Samsung RCD-750 Service Manual Download Page 1

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Summary of Contents for RCD-750

Page 1: ...OUDIESNOOTING oo cecseeesscessessesseceeees 26 30 7 ACJUStMENL ccccesceesecseeeesseesseseceeenaees 31 37 8 BIOCK diagram cecceseeseessstssceesseeees 38 39 9 Exploded view parts list 0 0 40 44 10 Schem...

Page 2: ...n door is open and interlocks defeate Avoid exposure to beam Laser diode specification Optical pick up Material GaAs GaAlAs Wavelength 760 800nm Emission duration Continuous Laser Output 0 2mW This ou...

Page 3: ...iances and Underwriters Laboratories UL 1270 40 7 With the instrument s AC switch first in the ON positin and then in the OFF position measure from a known earth ground metal waterpipe conduit etc to...

Page 4: ...ion Warning Do not alter or add replacement that does not have the same to the mechanical or electrical design of this safety characteristics as the recommended instrument Design alterations and addit...

Page 5: ...f there are any missing parts or that wires are properly fixed and any place where over heating or shock is likely to occur can be found short terminal SOH91Cl CAR walkman 2 1 6 Handling the optical p...

Page 6: ...service precautions are indicated or printed on the cabinet chassis or components When servicing follow the printed or indicated service precautions and service materials 3 The components used in the...

Page 7: ...scharging wrist strap device which should be removed for potential shock reasons prior to applying power to the unit under test 2 After removing an electrical assembly equipped with ESD devices place...

Page 8: ...th small lead 11 A defective trimming resistor cannot be adjusted externally Replace with an ordinary variable resistor 12 It is important to inspect the work with a magnifier Check after installing c...

Page 9: ...ng it Melt thin solder between the tip and part so that if flows into the part contact 5 Check work quality with a magnifier FIG 5 3 5 Chip VRs Chip Trimmer Capacitors Diodes and Tr 3 5 1 Kind of the...

Page 10: ...airblow 4 Engage the IC removing tool Use the airblow to preheat the IC for about 5 seconds then heat with the nozzle until the IC remover lifts the part from the board SE Se 4 FIG 7 LI PRY 3 6 3 Inst...

Page 11: ...usstessaveeetceseavanduesaevers 40dB 3 SO ParatiOriiaisezecsiivvecedss ceva nisdecsevecbsndvacesdeedi cincuvbes dousvadeessevdevdisivavece buadsstedeccpaedvsneuestes 33dB 4 Total harmonic distortion c...

Page 12: ...view FUNCTION switch TONE control VOLUME control TUNING PHONES jack BAND switch SBS button ee SKIP SEARCH buttons PLAY PAUSE button STOP button REC button PAUSE button PLAY button STOP EJECT button RE...

Page 13: ...3 2 Rear view i RCD 750 Siow eae eerie oe oo Le a del NI OV YOUMS 1NO LVA pue O3Y31S ONOW Wa SS ae...

Page 14: ...ease the 7 screws 4 3x20 4 1 2 Seperate the front cabinet 2 from back cabinet 3 4 2 How to disassemble Front top FIG 2 4 1 1 Release the 9 screws 1 3x10 4 1 2 Remove the speaker general clamper wire 3...

Page 15: ...ck cabinet 4 3 5 Remove the holder P T P T PCB 7 4 4 How to disassemble Chassis FIG 4 4 4 1 Release the 4 cd shafts 7 4 4 2 Release the 9 screws 2 4 4 3 Release the 1 screw 3 4 4 4 Disconnect connecti...

Page 16: ...5 Basic circuit operation 5 1 Description of LCD segments SYNG Sans fa Poal o cool fom DT fe f l cool elite lef l l 15 RCD 750...

Page 17: ...e pick up and converting signals from the disc into electrical signals 3 RF AMPLIFIER After the optical pick up detects the presence or absence of data pits on the disc surface the resulting signals r...

Page 18: ...ection Circuit The Error Detection Circuit extracts the interleaved data samples so that the signal is deinterleaved and detects most of the errors present in the present in the signal dued to flaws o...

Page 19: ...e Input Function Reset VO CKT Pin Output Condition Type P1 0 Input 4 bit input port Input C P1 1 INT1 1 or 4 bit read test possible P1 2 INT2 4 bit unit pull up resistors selectable by software P1 3 T...

Page 20: ...display expansion eae _ D A LCD synchronization clock output for LCD display expansion Input p a 1 0 1 0 Timer counter external clock input Timer counter clock output External interrupt input Trigger...

