Sherwood NewCastle R-772 Manuale utente

R-772

AUDIO/VIDEO RECEIVER

SAFETY PRECAUTIONS ................................... 1

SPECIFICATIONS .............................................. 2

TUNER SECTION .............................................. 7

BLOCK DIAGRAMS ............................................ 9

WIRING DIAGRAM ........................................... 12

CIRCUIT DESCRIPTION .................................. 13

ALIGNMENT PROCEDURES .......................... 18

TROUBLESHOOTING....................................... 21

MECHANICAL PARTS LIST.............................. 25

EXPLODED VIEW............................................. 26

ELECTRICAL PARTS LIST............................... 27

IC’S FUNCTIONAL BLOCK DIAGRAMS........... 35

PRINTED CIRCUIT BOARDS........................... 37

SCHEMATIC DIAGRAMS ................................. 45

CONTENTS

SAFETY PRECAUTIONS

WARNING

Before servicing this unit, familiarize yourself with the following precautions:

1. Many electrical and mechanical parts in this

chassis have special safety characteristics that

often pass unnoticed and the protection

afforded by them cannot necessarily be

obtained by using replacement components

rated for higher voltage, wattage, etc.

Replacement parts that have these special

safety characteristics are identified in this

manual and its supplements: electrical

components having such features are identified

by in the schematic diagram and the parts

list.

Before replacing any of these components,

read the parts list in this manual carefully. The

use of substitute replacement parts that do not

have the same safety characteristics as

specified in the parts list may create shock, fire,

or other hazards.

2.Before returning the set to the customer,

always do an AC leakage current check on the

exposed metal parts of the cabinet, such as

terminals, screw heads, and metal overlays, to

be sure the set is safe to operate danger of

electrical shock. Plug the AC line cord directly

into a 120 V AC outlet(USA Version) or 230 V

AC outlet(EU Version). (Do not use a line

isolation transformer during this check.) Be sure

your AC voltmeter has a sensitivity of 5000 Ω

per volt or greater. Then connect a 1500 Ω10

watt resistor, paralleled by a 0.15 µF 150 V AC

capacitor, between a known good earth

ground(such as a water pipe, or conduit) and

the exposed metallic parts, one at a time.

Measure the AC voltage across the combination

of a 1500 Ωresistor and a 0.15 µF capacitor.

Reverse the AC plug at the AC outlet and

repeat AC voltage measurements for each

exposed metalic part. Voltage measured must

not exceed 0.75 V RMS. This corresponds to

0.2 mA AC. Any value exceeding this limit

constitutes a potential shock hazard and must

be corrected immediately.

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

Measurements conditions,unless otherwise noted :

Output resistive load = (6) ohms / Both channel driven

Tone Direct ON , Other SW's : OFF

Nominal input level : 5mV for MM, 0.5mV for MC, 500mV 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 : 120V/60Hz (A), 230V/50Hz (RDS)

