Sansui QRX 8001 Service Manual

Page 2

TABLE OF CONTENTS
Section M IE

1. SPECIFICATIONS .. ..1, 2

2. BLOCK DIAGRAM .. 3
2- 1, QRX-8001 ... i. a
2- 2. QRX-9001 .............. 3, 4
3. OPERATION OF FM DOLBY SYSTEM. . 5
4. ADJUSTMENTS ,. G
4- 1 Audio Section ..6 7
4- 2. Tuner Section .............. 7 8,9,10,11
4- 3 Dolby Circuit Adjustment (QRX- ~9001 Only)
.................................. 11, 12
5. PARTS LOCATION & PARTS LISTS .. . 13
5- i. F-2636 Volume & Filter Circuit Board ...... 13
5- 2. F-2634 4-ch Function Switch & REC
CAL Ton Circuit Board .................... 13
5- 3. F-2638 Power Supply Circuit Board ........ 14
5- 4. F-2637 Tone Control Circuit Board . 14
5- 5. F-2639 Ere-Power Supply Circuit Board .. .. 14
5- 6. F-2614 Tuner Circuit Board ................ 14
5- 7. F-26IS Tuner Sub Circuit Board 14
5- 8. F-2590 Tuner Circuit Board ... 15
5- 9. F-2624 Driver Circuit Board. 15
5-10 F-2632 Selector Circuit Board . 15
5»1L F-ZMZ indicator Circuit Board 15
5-12 F-2087 QS Matrix Circuit Board .. 16
543 F-2088 QS Phase Discriminator Section
Circuit Board ............................ 16
5-14. F2689 Protector Circuit Board . . .. 16
5-15. F-2589 Equalizer & CD-4 Circuit Board .... 17
5-16. F-2688 Dolby Circuit Board ............ 17
5-17. F2640 Illumination Circuit Board (1) 17
5-18. F-2641 Illumination Circuit Board (2) 17
5-19. F-2635 4-ch Function Switch & REC
CAL Tone Sub Circuit Board rrrrrrrrrrrrrr 17
5-20. F-Z633 Dolby Change Circuit Board ........ 18
5-21. F-2686 4-ch Function Switch & REC
CAL Tone Sub Circuit Board .............. 18
5-22. F 2652 Dolby Sub Circuit Board 18
5-23 Figures . 18
6. OTHER PARTS .
6- 1. QRX- 8001.
6- 2. QRX 9001
6- 3 Exploded View (QRX 8001/9001) .......... 20

7. SCHEMATIC DIAGRAM .......
7- 14 QRX-8001 Tuner Section .
7- 2. QRX-8001 Audio Section .
7- 3. QRX- 9001 Tuner Section .
7- 4 QRX- -9001 Audio Section .
7- 5 QRX- 8001 9001 4- Channel Section
8. THREADING OF DIAL CORD
8- 1 Threading of Dial Cord
8- 2 Attachment of Dial Pointer. .
9. PACKING LIST .................... BACK COVER
10. ACCESSORY PARTS LIST .......... BACK COVER

1. SPECIFICATIONS

AUDIO SECTION
POWER OUTPUT
Min. RMS. four channels driven, from 20 to 20,000Hz, With
no more than 0.3% total harmonicdistortion
40 watts per channel into 8 ohms
40 Watts per channel into 4 ohms
Min RMS four channels driven at 1,000Hz with no
more than 0.3% total harmonic distortion
43 watts per channel into 8 ohms
43 watts per channel Into 4 ohms
Min. RMS. both channels driven from 20 to 20,000Hz, with
no more than 0.3% total harmonic distortion and SPEAK-
ERS/MODE switch at 2-01 A (POWER ;\ 2)
100 watts per channel into 8 ohms

Min RMS both channels driven at LOOOHZ with no
more than 0.3% total harmonic distortion and
SPEAKERS MODE Swltch at 2-CH A (POWER 2)
110 watts per channel into 8 ohms

POWER OUTPUT
Min. RMS. four channels driven, from 20 to 20,000Hz, With
no more than 0.3% total harmonic distortion
60 watts per channel into 5 ohms
60 watts per channel into 4 ohms
Min RMS four channels driven at 1,000Hz With no
more than 0.3% total harmonic distortion
65 watts per channel into 5 ohms
65 watts per channel into 4 ohms
Min. RMS both Channels driven, from 20 to 20,000Hz, with
no more than 0.3% total harmonic distortion and SPEAK-
ERS/MODE swtth-I at 2-CH A (POWER x 2)
120 watts per channel into 8 ohms
Min RMS both channels driven at 1130qu with no
more than 0.3% total harmonic distortion and
SPEAKERS MODE Switch at zrcn A (POWER , 2)
140 watts per channel into 8 ohms

LOAD IMPEDANCE
SPEAKERS/MODE Switch at 2'CH7A, 4-CH7A and 4-CHiB

...................... 4 and 8 ohms
SPEAKERS/MODE SWItch at 2-CH» A(POWER x 2) and 4-CH7~
A+B .................... 8 ohms
POWER BANDWIDTH ........ 20 to 20,000Hz at or below

rated min. RMS power output
and total harmonic distortion
TOTAL HARMONIC DISTORTION
...................... less than 0.3% at or below
rated min. RMS power output
INTERMODULATION DISTORTION (7OHZ: 7kHZ 4:1 SMPTE
method) .................. less than 0.3%
FREQUENCY RESPONSE (at 1 watt)
...................... 20 to 30 OOOHZ i1dB
RIAA CURVE DEVIATION (PHONO)
'1'1iOdB, 71.0113 (30Hz to 15kHZ)
DAMPING FACTOR .......... approximately 30 at 8-ohm load
INPUT SENSITIVITY AND IMPEDANCE
(1kHz, for rated power output)
PHONO (Z-channel) ...... 2.5mV,"50 kilohms
(Max. input capability: 150mv at ikHz, less than 0.3%
total harmonic distortion)
TAPE PLAY (pin iacks) 100mV/50 kilohms
TAPE 1 REC/PLAY (DIN Socket)
............... 100mV/50 kilohms

AUX . 100mV/50 kilohms

MIC. , ., ............... 4mv,io kilohms
RECORDING OUTPUT

TAPE REC (pin jacks) ...... 100mV

TAPE-1 REC/PLAY (DIN socket)

...................... 30mV
CHANNEL SEPARATION (at rated output1kHZ)
PHONO ................ better than 45dB
TAPE PLAY, AUX ., ...... better than 45dB
HUM AND NOISE
PHONO ................. better than 70dB
TAPE PLAY, AUX ......... better than 30dB