JVC-RCBX33SL-cs-sch维修电路原理图.pdf
SERVICE MANUAL PORTABLE CD SYSTEM Contents Safety precautions .1-2 Preventing static electricity .1-3 Disassembly method.1-4 Adjustment method.1-7 Description of major IC.1-13 RC-BX33SL ? ? ? ? !?#$?%?$ ? ( 2 ) R/P swith in recording state; ( 3 ) Adjusting T201 use a plastic screwdriver, AC bias frepuency;62+-1KHZ. 3TAPE SPEED ADJUSTMENT ( 1 ) Insert the test tape(MTT-111N,3,000 HZ) ( 2 ) Press the PLAY button. ( 3 ) Use a flat-tip screwdriver to turn the MOTOR VR adjust MOTOR VR so that the frequency counter become 3,000Hz CASSETTE MECHANISM SECTION CASS DECK P/R HEAD HEAD AZIMUTH ADJUSTING SCREW 1-8 RC-BX33SL Tape recorder section Items Measurement Measurement method StandardAdjusting conditionsValuespositions ConfirmationTest tape1 Playback the test tape TCC-182A (8KHz)MaximumAdjust the head of head angle:TCC-182A(8KHz)2 With the recording & playback mechanism, outputazimuth screw Measurement output adjust the head azimuth screw so that theonly terminal left and right output levers become :Speaker terminal maximum, After adjustment, lock the Sparker R head azimuth at least by half turn. (Load resistance:8?) :Headphone terminal ConfirmationTest tapeAdjust VR401 so that the frequency counterTape speed MOTOR VR of tape speed:TCC-112(3KHz)reading becomes 3,010Hz +/-15Hz whenof deck Measurement outputplaying back the test tape TCC-112 (3KHz):3,010Hz terminalwith playback and recording mechanism+/-15Hz :Headphone terminalafter ending forward winding of the tape. Reference Values for Confirmation Items ITEMS Measurement Measurement method StandardAdjusting conditionsValuespositions Wow & flutterTest tapeWhen the test tape TCC-112 (3KHz) has been 0.25% or :TCC-112(3KHz)played back with the recording and playbackless mechanism at the beginning of forward(WRMS) Measurement outputwinding, the frequency counter reading of terminalwow & flutter should be 0.25% or less :Headphone terminal(WRMS). 1-9 RC-BX33SL Electrical Performance ITEMS Measurement Measurement method StandardAdjusting conditionsValuespositions Adjustment of * Mode: PB mode1 With the recording and playback mechanism, recording bias * Recording mode load the test tapes TDK-D60, and set the TDK-D60 current* Test tape: TDK-D60 mechanism to the recording and pausing4.5?A (Reference condition in advance . +/-0.5?A Value)* Measurement output terminal2 After connecting 100ohms in series to the :Both recording and recorder head, measure the bias current headphone terminals with a valve voltmeter at both of the terminals Adjustment of* Reference frequency 1 with the recording and playback mechanism,Output recording and:1KHz and 8KHz load the test tapes (TDK-D60) and set thedeviation playback (REF.:- 10dB) mechanism to the recording and pausingbetween frequency* Test tape: TDK-D60 condition in advance.1KHz and characteristics8KHz * Measurement input2 While repetitively inputting the reference:-1dB +/-2dB terminal: OSC IN frequency signal of 1KHz and 8KHz from OSC IN, record and playback the tape. 3 While receding and playback the test tape Lch and Rch so that the output deviation between 1KHz and 8KHz becomes -1dB +/-2dB Reference Values for Electrical Function Confirmation Items Items Measurement Measurement method StandardAdjusting conditionsValuespositions Recording* Playback1 While changing over to and form BIAS 162KHzT201 bias* Test tape: TDK-D60 and 2, confirm that the frequency is+/-6KHz frequency changed * Measurement2 With the recording and playback terminal : BIAS TP on mechanism, load the test tape. P.C. board (TDK-D60 ) , and set the mechanism to the recording and pausing condition in advance. 