JVC-MXK30-cs-sm维修电路原理图.pdf

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1、SERVICE MANUAL COMPACT COMPONENT SYSTEM No.21084 Oct. 2002 COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD. MX-K30/MX-K10 MX-K30/MX-K10 Contents Safety precautions Important for laser products Preventing static electricity Disassembly method Adjustment method Flow of functional operation until TOC read

2、Maintenance of laser pickup Replacement of laser pickup Description of major ICs 1-2 1-3 1-4 1-5 1-18 1-20 1-21 1-21 1-2228 Area Suffix JU.S.A. CCanada BASS-REFLEXBASS-REFLEX CD-R/RW PLAYBACK 3-CD PLAY TW2111A, Reverse ; TW2121A Fast Forward and Rewind ; TW2231A 9. Test disc : CTS-1000(12cm),GRG-121

3、1(8cm) 10. Jitter meter Measurement conditions Power supply voltage AC120V (60Hz) Measurement output terminal : Speaker out : TP101(Measuring for TUNER/DECK/CD) : Dummy load 6ohm Radio input signal AM modulation frequency : 400Hz Modulation factor : 30% FM modulation frequency : 400Hz Frequency disp

4、lacement : 22.5kHz Frequency Range AM531kHz1710kHz FM87.5MHz108MHz Standard measurement positions of volume and switch Power : Standby (Light STANDBY Indicator) S,A,BASS : OFF Sound mode : OFF Main VOL. : 0 Minimum Travers mecha set position : Disc 1 Mic MIX VOL : MAX ECHO : OFF Precautions for meas

5、urement 1. Apply 30pF and 33kohm to the IF sweeper output side and 0.082 F and 100kohm in series to the sweeper input side. 2. The IF sweeper output level should be made as low as possible within the adjustable range. 3. Since the IF sweeper is a fixed device, there is no need to adjust this sweeper

6、. 4. Since a ceramic oscillator is used, there is no need to perform any MPX adjustment. 5. Since a fixed coil is used, there is no need to adjust the FM tracking. 6. The input and output earth systems are separated. In case of simultaneously measuring the voltage in both of the input and output sys

7、tems with an electronic voltmeter for two channels, therefore, the earth should be connected particularly. 7. In the case of BTL connection amplifier, the minus terminal of speaker is not for earthing. Therefore, be sure not to connect any other earth terminal to this terminal. This system is of an

8、OTL system. VT703 : For Head azimuth(10kHz ) 1-19 Arrangement of adjusting positions Items Measurement conditions Measurement method Standard values Adjusting positions Tape recorder section Tuner section Cassette deck mechanism (Front side) Head azimuth screw (Forward side) PB Head (Deck-A) REC/PB

9、Head (Deck-B) Main P.C.B. TUNER P.C.B. Head azimuth screw (Reverse side) Head azimuth screw (Reverse side) Head azimuth screw (Forward side) 1.Playback the test tape VT703 (10KHz) or equivalent. 2.Adjust the head azimuth screw to obtain maximum output and both output of L / R is in 3dB. 3.Put on the

10、 screw lock paint after alignments. 1.Insert the recording tape in deck-B. 2.Starting the recording. 3.Adjust the oscillation frequency to 80KHz+/-3KHz by core of Oscillation coil of L301. Test tape : VT703 (10kHz) Measurement output terminal : Left and Right speaker output (6-ohm loaded) or Headpho

11、ne Output (32-ohm loaded) Test tape : TYPE AC-514 Measurement output terminal : Erase head terminal (CN308 8-Pin) Maximum output 80kHz+/-3kHz Adjust the head azimuth screw only when the head has been changed. Use the High- Impedance Probe for Frequency counter input. Cassette Head Azimuth Alignments

12、 Recording Bias Frequency Alignment Items Measurement conditions Measurement method Standard values Adjusting positions 1.Set the Signal Generator signal to 530KHz (529KHz) the feed to Loop Antenna. 2.Receiving the signal and the adjust the OSC coil (L2) obtain the V.T is 1.40V +/-0.05V. 3.Change th

13、e receiving frequency to 600KHz (603KHz). 4.Adjust the Antenna coil ( L2 ) obtain maximum sensitivity. (Adjust the SSG output to out of AGC range.) 1.Set the receiving frequency to 530KHz (529KHz ) 2.Feed the 450KHz signal to AM antenna input. 3.Adjust the IFT Block T1 obtain to maximum output. (Adj

14、ust the SSG output to out of AGC range.) Input signal : 530kHz (529kHz) 600kHz (603kHz) Adjustment point : Antenna coil (L2) Input signal : 530kHz (529kHz) Adjustment point : IFT (T1) V .T : 1.40V+/-0.05V Maximum sensitivity Maximum output Adjust the OSC coil only when the AM coil block has been cha

