Sansui AU D5 D7 Service Manual

Page 1

AU-D7/ D5

O SPECIFICATIONS

(AU-07>

Power output

Min. RMS,both channels driven, from 20 to 20,000 Hz,with no more

than 0.02 96 total harmonic distortion.

80 watts per channel into 8 ohms

Load impedance ............. 8 ohms

Total harmonic distortion ........ less than 0.02 16 at or below
rated min. RMS power output

lntennoduletion distortion (60 Hz : 7 kHz - 4:1 SMPTE method)

..................... lea than 0.02 96 at rated
Frequency mouse (at 1 watt)
Overall (from AUX) ......... DC to 310,00.) Hz. +0 d8.
-3.0 dB

RIAA cum deviation (PHONO-MM. 20 Hz to 20 kHz)
..... . , . . +0.5 dB. -0.5 dB (REC OUT)
at. time ................. 0.8 usec
Slew rate ................. 1120 V/usac
Damping factor (1 kHz. both channels driven)
..................... 200 into 8 ohms

INTEGRATED STEREO AMPLIFIER :Z...Es.2.~mzm....
LINEAR & DD/DC .. ........

(Max. input capability, 200 mV at 1 kHz. less than 0.1 16 total
harmonic distortion)
AUX, TUNER, TAPE PLAY-1, 2 . 200 rnV/47 kilohms

Output level and impedance (1000 Hz)
TAPE REC-1, 2 ............ 200 mV into 47 kilohmsl
- 600 ohms
Channel separation 11 kHz. at rated power output)

PHONOMM ............. 56 d8
AUX. TUNER, TAPE PLAY-1, 2 . 90 dB
Sigrid to nob ratio (shortcircuit. A-network)
PHONO-MC .............. 67 dB
PHONOMM ............. 86 d8
AUX, TUNER, TAPE PLAY-1, 2 . 110 dB
Controls (VOLUME. 4!) dB position)

SUPER BASS ............. 26d8 at 10 Hz
BASS ................. :8 dB at 100 Hz
PRESENCE .............. t6dB at 12 kHz
TREBLE ............... thBlt 15 kHz
LOUDNESS .............. +8 dB at 50 Hz
+6dB at 10 kHr
Power requirements
Ii".- -:"J 1:1 Power voltage ...... ....... 120, 220. 240 V (50/60 Hz)
For U.S.A. 8i Canada ........ 120 V 1% Hz)
:1 D Power accustom
Rated consumption ......... 270 watts 340 VA
__ Maximum consumption ....... 380 watts
£3 C3 Dimensions ................ 430 mm (18-15/16") W
148 mm (5-7/8) H
:3 D 328 mm (12-15/16) 0
35553 a Using rack mounting adaptors . . . 4% mm (18-15/16") W
_... 148 mm (5-7/8") H
Li '23 ammmiiaa/a"io
warn
Silver panel type ........... 11.3 kg (24.9 lbs) net
_ 12.8 kg (27.8 lbs) packed
Black panel type ........... 11.5 kg (25.4 lbs) net
128 ltg (28.2 lbs) packed
(AU-05>

Power output
Min RMS, both channels driven. from 20 to 20.000 Hz_with no more
than 0.02 56 total harmonic distortion.
65 watts per channel into 8 ohms
Load impedance ........... . 8 ohms
Total harmonic distortion . . . . . . less than 0.02 36 at or below
rated min. RMS power output
Intermodulation distortion (60 Hz 7 kHz = 4 1 SMPTE method)
, _ . . . . . .......... less than 0.02 96 at rated
Fraquancy response (at 1 watt)
Overall ((rom AUX) ...... DC to 330.0(1) Hz, *0 d8,
-3.0 dB
RIAA curve deviation (PHONO-MM. 20 Hz to 20 kHz)
. +0.2 dB. -02 dB
Riaetima. ,...,.,....0.6usec
Slew rate . . . . . :120 Vlusec
Damping factor (1 kHz, both channels driven)
.. . ,. .200int080hms
Input sensitivity and impedance (at 1 kHz)
PHONOMC . . . . . 250 uV/100 ohms
(Max input capabiiity; 15 mV at 1 kHz, less than 0.1 96 total
harmonic distortion)
PHONOMM . . . . . . . 2.5 mVI'47 kilohms
(Max input capability, 200 mV at 1 kHz. less than 0.1 96 total
harmonic distortion)
AUX, TUNER. TAPE PLAY-1, 2 . 200 HIV/47 kilohms
Output level and impedance (1,000 Hz)

