Sansui AU 4400 Service Manual

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This service manual is designed for service engineers to repair, adjust,
maintain and order the replacement parts of the AU-44OO correctly.
When ordering the parts, use the stock number and parts name speci-

fically referring to the Parts Locations 8: Parts Lists.
For general usage and maintenance of the unit, please refer to the

Operating Instructions attached with the unit.

TABLE OF CONTENTS

Section Title Page
1. SPECIFICATIONS ................................................ 2
2. BLOCK DIAGRAM AND VALUE OF EACH LEVEL ................ 3
3. ADJUSTMENT .................................................. 4
4. TROUBLESHOOTING CHART .................................... 4

4-1. Troubleshooting on Power Supply Section ...................... 4
4-2. Troubleshooting on Audio Section ............................ 4
5. PARTS LOCATIONS AND PARTS LISTS ........................ 5
5-1. F-2400A Equalizer, Tone Control Circuit Board .................. 5
5-2. F-2402 Main 8: Power Supply Circuit Board .................... 5
5-3. F-2406 Selector Switch Circuit Board .......................... 6
5-4. F-2407 Volume Circuit Board .................................. 6
5-5. F-2408A Accessory Circuit Board .............................. 6
5- 6. Other Parts (Front Side) ...................................... 7
-5- 7. Other Parts (Top Side) ........................................ 8
6. SCHEMATIC DIAGRAM .......................................... 9
'7. PACKING LIST ................................................ 10
8. ACCESSORY PARTS LIST ...................................... 10

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1. SPECIFICATIONS

CONTINUOUS RMS POWER OUTPUT OTHERS
................ 20 Watts per channel x 2 SEMICONDUCTORS
(both channels driven) TRANSISTOR .......... 17
LOAD IMPEDANCE ...... an DIODES .............. 4
POWER BAND .......... 40 to 20,000Hz ICS .................... 4
TOTAL HARMONIC DISTORTION LED .................. 1
................ less than 0.3% POWER REQUIREMENTS
(from AUX inputs) VOLTAGE ............ 100,117, 220,240v 50/60Hz
Music PM" UHF) -------------- 33mg 1.33333 CONSUMPTION ...... 56W (rated), 156W (max.)
' DIMENSIONS ............ 400mm (153/4) w

Continuous RMS power output. .23+23W (80 1,000Hz)
INTERMODULATION DISTORTION 120mm (4%) H

(at rated power output, 70Hz: 7kHz=4 : 1 SMPTE 240mm (9%) D
method) WEIGHT ................ 6.3Kg (13.9 lbs) net

OVERALL (from AUX) . .less than 0.5% 7.6Kg (16.8 lbs) packed
FREQUENCY RESPONSE (at 1 Watt power output)

OVERALL (from AUX) . .20 to 30,000Hz :IdB
EQUALIZATION (at TAPE REC output)

................ RIAA Curve
(3OHz~15kHz i1dB)
DAMPING FACTOR ...... 50 (8.0.)
CHANNEL SEPARATION (1kHz at rated power output)
PHONO .............. better than 45dB

TUNER, AUX, TAPE . . . .better than 45dB

IHF HUM AND NOISE
PHONO .............. better than 70dB

MIC .................. better than 70dB

TUNER, AUX, TAPE .. . .better than 85dB
INPUT SENSITIVITY AND IMPEDANCE (1kHz for rated

power output)

PHONO .............. 2.5mV 50k!)
(Max. input capability: 100mV at 0.2% distortion)
MIC .................. 2.5mV 10k!)
TUNER, AUX .......... 150mV 50km

TAPE RLAY (Pin jack) ..150mV 50km
TAPE REC/PLAY (DIN socket)
................ 150mV 50k!)
RECORDING OUTPUT
TAPE REC (Pin jack) ... .150mV
TAPE REC/PLAY (DIN socket) . .30mV

SWITCHES AND CONTROLS
BASS .................. +12dB, -12dB (50Hz)

TREBLE ................ +12dB, -12dB (15kHz)
LOUDNESS (volume control: -30dB)
......... . . . . . . . +10dB (50Hz)
+8dB (10kHz)

LOW FILTER .......... -3dB (100Hz, 6dB/oct.) , ,
HIGH FILTER .......... -3dB (7kHZ, 6 d B / 0 Ct.) Pnezlgrlleamngnteciflcatlon subject to change without notice for