FRONT AMP SECTION * SPKR LEVEL:ALL 0dB * SPK SIZE:YES

* EXT IN INPUT * TONE OFF * X-OVER:FULL RANGE

INPUT FREQ. REMARK UNIT LIMIT L/R NOMINAL

L/R

INPUT SENSITIVITY EXT IN INPUT 1kHz R/O mV 300±50 300±30

TOTAL HARMONIC DISTORTION EXT IN INPUT 40Hz R/O-3dB 0.12 0.08

(STEREO IN) 1kHz 0.12 0.08

20KHz 0.2 0.12

CONTINUOUS AVERAGE POWER EXT IN INPUT 40Hz (6)ohms W 85 90

at 1 % THD 1kHz W 95 100

(STEREO IN) 20KHz W85 90

S/N RATIO, INPUT SHORT EXT IN INPUT 1kHz R/O dB 85 90

IHF-A FILTER

FREQUENCY RESPONSE (-3dB) EXT IN INPUT 1W / 1kHz Ref. Hz~kHz 20~50 20~55

CENTER AMP SECTION(FRONT CENTER) * SPKR LEVEL:ALL 0dB * SPK SIZE:YES

* EXT IN INPUT * TONE OFF * X-OVER:FULL RANGE

INPUT FREQ. REMARK UNIT LIMIT L/R NOMINAL

L/R

INPUT SENSITIVITY EXT IN INPUT 1kHz R/O mV 300±50 300±30

TOTAL HARMONIC DISTORTION EXT IN INPUT 40Hz R/O-3dB 0.12 0.08

(STEREO IN) 1kHz 0.12 0.08

20KHz 0.2 0.12

CONTINUOUS AVERAGE POWER EXT IN INPUT 40Hz (6)ohms W 85 90

at 1 % THD 1kHz W 95 100

(STEREO IN) 20KHz W85 90

S/N RATIO, INPUT SHORT EXT IN INPUT 1kHz R/O dB 85 90

IHF-A FILTER

FREQUENCY RESPONSE (-3dB) EXT IN INPUT 1W / 1kHz Ref. Hz~kHz 20~50 20~55

SURROUND AMP SECTION * SPKR LEVEL:ALL 0dB * SPK SIZE:YES

* EXT IN INPUT *TONE OFF * X-OVER:FULL RANGE

INPUT FREQ. REMARK UNIT LIMIT L/R NOMINAL

L/R

INPUT SENSITIVITY EXT IN INPUT 1kHz R/O mV 300±50 300±30

TOTAL HARMONIC DISTORTION EXT IN INPUT 40Hz R/O-3dB 0.12 0.08

(STEREO IN) 1kHz 0.12 0.08

20KHz 0.3 0.2

CONTINUOUS AVERAGE POWER EXT IN INPUT 40Hz (6)ohms W 85 90

at 1 % THD 1kHz W 95 100

(STEREO IN) 20KHz W85 90

DESCRIPTION

NO.

SPECIFICATIONS

NO.

