Sherwood RD-7502 Service Manual
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Sherwood RD-7502 Service Manual

Audio/video receiver
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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
CONTENTS
TROUBLESHOOTING ...................................... 18
MECHANICAL PARTS LIST ............................. 21
EXPLODED VIEW ............................................. 22
ELECTRICAL PARTS LIST ................................ 23
PRINTED CIRCUIT BOARDS ............................ 39
SCHEMATIC DIAGRAMS................................. 46
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  • Page 1: Table Of Contents

    RD-7502 AUDIO/VIDEO RECEIVER CONTENTS SAFETY PRECAUTIONS ........1 TROUBLESHOOTING ........18 SPECIFICATION ..........2 MECHANICAL PARTS LIST ......21 VIDEO SECTION ..........5 EXPLODED VIEW ..........22 TUNER SECTION ..........9 ELECTRICAL PARTS LIST ........ 23 BLOCK DIAGRAMS ......... 11 IC’S FUNCTIONAL BLOCK DIAGRAMS..

  • Page 2: Safety Precautions

    SAFETY PRECAUTIONS WARNING Before servicing this unit, familiarize yourself with the following precautions: 1. Many electrical and mechanical parts in this exposed metal parts of the cabinet, such as chassis have special safety characteristics that terminals, screw heads, and metal overlays, to often pass unnoticed and the protection be sure the set is safe to operate danger of afforded by them cannot necessarily be...

  • Page 3: Specification

    SPECIFICATION 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.
  • Page 4 SURROUND AMP SECTION * SPKR LEVEL : ALL 0dB * SPK SIZE : LLLLY * EXT IN INPUT * TONE OFF NOMINAL LIMIT L/R DESCRIPTION INPUT FREQ. REMARK UNIT INPUT SENSITIVITY EXT IN INPUT 1kHz 300±50 300±30 TOTAL HARMONIC DISTORTION EXT IN INPUT 40Hz R/O-3dB...
  • Page 5 SUBWOOFER SECTION * SPKR LEVEL : ALL 0dB * SPK SIZE : LLLLY * EXT IN INPUT * TONE OFF NOMINAL LIMIT L/R DESCRIPTION INPUT FREQ. REMARK UNIT PRE OUTPUT LEVEL SUB-CH(300mV) 30Hz VOL max. 3.5±1.0 3.5±0.5 STEREO SECTION * SPKR LEVEL : ALL 0dB * SPK SIZE : LLLLY * TONE OFF(TONE DIRECT) NOMINAL...

  • Page 6: Video Section

    VIDEO SECTION Impedance : Video output level at 75 ohm Test Equipment : SCOPE,VN30A1 DISC : TDV - 540 TEST DISC (ABEX) MEASUREMENT POSITION : AT MONITOR OUT (1) INPUT : C-VIDEO OUTPUT : C-VIDEO DESCRIPTION INPUT REMARK UNIT LIMIT NOMINAL OUTPUT LEVEL WHITE 100%...
  • Page 7 (3) INPUT : C-VIDEO OUTPUT : S-VIDEO DESCRIPTION INPUT REMARK UNIT LIMIT NOMINAL OUTPUT LEVEL WHITE 100% Vp-p 1±0.4 1±0.2 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 INPUT REMARK UNIT...
  • Page 8 DOLBY DIGITAL INPUT SECTION INPUT : COAXIAL (CD DIGITAL) SURROUND MODE : DOLBY DIGITAL VOLUME POSISTION : 55dB AT SPEAKER OUT Disc:LD VER 1.0 SPEC DESCRIPTION INPUT FREQ. CHAP UNIT NOMI. LIMIT OUT PUT LEVEL FRONT 1KHz 9.5±1 9.5±2 8 ,12 Disc All CH 0dB CENTER 1KHz...
  • Page 9 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 DESCRIPTION INPUT FREQ. TRACK UNIT NOMI. LIMIT OUT PUT LEVEL Disc : DOLBY-EX -23dB 1KHz 700±70 700±100...

  • Page 10: Tuner Section

    TUNER SECTION 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)
  • Page 11 AM SECTION Measurements condition AM - MW : Radio. frequency = 1000/999KHz , Audio frequency = 400Hz Reference level = (74dBu/m),(50)ohms Modulation = ( 30 )% Test Point : MW TP 1 = (594)KHz , TP 2 = (999)KHz , TP 3 = (1404)KHz SPEC DESCRIPTION UNIT...

  • Page 12: Block Diagrams

    BLOCK DIAGRAMS (VIDEO - I) Model No. : RD-7502...
  • Page 13 BLOCK DIAGRAMS (AUDIO - II) Model No. : RD-7502...

