Sansui AU 2900 Service Manual

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SERVICE MANUAL

INTEGRATED STEREO AMPLIFIER
SANSIJI All-2900

SANSUI ELECTRIC CO., LTD. K

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1. SPECIFICATIONS

POWER OUTPUT
Min. RMS, both channels driven, from 40 to 20,000Hz,
with no more than 0.3% total harmonic distortion
'15 watts per channel into 8 oh ms
Min. RMS, both channels driven, at 1,ooon,

with no more than 0.3% total harmonic distortion
17 watts per channel into 8 ohms

LOAD IMPEDANCE ........ 8 ohms (SYSTEM-A or B)
POWER BANDWIDTH ...... 40 t0 20,000Hz at or below
rated min. RMS power
output and total harmonic
\ distortion
TOTAL HARMONIC DISTORTION
.................... less than 0.3% at or below
rated min, RMS power out~
put
INTERMODULATION DISTORTION
(70Hz : 7kHz=421 SMPTE method)
...................... less than 0.5%
FREQUENCY RESPONSE (at 1 Watt)
...................... 10 to 40,000Hz :23: dB
RIAA CURVE DEVIATION (PHONO)
...................... +0.5dB, -O.5dB (30Hz to
15kHz)
DAMPING FACTOR ........ |appcgoximately 30 at 8 ohms
0a
INPUT SENSITIVITY AND IMPEDANCE

(1 kHz, for rated power output)

PHONO ................ 2.5mV/50 kiloohms »
(Max. input capability: 170mV at 1kHz, less than
0.5% total harmonic distortion)

TUNER ,,,,,,,,,,,,,,,,, 130mV/50 kiloohms

AUX .................... 130mV/50 kiloohms

TAPE PLAY (pin jacks) ....130mV/50 kiloohms

OUTPUT LEVEL (1,000HZ)
TAPE REC (pin jacks) ....100 mV
CHANNEL SEPARATION (1 kHz, at rated power output)

PHONO ................ better than 57dB

TUNER .................. better than 60dB

AUX .................... better than 60dB

TAPE PLAY .............. better than 60dB
HUM AND NOISE (IHF)

PHONO tttttttttttttttt better than 75dB

TUNER .................. better than 90dB

AUX ....... better than 90dB

TAPE PLAY .............. better than 90dB
CONTROLS

BASS .. ..+12ClB, *12dB(50HZ)

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

HIGH FILTER ............ 73dB (7 kHz, 6dB/octi)
POWER REQUIREMENTS
POWER VOLTAGE ........ 100, 120, 220, 240V SO/EOHZ

12OV(Usable 110N130V)60Hz
(for USA. & Canada only)
POWER CONSUMPTION. .50 watts (rated)
110 watts, 125 VA (max),

DIMENSIONS tttttttttttttt 400mm (15%)W

120 mm (4%) H

240 mm (9 M) D
WEIGHT .................. 5.7 kg (12.6 lbs) net

6.7 kg (14.8 lbs) packed

* Design and specifications subject to change without notice for
Improvements.

TABLE OF CONTENTS

Section Title Page
1. SPECIFICATIONS .................................................. 1
2. ADJUSTMENTS . 2

2-1. Bias Current Adjustment ........................................ 2
OTHER PARTS (Front & Back Side) .............................. 3

3.
0 COMMON PARTS LIST FOR RESISTORS

& CAPACITORS ONLY .........
4. PARTS LOCATION AND PARTS LISTS

4-1. F-2555 Tone Control Circuit Board .............................. 4

4-2. F~2554 Driver Circuit Board

4-3. F-2556 Switch Circuit Board
4-4. F-2587 Connector Circuit Board

4-5. Figures .......................... .. 4
5. SCHEMATIC DIAGRAM ............................................ 5
6. OPERATION BLOCK DIAGRAM .................................... 6
7. TROUBLESHOOTING .............................................. 6
8. PACKING LIST .......................................... BACK COVER
9. ACCESSORY PARTS LIST ................................ BACK COVER