Sansui AU 8500 Service Manual

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SERVICE MANUAL

STEREO AMPLIFIER
SANSUI All-8500

SANSUI ELECTRIC CO., LTD.

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Au-ssoo

This service manual is designed for service engineers to repair,
adjust, maintain and order the replacement parts of the AU-8500
correctly.

When ordering the parts, use the stock number and parts name speci-
fically referring to the Parts Locations & Parts List.

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 LEVEL DIAGRAM .. 3

2-1. Block Diagram ............................................ 3
2-2. level Diagram ............................................ 4
3. ADJUSTMENTS ................................................ 5
3-1. Driver Circuit Board Adjustment .......................... 5
4. TROUBLESHOOTING CHART .................................. 6
4-1. Troubleshooting on Power Supply Section .................. 6
4-2. Troubleshooting on Protector Section ...................... 6
4-3. Troubleshooting on Audio Section ........................ 6, 7
5. PARTS LOCATIONS AND PARTS LIST ........................ 8
5-1. F-2006A Equalizer Circuit Board .......................... 8. 9
5-2. F-2049A Switch Circuit Board ............................ 9, 10
5-3. F~2017 Adjusting Volume Circuit Board .................... 10
5-4. F-2019C Tone Control Circuit Board .................... 11, 12
5-5. F-2020 Tone Switch Circuit Board .......................... 13
5-6. F-2037-1 Choke Transformer Circuit Board .................. 14
5-7. F-2016C Filter Circuit Board ................................ 14
5-8. F-2029B Driver Circuit Board ............................ 15, 16
5-9. F-2050A Transistor Socket Circuit Board .................... 16
5-10. F-2030-1 Power & Protector Circuit Board .............. 17, 18
5-11. F-2076 Rectifier Circuit Board .............................. 18
5-12. Other Parts (Front Side) ................................ 19, 20
5-13. Other Parts (Top Side) .................................... 21
5-14. Other Parts ((Bottom Side) ................................ 21
6. SCHEMATIC DIAGRAM ........................................ 22
7. PACKING LIST ................................................ 23
8. ACCESSORY PARTS LIST .................................... 23
9. MAINTENANCE .............................................. 23

9-1. Voltage Adjustment ........................................ 23