Page 21: ...17 DO 3 1 O DRIVE Ouput 18 DO 3 2 O DRIVE Ouput 19 DI 3 1 DRIVE Input 20 DI 3 2 DRIVE Input 21 VCC 1 Supply voltage 22 VCC 2 Supply voltage 23 VREF 2 5V BIAS Voltage 24 DI 4 1 DRIVE Input 25 DI 4 2 DR...

Page 22: ...pin 5 TESTM oO Mirror test pin 6 Test 1 Input pin of test 7 PFSET Peak frequency setting pin for focus tracking compensation and fc cut off frequency of CLV LPF 8 SSTOP Check the position pin of pick...

Page 23: ...rnal status output pin 34 AVEE S Analog negative power supply input pin for SERVO part 35 APDI I Input pin of DSP phase comparison output PHAS 36 F8M oO Output pin of analog VCO Normal speed 8 64 MHz...

Page 24: ...focus error amplifier 64 DVEE Digital negative power supply input pin for servo part 65 RFI Output Signal of RF summing amplifier is inputed through capacitor 66 RFO O Output pin of RF summing amplif...

Page 25: ...L GND Connection 18 AVDD2 Analog VCC2 19 RCHOUT oO Right Channel audio output through D A Converter 20 LCHOUT O Left channel audio output through D A converter 21 AVSS2 Analog Ground 2 22 VREFH 1 Inpu...

Page 26: ...nal for test 61 SEL 1 Mode Selection Terminal 1 H 33 8688MHz L 16 9344MHz 62 SEL 2 Mode Selection Terminal 2 H APLL DPLL 63 SEL 3 Mode Selection Terminal 3 H CDROM L CDP 64 SEL 4 Mode Selection Termin...

Page 27: ...eck secondary voltage of power transformer 1 Check if battery spring wire is cut 2 Check battery contacts Check if POWER LED lights RADIO 6 1 3 Output insensible Check if POWER LED lights X Refer to A...

Page 28: ...nal line oO Check voltage at all ports supplied from REC PLAY switch Check connection of JCW102 Check REC bias current Check signal at JIC1 REC input 1 10 Check if LCD lights a door Replace RQ802 Chec...

Page 29: ...at JIC1 pin 7 Check connection at EQ B line Check voltage at JIC1 pins O Check connections from tone output to function switch 6 1 7 Radio insensible Check connection of tuner B line heck voltage at...

Page 30: ...lation of NIC 9282 Check voltage at PIN 70 of NIC 9220 Check soldering and pattern of NQ 1 Check soldering of x pick up laser diode heres nop Check laser on Check Voltage of u com FOK oy Check solderi...

Page 31: ...power supply x and pin short of NIC 9282 nee Bor Nee Check waveform at pin 19 20 of NIC 9282 O Check waveform at x Check voltage at pin4 of x Replacenicaz7o pin2 9 of NIC9270 NIC 9282 oie Replace NIC...

Page 32: ...M 10 7MHz AM MW LW SW 455 or 465KHz 4 Oscilloscope 5 VTVM 6 Frequency counter 7 Loop antenna 8 Dummy load 4 7 1 2 importants 1 Check the power source voltage 2 Select desired Band and Function 3 Set T...

Page 33: ...nating highest frequency trimmer VARICON point of SSG i all a 3 Repeat steps 1 and 2 several times 4 90MHz 90MHz Not required _ Tracking Fig 2 106MHz 106MHz VCT1 ANT Maximum trimmer VARICON Output aes...

Page 34: ...t frequency coil RED resonating OT101 point of SSG AM AM OSC Best coverage Fig 4 4 1650KHz highest frequency trimmer resonating VC4 VARICON point of SSG _ __ 5 Repeat steps 3 and 4 several times Maxim...

Page 35: ...tracking AM ANT secs 5 1400KHz 1400KHz trimmer VC3 eer VARICON one 6 Repeat steps 4 and 5 to obtain suitable sensitivity at 6 00KHz and 1400KHz Connect AM SW SW OSC Best signal generator 7 5 7MHz Low...

Page 36: ...ame as 2 band s OL 102 output tracking see Fig 4 t 5 1400KH phheaa hs Maxi 2 1400KHz trimmer VC3 eeu VARICON Me ne 23 6 Repeat steps 4 and 5 to obtain suitable sensitivity at 6 00KHz and 1400KHz ___ _...

Page 37: ...3N Play the test after inserting in DECK1 Adjust the azimuth ajustment screw of left side of record play head for maximum output and for the same channel phase see Fig 9 3 Tape speed adjustment Connec...

Page 38: ...t NVR1704 so that sound comes out normally Nearly mid position of NVR1704 A ov B A B NVR 1702 VOLT DIV 0 5 V TIME DIV 2mS 7 3 3 Focus gain adjustment 1 Turn power on 2 Vref to GND and TP1 FE to positi...

