Sherwood RD-7502 Manual de usuario

RD-7502

AUDIO/VIDEO RECEIVER

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

SPECIFICATION ................................................. 2

VIDEO SECTION ................................................ 5

TUNER SECTION ............................................... 9

BLOCK DIAGRAMS ......................................... 11

WIRING DIAGRAM .......................................... 13

CIRCUIT DESCRIPTION ................................... 14

TUNER ALIGNMENT ....................................... 17

TROUBLESHOOTING ...................................... 18

MECHANICAL PARTS LIST ............................. 21

EXPLODED VIEW ............................................. 22

ELECTRICAL PARTS LIST ................................ 23

IC’S FUNCTIONAL BLOCK DIAGRAMS.......... 30

PRINTED CIRCUIT BOARDS ............................ 39

SCHEMATIC DIAGRAMS................................. 46

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(AUS/RDS), 220V/60Hz(K)

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

* EXT IN INPUT * TONE OFF

No. DESCRIPTION INPUT FREQ. REMARK UNIT LIMIT L/R NOMINAL

L/R

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

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

(STEREO IN) 1kHz R/O-3dB 0.12 0.08

20KHz R/O-3dB 0.2 0.12

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

at 1% THD (STEREO IN) 1kHz W 95 100

20KHz W85 90

4 S/N RATIO, INPUT SHORT

IHF-A FILTER

5 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 : LLLLY

* EXT IN INPUT * TONE OFF

No. DESCRIPTION INPUT FREQ. REMARK UNIT LIMIT NOMINAL

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

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

(STEREO IN) 1kHz R/O-3dB 0.12 0.08

20KHz R/O-3dB 0.2 0.12

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

at 1% THD (STEREO IN) 1kHz W 95 100

20KHz W85 90

4 S/N RATIO, INPUT SHORT EXT IN INPUT

IHF-A FILTER

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

EXT IN INPUT 1KHz R/O

1KHz R/O

SPECIFICATION

dB 85 90

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

* EXT IN INPUT * TONE OFF

No. DESCRIPTION INPUT FREQ. REMARK UNIT LIMIT L/R NOMINAL

L/R

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

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

(STEREO IN) 1kHz R/O-3dB 0.12 0.08

20KHz R/O-3dB 0.3 0.2

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

at 1% THD (STEREO IN) 1kHz W 95 100

20KHz W85 90

4 S/N RATIO, INPUT SHORT EXT IN INPUT

IHF-A FILTER

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

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

* EXT IN INPUT * TONE OFF

No. DESCRIPTION INPUT FREQ. REMARK UNIT LIMIT L/R NOMINAL

L/R

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

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

(STEREO IN) 1kHz R/O-3dB 0.12 0.08

20KHz R/O-3dB 0.3 0.2

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

at 1% THD (STEREO IN) 1kHz W 95 100

20KHz W85 90

4 S/N RATIO, INPUT SHORT EXT IN INPUT

IHF-A FILTER

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

dB 85

R/O dB

1KHz R/O

85 90

1KHz

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

* EXT IN INPUT * TONE OFF

No. DESCRIPTION INPUT FREQ. REMARK UNIT LIMIT L/R NOMINAL

L/R

1 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 : LLLLY

* TONE OFF(TONE DIRECT)

No. DESCRIPTION INPUT FREQ. REMARK UNIT LIMIT L/R NOMINAL

L/R

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

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

3 RESIDUAL NOISE 1kHz VOL min. mV 2.0 1.5

(INPUT SHORT) 1kHz VOL max. mV

4 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

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

at 1% THD CD 1kHz W 95 100

(20)KHz W85 90

6 S/N RATIO, IHF-A FILTER 1kHz R/O dB 85 90

1kHz 1W dB

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

CD(300mV) 1kHz dB 55 65

10kHz dB 40 50

8 FUNCTION CROSSTALK 1kHz dB 60 65

(INPUT SHORT) 10kHz dB 40 45

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

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

(TONE ON) 10kHz dB ±10(±3) ±10(±2)

11 HEADPHONE OUTPUT(STEREO)

H/P = 64ohms

12 CINEMA EQ(SPK : LLLY) SUB-CH(300mV) 10kHz 1W dB -4.5±1.5 -4.5±1

3.0±0.5CD(300mV) 1kHz R/O V 3.0±1.0

CD(300mV)

CD TAPE IN

Impedance : Video output level at 75 ohm

Test Equipment : SCOPE,VN30A1

DISC : TDV - 540 TEST DISC (ABEX)

MEASUREMENT POSITION : AT MONITOR OUT

No. INPUT REMARK UNIT LIMIT NOMINAL

1 WHITE 100% C-VIDEO Vp-p 1±0.4 1±0.2

HPF 100KHz

LPF 4.2MHz

SC Trap ON

Color S/N 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

HPF 100KHz

LPF 4.2MHz

SC Trap ON

Color S/N HPF 10KHz

* ALC:OFF LPF 500KHz

* RANGE:AUTO

* BOTH

40 45

VIDEO SECTION

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

DESCRIPTION

OUTPUT LEVEL

S/N RATIO

WHITE 50% TITLE2 CHAP.4 dB

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

40 45

Brightness S/N

(VN30A1)