INPUT FREQ. REMARK UNIT LIMIT L/R NOMINAL

L/R

S/N RATIO, INPUT SHORT EXT IN INPUT 1kHz R/O dB 85 90

IHF-A FILTER

FREQUENCY RESPONSE EXT IN INPUT 1W / 1kHz Ref. Hz~kHz 20~50 20~55

SURROUND BACK AMP SECTION * SPKR LEVEL:ALL 0dB * SPK SIZE:YES

* EXT IN INPUT * TONE OFF * X-OVER:FULL RANGE

INPUT FREQ. REMARK UNIT LIMIT L/R NOMINAL

L/R

INPUT SENSITIVITY EXT IN INPUT 1kHz R/O mV 300±50 300±30

TOTAL HARMONIC DISTORTION EXT IN INPUT 40Hz R/O-3dB 0.12 0.08

(STEREO IN) 1kHz 0.12 0.08

20KHz 0.3 0.2

CONTINUOUS AVERAGE POWER EXT IN INPUT 40Hz (6)ohms W 85 90

at 1 % THD 1kHz W 95 100

(STEREO IN) 20KHz W85 90

S/N RATIO, INPUT SHORT EXT IN INPUT 1kHz R/O dB 85 90

IHF-A FILTER

FREQUENCY RESPONSE EXT IN INPUT 1W / 1kHz Ref. Hz~kHz 20~50 20~55

SUBWOOFER SECTION * SPKR LEVEL:ALL 0dB * SPK SIZE:YES

* EXT IN INPUT * TONE OFF * X-OVER:FULL RANGE

INPUT FREQ. REMARK UNIT LIMIT L/R NOMINAL

L/R

PRE OUTPUT LEVEL SUB-CH(300mV) 30Hz VOL. MAX V 3.5±1.0 3.5±0.5

STEREO SECTION * SPKR LEVEL:ALL 0dB * SPK SIZE:YES

* TONE OFF(TONE DIRECT) * X-OVER:FULL RANGE

INPUT FREQ. REMARK UNIT LIMIT L/R NOMINAL

L/R

INPUT SENSITIVITY CD 1kHz mV 300±50 300±30

CHANNEL BALANCE CD 1kHz R/O TO -40dB dB ±3±2

RESIDUAL NOISE(INPUT SHORT) CD 1kHz VOL min. mV 2.0 1.5

TOTAL HARMONIC DISTORTION (40)Hz R/O-3dB 0.12 0.08

CD (300mV) 1kHz 0.12 0.08

(20)KHz 0.2 0.12

CONTINUOUS AVERAGE POWER (40)Hz (6)ohms W 85 90

at 1 % THD CD 1kHz W 95 100

(20)KHz W85 90

S/N RATIO, IHF-A FILTER CD (300mV) 1kHz R/O dB 85 90

CHANNEL SEPARATION 100Hz R/O-3dB dB 50 65

CD (300mV) 1kHz dB 55 65

10kHz dB 40 50

FUNCTION CROSSTALK CD TAPE IN 1 kHz dB 60 65

(INPUT SHORT) 10 kHz dB 40 45

FREQUENCY RESPONSE (-3dB) CD (300mV) 1W Hz~kHz 20~50 20~55

TONE CONTROL , ±(10)dB 100Hz 1W dB ±10(±3) ±10(±2)

(TONE ON) 10kHz dB ±10(±3) ±10(±2)

HEADPHONE OUTPUT(STEREO)

H/P = 64ohms

CINEMA EQ(SPK ; LLLY) CD (300mV) 10kHz 1W dB -4.5±1.5 -4.5±1

NO.

NO. DESCRIPTION

3.0±0.51kHz R/O V 3.0±1.0

11 CD (300)mV

NO. DESCRIPTION

DESCRIPTION

DOLBY DIGITAL INPUT SECTION

* INPUT : COAXIAL (CD DIGITAL)

* SURROUND MODE : DOLBY DIGITAL

* VOLUME POSISTION : 55dB

* CONFIG1:SPK YES BACK-NO/X-OVER:ALL 80Hz

* CONFIG2:SPK YES /SUBWOOFER,BACK-NO/X-OVER:FRONT FULL RANGE,OTHERS 80Hz

* AT SPEAKER OUT Disc:LD VER 1.0

SPEC

NOMI. LIMIT

1 OUT PUT LEVEL FRONT 1KHz 8 ,12 V 9.5±1 9.5±2

Disc All CH 0dB CENTER 1KHz 10 V 9.5±1 9.5±2

SPK MODE:YES,BACK-NO SURR 1KHz 14,16 V 9.5±1 9.5±2

X-OVER:ALL FULL RANGE S/W 30Hz 18 V 1.0±0.5 1.0±0.8

2 T.H.D FRONT 1KHz 38 %0.3 0.5

Disc 0dB LPF(20KHZ) CENTER 1KHz 38 %0.3 0.5

SPK MODE:YES,BACK-NO SURR 1KHz 38 %0.3 0.5

X-OVER:ALL FULL RANGE S/W 30Hz 18 %0.25 0.3

3 S/N FRONT 1KHz 6dB 65 60

LPF(20KHz) CENTER 1KHz 6dB 65 60

JIS-A FILTER,Disc -20dB SURR 1KHz 6dB 65 60

SPK MODE:YES,BACK-NO S/W 30Hz 18 dB 65 60

4 DYNAMIC RANGE FRONT 1KHz 38 dB -11±1 -11±2

CENTER 1KHz 38 dB -11±1 -11±2

SURR 1KHz 38 dB -11±1 -11±2

S/W 30Hz 18 dB 0±10±2

5 DIALOG FRONT 43 dB -10±0.5 -10±1

NORMALIZATION CENTER 43 dB -10±0.5 -10±1

SURR 43 dB -10±0.5 -10±1

S/W 43 dB -10±0.5 -10±1

6 CONFIG 1 FRONT 1KHz 38(ref)

Ref : 1KHz 0dB 20

CENTER 1KHz 38(ref)