Page 39: ...7 3 5 Location of adjustment points parts side FOCUS ADJUSTMENT E F BALANCE ADJUSTMENT FOCUS BIAS ADJUSTMENT ADJUSTMENT GAIN o z a4 oO 4 e GAIN RCD 750 37 1...

Page 40: ...P HEAD A CH A P HEAD AM ANT AM OSC TONE VOLUME 3 JIC14 TAPE EQ AMP S44 KA2Z2291 38 FM AM TUNER KA2293 TA8122AN KA2290 1 Bt JT501 BIAS COIL PLAY Bt 6 RQBO1 BV RQ802 AIC601 POWER AMP TAB20 7K CD Bt tev...

Page 41: ...HM 127MM 16634 515 110 CLAMPER WIRE DALB 2 A4155 0075 LCD LE 0216A 14084 0695 00 13323 0201 00 14084 0694 01 14084 0694 02 14084 0694 03 14084 0694 04 14084 0694 05 14084 0694 06 17159 0085 00 17159 0...

Page 42: ...00 Description Specification KNOB TONE ABS DEEP BLUE GRILLE SPK L SPC T0 6 SPRING BATTERY SUS PI 1 2 SPRING BATTERY C SUS PI 1 2 SPRING BATTERY B SUS PI 1 0 WINDOW SCALE PC T0 5 ANT ROD 5 2PI 728MM 4S...

Page 43: ...9 1 2 Exploded view RCD 750 FASTA AY 1 n I F N Y O BX ALS a PCB TUNER PCB MAIN PCB FRONT 42 RCD 750...

Page 44: ...128 00045AA 1 9 10000 607 116 PAUSE CAP 11117 00020AA 1 10 10000 607 111 PAUSE LOCK CAM 11116 00011AA 1 11 10000 607 113 HEAD BASE M 1105 00031AA 1 12 10000 607 145 REC SAFETY LEVER 11134 01010AA 1 13...

Page 45: ...TABLE 12 14769 057 240 MOTOR SPIN 13 14769 057 250 MOTOR FEED 14 17008 120 032 SCREW PH 15 16024 0262 01 P C B SUB 16 13349 139 061 CONNECTOR WAFER 17 13564 601 100 SWITCH LEAF RCD 750 Specification Q...

Page 46: ...e See pe Se oot OPTION _3BANO FM SH MH LT eeriow saan ricci 655666 R IC BLOCK Q2 TAPE EQ a 0m 3 e PNP NPN INPN NPN nae nae N oe POP O rem ac ght be Lt KSA733 AY Revel KSR1007 ks0B62 0 KSA70B A pi veo...

Page 47: ...r notice 1 9270 oh ate ig sc88 jo Be sure to use identical and standardized replacement parts eee especially for critical parts in the unit since many parts Nowsos LE0 in the unit have special safety...

Page 48: ...nsg o Oorrt tre Hum yYMootr x oO aa Ow rot wee OO Oo On 50 a za QoO oO Sorter ecg COAOC0A i FHF HENNE HENNE HEHE NMOYt HAHN pare Ze QO 6 oS ee Se i ooo noNnNnoNnoDaoGcG ONS wr nmo ow NN DK D VNrx rnMN...

Page 49: ...11 2 Tuner section XXX DIODE xkX AQ FD XXX TR XXX DO CO FD2 Qi I LNAWLSNFaV ONIMOVYL IH XXX IC WAFER Xxx 42 490 IF AQ CCA AM FL2 AQ HCW101 48 RCD 750...

Page 50: ...cw1 A0 RCW2 A0 KKK DIODE Xxx N N N N N N N N N D501 D502 D503 D504 D505 D506 D511 D512 D513 C0 C0 C0 C0 EQ EQ DO D0 D1 AXX TR XXX NQ501 NQ502 NQ503 NQ504 NQ505 NQ507 B1 EQ E1 D0 DO Et KKK IC WAFER XXX...

Page 51: ...CD section XXX DIODE Xxx A0 NDI B2 Bt B2 B2 A2 ND2 ND3 ND4 NDS ND6 ore NZD XXX TR XXX D0 BO A1 Nat NQ2 NQ3 cea ere A3 NQ4 NQ5 NQ6 NQ7 NQ8 Nag A2 A2 A2 C2 C3 XXX IC WAFER XXX CO D0 NCW102 NW1 49 1 RCD...

Page 52: ...12 Wiring section 50 SPEAKER R FM ROD ANT CD PCBINCW3 CD DOOR sw R P HEAD RCD 750 i...

