9-3
9-3
0071 E1
0072 E3
1702 A5
1707 B8
1709 A7
1710 A7
1711 E8
1719 A3
1721 A4
2701 E8
2702 E8
2703 E2
2704 C6
2705 E6
2706 B5
2707 B3
2708 A3
2709 D2
2710 C2
2711 A2
2712 C6
2713 E5
2714 D5
2715 B4
2716 A3
2718 D7
2719 D5
2720 B4
2721 E6
2722 E5
2723 E7
2724 E7
2725 A6
2726 A6
2727 D8
2728 C5
2729 E5
2730 D4
2731 D5
2732 D7
2733 B6
2734 E7
2735 C7
2737 E6
2738 D7
2740 A5
2741 A6
2743 A1
2744 C2
2745 A1
2747 B2
2748 D7
2749 B7
2751 A3
2752 C8
2753 D4
2754 D4
2755 B4
2756 C4
2759 A8
2760 A8
2761 B5
2762 C7
2763 E7
3701 E8
3702 D3
3703 E2
3704 D2
3705 D2
3706 D6
3707 E6
3708 E5
3709 E6
3711 A5
3712 B5
3713 B8
3714 C7
3715 C8
3716 D8
3717 B5
3718 C5
3719 C5
3720 C5
3721 C5
3722 C5
3724 A5
3725 C8
3726 B8
3727 A5
3728 C7
3729 D7
3730 C7
3731 D6
3732 A3
3733 A4
3734 A3
3735 B3
3736 A4
3737 B2
3738 B2
3740 B2
3741 A2
3742 B1
3743 B1
3745 A2
3746 A1
3747 B2
3748 C1
3749 C7
3750 C6
3752 B6
3753 D5
3754 A7
3755 A6
3756 A7
3757 B7
3758 E2
3759 E5
3760 E4
3761 C3
3763 D2
3764 B4
3765 A6
3766 B7
3767 A7
3768 C3
3769 C4
3770 C3
3771 E4
3772 E5
3773 B4
3774 C4
3775 C4
3776 C4
3777 C4
3778 D6
3779 B3
3780 C1
3781 D4
3782 E7
3785 E6
3786 C2
3787 E6
3788 C7
3789 B7
3790 D3
3791 D3
3792 D3
3793 E4
5701 E7
6703 D6
6706 E4
6707 E4
6708 E4
6709 D4
7701 D2
7702 D3
7704 E6
7709 B3
7710 B2
7711 C1
7712 B6
7713 A5
7714 A7
7715 B7
7716 B6
7717 C3
7718 B4
7719 B4
7722 C3
9717 E8
9720 C3
9730 E7
9733 E3
9736 E3
9737 D4
9740 B2
9747 C7
9750 B8
9751 B8
9752 D8
9753 D7
9754 B5
9755 A5
9756 A5
9757 D1
9758 E3
9759 E3
9760 E4
9762 B7
E
B
C
ECO MTF DD stage .4, 240699
These assembly drawings show a summary
of all possible versions.
For components used in a specific version
see schematic diagram respectively partslist.
RECORDER BOARD / componentside view
+ Motor
Motor +
B
A
+3
Mot. GND
Motor-
switch A
PB Info A
8
1
Rec/PB switch
SPEED
Rec/PB s
witc
h
SPEED
C
B
E
ECO MTF DD stage .4, 240699
RECORDER BOARD / copperside view
0071 B1
0072 A3
1702 E4
1707 B8
1709 E8
1710 E8
1711 A8
1719 E3
1721 E4
2701 A8
2702 A8
2703 A2
2704 C6
2705 A6
2706 D5
2707 C3
2708 E3
2709 B2
2710 C2
2711 E2
2712 C6
2713 A5
2714 B5
2715 D4
2716 D4
2718 B7
2719 B5
2720 D4
2721 A6
2722 A5
2723 A7
2724 A7
2725 D6
2726 E6
2727 B8
2728 C5
2729 A6
2730 B4
2731 B5
2732 B7
2733 D6
2734 A7
2735 C7
2737 B6
2738 B7
2740 E6
2741 E6
2743 E1
2744 C2
2745 E1
2747 D2
2748 B7
2749 D6
2751 E3
2752 C8
2753 B4
2754 B3
2755 D5
2756 C4
2759 E8
2760 E8
2761 D5
2762 C7
2763 A7
3701 A8
3702 A3
3703 A2
3704 B2
3705 B2
3706 B5