SURR 1KHz 38(ref)

Ref : 30Hz 0dB S/W 30Hz 18(ref)

7 CONFIG 2 FRONT 1KHz 38(ref)

8 DOWNMIXING TEST CENTER 1KHz 10(ref)

SPK:YES C->NO

X-OVER:FULL RANGE SURR.L 1KHz 14

LS->NO

SURR.R 1KHz 16

RS->NO

FRONT 1KHz 6(ref)

ST:ON

-17±1

-17±3

6.0±2

dB -3±0.5

6.0±1

No. DESCRIPTION INPUT FREQ.

CHAP

-17±1dB

UNIT

5.5±2

7.5±2

-3±1

5.5±1

-17±1

-3±0.5

dB 7.5±1

-3±1

dB -3±1

DOLBY-EX INPUT SECTION

* INPUT : COAXIAL, CD DIGITAL

* SURROUND MODE : DOLBY-EX

* VOLUME POSISTION : 55dB

* AT SPEAKER OUT SPK MODE YES,BACK-YES DOLBY-EX TEST Disc(TRACK 7)

SPEC

NOMI. LIMIT

1 OUT PUT LEVEL

Disc : DOLBY-EX -23dB

YES,BACK - L

2 T.H.D

Disc : DOLBY-EX -23dB

LPF(20KHz)

SPK:YES,BACK - 2CH

3 S/N

Disc 0dB,JIS "A"

LPF(20KHz)

DTS INPUT SECTION

* INPUT : COAXIAL, CD DIGITAL

* SURROUND MODE : DTS

* VOLUME POSISTION : 55dB

* AT SPEAKER OUT SPK MODE YES BACK-N DTS TEST Disc(TRACK 9,10,11,12,13,14,15)

SPEC

NOMI. LIMIT

1 OUT PUT LEVEL FRONT 1 KHz 10,11 V10±110±2

Disc : DTS 0dB CENTER 1 KHz 14 V10±110±2

SPK MODE:YES,BACK-NO SURR 1 KHz 12,13 V10±110±2

X-OVER:ALL FULL RANGE S/W 30 Hz 15 V 1.0±0.6 1.0±0.8

2 THD LPF(20KHZ) FRONT 1 KHz 10,11 %0.3 0.5

Disc : DTS 0dB CENTER 1 KHz 14 %0.3 0.5

SPK MODE:YES,BACK-NO SURR 1 KHz 12,13 %0.3 0.5

X-OVER:ALL FULL RANGE S/W 30 Hz 15 %0.3 0.5

3 S/N FRONT 1 KHz 10,11 dB 65 60

Disc 0dB,JIS "A" CENTER 1 KHz 14 dB 65 60

LPF(20KHz) SURR 1 KHz 12,13 dB 65 60

YES,BACK-N S/W 30 Hz 15 dB 65 60

4 DTS+NEO6 FRONT 1 KHz 9V 1.0±0.2 1.0±0.4

OUTPUT LEVEL CENTER 1 KHz 9V 1.0±0.2 1.0±0.4

Disc:ALL CH(1KHz,-20dB) SURR 1 KHz 9mV 75±20 75±30

YES,BACK-Y (L 2CH) S-BACK 1 KHz V 1.0±0.2 1.0±0.4

CHAPDESCRIPTION UNIT

BC 1 KHz

No. INPUT FREQ.