Page 53: ...ET GUT AM RF IN AF Vcc FM OSC AM OSC MPX IN PHi PH2 OSC L CH OUT RA CH OUT cP e323 2d 18 17 4 19 14 e3 L EM RFE IN GND FM MIX AM MIX AGC Vec AM IF FM IF GNDTUNING LED QUAD DET SF LED TA8207 AIC401 KA2...

Page 54: ...KA22291 JIC 52 MUTEMUTE Sw IN 2 ALCRE EC NF 2 EC IN 2 RCD 750...

Page 55: ...13 2 CD section KA9270 NIC9270 HUTE DE EM SM SM 5 KA9258 NIC9258 PB R P MUTE MUTE NF 2 PRIN 2 SW SW IN2 ALC RECOUT 2 ALC TIME CONSTANT PU PBIN AB PBGND MUTE REC NF 1 sw IN 1 OUT t RCD 750 53...

Page 56: ...OR SOOK PHASE DETECTOR 23 BITS SHIFT REGISTER e ee FRAME SYN DECTECTOR PROTECTOR iNSERTOR 10K SRAM 3RAM ACCRESS GENERATOR X TAL TIMING GENERATOR CPU X TAL TERFA TIMING _ ve GENERATOR INTERPLOATE DIGIT...

Page 57: ...NT AVEE o NIC G3 ISTAT PFSET 42 CBH S 5 27 28 QD oO uJ wo aa x Qa TRACKING PHASE MICOM TO SERVO CONTROL ee AUTO SEQUENCER WINDOW FS1 TG4 FM1 TG7 COMPARATOR TRACKING ERROR AMP DEFECT AMP COMPARATOR DEF...

Page 58: ...652 11505 714 153 C PPOLYESTER CQ921T M 50V 0 015M K 2 JC15L 15R 11505 714 222 C POLYESTER CQ921T M 50V 0 0022M K 2 JC8L 8R 11505 714 223 C POLYESTER CQ921T M 50V 0 022M K 2 JC502 11505 714 562 C POLY...

Page 59: ...0 COIL SEVEN CAN 1R65HH I BIAS JACK HEADPHONE SHQ9085 01 142 GRN CONNECTOR JUMP 2MM 51048 0700 7P CONNECTOR JUMP 2MM 51048 1000 10P CONNECTOR WAFER 5267 02A 2P TYPE CONNECTOR WAFER 5267 04A 4P STICK C...

Page 60: ...T CH 50V 22 J C CERAMIC CC45T CH50V 24 J TAPE C CERAMIC CC45T CH 50V 47 J CONDENSER AIXAL LEAD 25V TP 050F220 CONDENSER AXIAL LEAD 50V UP050 B330 C POLYESTER CQ921T M 50V 0 015M K C POLYESTER CQ921T M...

Page 61: ...RBON RN 1 8T 220 J C CERAMIC CC45T CH 50V 5 C C CERAMIC CC45T CH 50V 7 D C CERAMIC CC45T CH 50V 10 J C CERAMIC CC45T CH 50V 15 J C POLYSTYRENE CQ09S 50V 330 J C POLYSTYRENE CQ 09 S 50V 3300 J C ELECTR...

Page 62: ...NDENSER AIXAL LEAD 25V TP 050F220 C ELECTROLYTIC SMS T 16V 33M 5X11 C ELECTROLYTIC SMS T 50V 0 1M 5X11 C ELECTROLYTIC SMS T 50V 4 7M 5X11 TR DIGITAL KSR1003 KRC103M TAPE DIODE SW 1SS53 1N4148 CT 6PF L...

Page 63: ...45T F 50V 0 01M Z CONDENSER AXIAL LEAD 16V EP050 X120 CONDENSER AXIAL LEAD 16V EPO50 X150 CONDENSER AXIAL LEAD 16V EPO50 X220 CONDENSER AXIAL LEAD 16V EP050 X680 CONDENSER AXIAL LEAD 16V EPOSOY 100 CO...

Page 64: ...972 Description Specification C CERAMIC CC45T CH 50V 33 J C ELECTROLYTIC SMS T 16V 33M 5X11 C ELECTROLYTIC SMS T 50V 0 1M 5X11 C ELECTROLYTIC SMS T 50V 4 7M 5X11 TR DIGITAL KSR1003 KRC103M TAPE DIODE...

Page 65: ...et Integrated Circuit Input Output Killohertz Killogram LED LPF Max MHz Min MOD MPX MGSW MGLS MGLK NF of NFB OP AMP ORG OSC PB PCB PLL P T R RAM REC REG REW RF ROM R P SP sec SSG ssp ST ST EJT SW TP T...

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Samsung RCD-750, Service Manual

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