  • Page 14: Wiring Diagram

    WIRING DIAGRAM Model No. : RD-7502 PCB6 (HDMI) PCB7 (ST-BY) PCB1 (MAIN) PCB4 (AMP) PCB2 (FRONT) PCB2-2 (AUTO SETUP) PCB2-1 (FUNC)

  • Page 15: Circuit Description

    CIRCUIT DESCRITION Model No. : RD-7502 MB90F488PBF-GE1LQFP : IC402 1. Pin Description 2. Blcok Diagram 10MHZ X0, X1, RST Clock control X0A, X1A MC16LX series core Circuit MD2, MD1, MD0 Interrupt controller 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81...
  • Page 16 3. Pin Functions Pin No. Symbol Description FL_CLK Clock signal output for PT6315. FL_DATA Data signal output for PT6315. FL_SW/ST_BY RLY Output to "FL_B+ ON/OFF" (At "H", it is active) ST/BY_LED Output to drive STAND-BY LED(At "H", it is active) H/P_RLY Output to "H/P Relay ON/OFF"...
  • Page 17 Pin No. Symbol Description UPGRADE UPGRADE KEY3_INTERRUPT INTERRUPT for KEY3. TUNED Input for detecting "TUNED" condition(At "L", it is active) PLL_DATA Data signal output for "LC72131" PLL_CLK Clock signal output for "LC72131" PLL_DATAIN Input from "LC72131" RDS_CLK Clock signal input from "BU1924" PLL_CE Output for chip enable of "LC72131"...

  • Page 18: Tuner Alignment

    TUNER ALIGNMENT 1. Electrical specification SPECIFICATION ITEMS Local OSC Above the receiving Frequency 522 ~1620kHz 87.5 ~ 108.0MHz Frequency cover range 12 +/-0.5V Standard supply voltage 75 ohm unbalance FM Antenna Impedance 9.5uH ( 1kHz ) : S0160BL-25 AM Loop Antenna 2.

  • Page 19: Troubleshooting

    TROUBLESHOOTING Symptom Cause and Remedy Ref No. Power On Failure A) AC-Cord check. 1. FLT does not light up. B) Power Trans (Main/ST-BY) check. 2. ST-BY LED does not light up. C) Fuse's disconnection check. F ( 300,301) D) Connector's disconnection or disjunction. Change or close insertion of the connector.
  • Page 20 Symptom Cause and Remedy Ref No. B) TONE I.C check. I.C No. ( 401 ) 1. Signal IN/OUT terminal check. 2. I.C voltage check. ( +7.5)V, ( -7.5 )V I.C PIN No. ( 16,18 ) 3. I.C CLK/DATA/STB/MUTE I.C PIN No. (69,68,70,71) AMP Sound Dead.
  • Page 21 Symptom Cause and Remedy Ref No. Digi-Link Failure. A) Digi-link line disconnection check. Digi-Link IN/OUT circuit check. R ( 485,437 ), D ( 513 ),C (451) B) Micom Interface Port Check. 1. µ-COM I.C B+( 3.3 )V check. 2 . Digi-link data I/O data check. I.C NO.

  • Page 22: Mechanical Parts List

    MECHANICAL PARTS LIST Model No. : RD-7502 DESCRIPTION Q'TY PARTS No. VER. DESCRIPTION Q’TY PARTS No. VER. Parts without Parts NO are not supplied. KNOB ASS'Y, POWER 5088210818030SZ A-B/E-B/G-B CABINET, TOP 3007041236081S Parts without version mentioned are common ones. KNOB ASS'Y, POWER...

  • Page 23: Exploded View

    EXPLODED VIEW Model No. : RD-7502...

