Sherwood RX-772 Bedienungsanleitung

RX-772

STEREO RECEIVER

- SPECIFICATION - TROUBLESHOOTING

- BLOCK DIAGRAM - MECHANICAL PARTS LIST

- WIRING DIAGRAM - EXPLODED VIEW

- LEVEL DIAGRAM - ELECTRICAL PARTS LIST

- CIRCUIT DESCRIPTION - SCHEMATIC DIAGRAMS

- TUNER ALIGNMENT

◑

CONTENTS

◑

SERVICE MANUAL

Measuring methods are based on IHF and IEC standard 268-3

Measurements conditions, unless otherwise noted :

Output resistive load = (8) ohms / Both channel driven

Tone(Bass, Treble), Balance, EQ control : Center Position , Other SW's : OFF

Nominal input level : 5mV for MM, 0.5mV for MC, 220mV for general purpose inputs

Power figures should be kept minimum 10min. between 15 and 35 ℃

Terminator : 100ohm for MC, 1kohm for MM and general purpose inputs

Filter : IHF-A filter R/O = Rated Output

Power supply : 230V / 50Hz(RDS), 220V / 60Hz(K)

●

FRONT AMP SECTION ( 2-CH STEREO RECEIVER )

DESCRIPTION INPUT FREQ. REMARK UNIT NOMINAL L/R LIMIT L/R

INPUT SENSITIVITY EXT 1kHz mV 200±30 200±50

@ 1kHz , 47kΩ(RDS) MIC 1kHz mV - -

(K) MIC 1kHz mV 3±0.5 3±1

CHANNEL BALANCE EXT 1kHz R/O TO -40dB dB ±0.5 ±2

RESIDUAL NOISE, IHF-A FILTER 1kHz VOL min. ≤0.2 ≤0.5

AT INPUT SHORTED 1kHz VOL max. mV ≤1.5 ≤2

TOTAL HARMONIC DISTORTION 20Hz % ≤0.02 ≤0.08

1kHz % ≤0.02 ≤0.08

20kHz % ≤0.05 ≤0.1

CONTINUOUS AVERAGE POWER 20Hz W 103 100

at (0.08)% THD 1kHz W 103 100

20kHz W 103 100

S/N RATIO, IHF-A FILTER EXT 1kHz R/O dB ≥95 ≥92

CHANNEL SEPARATION 1kHz dB ≥65 ≥55

AT INPUT SHORTED 10kHz dB ≥45 ≥40

FUNCTION CROSSTALK AUX→CD 1 kHz dB 75 70

AT INPUT SHORTED CD→AUX 1 kHz dB 75 70

FREQUENCY RESPONSE (-3dB)

1kHz Ref

15~90Hz~kHzEXT 10~100

R/O

EXT

R/O TO -3dB

EXT 8ohms

EXT

SPECIFICATION

No.

DESCRIPTION INPUT FREQ. REMARK UNIT NOMINAL L/R LIMIT L/R

TONE CONTROL 100Hz dB ±10±1 ±10±3

10kHz dB ±10±1 ±10±3

IDLE CURRENT

NO INPUT LATER 10 MINUTE (RDS) INPUT SHORT mV 4.5±1 4.5±1.5

(K) INPUT SHORT mV 4.5±0.5 4.5±1

REC OUTPUT TAPE,VIDEO (RDS) 200±30 200±50

(K) 200±20 200±30

HEADPHONE OUTPUT

H/P = 64ohms

●PHONO SECTION

DESCRIPTION INPUT FREQ. REMARK UNIT NOMINAL L/R LIMIT L/R

INPUT SENSITIVITY PHONO 1kHz 150mVrms(REC OUT) mV 2.7±0.3 2.7±0.5

S/N RATIO INPUT SHORT

HF-A FILTER

RIAA DEVIATION (VOL MIN) 20Hz ~ dB ≤19.2±0.3 ≤19.2±1

20kHz dB ≤-19.6±0.3 ≤-19.6±1

MAX INPUT VOL MIN THD 0.1% PHONO 1kHz REC OUT ㎷rms ≥120 ≥100

THD IHF-A FILTER PHONO 1kHz 3Vrms(REC OUT) %≤0.002 ≤0.01

1kHzPHONO

REC OUTPHONO

≥75

80dB

150mVrms(REC OUT)

V 3±0.53±0.3

EXT 1kHz R/O

1 kHz

VOL MIN

EXT 1W

No.

