Sansui CA 3000 Service Manual

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SERVICE MANUAL

PREAMPLIFIER
SANSUI til-3000

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 CA-3000 correctly.

When ordering the parts, use the stock number and parts name specific-
ally referring to the Parts Locations & 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 .............................................. 2
3 ADJUSTMENTS ................................................ 3

3-1. Regulated Power Supply Adjustment .......................... 3

3-2. Level Meter Adjustments ...................................... 3

4. TROUBLESHOOTING CHART .................................... 4
4-1. Operation Block Diagram .................................... 4
4-2. Troubleshooting on Each Section .............................. 5

5. PARTS LOCATIONS AND PARTS LISTS ........................ 6
5-1. F-2493 Power Supply Circuit Board ............................ 6

5-2. F-2494 Regulated Power Supply Circuit Board (High Voltage) . . . . 7
F-2494 Regulated Power Supply Circuit Board (Low Voltage) . . . . 7

5-3. F-2486 Equalizer Circuit Board ................................ 8
5-4. F-2491 Headphone Amplifier Circuit Board .................... 8
5-5. F-2487 Volume & Muting Circuit Board ........................ 9
5-6. F-2495 Tone Amplifier Circuit Board .......................... 9

5-7. F-2488 Tone Control Circuit Board .......................... 10

5- 8. F-2489 Input Capacitance Circuit Board ...................... 10

5- 9. F-2492 Meter Circuit Board .................................. 11
5-10. F-249O High-Low Filter Circuit Board .......................... 12

5- 11. F-2484 Meter Lamp Circuit Board ............................ 12
5-12. F-2485 Input Circuit Board .................... .............. 13
5-13. Figures .................................................... 14

5- 14. Other Parts ................................................ 15

5- 15. Other Parts (Front Side) ...................................... 16

6. SCHEMATIC DIAGRAM (No.1) ................................ 18
6-1. Connection Diagram ........................................ 17
6-2. Input Circuit Board .......................................... 17
(No. 2) ................................ 18

7. PACKING LIST ................................................ 19
8. ACCESSORY PARTS LIST ...................................... 19