PM3394B
A58
200mV / div DC
2ms / div
A56
200mV / div DC
2ms / div
PWM
STAGE2
G=2.5
PRE-AMP1
INTERGR 1
INTERGR 2
PWM
STAGE2
OSC
G=2.5
PRE-AMP2
PWM
STAGE2
G=2.5
PRE-AMP1
INTERGR 1
INTERGR 2
PWM
STAGE2
OSC
G=2.5
PRE-AMP2
B
A
4
9
2721 B1
2722 C1
2723 E6
2724 D1
8
7
6
5
9
3
4
8
7
6
5
3
2
1
2
1
7705 B5
7706 B5
7707 C4
7708 B9
SUBWOOFER
A3-A8-45
3726 E1
3727 E4
3728 F8
3729 F7
9706 C4
9717 A4
3755 F7
3752 F9
3734 D9
3735 C9
3736 D9
15W/8
Ω
15W/8
Ω
A8-19
OV
3737 C9
3738 C7
3739 C6
3740 B6
3741 E7
3742 D6
3743 E3
3744 E8
3745 D1
3746 C5
3747 B9
3748 A5
3749 A6
3750 F2
3751 F6
D
A
B
C
3790 B3
3791 B2
3792 B2
3793 B3
7704 B4
7703 B5
7702 C8
7701 B5
3798 C5
5701 E3
5702 E2
A8-14
L
5703 A3
5707 C1
5708 D1
5711 D4
5712 C4
5715 E9
5716 D9
5720 F7
5721 E8
5722 E6
5723 D6
5725 A9
6701 C5
6745 E1
7700 C3
1n
2704
5703
30R
A63
68u
7708
BC847B
3798
22K
3746
22K
3710
A59
2748
22K
3790
10K
2749
100p
2795
2790
100p
120K
3711
2746
4K7
1K2
3713
100n
10K
3797
2747
1K
3793
220n
2720
1K
3792
2759
1n
56K
3742
3740
4K7
A56
68K
3735
2777
220n
3729
100K
2K2
3750
A62
A57
2782
220n
A58
3737
4K7
220n
2785
A60
2717
680n
100p
2788
3739
68K
2709
470p
TDA7490
7702
120K
22n
3717
100K
3736
56K
220n
2762
3707
68K
47K
3747
2763
100n
2741
3734
10K
3791
68K
3722
330p
2728
1n
2727
220n
2783
2743
33n
220R
3709
2740
FEED4
19
GND
13
IN1
10
IN2
18
NC
20
OSC
8
OUT1
3
OUT2
23
STBY-MUTE
6
T1
11
T2
15
VREG
25
2753
220n
3733
470p
2710
83R
5725
A61
5712
83R
2789
100p
3716
47K
22p
2718
2744
33n
7704
BC847B
1735
EH-B
1
2
3
4
5702
33K
3703
5701
83R
5716
2726
83R
5711
2798 D9
3701 E5
3702 A5
3703 A5
3794 B7
3795 B8
3796 C7
3797 C8
3708 E5
3709 E4
3710 D3
9V6
OV
OV
-19V
15W/8
Ω
OV
3711 C4
3712 E2
3713 C5
3714 B4
3715 B5
3716 B5
3717 F3
3718 F3
3719 E9
3720 E6
3721 B1
3722 C1
3723 B1
3724 E1
3725 D2
2755 C7
2756 D6
2757 D6
2758 F7
3730 E6
3731 E9
3732 E7
3733 E7
2763 B7
2777 D1
2778 B4
CENTRE
AUDIO AMPLIFIER
R
2779 D1
2780 D4
2781 D4
2782 D6
2783 D9
2784 E6
2785 E9
2786 A2
2787 A7
2788 D1
2789 D1
2790 D1
2791 E9
2792 D9
2794 D6
2795 D6
2796 E6
2797 D9
2717 F3
2718 E2
2719 E4
2720 B2
3704 A5
3705 B2
3706 E5
3707 C5
2725 E8
2726 D2
2727 E2
A8-6
OV
OV
OV
OV
2728 D2
2729 F2
2740 F8
2741 E7
2742 E7
2743 E7
2744 E8
2745 E8
2746 E8
2747 D9
2748 E9
2749 B8
2750 C8
2751 A8
2753 B7
2754 B7
C
D
E
F
2759 E7
2760 C6
2761 C9
2762 B7
E
F
0044 F7
15W/8
Ω
A8-18
A8-13
0045 E5
1735 F2
1737 F9
1738 F6
2702 B3
2704 B2
2705 A5
2706 B3
2707 B2
2708 A2
2709 C5
2710 C4
2711 E1
2712 D4
2713 A5
2714 D3
2715 E3
2716 D3
2K2
3755
2791
220n
1K
3795
2792
220n
10K
3702
83R
5708
5722
83R
2758
680n
47K
3715
BC847B
7701
2721
470p
680n
2729
220R
3725
22K
BC847B
7703
220n
2779
3724
2u2
0044
5721
68u
2787
100n
2724
100n
7706
BC857B
2757
220R
3730
33n
2755
1n
1n
2725
0045
1K
3794
330p
2716
TDA7490
+5V
12
+VCC1
4
+VCC2
22
-5V
16
-VCC1
1
-VCC2
2
-VCC3
24
BOOT1
5
BOOT2
21
CURREF
14
FEED1
7
FEED2
9
FEED3
17
2778
4u7
7700
2708
220n
3719
220R
3720
220R
1K
3745
BZX384-C10
6745
1n
2754
2u2
33n
2714
2751
100n
1n
2723
56K
5723
83R
3712
10K
3723
1n
2750
1n
2712
100n
9
FEED2
17
FEED3
19
FEED4
13
GND
10
IN1
18
IN2
20
NC
8
OSC
3
OUT1
23
OUT2
6
STBY-MUTE
11
T1
15
T2
25
VREG
2702
12
+5V
4
+VCC1
22
+VCC2
16
-5V
1
-VCC1
2
-VCC2
24
-VCC3
5
BOOT1
21
BOOT2
14
CURREF
7
FEED1
6701
BAS216
15K
2786
22n
3727
220R
2781
220n
10K
3701
3708
3738
8R2
56K
1738
EH-B
1
2
3
5720
68u
100n
2706
3728
100K
470n
2705
7705
BC847B
EH-B
1737
1
2
3
1n
2715
2711
1n
220n
2780
2797
100p
2742
330p
470p
2760
BC847B
7707
22p
3732
22K
2761
470p
470p
2745 330p
3744
100K
2794
100p
100p
2796
2719
1n
10K
100K
3718
1K
3748
3749
1K
3704
10K
3796
470p
2722
3714
47K
4K7
3721
2707
100n
10K
3741
8R2
3705
9706
2756
470p
3731
220n
2784
220R
9717
3743
2K2
3706
5715
83R
3726
220R
680n
2798
100p
2713
470n
68u
5707
83R
2K2
3752
3751
2K2
+16V+19V
-Vf11
+16V+19V
-16V-19V
-Vs
-Vf2
-Vf11
-Vf21
-Vf1
-Vf21
-Vf2
-Vf2
-Vf11
-Vf1
PROT_AUDIOSUPPLY
+16V+19V
-Vf21
-Vf1
-16V-19V
POR
-16V-19V
+16V+19V
PROT1
PROT1
PROT1
-Vs
+16V+19V
PROT1
PROT1
-Vs
+16V+19V
AUDIO-R
-Vf2
AUDIO-SW
AUDIO-C
SOUND-ENABLE
-16V-19V
AUDIO-L
CL 26532041_015.eps
090402
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Summary of Contents for EM5A NTSC
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