Sansui QRX 5500 Service Manual

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SERVICE MANUAL

4-CHANNEL RECEIVER

SANSUI ELECTRIC CO., LTD.

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QRX-5500

This service manual is designed for service engineers to repair,

adjust, maintain and order the replacement parts of the QRX-SSOO
correctly.
When ordering the parts, use the stock number and parts name speci-

fically referring to the Parts Locations 8: Parts List.
For general usage and maintenance of the unit, please refer to the
Operating Instructions attached with the unit.

TABLE OF CONTENTS

M M IE
1. SPECIFICATIONS ................................................ 2
2. BLOCK DIAGRAM AND LEVEL DIAGRAM ...................... 3

2-1. Block Diagram .......................................... 3, 4
2-2. Level Diagram ................. . 4
3. ALIGNMENTS AND ADJUSTMENTS . 5
3-1. Regulated Power Supply Board Adjustment .......... r 5
3-2. Level Meter Adjustment .................................... 5
3-3. Driver Circuit Board Adjustment ............................ 6
3-4 PM IF Alignment .............................. ... 7
3-5. FM Dial Calibration and RF Alignment .................... 7, 8
3-6. FM Signal Meter, Mono Distortion, Tune Meter and
Muting Adjustment .................................... 8
3 7. MPX Alignment ............................................ 9
3- 8. AM IF, Dial Calibration RF and Signal Meter Alignment . 9. 10
4. THREADING OF DIAL CORD ............................. .. 11
5. TROUBLESHOOTING CHART ........................... .. 11
5-1. Troubleshooting on Power Supply Section .................. 11
5-2. Troubleshooting on Audio Section .................. 11, 12, 13
5-3. Troubleshooting on RF Section ..... 13v 14, 15
6. PARTS LOCATIONS AND PARTS LIST .. ............... 16
6-1. F-1472A Equalizer Circuit Board ..................... 16
6-2. F-1487 Volume Circuit Board .............................. 16
6-3. F-1479A Tuner Circuit Board ........................ 17. 18, 19
6-4. F-1489 Mixing 8: Accessory Circuit Board. r
6-5. F-2048 Vario-Matrix Circuit Board ......
6-6. F-2047 Vario-Matrix Circuit Board ......
6-7. F-1485 Meter Circuit Board ............
6~8. F-1482 Driver Circuit Board ..................
6-9. F-1483 Protector & Power Circuit Board . I
6-10. F-1490 De-emphasis Circuit Board ........
6-11. F-1488 Connector Joint Circuit Board
6-12. F-1486 Filter Circuit Board ............
6-13. F-1484 Tone Control Circuit Board
6-14. Other Parts (Front Side) ..............
6- 15. Other Parts (Top Side) ..........
6- 16. Other Parts (Bottom Side) ..............
7. PACKING LIST ............................
8. ACCESSORY PARTS LIST ..................
9. REPLACEMENT OF MAIN PARTS ..........
9-1. Dial Lamp .............................................. 35
9-2. How to Install the Knob of DIRECTION Switch . ........... 35
10. SCHEMATIC DIAGRAM OF TUNER SECTION ... ........... 36
11. SCHEMATIC DIAGRAM 0F AUDIO SECTION H ............. 37
12. MAINTENANCE ........................................... 38

12-1 Voltage Adjustment ...................................... 38