  • Page 24: Electrical Parts List

    ELECTRICAL PARTS LIST Model No. : RD-7502 DESCRIPTION REF No. DESCRIPTION Q'TY PARTS No. VER. REF No. Q'TY PARTS No. VER. Parts without Parts No. are not supplied. D413 1N4148W, SWITCHING CHIP K005041480020S C525 ELECT GE 85C 4.7 uF D0404R7087250S Parts without version mentioned are common ones.
  • Page 25 Model No. : RD-7502 DESCRIPTION DESCRIPTION DESCRIPTION REF No. Q'TY PARTS No. VER. REF No. Q'TY PARTS No. VER. REF No. Q'TY PARTS No. VER. R443 CHIP THICK 2.2 kohm 1/16W J C20002226M160S R536LB CHIP THICK 2.2 kohm 1/16W J...
  • Page 26 Model No. : RD-7502 REF No. DESCRIPTION Q'TY PARTS No. VER. REF No. DESCRIPTION Q'TY PARTS No. VER. REF No. DESCRIPTION Q'TY PARTS No. VER. PCB1-3 ASSEMBLY P.C.BOARD GUIDE R C741 CERAMIC HIK AXIAL 0.01 uF D005103773530S C130 CERAMIC CHIP T.C...
  • Page 27 Model No. : RD-7502 DESCRIPTION REF No. Q'TY PARTS No. VER. REF No. DESCRIPTION Q'TY PARTS No. VER. REF No. DESCRIPTION Q'TY PARTS No. VER. C901 ELECT GE 85C 470 uF D040471082060S R158 CHIP THICK 1 kohm 1/16W J C20001026M160S PCB4 ASSEMBLY P.C.BOARD AMP...
  • Page 28 Model No. : RD-7502 DESCRIPTION DESCRIPTION DESCRIPTION REF No. Q'TY PARTS No. VER. REF No. Q'TY PARTS No. VER. REF No. Q'TY PARTS No. VER. C210SL CERAMIC HIK DISC 100 pF 500V D00410106D050S R204SBR CARBON FILM 33 kohm 1/5W C00003336P520S...
  • Page 29 Model No. : RD-7502 REF No. DESCRIPTION Q'TY PARTS No. VER. REF No. DESCRIPTION Q'TY PARTS No. VER. REF No. DESCRIPTION Q'TY PARTS No. VER. R226SL CARBON FILM 100 kohm 1/5W C00001046P520S C253 ELECT GE 85C 1 uF D040010087150S Q207/Q208...
  • Page 30 Model No. : RD-7502 REF No. DESCRIPTION Q'TY PARTS No. VER. DESCRIPTION REF No. DESCRIPTION Q'TY PARTS No. VER. REF No. Q'TY PARTS No. VER. R264 CHIP THICK 200 ohm 1/16W J C20002016M160S CP305 CN.WAFER 7.92MM L108353280260S R324-R335 CHIP THICK...

  • Page 31: Ic's Functional Block Diagrams

    IC’S FUNCTIONAL BLOCK DIAGRAMS Model No. : RD-7502 SC16315 : IC701 NJM2274 : IC209 Power Save Pin No. Pin Name Description Data input pin. Input serial data at rising edge of shift clock, Seg1/ starting from the low order bit.
  • Page 32 TMDS341 : IC800(HDMI) 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 HPD_SINK SDA_SINK HPD2 SCL_SINK SDA2 SCL2 HPD1 9 10 11 12 13 14 15 16 17 18 19 20 (3.3 V) Rx w/ Rx w/...
  • Page 33 AK4588 : IC800(DSP) TEST1 INT1 BOUT TVDD DVDD AVSS DVSS AVDD VREFH VCOM TEST3 MCKO2 (Top View) MCKO1 COUT ROUT1 UOUT VOUT LOUT1 SDTO2 BICK2 ROUT2 LRCK2 SDTO1 LOUT2 BICK1 LRCK1 ROUT3 CDTO...
  • Page 34 Pin Name Function INT1 Interrupt 1 Pin Block-Start Output Pin for Receiver Input BOUT “H” during first 40 flames. TVDD Output Buffer Power Supply Pin, 2.7V~5.5V DVDD Digital Power Supply Pin, 4.5V~5.5V DVSS Digital Ground Pin X'tal clock Output Pin X'tal / External clock Input Pin Test 3 Pin TEST3...
  • Page 35 Pin Name Function No Connect pin No internal bonding. This pin should be opened. ROUT3 DAC3 Rch Analog Output Pin No Connect pin No internal bonding. This pin should be opened. LOUT2 DAC2 Lch Analog Output Pin No Connect pin No internal bonding.
  • Page 36 NJW1197 : IC401 LAIN RAIN CAIN LSAIN Supply RSAIN Voltage LBAIN RBAIN SWAIN LATCH µCOM DATA Interface CLOCK L1IN MUTE Multi-channel R1IN DCLA1 DCLA2 L2IN TONE LOUT Volume R2IN L3IN DCRA1 DCRA2 TONE R3IN ROUT Input Selector Gain L4IN R4IN COUT L5IN R5IN...
  • Page 37 F2602E : IC101 LSDP_TXRX HSDP_EN SC_TX_OUT HSDP_CLK SC_RX_IN HSDP_DATA XMDTIC COMMAND_SEL TEST IRQ# OSC_IN RESET# OSC_OUT SLAVE_SEL Function Function Type Notes Pin Name in Slave Mode in Master Mode S=In Low Speed Data Port Output Low Speed Data Port Input LSDP_TXRX LVTTL S/T M=Out...
  • Page 38 Function Function Type Notes Pin Name in Slave Mode in Master Mode DT Comm Bus Internal DT Comm Bus Internal Output COMM_TX_M LVDS out- Transmitter Differential Negative Out Transmitter Differential Negative Out DT Comm Bus Internal DT Comm Bus Internal Output COMM_TX_P LVDS out+...
  • Page 39 TMS320DA607 : IC805 GP0[4](EXT_INT4)/AMUTEIN1 GP0[0] GP0[6](EXT_INT6) AFSX1 AMUTE1 GP0[5](EXT_INT5)/AMUTEIN0 GP0[7](EXT_INT7) ACLKX1 AHCLKX0 AXR0[8]/AXR1[7] AXR0[9]/AXR1[6] AXR0[10]/AXR1[5] ACLKX0 AXR0[11]/AXR1[4] ACLKR0 AXR0[1]/AXR1[14] AXR0[12]/AXR1[3] AFSX0 AXR0[13]/AXR1[2] AFSR0 AXR0[14]/AXR1[1] AXR0[0]/AXR1[15] AXR0[15]/AXR1[0] FSX1 ACLKR1 AFSR1 CLKX1 ED0/GP1[0] ED1/GP1[1] ED2/GP1[2] ED3/GP1[3] ED5/GP1[5] ED4/GP1[4] ED7/GP1[7] ED6/GP1[6] DA607 and DA605 Digital Signal Processors L2 Cache/ L1P Cache EMIF8...