3707 A6
3708 A5
3709 A6
3711 E5
3712 E5
3713 D8
3714 C7
3715 B8
3716 B8
3717 E5
3718 C5
3719 C5
3720 D4
3721 C5
3722 C5
3724 E6
3725 C8
3726 D8
3727 D5
3728 C7
3729 B7
3730 C7
3731 B5
3732 E3
3733 E4
3734 E3
3735 D3
3736 E4
3737 D2
3738 D2
3740 D2
3741 D1
3742 E1
3743 E1
3745 E2
3746 D1
3747 D2
3748 C1
3749 C7
3750 C6
3752 D6
3753 A4
3754 E7
3755 E6
3756 E7
3757 E7
3758 A2
3759 A5
3760 A4
3761 C3
3763 B2
3764 E4
3765 E6
3766 D7
3767 E7
3768 C3
3769 C4
3770 C3
3771 A4
3772 A5
3773 D4
3774 D4
3775 C4
3776 C4
3777 C4
3778 B6
3779 D3
3780 C2
3781 B4
3782 A7
3785 A6
3786 C2
3787 A6
3788 C8
3789 D7
3790 B3
3791 B2
3792 B3
3793 A5
5701 A7
6703 B6
6706 A4
6707 A4
6708 A4
6709 B4
7701 B2
7702 B3
7704 A6
7709 D3
7710 D2
7711 C1
7712 C6
7713 E5
7714 E7
7715 D7
7716 D6
7717 C3
7718 D4
7719 D4
7722 C3
9717 A8
9720 C3
9730 A7
9733 A3
9736 A3
9737 B4
9740 D2
9747 C7
9750 E8
9751 D8
9752 B8
9753 B7
9754 D5
9755 E6
9756 E5
9757 B1
9758 A3
9759 A3
9760 A4
9762 D7
HS
DUBBING
REC INFO
REC INFO
+1
GND
+ MOTOR
+ TAPE
R OUT
L OUT
GND
L IN
R IN
PB INFO
+ Motor
Motor +
B
A
+3
Mot. GND
Motor-
switch A
PB Info A
1
2
4
3
5
Playback
LEFT RIGHT
mV-meter
Check
limits see fig.1
SBC420
(4822 397 30071)
CHECK
PLAYBACK
FREQUENCY RESPONSE
General
TEST
CASSETTE
RECORDER
MODE
MEASURE
ON
READ ON
ADJUST
with to
ADJUST
MOTOR SPEED
SBC420
(4822 397 30071)
3150Hz
PLAY
deck A or B
PLAY
deck A or B
or
LEFT RIGHT
frequency
counter
3758
SBC420
(4822 397 30071)
3150Hz
LEFT RIGHT
SBC420
(4822 397 30071)
10kHz
LEFT RIGHT
PLAY deck A
W&F-meter check only
mV-meter
or
oscilloscope
left hand screw
max. output level
& left=right
CHECK
WOW & FLUTTER
ADJUST
AZIMUTH
3150Hz
±
1%
≤
0.4 % DIN or
≤
0.35 % CCIR
figure. 1
f(Hz)
level(dB)
8dB
6dB
10k
4k
250
80
8dB
or
headphone socket
or
headphone socket
or
headphone socket
PLAY deck B
PLAY deck A
PLAY deck B
figure. 2
f(Hz)
level(dB)
6dB
10k
4k
250
100
8dB
(10dB HSD)
8dB
(10dB HSD)
adj. ECO MTF DD AS, 110399
1
2
or
1
2
1
2
or
1
2
Recording
mV-meter
5701
RECORDED
CASSETTE
LEFT RIGHT
PLAY
mV-meter check only limits see fig.2
FERRO
FERRO
RECORDED
CASSETTE
LEFT RIGHT
PLAY
THD-meter check only
≤
5%
PRE-ADJUST
BIAS
Input signal: 3mV
100Hz, 250Hz, 1kHz,
10kHz
via 3 or 4
CHECK
OVERALL
FREQUENCY RESPONSE
CHECK
DISTORTION
Input signal: 300mV
1kHz
via 3 or 4
Remark: If high frequencies are not within lower limit, decrease bias and re-measure.
If distortion is too high increase bias and re-measure.
14Vrms
(40Vpp)
RECORD
RECORD
RECORD
FERRO
5
or
1
2
or
1
2
SPR 00 0052
