Sansui QRX 7001 Service Manual

Page 1

bCHAIML STBEO

SERVICE MANUAL

4-CHANNEL RECEIVER
SANSlll HEX-7001

Stun-u}.
SANSUI ELECTRIC CO., LTD.

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Sunni QRX-7001

TABLE OF CONTENTS

Section

1.
2.
3.

1"

Thls sen/ice manual is designed for service engineers to repair, adjust,
maintain and order the replacement parts of the QRX-7001 correctly.
When ordering the parts, use the stock number and parts name specific-
ally referring to the Parts Locations & Parts Lists.

For gederal usage and maintenance of the unit, please refer to the
Operating Instructions attached with the unit.

Title
SPECIFICATIONS . ..

BLOCK DIAGRAM ...................... 4
ALIGNMENTS AND ADJUSTMENTS . .5
3-1. Driver Circuit Board Adjustment .... 5, 6
3-2. FM IF Alignment ...................... .6
3-3. FM Dial Calibration and RF Alignment ........ 7
3-4. FM Signal Meter, Mono Distortion and

Muting Adiustmenj ........................ 7. 8

3-5. MPX Alignment . ......................... 8
3-6. AM IF, Dial Calibration, RF and Signal Meter
Alignment ............................... 9. 10

THREADING OF DIAL. CORD ....... ...11

. TROUBLESHOOTING ICHART ................ 12

5-I. Troubleshooting on Power Supply Section. . ..12

5-2. Troubleshooting on Main Circuit Section .. . .12
5-3. Troubleshooting on Tone Control Circuit

Section .................................... 12

54. Troubleshooting on Phone Circuit Section. .12
5-5 Troubleshooting om Tuner Circuit Section. .13

. PARTS LOCATION AND PARTS LIST ........ 14

6-1 F-1519C FM Frontend Pack .................. 14
6-2. F-1507C Tuner Cirquit Board ... ..15. 15
6-3. F-2458 Equalizer Circuit Board ..... .....17
6-4. F-2425 Tone Control Circuit Board .......... 17

Section

Title Page
6-5. F-2431 Power Supply Circuit Board for
Tuner Section ......................... . .17

6-6. F-2436A Driver Circuit Board ............... 18
6-7. F-2090 CD-4 Sub Channel Circuit Board ..19, 20
6-8. F-2086 CD-4 Main Circuit Board .....
6-9. F2087 QS Matrix Circuit Board .......
6-10. F-2088 QS Phase Control Circuit Board .
6-11. F-1461A Protector Circuit Board .......
6-12. F-2427 Power Circuit Board ........... . .
6-13. F-2426 Filter & Power Supply Circuit Board ..23
6-14. F-2423 Filter & Switch Circuit Board ........ 23
6-15. Interchangeability of Transistor and Diode ..24

6-16. Other Parts (Top Side) ...................... 24
6-17. Other Parts (Bottom Side) .................. 24
6-18. Other Parts (Front Side) Section 1 . .. ..25
6-19. Other Parts (Front Side) Section 2 .......... 26

7. SCHEMATIC DIAGRAM 0F
- TUNER SECTION ............................ 27

8. SCHEMATIC DIAGRAM OF
AUDIO SECTION ........................... 28
9. SCHEMATIC DIAGRAM OF 4-CH SECTION ..29

10. SCHENATIC DIAGRAM OF POWER SUPPLY

SECTION ...................................... 30
11. PACKING LIST .............. ,.back cover
12. ACCESSORY PARTS LIST ......... . back cover