Sansui G 4500 Service Manual

Page 1

6-4500/401

SPECIFICATIONS

6-3500/301
Audio section
Power output
Min. RMS both channels driven, from 20 to 20,000 Hz, with no
more than 0.1% total harmonic distortion.

26 walls per channel into 8 ohms
Load impedance ..... 8 ohms
Total harmonic distortion

t . . . ....... less than 0.i%3t or below rated min,

RMS power output
lntermodulation distortion (70 H2 : 7kHz = 4:15MPTE method)
load
Input sensitivity and impedance (1 kHz, for rated power output)
AUX, TAPE . . , » 150 mV/47 kilohms
x MIC t . t 8 mV/IO kilohms
PHONO . i better than 50 dB
AUX . . t better than so dB
Controls '
BASS .. i. t :10 dB (50 Hz)

, . ' .............. less than (11%
Frequency response (at 1 watt)
10 to 50,000 H2 *1 dB -2 £13
I PHONO)
.t . +0.5 dB ~0.5 dB (3010 l5,000 H1)
Damping factor. _ . , . approximately 30 at thm
6-4500/401 PHONO ...... . 2,5 mV/47 kilohms
(Max 'nputcapab tty 200 mV at l kHz, less than 0596mm
harmonic distortion)
Output level (1 kHz)
TAPE REC (pin jack) . 150 mV/47 kilohms
Channel separation (1 kHz, at rated power output)
Hum and Horse (short-circuit, A network)
PHONO . . . 75 dB
AUX , . t V . 95 a3
TREBLE .. :lOdBllOkHz)
LOUDNESS (-30 dB} 7 I133! 50 H2
5 dB at 10 kHz

4w... . mutwfl, RM elem.

FM section

Tuning range ..... , t . 88 to 108 MHZ

Usable scnsitivitv
Mona [HF . ..... 11.0 dBfllBSnV}

DIN t . . . . L2 uV

StereoiHF t 19,0dBf

50 dB Quieting sensitivity
Mono . , . . IS dBf
Stereo . . ..... 38 dBf

Signal to noise ta: 0 (at 65 um)
Mona t . . . 7] dB
Stereo t . t 68 GB

Distortion (at 65 def)

one .......

4 less than 0.18% at 100 Hz ,
less than 0.13% at 1,000 HZ
less than 0.25% at 5,000 Hz ,
Stereo ......... less than 0.3% 32100 Hz

less than 0.25% at 1,000 Hz
less than 0.3% at 6,000 Hz

Alternate channel selectivity (at 400 kHz)

...... t . . . 50 dB

Caplureratlo , i . . L3 413

Image response ratio t t , 48 dB (ates MHz)

Spurious response ratio 70 dB (at 93 MHz)

Stereo separation. A . . t 30 dB at IO!) Hz

40 d3 at1,000 H1

28 dB at l0,000 HZ

30 to l5,000 H2 +05 dB 71.0 dB

Frequency response . . ,

Antenna input impedance
. . .......... 300 ohms bzlanced

75 ohms unbalanced

AM section

. , ..... 530m 500 kHz
tY (Bar antenna)

, . so dB/m (300 iiV/m)
35 dB

Selectivity .

Signal to noise ratio , . . 46 dB
Power requirements
Power voltage tttttt 100,120,270, 240 V (50/60 HZ)

120V(Usable'll0~'l30V)

60 H1 (for USA. and Canada only)
Power consumption

Rated consumption a 90 watts no VA
Dimensions ........ 433 mm (17-l/16") w
, 153 mm (6-1/l6)H
354 mm (14") D
Weight ........... 7.5 kg (15.5 lbs) net
8.9 kg (19s lbs) packed

SWL * Eeslgn and specifications subject to change without notice 4
SANSUI ELECTRIC CO., LTD.

to be continued

Page 2

G 4500/4101

SPECIFICATIONS
G~4500l401

Audio section
Power output
Mln. RMS, both channels driven, from 20 to 20,000 H1, with no
more than 0.1% total harmonic dislorllon.
40 watts per channel into 5 ohms
Load impedance 3 ohms
Total harmonic dislonion
.............. less than 0.1% at or below raterl min.
RMS power output
lntetmodulation diswrllon (70 Hz : 7 kHz = 4:15MPTE method)
.............. less than one
Frequcncy response (at 1 wait)
.. 10 to 50,000 Hz +1 as ~2ae
RIAA curve deviation PHONO)
.............. +0.5 08 -o.s as (30 to 15,000 Hz)
Damping factor ...... approximately 30 at eonm
load
input sensitivity and impedance (| kHsz rated power output)
PHONO 2.5 mv/n kilohms
(Max. inputcapah ty;200 mv at l kHz, less titan 0.5%lotal
harmonic distortion)
AUX, TAPE .
Mlc . .
output leve 1 it
TAPE REC (pin jack] . 150 mv/47 kilohms
Channel separation [I erz, at rated poweroutput)

. 150 Ml kllohms
. a rnvllo kiloltnts

Hunt and noise (shattcitc A network)

PHONO .......

