Sansui AU 2000 Service Manual

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SERVICE MANUAL

INTEGRATED STEREO AMPLIFIER

SANSUI All-20000

SANSUI ELECTRIC CO., LTD.

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This service manual is designed for service engineers to repair, adjust,
maintain and order the replacement parts of the AU-ZOOOO correctly.
When ordering the parts, use the stock number and parts name speci-
fically referring to the Parts Location and 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. ADJUSTMENTS .................................................. 3

2-1. Driver Circuit Board Adjustment ................................ 3
2-2. Power Meter Adjustment ........ . 3
3. TROUBLESHOOTING .......... .. 4
3-1, Troubleshooting Chart ...................................... 4, 5
4. PARTS LOCATION AND PARTS LIST ............................ 6
4-1. F-2500 Input Circuit Board .......... . 6
4-2. F-2503 Tape Copy Circuit Board 4 6
4-3. F-2501 Equalizer Circuit Board .................................. 7
4-4. F-2502 Main Volume Circuit Board .............................. 8
4-5. F-2505 Flat Amplifier Circuit Board .. . 8
4-6. F-2488 Tone Control Circuit Board .. . 9
4-7. F-2495 Tone Amplifier Circuit Board ............................ 9
4-8. F-2496 Meter Circuit Board .................................... 10
4-9. F-2504 Filter Circuit Board ... 10
4-10. F-2507 Driver Circuit Board ..... ... 11
4-11. F-2511 Protector Circuit Board ................................ 12
4-12. F-2498 Filter Amplifier Circuit Board ............................ 12
4-13. F-2508 Regulated Power Supply Circuit Board 13
4-14. F-2510 Connector Circuit Board ................ ... 13
4-15, F-2512 Connector Circuit Board ................................ 13
4-16. F-2497 Circuit Board for Installing Emitter Resistor .............. 14
4-17. F-2484 Meter Lamp Circuit Board ................ ... 14
5. FIGURES ........................... . . .
51. Semiconductors ......
5-2. Connector & Pin Assy ........................................ 15
5-3. Power Supply Voltage changeover. . . 15
6. OTHER PARTS ..................... 16
6-1. Parts List (Front Side) ............................. 16
6-2. Other Parts List ............................... 16
7. SCHEMATIC DIAGRAM .. 17
7-1. Pre Amplifier Section. . ..
7-2. Power Amplifier Section ..
8. PACKING LIST ............
9. ACCESSORY PARTS LIST ........................................ 19

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1. SPECIFICATIONS

POWER OUTPUT

Min. RMS, both channels driven, from 20 to 20,000Hz,

with no more than 0.05% total harmonic distortion
170 watts per channel into 8 ohms
I 170 watts per channel into 4 ohms

85 watts per channel into 160th
Ml" RMS, both Channels driven. at LDWHI, with no
more than I) 05% total harmonic distortion

130 wins per channel im 3 ohms

170 watts per (tunnel min a ohms

LOAD IMPEDANCE ........ 4, 8, 16 ohms (SYSTEM A
or B)
8,16 ohms (SYSTEM A+ B)

rated min. RMS power

output and total harmonic

distortion
TOTAL HARMONIC DISTORTION

...................... less than 0.05% at or below

rated min. RMS power
output
INTERMODULATION DISTORTION
(70Hz:7kHz=4:1 SMPTE method)
...................... less than 0.05%
FREQUENCY RESPONSE (at 1 watt)
. . ...................... 10 to 50,000HZ :ldB

DAMPING FACTOR ........ approximately 80 at 8 ohms

load
INPUT SENSITIVITY AND IMPEDANCE
(IkHz for rated power output)

PHONO-1 .............. 1.5, 3, 6 mv/3o, so, 100 kilo-
ohms
PHONO-Z .............. 1.5, 3. 6mV/50kiloohms

(Max. input capability: 800 mV at 1 kHz, less than
0.1% total harmonic distortion and SENSITIVITY

. . switch at 6 mV)
TUNER .................. 130 mV/SO kiloohms

AUX ................... 130 mV/SO kiloohms

TAPE-1, 2 PLAY (pin jacks)
...................... 130 mV/SOkiloohms

TAPE-2 REC/PLAY (DIN socket)

. .130 mV

MAIN IN ................ 700 mV/SOkilooth

BLOCK DIAGRAM

POWER BANDWIDTH ...... 20 to 20,000Hz at or below

OUTPUT LEVEL (1,000HZ)
TAPE-1, 2, 3 REC (pin jacks)

...................... 130 mV
TAPE-2 REC/PLAY (DIN socket)
...................... 30 mV
PRE OUT ................ 700 mV
CHANNEL SEPARATION (1 kHz, at rated power output)
PHONO-1, 2 ............ better than 55dB
TUNER .................. better than 60dB
AUX .................... better than 60dB
TAPE-1, 2, 3 PLAY . ...better than 60dB
MAIN IN ................ better than 65dB
HUM AND NOISE (IHF)
PHON0-1, 2 ............ better than 70dB
TUNER ...... ...better than 80dB
AUX ............. ...better than 80dB
TAPE-1, 2, 3 PLAY ........ better than 80dB
MAIN IN ................ better than 100dB
CONTROLS
BASS .................... :10dB (3OHZ)
MIDRANGE.. .iSdB(1kHZ)
TREBLE ...... .i10dB (20 kHZ)
LOW FILTER .. .-3dB(20,4OHz),12dB/oct.
HIGH FILTER ............ 73dB (7 kHz), 6dB/oct.
7 3dB (12 kHz), 12dB/oct.
MUTING ................ o, -10, -30dB
POWER REQUIREMENTS
POWER VOLTAGE ........ 100, 120, 220, 240V 50/60HZ

120V (Usable 110N130V)
(for USA & Canada only)
POWER CONSUMPTION. .360 watts (rated)

1,110 watts (max)
DEMENSIONS .............. 460 mm (18 W) w

178 mm ( 7%,) H

400 mm (15 %") D
WEIGHT .................. 23.6 kg (52.0 lbs) net

264 kg (58.2 lbs) packed

* Design and specifications subject to change without notice (or
improvements.

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