Related Manuals for Sherwood RX-772
Summary of Contents for Sherwood RX-772
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Page 1: Table Of Contents
SERVICE MANUAL RX-772 STEREO RECEIVER ¢ Å ¢ Å CONTENTS - SPECIFICATION - TROUBLESHOOTING - BLOCK DIAGRAM - MECHANICAL PARTS LIST - WIRING DIAGRAM - EXPLODED VIEW - LEVEL DIAGRAM - ELECTRICAL PARTS LIST - CIRCUIT DESCRIPTION - SCHEMATIC DIAGRAMS... -
Page 2: Specification
SPECIFICATION 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. - Page 3 DESCRIPTION INPUT FREQ. REMARK UNIT NOMINAL L/R LIMIT L/R TONE CONTROL 100Hz ±10±1 ±10±3 10kHz ±10±1 ±10±3 IDLE CURRENT VOL MIN 4.5±1 4.5±1.5 NO INPUT LATER 10 MINUTE (RDS) INPUT SHORT 4.5±0.5 4.5±1 INPUT SHORT 200±30 200±50 REC OUTPUT TAPE,VIDEO (RDS) 1 kHz 200±20 200±30...
- Page 4 TUNER SECTION 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)
- Page 5 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 DESCRIPTION UNIT NOMINAL L/R...
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Page 9: Circuit Description
CIRCUIT DESCRIPTION UPD78F0536GK : IC201 1. Pin Description 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 PROTECTION ST/BY_ R LY AVREF SPK_ B _ R LY FLT-CLK SPK_ A _ R LY HP_ R LY FLT_ D ATA RESET... - Page 11 3. Pin Function Pin Name Pin Symbol Pin Description P120/INTP0/EXLVI PROTECTION Input for protection ST/BY_RLY Output for standby relay SPK_B_RLY Output for speaker B relay SPK_A_RLY Output for speaker A relay HP_RLY Output for headphone relay RESET RESET Input for u-com reset P124/XT2/EXCLKS Not used P123/XT1...
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Page 12: 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 FM Antenna input Impedance 75 ohm 20uH ( 1kHz ) AM Loop Antenna 2. Electrical Characteristics. T.L. -
Page 13: 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 501 D) Connector's disconnection or disjunction. CP(500, 503) Change or close insertion of the connector. - Page 14 Symptom Cause and Remedy Ref No. AMP Sound Dead. A) Signal Mute TR's inferior. Q 352( L, R), Q318(L, R) 1. "LEFT" Channel dead. B) Connector disconnection & disjunction. CP101, CN102 2. "RIGHT" Channel dead. Change or close insertion of the connector. C) Speaker wire's disjunction.
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Page 15: Mechanical Parts List
¡ Ú MECHANICAL PARTS LIST (RX-772) ¢ À Parts without Parts No. are not supplied. DESCRIPTION Q'TY PARTS No. VER. PACKAGE INSTRUCTION MANUAL 5707000000100S INSTRUCTION MANUAL 5707000000340S BOX, INNER CARTON 6017210040010S BOX, INNER CARTON 6017210040020S CUSHION, SNOW 6230210234000S PE, SHEET 750*1460/SET 6327040059000S POLY BAG, 330*240*0.05... - Page 16 DESCRIPTION Q'TY PARTS No. VER. CHASSIS, MAIN 3200210276010S FOOT ASS'Y, Titan Stamp 4008210221000SZ G-T/K-T FOOT ASS'Y, Gold Stamp 4008210221010SZ K-G/K-B SPACER, KNOB 4300040561010S POWER TRANS, 230V/50Hz 8200960610361S POWER TRANS, 220V/60Hz 8200960610401S HEAT SINK, AL6063 Ext H:70mm 2120210328400S BRACKET, PCB 4010212356000S PCB ASS'Y, INPUT TER, RCA 2PIN G601207AEG02YS...
- Page 18 ELECTRICAL PARTS LIST (RX-772) ¢ À Parts without Parts NO are not supplied. REF No. DESCRIPTION Q'TY PARTS No. VER. PCB1 ASSEMBLY P.C.BOARD MAIN 7025HK0606020 PCB1 ASSEMBLY P.C.BOARD MAIN 7025HK0606040 COILS L201 BEAD COIL, SMD1608 TYPE D340160800060S L301L/R INDUCTOR COIL, 0.5UH...
- Page 19 REF No. DESCRIPTION Q'TY PARTS No. VER. C325L/R CERAMIC HIK DISC 100 pF D004101277050S C326L/R CERAMIC HIK DISC 100 pF D004101277050S C331 ELECT GE 85C 10 uF D040100087070S C332L/R ELECT GE 85C 10 uF D040100087070S C333L/R ELECT GE 85C 47 uF D040470083080S C334L/R CERAMIC CHIP HIK...