15、nged. Adjust the IFT only when the IFT block has been changed. AM Tracking Alignments AM IFT Alignments Note: The adjustment of CD section is not required. L301L301L301 8-Pin8-Pin8-Pin CN308CN308CN308 L2L2L2 T1T1T1 1-20 Flow of functional operation until TOC read Slider turns REST SW ON. Automatic t

16、uning of TE offset Laser ON Detection of disc Automatic measurement of Focus S-curve amplitude Automatic tuning of Focus offset Disc is rotated Focus servo ON (Tracking servo ON) Automatic tuning of Tracking error balance Automatic measurement of Tracking error amplitude Automatic tuning of Focus er

17、ror balance Disc to be braked to stop Tracking servo on states Tracking servo off states Disc states to rotate TOC reading finishes Automatic measurement of TE amplitude and automatic tuning of TE balance 500mv/div 2ms/divFig.1 Approx.3sec pin 20 of IC611(TE) Approx 1.8V VREF Tracking error waveform

18、 at TOC reading Power ON Play Key Confirm that the Focus error S-cuve signal at the pin32 of IC601 is approx.2Vp-p Confirm that the signal from pin24 IC601 is 0V as a accelerated pulse during approx.400ms. Confirm the waveform of the Tracking error signal. at the pin 20 of IC611 (R643) (See fig-1) A

19、utomatic tuning of Focus error gain Automatic tuning of Tracking error gain TOC reading Play a disc Confirm the eys-pattern at the lead of TP3 Confirm that the voltage at the pin5 of CN602 is HLH. Check Point Check that the voltage at the pin40 of IC601 is + 5V? 1-21 Turn off the power switch and,di

20、sconnect the power cord from the AC OUTLET. Replace the pickup with a normal one.(Refer to Pickup Removal on the previous page) Plug the power cord in,and turn the power on. At this time,check that the laser emits for about 3seconds and the objective lens moves up and down. Note: Do not observe the

21、laser beam directly. Play a disc. Check the eye-pattern at TP3. Finish. Maintenance of laser pickup (1) Cleaning the pick up lens Before you replace the pick up, please try to clean the lens with a alcohol soaked cotton swab. (2) Life of the laser diode When the life of the laser diode has expired,

22、the following symptoms will appear. 1. The level of RF output (EFM output:ampli tude of eye pattern) will below. Is the level of RFOUT under 1.25V 0.22Vp-p? Replace it. NO YES O.K (3) Semi-fixed resistor on the APC PC board The semi-fixed resistor on the APC printed circuit board which is attached t

23、o the pickup is used to adjust the laser power.Since this adjustment should be performed to match the characteristics of the whole optical block, do not touch the semi-fixed resistor. If the laser power is lower than the specified value,the laser diode is almost worn out, and the laser pickup should

24、 be replaced. If the semi-fixed resistor would be adjusted when the pickup operates normally,the laser pickup may be damaged due to excessive current. Replacement of laser pickup 1-22 AN22000A (IC611) : CD-DA Head Amp. 1. Terminal layout 3. Block diagram 2. Pin function Description of major ICs 1 16

25、17 RF_EQ NRFDET AMP AGC 6 24 7548 BDO SUBT 1112 OFTR 3TENV VDET 1314 9 10 15 32 31 22 23 GCABCA AMP 30 29 GCABCA + - AMP SUBT 27 28 21 20 19 18 GCABCA AMP 17 GCABCA + - 2 1 + - - + RFOUT RFIN GCTL 26 TBAL 25163 FBAL LD PD Pin No. Function Symbol I/O Pin No. Function Symbol I/O 1PDIAPC Amp. input ter

26、minal 2LDOAPC Amp. output terminal 3VCC-Power supply terminal 4RFNIRF adder Amp. inverting input terminal 5RFOUTORF adder Amp. output terminal 6RFINIAGC input terminal 7CAGCIInput terminal for AGC loop filter capacitor 8ARFOAGC output terminal 9CBAICapacitor connecting terminal for HPF-Amp. 103TOUTO

27、3 TENV output terminal 11 CBOO I Capacitor connecting terminal for envelope detection on the darkness side 12BDOOBDO output terminal 13COFTRICapacitor connecting terminal for envelope detection on the light side 14OFTROOFTR output terminal 15NRFDETONRFDET output terminal 16GND-Ground 17VREFOVREF out

28、put terminal 18VDETOVDET output terminal 19TEBPFIVDET output terminal 20TEOUTOTE Amp. output terminal 21TENITE Amp. inverting input terminal 22FENIFE Amp. inverting input terminal 23FEOUTOFE Amp. output terminal 24GCTLOGCTL & APC terminal 25FBALOFBAL control terminal 26TBALOTBAL control terminal 27E