TAPE REC-1, 2 200 mV into 47 kilohms/
600 ohms
Channel separation (1 kHz, at rated power output)
PHONO-MM 55 d8

AUX, TUNER, TAPE PLAY-1 , 2 . 90d8
Signal to noise ratio (shortcurcun. A-network)
PHONO-MC . 67 d8
PHONO-MM . . , . ..... 86 d8
AUX,TUNER.TAPE PLAY-1,2 . 110d8
ControIs (VOLUME ~30d8 position)

SUPER BASS . . . . . :GdB at 10 Hz
BASS . . . _._.. zGdBat IOOHz
PRESENCE _ . . . , . :6d8 at 1.2 kHz
TREBLE . . . . . . ..... sGdB at 15kHz
LOUDNESS. .. . .... tGdBatSOHz
+6 dB at 10 kHz
Powarrequirernents
Power voltage ............. 100, 120, 220, 240 V (50/83 Hz)
For U.S.A. 8i Canada ....... 120 V (60 Hz)
Power consumption
Rated consumption ........ 250 watts 500 VA
Maximum consumption ...... 350 watts
Dimensions ................ 43) mm (1645/16")W

148 mm (5-7/8") H
328 mm (12.15/16) 0
using rad: m0unting adaptors. . . . 430 mm (18.15/16") W
148 mm (5-7/8") H
339 mm (13~3/8") 0
WOW
silver penal type ........... 9.6 kg (21.2 lbs) net
10.9 kg (24.0 lbs) packed

SANSUI ELECTRIC CO., LTD. °"°" ""V """""" ifikfifiéfs'iima

' Design and Mieations subject to charges without notice for
improvements.

Page 2

1. BLOCK DIAGRAM

(MM/MC)
Equalizer

Recout Selector

2. OPERATIONS

TA73|8P

Pawer ' II Phone
Display Sw

Speakers Sw

2-1. Occurrence of switching distortion in a B-class amplifier and its prevention circuit

(Operation of super linear A-class circuit)

In general, when bi-polar transistors are operated in a B-class ampli-
fier, the switching distortion is inevitably produced. There exist a
few circuits which can eliminate this switching distortion; however,
a remarkable effect has been achieved on reducing the switching dis-
tortion by using two-transistor circuit designed by SANSUI.

A. Occurrence of switching distortion in a B-class amplifier
1) Bias voltage when no signal is applied

In order to operate a B-class amplifier, it is necessary to keep a small
current flowing through the power transistors. Therefore, a bias
voltage should be applied to the transistors.

Fig. 1 shows how the bias voltage is developed when no signal is ap-
plied.

* First, the bias voltage between points ® and at the power
stage is a constant voltage of 2.4V.

* Next, looking through the bias voltage distribution over the
power stage, since a very small current is flowing when no signal
is applied, the voltage drop across the emitter resistor RE is as
small as can be considered to be negligible. Accordingly, each
voltage between points ® and © or between points. and (Q
is equal to the sum total 1.2V of two base-emitter voltages Vac
of TR] and TR3 or TR2 and TR4, respectively. In addition, the
voltage between the middle point © and the ground is zero.

Fig. l

1-®-l-K

2) Bias voltage in operation and occurrence of switching distortion
(See Fig. 2)

Now, when a signal current is passed through the NPN type power
transistor TRl , the base-emitter voltages VBE of TM and TR3 and
the voltage across the emitter resistor RE also increase. Accordingly,
the voltage between points ® and © changes to 1.9V. On the
other hand, since the voltage between points ® and . is main-
tained at 2.4V, only a voltage of 0.5V is applied to between two
points and © as the bias voltage of the PNP type power transis-
tors TR2 and TR4. Therefore, the transistors TR2 and TR4 are kept
in a cut-off state or a reverse bias state. Fig. 3 shows this condition,
indicating that the switching of push-pull operation is in a critical
state.

Fig. 2 +9
@
T__
TR:
RE IA
2.4V __:- ll 0-50 RLO.20
1- R l I
915V ' 0:50 lfv
.6 IV -3,w '
g ' Km:
0.6V
1- -l-<|< rm
'8
Fig. 3 Fig 4