- Page 20 REF No. DESCRIPTION Q'TY PARTS No. VER. D135/D136 1SS133T, SWITCHING K000013300520S D201-D203 1SS133T, SWITCHING K000013300520S D301L/R 1SS133T, SWITCHING K000013300520S D302-D305 1SS133T, SWITCHING K000013300520S D307 1SS133T, SWITCHING K000013300520S D308L/R 1N4148W, SWITCHING CHIP K005041480020S D309L/R 1N4148W, SWITCHING CHIP K005041480020S D310 IN4007, SWITCHING K000400700520S D311L/R 1SS133T, SWITCHING...
- Page 21 REF No. DESCRIPTION Q'TY PARTS No. VER. Q316L/R KTC2875B(MB), NPN J5222875B0010S Q317L/R KTA1268BL, PNP J5001268B0050S Q318L/R KTC2875B(MB), NPN J5222875B0010S Q320 KRC106M, PNP J6020106M0010S Q501 KTC1027Y, NPN J5021027Y0020S Q502 KRC106M, PNP J6020106M0010S Q503-Q505 KTC3200BL, NPN J5023200B0050S Q506/Q507 KTA1268BL, PNP J5001268B0050S Q508 KTC3200BL, NPN J5023200B0050S Q509/Q510...
- Page 22 REF No. DESCRIPTION Q'TY PARTS No. VER. R254 CARBON FILM 10 ohm 1/5W C00001006P520S R255 CHIP THICK 22 kohm 1/16W C20002236M160S R256-R259 CHIP THICK 1 kohm 1/16W C20001026M160S R260-R263 CHIP THICK 100 ohm 1/16W C20001016M160S R264/R265 CHIP THICK 47 kohm 1/16W C20004736M160S R266...
- Page 23 REF No. DESCRIPTION Q'TY PARTS No. VER. R348L/R CHIP THICK 47 kohm 1/16W C20004736M160S R349L/R CARBON FILM 22 ohm 1/5W C00002206P520S R350L/R CHIP THICK 47 kohm 1/16W C20004736M160S R351L/R CHIP THICK 100 ohm 1/16W C20001016M160S R352L/R CHIP THICK 10 kohm 1/16W C20001036M160S R353L/R...
- Page 24 REF No. DESCRIPTION Q'TY PARTS No. VER. F501 FUSE CLIP G645000050010S F501B FUSE CLIP G645000050010S FPC101 CN.FPC 1.25MM (21P) L131112100010S FPC201 CN.FPC 1.25MM (15P) L131111500010S GT3/GT4 TERMINAL 3790040886000S TERMINAL 3790040886000S J201-J204 CN,WIRE 1P L045084006040S J205 CN,WIRE 1P L045084006040S J206 CN,WIRE 1P L045084006040S J208/J209 CN,WIRE 1P...
- Page 25 REF No. DESCRIPTION Q'TY PARTS No. VER. JK105 TER,RCA 2PIN G601207AEG11YS JK301 TER,BOARD SCREW 8P G614081T3600AS JK601 TER,RCA 4PIN G602405BG040YS R213/R214 CHIP THICK 0 ohm 1/16W C20000006M160S R302L/R CN,WIRE 1P L045084006040S R306L/R CN,WIRE 1P L045084006040S RLY301/RLY302 RELAY, 12V SPK G680120528010S RLY303 RELAY, 12V SPK G680120528010S...
- Page 26 REF No. DESCRIPTION Q'TY PARTS No. VER. C404 CERAMIC CHIP HIK 0.1 uF D011104597160S C405 CERAMIC CHIP HIK 0.01 uF D011103777160S C406 CERAMIC CHIP T.C 220 pF D010221167160S C407 CERAMIC CHIP HIK 0.01 uF D011103777160S C408 CERAMIC CHIP T.C 39 pF D010390167160S C409-C413 CERAMIC CHIP HIK...
- Page 27 REF No. DESCRIPTION Q'TY PARTS No. VER. SW501 SW,PUSH G000122006060S PCB3 ASSEMBLY P.C.BOARD INPUT 7025HK0606022 PCB3 ASSEMBLY P.C.BOARD INPUT 7025HK0606042 C101L/R CERAMIC CHIP T.C 100 pF D010101167160S C102L/R CERAMIC CHIP T.C 100 pF D010101167160S C103L/R CERAMIC CHIP T.C 100 pF D010101167160S C105L/R CERAMIC CHIP T.C...
- Page 28 REF No. DESCRIPTION Q'TY PARTS No. VER. Q401L/R KTC2875B(MB), NPN J5222875B0010S R101L/R CHIP THICK 470 ohm 1/16W C20004716M160S R102L/R CHIP THICK 470 kohm 1/16W C20004746M160S R103L/R CHIP THICK 470 ohm 1/16W C20004716M160S R104L/R CHIP THICK 470 kohm 1/16W C20004746M160S R105L/R CHIP THICK 470 ohm 1/16W...
- Page 29 EXCLK FLMD0 RESET...