Sansui AU 20000 Service Manual

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SERVICE MANUAL

INTEGRATED STEREO AMPLIFIER

SANSIII 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 ................................ 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 .................................... 1 1
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 ........................................................ 15
5-1. Semiconductors .................. . ........................... 15
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 .......................................... 17
7-2. Power Amplifier Section ...................................... 18
8. PACKING LIST .................................................. 19
9. ACCESSORY PARTS LIST ........................................ 19