UNITNo. INPUT FREQ. CHAPDESCRIPTION

700±70 700±100

7mV

0.3 0.5

BC 1 KHz STOP dB 65 60

BC 1KHz

VIDEO SECTION

* Load : Video output 75 ohm * MEASUREMENT POSITION : AT MONITOR OUT

* DISC : TDV - 540 TEST DISC (ABEX) * TEST INSTRUMENT : SCOPE,VN30A1

No. INPUT REMARK UNIT LIMIT NOMINAL

1 WHITE 100% C-VIDEO Vp-p 1±0.4 1±0.2

2HPF 100KHz

LPF 4.2MHz

SC Trap ON

Color S/N (VN30A1) HPF 10Khz

*ALC:OFF LPF 500KHz

*RANGE:AUTO

*BOTH

No. INPUT REMARK UNIT LIMIT NOMINAL

1 WHITE 100% Vp-p 1±0.4 1±0.2

2HPF 100KHz

LPF 4.2MHz

SC Trap ON

Color S/N (VN30A1) HPF 10Khz

*ALC:OFF LPF 500KHz

*RANGE:AUTO

*BOTH

No. INPUT REMARK UNIT LIMIT NOMINAL

1 WHITE 100% Vp-p 1±0.4 1±0.2

No. INPUT REMARK UNIT LIMIT NOMINAL

1 WHITE 100% Vp-p 1±0.4 1±0.2

No. INPUT REMARK UNIT LIMIT NOMINAL

WHITE 100% Y Vp-p 1±0.4 1±0.2

R-Y Vp-p 0.5±0.2 0.5±0.1

B-Y Vp-p 0.5±0.2 0.5±0.1

No. INPUT REMARK UNIT LIMIT NOMINAL

WHITE 100% Y Vp-p 1±0.4 1±0.2

R-Y Vp-p 0.5±0.2 0.5±0.1

B-Y Vp-p 0.5±0.2 0.5±0.1

No. INPUT REMARK UNIT LIMIT NOMINAL

WHITE 100% Y Vp-p 1±0.4 1±0.2

R-Y Vp-p 0.5±0.2 0.5±0.1

B-Y Vp-p 0.5±0.2 0.5±0.1

(7) INPUT:COMPONENT OUTPUT : COMPONENT

DESCRIPTION

1 OUTPUT LEVEL Color Bar Play (Title 2,Chap 1)

(6) INPUT : S-VIDEO OUTPUT : COMPONENT(A ONLY)

DESCRIPTION

1 OUTPUT LEVEL Color Bar Play (Title 2,Chap 1)

DESCRIPTION

1 OUTPUT LEVEL Color Bar Play (Title 2,Chap 1)

(5) INPUT : C-VIDEO OUTPUT : COMPONENT(A ONLY)

C-VIDEO mVp-p 282±100 282±80

(4) INPUT : S-VIDEO OUTPUT : S-VIDEO

DESCRIPTION

OUTPUT LEVEL

BURST LEVEL Color Bar Play (Title 2,Chap 1)

C-VIDEO mVp-p 282±80 282±50

DESCRIPTION

OUTPUT LEVEL

BURST LEVEL Color Bar Play (Title 2,Chap 1)

(3) INPUT : C-VIDEO OUTPUT : S-VIDEO

PM dB 40 45

Brightness S/N

(VN30A1)

MAGENTA TITLE2 CHAP.17 AM dB 40 45

40 45

S/N RATIO

WHITE 50% TITLE2 CHAP.4 dB

(2) INPUT : S-VIDEO OUTPUT : C-VIDEO

DESCRIPTION

OUTPUT LEVEL

MAGENTA TITLE2 CHAP.17 AM dB 40

PM dB 40

(1) INPUT : C-VIDEO OUTPUT : C-VIDEO

DESCRIPTION

OUTPUT LEVEL

S/N RATIO

WHITE 50% TITLE2 CHAP.4

Brightness S/N

(VN30A1) dB 40

Measuring methods in confirmity with IEC standard 315

Measurements condition FM : Radio frequency = 98.1MHz, Audio frequency = 1kHz

Reference level = 1mV on ( 75ohms , 300ohms )

Deviation : MONO = ±75kHz, Stereo = ±67.5kHz±7.5kHz (A) Filter = B.P.F at STEREO MONO

MONO = ±40kHz, Stereo = ±40kHz±7.5kHz (RDS)