29、ITracking signal input terminal 1 28FITracking signal input terminal 2 29DIFocus signal input terminal 4 30BIFocus signal input terminal 3 31CIFocus signal input terminal 2 32AIFocus signal input terminal 1 32 1-23 BA15218DIP (IC102) : Dual low noise operational amp. 1. Terminal layout Pin No.Symbol

30、 Function I/O Pin No.Symbol Function I/O 2. Pin function BA5936S (IC621) : 6 channel BTL driver 1. Block diagram -+ +- OUT1 - IN1 +IN1 VEE Vcc OUT2 - IN2 +IN2 32 12345678910111213141516 31 LEVEL SHIFT MUTE T.S.D 27262524232221 D x2 30 D x2 29 x3/8 28 x3/8 20 LEVEL SHIFT D 19 LEVEL SHIFT D 1817 DD BI

31、AS BIAS Vcc100 13.3k +- BIAS 100 13.3k +- LEVEL SHIFT DETECTION OF REG-OUT CURRENT x2x2 x3/8x3/8 LEVEL SHIFT D LEVEL SHIFT DDDDD BIAS VccVcc 100 13.3k -+ BIAS 100 13.3k 10k 10k -+- 1OUT1-OCH1 negative output 2OUT1+OCH1 positive output 3OUT2-OCH2 negative output 4OUT2+OCH2 positive output 5IN2ICH2 in

32、put 6IN1ICH1 input 7VCC-Power supply terminal 8VCC-Power supply terminal 9REG-IIRegulator current detection terminal 10REG-BOConnect to base terminal of external transistor 11REG-OUTOConstant voltage output (Connect to collector terminal of external transistor) 12IN3-RICH3 reverse input 13IN3-FICH3f

33、orward input 14OUT3+OCH3 positive output 15OUT3-OCH3 negative output 16GND-Ground 17OUT4-OCH4 negative output 18OUT4+OCH4 positive output 19OUT5-OCH5 negative output 20OUT5+OCH5 positive output 21IN5ICH5 input 22IN4ICH4 input 23VCC-Power supply terminal 24BIAS INIBias input terminal 25GND-Ground 26G

34、ND-Ground 27MUTE INIMute input terminal 28IN6-RICH6 reverse input 29IN6-FICH6 forward input 30OUT6+OCH6 positive output 31OUT6-OCH6 negative output 32GND-Ground 1-24 Pin No.Symbol Function I/O Pin No.Symbol Function I/O 2. Pin function LA1823DIP (IC1) : 1chip AM/FM, MPX tuner system 1. Block diagram

35、 1AM_RFINIAMRF signal input 2REG.- 3AM_OSC-AM local oscillation circuit 4VCC_1-Power supply terminal 5FM_MIXOUTOOutput terminal for FM mixer 6GND_1-Ground 7IF_BUFFEROIF buffer output 8ST_INDOStereo indicator output 9AM_MIXOUTOOutput terminal for AM mixer 10FM_IF INIInput of FMIF signal 11AM_IF INIIn

36、put of AMIF signal 12AGCIAGC voltage input terminal 13FM_DETOFM detection signal output 14ST/MON_SWIStereo/Monaural switching signal input 15AM/FM_SWIAM/FM switching signal input 16L_OUTOOutput L-channel 17R_OUTOOutput R-channel 18MPX_INIMultiplex signal input 19DET_OUTOAM/FM detection output 20FM_O

37、SC-FM local oscillation circuit 21VCC_2-Power supply terminal 22FM_RFOUTOOutput of FMRF signal 23GND_2-Ground 24FM_RFINIInput of FMRF signal 24 FM RF FM OSC 23 GND2 21 VCC2 20 FM MIX PHASE COMP 15 PILOT DET 14 FM DET 131918 MUTE 1716 DECODER 22 124510111267893 ST SW FM S-METER AM DET VCOFFFF TRIG ST

38、SD FF AGC FM IF AM IF AM RF REGVCC1GND1 AM MIX AM OSC OSC BUFFER IF BUFFER 1-25 LC72136N (IC2) : PLL Frequency synthesizer 1.Terminal layout 1 2 3 4 5 6 7 8 9 10 11 22 21 20 19 18 17 16 15 14 13 12 XTI FM CE DI CLOCK DO VCOSTOP AM/FM LW MW SDIN XT GND LPFI LPFO PD VCC FMIN AMIN NC IFCNT IFIN Pin No.