MAGENTA TITLE2 CHAP.17

AM dB 40 45

DESCRIPTION

OUTPUT LEVEL

S/N RATIO

WHITE 50% TITLE2 CHAP.4

Brightness S/N

(VN30A1)

dB 40 45

MAGENTA TITLE2 CHAP.17

AM dB 40 45

PM dB 40 45

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

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

DESCRIPTION

OUTPUT LEVEL

BURST LEVEL Color Bar Play (Title 2,Chap 1) C-VIDEO mVp-p 282±80 282±50

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

DESCRIPTION

OUTPUT LEVEL

BURST LEVEL Color Bar Play (Title 2,Chap 1) C-VIDEO mVp-p 282±100 282±80

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

DESCRIPTION

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

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

DESCRIPTION

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

(7) INPUT : COMPONENT OUTPUT : COMPONENT

DESCRIPTION

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

DOLBY DIGITAL INPUT SECTION

INPUT : COAXIAL (CD DIGITAL)

SURROUND MODE : DOLBY DIGITAL

VOLUME POSISTION : 55dB

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:LLLY,BACK-NO SURR 1KHz 14,16 V 9.5±1 9.5±2

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 CENTER 1KHz 38 0.3 0.5

LPF(20KHz) SURR 1KHz 38 0.3 0.5

SPK MODE:LLLY,BACK-NO 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:LLLY,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 OUT PUT CONFIG 1 FRONT 1KHz 38(ref)

SPK MODE : SSSY,BACK-NO 20

Ref : 1KHz 0dB CENTER 1KHz 38(ref)

SURR 1KHz 38(ref)

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

7 OUT PUT CONFIG 2 FRONT 1KHz 38(ref)

SPK MODE : LSSN,BACK-NO 18

8 DOWNMIXING TEST CENTER 1KHz 10(ref)

SPK MODE : LSSY,BACK-NO C NO

SURR.L 1KHz 14

LS NO

SURR.R 1KHz 16

SY:ON

FRONT 1KHz 6(ref)

-17±3

No. DESCRIPTION INPUT FREQ.

-17±3

6.0±2

dB 7.5±1

5.5±1

CHAP

-17±1dB

UNIT

dB -3±0.5 -3±1

-17±1

dB -3±0.5

6.0±1

5.5±2

7.5±2

-3±1

DOLBY-EX INPUT SECTION

INPUT : COAXIAL, CD DIGITAL

SURROUND MODE : DOLBY-EX

VOLUME POSISTION : 55dB

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

SPEC

NOMI. LIMIT

1 OUT PUT LEVEL

Disc : DOLBY-EX -23dB

LLLY,BACK - L

2 T.H.D

Disc : DOLBY-EX -23dB

LPF(20KHz)

LLLY,BACK - L

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 L,L,L,Y,N DTS TEST Disc(TRACK 9,10,11,12,13,14,15)

SPEC

NOMI. LIMIT

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

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

LLLY,BACK -NO SURR 1KHz 12,13 V10±110±2

S/W 30Hz 15 V

1.0±0.6 1.0±0.8

2 THD FRONT 1KHz 10,11 0.3 0.5

Disc : DTS 0dB CENTER 1KHz 14 0.3 0.5

LPF(20KHz) SURR 1KHz 12,13 0.3 0.5

LLLY,N BACK -NO S/W 30Hz 15 0.3 0.5

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

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

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

LLLY,N S/W 30Hz 15 dB 65 60

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

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

700±70 700±100BC 1KHz 7 mV

65 60

BC 1KHz 7 0.3 0.5

TRACK UNIT

BC 1KHz STOP dB

No. INPUT FREQ.DESCRIPTION

DESCRIPTION UNITNo. INPUT FREQ. TRACK

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

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

Measuring methods in confirmity with IEC standard 315

Measurements condition FM : Ref. frequency = ( 98.1MHz), Audio frequency = 1KHz

Reference level = 1mv on (75ohms, 300ohms) Deviation : Filter = B.P.F at STEREO and MONO

Test Point:TP1 = 90.1MHz,TP2 = 98.1MHz, TP3 = 106.1MHz(100KHz STEP)

MOD : MONO = 75kHz, STEREO = 67.5kHz ±7.5kHz (A)

MONO = 40kHz, STEREO = 40kHz ±4kHz (AUS/RDS/K)

Power supply : 120V/60Hz(A), 230V/50Hz(AUS/RDS), 220V/60Hz(K)

FM SECTION

NOMI. LIMIT

1 TUNING COVER RANGE LOW ~ HIGH MHz

STEP (A/K) AUTO/MANUAL KHz

(AUS/RDS) AUTO/MANUAL KHz

2 USABLE SENSITIVITY TP 1 dBu 12 15

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

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

3 AUTO STOP LEVEL dBu 25±625±8

4 S/N RATIO IHF "A" MONO dBu 55 50

STEREO dBu 50 45

5 T.H.D MONO 1KHz 0.7 1.2

STEREO 1KHz 1.0 1.5

6OVER LOAD DISTORTION(120dBu, 75KHz) MONO Db 2 3

7STEREO SEPARATION FILTER = B.P.F 250Hz dBu 30 25

MAIN 90%, PILOT 10% (A) 1KHz dBu 30 25

MAIN 53.5%, PILOT 10% (AUS/RDS/K) 6.3KHz dBu 20 15

8 FREQUENCY RESPONSE

75us, -3dB (A)

50us, -3dB (AUS/RDS/K)

9 IF REJECTION (A) dB 65 60

(AUS/RDS/K) dB 75 70

10 IMAGE REJECTION (A) dB 20 18

(AUS/RDS/K) dB 75 70

11 AM SUPRESSION (AT AM 30% 1KHz) dB 40 35

12 OUPUT LEVEL MONO (A) 500±100 500±150

(AUS/RDS/K) 280±100 280±150

13 RDS SENSITIVITY TP2 dBf 30 35

TUNER SECTION

87.5~108

100 / 100

50 / 50

SPEC

UNITDESCRIPTIONNo.

TP2 Hz 60~8K 70~7K

TP 1

TP 3

MONO mv rms

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