Measuring methods in confirmity with IEC standard 315

Measurements condition FM : Radio frequency = 98.0MHz(RDS), 98.1MHz(K)

Audio frequency = 1kHz Reference level = 1mV on ( 75ohms ) Filter = B.P.F at STEREO

Deviation : MONO = ±75kHz, Stereo = ±67.5kHz±7.5kHz

Test Point : TP 1 = 90.0MHz, TP 2 = 98.0MHz, TP 3 = 106.0MHz(RDS)

Test Point : TP 1 = 90.1MHz, TP 2 = 98.1MHz, TP 3 = 106.1MHz(K)

Power supply : 230V / 50Hz(RDS), 220V / 60Hz(K)

●FM SECTION

No. UNIT NOMINAL L/R LIMIT L/R

1 TUNING RANGE LOW ~ HIGH MHz

STEP(RDS) AUTO/Man. kHz

(K) AUTO/Man. kHz

2 USABLE SENSITIVITY TP 1 dBµV ≤5≤12

S/N = 30dB TP 2 dBµV ≤5≤12

TP 3 dBµV ≤5≤12

3 AUTO STOP LEVEL dBµV 20±3 20+14/-10

4 S/N RATIO @1mV MONO dB ≥70 ≥65

IHF-A FILTER STEREO dB ≥65 ≥60

5 TOTAL HARMONIC DISTORTION MONO % ≤0.5 ≤1

STEREO % ≤0.8 ≤2

6 50dB QUIETING SENS. MONO dBµV ≤15 ≤25

STEREO dBµV ≤35 ≤45

7 CHANNEL SEPARATION 100Hz dB ≥35 ≥30

1kHz dB ≥35 ≥30

10kHz dB ≥30 ≥25

8 FREQUENCY RESPONSE AT ±3dB

1kHz=0dB 50㎲(RDS), 75㎲(K)

9 SPURIOUS RESPONSE dB ≥76 ≥60

10 IF REJECTION TP 1 dB ≥80 ≥70

11 IMAGE REJECTION TP 3 dB ≥46 ≥30

12 AM REJECTION RATIO AT AM 30% dB ≥60 ≥55

13 OUPUT LEVEL MONO TAPE REC OUT mV 600±150 600±180

100 / 100

Hz 40~14K 50~12.5K

TUNER SECTION

DESCRIPTION

87.5~108

50 / 50

●AM SECTION

Measuring methods in confirmity with IEC standard 315

Measurements condition AM - MW : Radio frequency = 1000/999kHz, Audio frequency = 400Hz

Reference level = 5mV/m,10mV/m on 50ohms Modulation = 30%

Test Point : MW TP1 = 603kHz, TP2 = 999kHz, TP3 = 1404kHz

No. UNIT NOMINAL L/R LIMIT L/R

1 TUNING COVER RANGE LOW ~ HIGH MW kHz

STEP AUTO/Man. kHz

2 USABLE SENSITIVITY TP 1 dBu/m ≤55 ≤65

S/N = 20dB TP 2 dBu/m ≤55 ≤65

TP 3 dBu/m ≤55 ≤65

3 S/N RATIO

(100dBu/m,30% MOD)

4 TOTAL HARMONIC DISTORTION

(74dBu/m,30% MOD)

5 OVER LOAD DISTORTION

(94dBu/m,80% MOD)

6 FREQUENCY RESPONSE at -6dB

(at 74dBu/m,400Hz)

7 SELECTIVITY 10kHz/9kHz TP 2 dB ≥23 ≥15

8 AGC FIGURE OF MERIT

(at 100dBu/m,400Hz)

9 IMAGE REJECTION TP 3 dB ≥30 ≥25

10 WHISTLE MODULATION 2IF=74dBu/m % ≤10 ≤15

3IF=94dBu/m % ≤10 ≤15

11 AUTO STOP LEVEL 999kHz dBu/m ≤46 ≤65

522kHz dBu/m ≤57 ≤75

1611kHz dBu/m ≤55 ≤70

12 TUNED LEVEL dBu/m ≤48 ≤65

13 OUTPUT LEVEL (74dBu/m,30% MOD) mV 200±50 200±70

≥40≥60

dBTP 2

TP 2 Hz 60~2.2K 100~2K

TP 2 % ≤3≤5

≤3

TP 2 dB ≥45

DESCRIPTION

TP 2 % ≤1.5

≥40

522~1611

9/9

UPD78F0536GK : IC201

1. Pin Description

64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49

1 48

2 47

3 46

4 45

5 44

6 43

7 42

8 41

9 40

10 39

11 38

12 37

13 36

14 35

15 34

16 33

17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

VDD

POWER_DOWN

VOL-UP

FLMD0

SPK_B_RLY

SPK_A_RLY

CIRCUIT DESCRIPTION

EVDD

PROTECTION

ST/BY_RLY

REGC

VSS

EVSS

KEY1

TONE_DN

FLT_CE

RMC

PLL_DA

24C08_SCLK

SET_OPTION

STEP_OPTION

VOL_DN

FLT_RESET

TONE_UP

FUN_UP

FUN_DN

24C08_SDA

HP_RLY

RESET

FUN_DATA

P32

FUN_CLK

RDS_CLK

RDS_DATA

PLL_CE

PLL_DI

PLL_CLK

GND

AVREF

FLT-CLK

FLT_DATA

TxD

RxD

STBY2

STBY1

RDS/FLT

DIGILINK

VOL_CLK

VOL_DATA

PLL_ST

PLL_TUNED

P31

FUN_ST

PLL_MUTE

MUTE

2. Block Diagram

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