39、 1 2 3 4 5 6 7 8 9 10 11 Pin No. 12 13 14 15 16 17 18 19 20 21 22 Symbol XTI FM CE DI CLOCK DO VCOSTOP AM/FM NC NC SDIN Symbol IFIN IFCNT NC AMIN FMIN VCC PD LPFO LPFI GND XT Function Xtal oscillator connect (75KHz) LOW:FM mode When data output/input for 4pin(input) and 6pin(output): H Input for rec

40、eive the serial data from controller Sync signal input use Data output for Controller Output port Low: MW mode Open state after the power on reset Input/output port Input/output port Data input/output Function IF counter signal input IF signal output Not use AM Local OSC signal output FM Local OSC s

41、ignal input Power supply(VDD=4.5 5.5V) When power ON:Reset circuit move PLL charge pump output(H: Local OSC frequency Height than Reference frequency. L: Low Agreement: Height impedance) Output for active lowpassfilter of PLL Input for active lowpassfilter of PLL Connected to GND Xtal oscillator(75K

42、Hz) I/O I O I I I O O O - - I/O I/O I O - I I - O O I - I Reference Driver Phase Detector Charge Pump Unlock Detector Universal Counter Swallow Counter 1/16,1/17 4bit 12bit Programmable DriverS Swallow Counter 1/16,1/17 4bit Data Shift Register & Latch Power on Reset C2B I/F 1/2 7821113 21 17 6 5 4

43、3 15 16 22 1 18 19 20 12 2. Block diagram 3. Pin function 1-26 Pin No.Symbol Function I/O Pin No.Symbol Function I/O 3. Pin function TA8189N (IC401) : REC/PB amp. 1. Terminal layout2. Block diagram 1CH1_AIInput for playback amp. (Ch1): A cassette (PB) 2CH1_BIInput for playback amp. (Ch1): B cassette

44、 (REC/PB) 3NF1INF terminal for playback amp. 4EQ1OMetal output for playback amp. 5PREOUT1OOutput terminal for playback amp. 6MIX_OUTOMixing output 7GND1-Ground 8EQSWIMetal/Normal mode select switch 9REC_OUT1OOutput for recording amp. 10REC_NF1INF terminal for recording amp. 11REC_IN1IInput for recor

45、ding amp. 12GND1-Ground terminal 13ALCIALC filter terminal 14REC_IN2IInput for recording amp. 15REC_NF2INF terminal for recording amp. 16REC_OUT2OOutput for recording amp. 17CGOCharge detection terminal 18VCC-Power supply terminal 19A/B_SWIREC amp. Select switch (A cassette/B cassette) 20PREOUT2OOut

46、put terminal for playback amp. 21EQ2OMetal output for playback amp. 22NF2INF terminal for playback amp. 23CH2_BIInput for playback amp. (Ch2): B cassette (REC/PB) 24CH2_AIInput for playback amp. (Ch2): A cassette (PB) 1 2 3 4 5 6 7 8 9 10 11 12 CH1_A CH1_B NF1 EQ1 PREOUT1 MIX_OUT GND1 EQSW REC_OUT1

47、REC_NF1 REC_IN1 GND 24 23 22 21 20 19 18 17 16 15 14 13 CH2_A CH2_B NF2 EQ2 PREOUT2 A/B_SW VCC CG REC_OUT2 REC_NF2 REC_IN2 ALC 22 23CH2_B 24CH2_A 1CH1_A 2CH1_B 202119 A/B M/N ALC Vref1 18 Iref 17 Vref2 - + Ch2 + - Ch1 - + Ch2 + - Ch1 NF2 EQ2 PREOUT2 A/B_SW VCC CG 354678 NF1 EQ1 PREOUT1 MIX_OUT GND1

48、EQSW 16 REC_OUT2 15 14 REC_IN2 13 ALC 12 GND 11 REC_IN1 REC_NF2 9 REC_OUT1 10 REC_NF1 1-27 TC74HC4094AP (IC402) : 8-bit shift and store resister 1. Terminal layout 2. Block diagram 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 ST SI CK Q1 Q2 Q3 Q4 GND VCC OE Q5 Q6 Q7 Q8 QS QS S D LATCH F/F 2 SIDQ Q 3 CK 1

49、ST 15 OE Q S QD F/F SS D QS S LATCH 4 Q1 5 Q2 DQ Q F/F D QS S LATCH 6 Q3 DQ Q F/F D QS S LATCH 7 Q4 DQ Q F/F D QS S LATCH 14 Q5 DQ Q F/F D QS S LATCH 13 Q6 DQ Q F/F D QS S LATCH 12 Q7 DQ Q F/F D QS S LATCH 11 Q8 QS 9 QS 10 1-28 0/30dB 2dB STEP MUXO-LIN(L) VOLUME VOLUME TREBLE TREBLE TRE(L) MUXO-RIN(R)TRE(R) BOUT(L) SPKR ATT LEFT LOUT SCL SDA DGND ROUT I2CBUS DECODER + LATCHES 100K 100K 100