Test Point : TP 1 = 90.1MHz, TP 2 = 98.1MHz, TP 3 = 106.1MHz (100KHz STEP(A), 50KHz STEP(RDS))

Power supply : 120V/60Hz (A), 230V/50Hz (RDS)

FM SECTION

UNIT LIMIT L/R NOMINAL L/R

TUNING RANGE LOW ~ HIGH MHz

STEP (A) AUTO/Man. kHz

STEP (RDS) AUTO/Man. kHz

USABLE SENSITIVITY TP 1 dBu 12 15

S/N = 30dB (A) TP 2 dBu 12 15

S/N = 26dB (RDS) TP 3 dBu 12 15

AUTO STOP LEVEL dBu 25±625±8

S/N RATIO MONO dBu 55 50

IHF-A STEREO dBu 50 45

T. H. D MONO 1kHz 0.7 1.2

STEREO 1kHz 1.0 1.5

OVER LOAD DISTORTION(120dBu, 75kHz) MONO dB 2 3

STEREO SEPARTION 250Hz dBu 30 25

(MAIN 90%(A), 53.5%(RDS), PILOT 10%) 1kHz dBu 30 25

EXT 19kHz FILTER 6.3kHz dBu 20 15

FREQUENCY RESPONSE(75us(A), 50us(RDS) -3dB) TP 2 Hz 60~8K 70~7K

IF REJECTION (A) 65 60

IF REJECTION (RDS) 75 70

IMAGE REJECTION (A) dB 20 18

IMAGE REJECTION (RDS) dB 75 70

AM SUPRESSION(AT AM 30% 1kHz) dB 40 35

OUTPUT LEVEL MONO (A) 500±100 500±150

OUTPUT LEVEL MONO (RDS) 280±100 280±150

RDS SENSITIVITY (RDS ONLY) TP 2 dBf 30 35

TUNER SECTION

NO.

100/100

DESCRIPTION

87.5~108

50/50

TP 1 dB

TP 3

TP 2 mV rms

AM SECTION

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

Reference level = 74dBu/m), (50) ohms Modulation = 30%

Test Point : MW TP1 = (600)kHz TP2 = (1000)kHz TP3 = (1400)kHz (A)

Test Point : MW TP1 = (594)kHz TP2 = (999)kHz TP3 = (1404)kHz (RDS)

UNIT LIMIT L/R NOMINAL L/R

TUNING COVER RANGE (A) LOW ~ HIGH MW kHz

TUNING COVER RANGE (RDS) LOW ~ HIGH MW kHz

STEP (A) AUTO/Man. kHz

STEP (RDS) AUTO/Man. kHz

USABLE SENSITIVITY TP 1 dBu/m 63 65

S/N = 20dB TP 2 uV/m 63 63

TP 3 uV/m 63 63

S/N RATIO (100)dBu/m, 30% MOD TP 2 dB 35 30

T. H. D 74dBu/m, 30% MOD TP 2 % 2 3

OVER LOAD DISTORTION 100dBu/m, 80% MOD TP 2 % 3 5

FREQUENCY RESPONSE

(at 74dBu/m, 400Hz)-NO FILTER

SELECTIVITY AT SN : 20dB, ±10kHz(A)

SELECTIVITY AT SN : 20dB, ±9kHz(RDS)

AGC FIGURE OF MERIT (at 100dBu/m) TP 2 dB 50 40

IMAGE REJECTION TP 3 dB 28 25

WHISTLE MODULATION (74dBu/m, 900Hz) 2IF % 10 15

TUNED LEVEL 1000kHz(A), 999kHz(RDS) dBu/m 55±10 55±15

AUTO STOP LEVEL 1000kHz(A), 999kHz(RDS) dBu/m 55±10 55±15

OUTPUT LEVEL 74dBu/m, (30)% MOD mV rms 200±100 200±150

520~1710

522~1611

10/10

NO.

AT-6dB Hz

DESCRIPTION

80~2K 100~1.8K

TP 2 dB 23 20

Model No.:R-772

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