3 Confirm that the BIAS TP frequency on the P.C. board is 62KHz +/-6KHz 1-10 RC-BX33SL Flow of functional operation until TOC read Check Point Check that the voltage at the pin 17 of CN901 is OV (a moment)? Check that the voltage at the pin1 of IC902 + side is + 5V? Confirm that the Focus error s-cuve signal at the pin16 of IC902 is approx.2V p-p Confirm that the signal from TE waveform at TOC readingpin14 IC902 is 0V as a accelerated pulse during approx.400ms Confirm the waveform of the Tracking error signal at the pin14 of IC902 (R926) (See fig-1) Confirm the eys-pattern at the lead of TP1 Power Key Slider turns REST SW ON. Automatic tuning of TE offset Laser ON Detection of disc Auto tuning of Focus offset Auto. measurement of focus A-curve amplitude Disc is rotated Focus servo ON (Tracking servo ON) Auto. measurement of Tracking error amplitude Automatic tuning of Tracking error Automatic tuning of Focus error balance Automatic tuning of Focus error gain Automatic tuning of Tracking error gain TOC reading Play a disc Approx 3sec pin 25 of IC601(TE) Approx 1.8V Trackin g servo Tracking servo on statues Disc to be braked to stop TOC reading finishes Disc status to rotate Auto measurement of TE amplitude and auto tuning of TE balance 500mV/div 2mS/div Fig.1 VREF 1-11 TUNER ADJUSTMENTS use a plastic screw driver for adjustments. Adjust the intermediate frequency of AM and FM to the frequency of ceramic filter . Supply voltage : DC 12.0 V Speaker impedance : 8 OHMS Function switch : RADIO a.AM AdjustmentBAND SELECT SWITCH : AM steAdjustingTuningInput ConnectionOutput ConnectionAdjustmentOscilloscope circuitFrequencyMeasurementinputMeasurementoutputparts 1IF1000 KHzAM SweepLoopTP4(H)T105 (455 / 465KHz)GeneriorANTOscilloscopeTP8(E) (Non-adjustment) 2Tuning520KHzTP4(H)T102 3Coverage1640/1740 KHz-OscilloscopeTP8(E)PVC4 4600 KHzAM SignalLoopTP4(H)MW COIL 51400 KHzGeneriorANTOscilloscopeTP8(E)PVC3Maximum b. FM AdjustmentBAND SELECT SWITCH : FMFM Dummy Antenna : 75 ohm unbalance steAdjustingTuningInput ConnectionOutput ConnectionAdjustmentOscilloscope circuitFrequencyMeasurementinputMeasurementoutputparts 1IFFM SweepTP4(H)TP4(H)T104 (10.7 MHz)98.0 MHzGeneratorTP3(E)OscilloscopeTP8(E)T106 (Non-adjustment) 2Tuning87.4 MHzTP4(H)L104 3Coverage108.3 MHz-FM ANT.OscilloscopeTP8(E)PVC2 490.0 MHzFM SignalFM ANTTP4(H)L103Confirm with being 5Tracking106.0 MHzGeneratorTP1 (E)OscilloscopeTP8(E)PVC1near by effective TP2(H)sensitivity 1-12 RC-BX33SL LA1824 123456789101112 242322211816151413 AM RF AM MIX AM OSC FM MIX ST LED TUN LED FM IF AM-IF S-METERDET PHASE COMP VCC2GND2 REGVCC1 GND1 AGC TRIGST SWVCOFFFFFF PILOT DET FM RF 20 FM OSC 1917 DECODER DET Pin No. 1 2 3 4 5 6 7 8 Pin No. 1 2 3 4 5 6 7 8 Function AM-RF input Reg AM-OSC VCC1 FM-MIX output GND1 AM-MIX output Tuning in dicator Function AM-RF input Reg AM-OSC VCC1 FM-MIX output GND1 AM-MIX output Tuning in dicator Pin No. 9 10 11 12 13 14 15 16 Pin No. 9 10 11 12 13 14 15 16 Function AM-IF output