AUX . r e e ...... 95 dB

Controls
BASS . ,,,,,, :10 dB (50 H2)
TREBLE . . em .1300 kHz)

LOUDNESS 1-30 is) i 7 as at 50 H1

5 dB 10 kHl

FM section
Tuningrangc . .
Usable sensitivity

Mono IHF , . .

. sate 103MHz

. . 11.0 dBf(l.95uV)
. 1.1uv

DIN . .
Stereo IHF . . . 19.0 out
so dB Quietlng sensi vity
Mono .. . .. lsoer
stereo . . .. as dBf
Signal to noise ratio [at 65 £157)
Mono . . 71 dB
Sieuu , e . . . 68 dB

Distortion (at 5
Mo no

less than 0.1 8% at 100 Hz
less than 0.l5% at 1,000 H1
less than 0.15% at 6,000 H1
less than 0.3% at 100 H:
less than 0.25% at 1.000 H1

Capture ratio . r .
Image response ratio ,
Spurious response ratio
5!!! separation .

Frequency response . . .
Anunna input impedance

AM section
Tunln range .......

Usaole sensitivity (Bar antenna)

v

Signai to noise ratio .

Power requirements
Power voltage ......

Power consumption

Rated consumption .

Dimensions ........

Weight ...........

. L303

. 4305(at98 Ml-lx)
. 7003(a198 MHz)
.3odaat100Hz

40 68 1.000 H2
23 on at io,0oo Hz
30 w15,000 190.5 dB -l.0 dB,

300 ohms balanced
75 ohms unbalanced

53D 10 LEGO kHz

50 dBIm (300 pV/m)

. 35 dB
. 46M!

loo, 120, 210, 240 v (SD/60 H1)
120 V (Usable 110 ~13o v)
60 Hz [for USA. and Canada only)

lls walt5145 VA

433 mm (17~1I16")W
153 mm (6-1/16") H
354 mm (14") D

an kg (.9 lbs) net
9.5 kg (20.9 lbs) packed

less than 0.3% at 6,000 H1
Alternate channel selectivity (at 400 kHz)
. . . . , so on

PHOND . . . . better than 50 dB

AUX bettenmn 50 dB ' Design and specifications suhiect to change without notice

for improvements.

1. OPERATIONS

Pop-noise preventive circuit
In order to prevent the annoying pop-noise to the loudspeakers at
turning the power of the amplifier ON, the pop-noise preventive cir-
cuit adopted in the 6-4500/401 is the combination of the conven-
tional driver-voltage delay type used in the power supply (rectifier)
circuit and the NF delay type pop-noise preventive circuits. The
configuration of NF delay type pop-noise preventive circuit is
shown in Fig. 1.
In this circuit, the switching (ON-OFF) of the transistor TROS is
made by the time constant of the capacitor 010 and resistor R88.
. Thereby the NF resistor, R51 is controlled, and the gain of the main
amplifier stage is lowered when TRDS is ON, thus the voltage drift
(transient voltage) of the main amplifier at turning the power ON
does not appear on the speaker terminals for very short period of
time. In other words, at the instant that the power is turned ON,
the voltage at the point A rises up to +13V, then the voltage de-
creases by means of the time constant of C40 and R88 as shown in
1 Fig. 2. At this time, the diode D11 is inversely biased, consequently,
the potential voltage of the point B is 0V as Fig. 3. Because of this,
TROS turns to the cut-off, thus the NF resistor, R51 acquires such a
I state as its resistance value becomes equivalently very large, which
decreases the gain of the power amplifier. When the charge of the
C40 is completed, the voltage of the point B (see Fig. 3) becomes
negative, as a result, the diode D11 is biased. Therefore, TROS is
turned 0N, and the circuit of this equipment is normally operated
l approximately 2 seconds after the power is turned ON to prevent
l, . the popanoise which flows to loudspeakers. '

6 -2V

0

Time» r

VOLTAGE-> +13v

r
E->From this point, the set begins
é__ 2 SECONdS -_>} working normally.

Power 0N

Fig. 2 Voltage variation during a certain period

of time at ®

Time-9

V0 LTAG E ->
O

-0.72V -%

r
<- 2seconds --1
r

Voltage variation at

Fig. 1 Fig. 3

to speaker terminals