  • Page 40: Printed Circuit Boards

    PRINTED CIRCUIT BOARDS (I) Model No. : RD-7502 PCB1 (MAIN-TOP)
  • Page 41 PRINTED CIRCUIT BOARDS (II) Model No. : RD-7502 PCB1 (MAIN-BOTTOM)
  • Page 42 PRINTED CIRCUIT BOARDS (III) Model No. : RD-7502 PCB2 (FRONT-TOP) PCB2 (FRONT-BOTTOM)
  • Page 43 PRINTED CIRCUIT BOARDS (IV) Model No. : RD-7502 PCB3 (DSP-TOP) PCB3 (DSP-BOTTOM)
  • Page 44 PRINTED CIRCUIT BOARDS (V) Model No. : RD-7502 PCB4 (AMP-TOP) PCB4 (AMP-BOTTOM)
  • Page 45 PRINTED CIRCUIT BOARDS (VI) Model No. : RD-7502 PCB5 (VIDEO-TOP) PCB5 (VIDEO-BOTTOM)
  • Page 46 PRINTED CIRCUIT BOARDS (VII) Model No. : RD-7502 PCB6 (HDMI-TOP) PCB7 (ST-BY-TOP) PCB6 (HDMI-BOTTOM) PCB7 (ST-BY-BOTTOM)

  • Page 47: Schematic Diagrams

    SCHEMATIC DIAGRAMS (I) Model No. : RD-7502 PCB1 (MAIN-1)
  • Page 48 SCHEMATIC DIAGRAMS (II) Model No. : RD-7502 PCB1 (MAIN-2)
  • Page 49 SCHEMATIC DIAGRAMS (III) Model No. : RD-7502 PCB2 (FRONT)
  • Page 50 SCHEMATIC DIAGRAMS (IV) Model No. : RD-7502 PCB3 (DSP)
  • Page 51 SCHEMATIC DIAGRAMS (V) Model No. : RD-7502 PCB4 (AMP)
  • Page 52 SCHEMATIC DIAGRAMS (VI) Model No. : RD-7502 CONTROL OUTPUT B(Q7) A(Q6) S-MON CVBS-MON PCB5 (VIDEO) CVBS MIXED CVBS MIXED MM74HC4053 - IC211 MM74HC4052 B(Q9) A(Q0) OUTPUT VIDEO1 VIDEO2 Q0, Q9:S-VIDEO - IC218 TR Bias Resistor TYPE R1(B) R2(B-E) KRC101S KRC102S...
  • Page 53 SCHEMATIC DIAGRAMS (VII) Model No. : RD-7502 PCB6 (HDMI)
  • Page 54 SCHEMATIC DIAGRAMS (VIII) Model No. : RD-7502 PCB7 (ST-BY) +3V3(ST/BY) ST RLY...
  • Page 55 SCHEMATIC DIAGRAMS (IX) Model No. : RD-7502 TUNER ASS’Y(A ONLY)
  • Page 56 SCHEMATIC DIAGRAMS (X) Model No. : RD-7502 TUNER ASS’Y(E/K ONLY)
  • Page 57 SCHEMATIC DIAGRAMS (XI) Model No. : RD-7502 TUNER ASS’Y(RDS ONLY)
  • Page 58 Printed in Korea 07K02 5737045830010...

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