FM-IF input AM-IF input AM-AGC FM-DET Pilot detector filter AM/FM Switch L output Function AM-IF output FM-IF input AM-IF input AM-AGC FM-DET Pilot detector filter AM/FM Switch L output Pin No. 17 18 19 20 21 22 23 24 Pin No. 17 18 19 20 21 22 23 24 Function R output MPX input AM/FM detector output FM-OSC VCC2 FM-RF output GND2 FM-RF input Function R output MPX input AM/FM detector output FM-OSC VCC2 FM-RF output GND2 FM-RF input Major ICs Description LA4227 1 2 3 4 5 6 1 2 3 4 5 6 STANDBY OUT2 BS2 NF2 IN2 DC(FILTER) STANDBY OUT2 BS2 NF2 IN2 DC(FILTER) 7 8 9 10 11 12 7 8 9 10 11 12 PRE GND IN1 NF1 BS1 OUT1 VCC PRE GND IN1 NF1 BS1 OUT1 VCC BIAS CIRCUIT - + Ch1 THERMAL SHUT DOWN PROTECTION STANDBY SW - + Ch2 Rf2 20KOHM RNF262KOHM Rf1 20KOHM RNF1 62KOHM 121011978 132465 STANDBY OUT2 BS2 PWR GND (TAB) NF2 IN2 DC(FILTER) VCC OUT1 BS1 PWR GND (TAB) NF1 IN1 PRE GND RC-BX33SL 1-13 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 PW GND OUT(-)1 PVCC1 OUT(+)1 VIN1 Vr1 Vc1 VIN2 PW GND OUT(-)1 PVCC1 OUT(+)1 VIN1 Vr1 Vc1 VIN2 9 10 11 12 13 14 15 16 9 10 11 12 13 14 15 16 OUT(+)2 PVCC2 OUT(-)2 PW GND PW GND OUT(-)3 PVCC3 OUT(-)3 OUT(+)2 PVCC2 OUT(-)2 PW GND PW GND OUT(-)3 PVCC3 OUT(-)3 17 18 19 20 21 22 23 24 17 18 19 20 21 22 23 24 VIN3 SGND SVCC1 VIN4 OUT(+)4 PVCC4 OUT(-)4 PW GND VIN3 SGND SVCC1 VIN4 OUT(+)4 PVCC4 OUT(-)4 PW GND TA2092N 1-14 RC-BX33SL TA2153FN 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 - + - + - + - + BOTTOM PEAK AGC Amp. - + 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 - + - + - + - + - + 3 STATE DET I-I - + - + I-I - + - + - + - + - + 10pF 20K 60K 20K 20K 12K 12K 20K 11K 100 100K 100K 11K 20K 36pF 10K 50K15K 15K 3pF 30K 10K 10K 30K 3pF 10pF 20K 48K 21.82K 2.9K 83K SW1 1K SW2 SW3 1.4K 2.26K 13K 238K 15pF 238K 15pF 90K 60K60K 20K150K 40pF 1K 1K 150K 40pF Pin No. 1 2 3 4 5 6 Pin No. 1 2 3 4 5 6 Function VCC RFGC GMAD FNI FPI TPI Function VCC RFGC GMAD FNI FPI TPI Pin No. 13 14 15 16 17 18 Pin No. 13 14 15 16 17 18 Function TEN TEO SBAD FEO FEN SEB Function TEN TEO SBAD FEO FEN SEB Function TNI MDI LDO SEL TEB 2VRO Function TNI MDI LDO SEL TEB 2VRO Pin No. 7 8 9 10 11 12 Pin No. 7 8 9 10 11 12 Function VRO RFRP BTC RFCT PKC RFRPIN Function VRO RFRP BTC RFCT PKC RFRPIN Pin No. 19 20 21 22 23 24 Pin No. 19 20 21 22 23 24 Pin No. 25 26 27 28 29 30 Pin No. 25 26 27 28 29 30 Function RFGO GVSW AGCIN RFO GND RFN2 Function RFGO GVSW AGCIN RFO GND RFN2 RC-BX33SL 1-15 JVC Asia Pte Ltd 101 Thomson Road, #28-04 United Squares, Singapore 307591 (No: 28208) Printed in Singapore 200104(L) RC-BX33SL SERVICE MANUAL PORTABLE CD SYSTEM Contents Block diagram.2-2 Wiring diagram .2-3 Schematic diagram.2-4 Printed circuit boards .2-6 RC-BX33SL ? ? ? ? !?#$?%?$ ?&?(? )? ?*?+?,?(?(?-?(?(?. /? 0?(?& &?1 ?(?2,?33? 4? ?2?&,?0?(?& &?)?&?(? ?(?(?&?(? No: 28208sch DEC. 2001 COPYRIGHT 2001 JVC ASIA PTE LTD RC-BX33SL Area Suffix UX-Saudi and relative U-Except UX 2-2 RC-BX33SL BLOCK DIAGRAM ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?!? ? ?! #?$ ? ? !?!? !?!?%?!?& ?!?!? #?$ ? !? ? ? ? ? ? ?!? ? ? RCRC-BX33SL 2-3 Wiring Diagram Circuit Diagram -1 RC-BX33SL 2-4 RC-BX33SL 2-5 Circuit Diagram -2 RC-BX33SL 2-6 Printed Circuit Boards JVC Asia Pte Ltd 101 Thomson Road, #28-04 United Squares, Singapore 307591 (No: 28208) Printed in Singapore 200104(L) RC-BX33SL
