Pioneer-CX3168-tape-cdm 电路图 维修手册.pdf

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1、 ORDER NO. PIONEER CORPORATION 4-1, Meguro 1-chome, Meguro-ku, Tokyo 153-8654, Japan PIONEER ELECTRONICS (USA) INC. P.O. Box 1760, Long Beach, CA 90801-1760, U.S.A. PIONEER EUROPE NV Haven 1087, Keetberglaan 1, 9120 Melsele, Belgium PIONEER ELECTRONICS ASIACENTRE PTE. LTD. 253 Alexandra Road, #04-01

2、, Singapore 159936 PIONEER CORPORATION 2005 CRT3467 CD MECHANISM MODULE(G3) CX-3168 CX-3116 K-ZZU. APR. 2005 Printed in Japan X-3168 : TOYOTA X-3116 : FORD - This service manual describes the operation of the CD mechanism module incorporated in models listed in the table below. - When performing rep

3、airs use this manual together with the specifi c manual for model under repair. ModelService ManualCD Mechanism Module AVIC-XD1057ZF/UC AVIC-XD1557ZF/UC AVIC-XD1957ZF/UC CRT3458CXK7300 DEH-MG2057ZF/XU/UCCRT3480CXK7300 DEX-MG8157ZT/UC DEX-MG8057ZT/XU/UC CRT3486CXK7310 DEH-MG8257ZT/UCCRT3487CXK7310 CO

4、NTENTS 1. CIRCUIT OVER VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2. MECHANISM OVER VIEW . . . . . . . . . . . . . . . . . . . . . . 23 3. DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 4. HOW TO ASSEMBLE . . . . . . . . . . . . . . . . . . . . . . . .

5、 . . 45 RadioFans.CN 收音机爱 好者资料库 CX-31682 1234 1234 C D F A B E 1. CIRCUIT OVER VIEW Fig.1 UPD63763AGJ(X-3168),UPD63761AGJ(X-3116) block diagram A-F UPD63763AGJ, UPD63761AGJ Audio output SDRAM 16Mbit Microcomputer Digital servo RF amp CD-ROM decoder EFM Signal processing Built-in SRAM (1M bit) Buffer

6、 memory controller (BMC) MP3/WMA decoder DAC Concerning CD LSI, beside the core DSP, LSI which unifies DAC once used as peripheral circuit or RF amp is the mainstream, and UPD63763AGJ,UPD63761AGJ is a multifunction LSI which has a plenty of functions such as existing CD and replay CD-ROM storing MP3

7、/WMA file by embedding CD-ROM decoder or MP3/WMA decoder. *X-3116 has built-in WMA decoder by each LSI function, but is not corresponded to its specification. RadioFans.CN 收音机爱 好者资料库 CX-31683 5678 56 7 8 C D F A B E 1.1 PREAMP SECTION 1.1.1 APC circuit (Automatic Power Control) Fig.2 APC PU unitCD c

8、ore unit MD VR LD- LD+ 11 13 10 9 11 13 10 9 1000P CTF1389 0.1F 15/3R3 2SB1132 2R4 x 22R7 + + - + - + - PD VREF REG 1.25V APN LDS UPD63763AGJ, UPD63761AGJ LD 143 142 6R5K 1K 6R5K 1K 110K 100K 100K 3P The preamp section is processing pick-up output signal and generating signal to servo section, demod

9、ulator section and control section of the next stage. The signal from pick-up is I-V converted by photodetector-built-in preamp in the pick-up, then added by RF amp and created RF, FE, TE, TE empty cross signal. This preamp section is embedded in CD LSI UPD63763AGJ,UPD63761AGJ (IC201), and each sect

10、ion of it is explained below. Since the spec of this LSI is single power supply (+3.3V), reference voltage of this LSI and pick-up should be all REFO (1.65V). REFO is the output from REFOUT in the LSI through buffer amp, and its output comes from the number 133 pin of the LSI. All measurement is bas

11、ed on the REFO. NOTE: Never short-circuit REFO and GND. Since light output has large minus temperature characteristics when laser diode is operated under constant current, it is necessary to control current by monitor diode so that constant output is maintained. This is APC circuit. LD current is ge

12、nerated by measuring current between LD1 and V3 R3 and dividing the value by 7.5 , and its current value should be about 30mA. RadioFans.CN 收音机爱 好者资料库 CX-31684 1234 1234 C D F A B E 1.1.3 Focus error amp 1.1.4 RFOK circuit 1.1.5 Tracking error amp Fig.3 TE P5 VERF E 11 F E F 9 11 9 P6 P1 P10 130 112

13、K 160K 129 112K 160K160K 63K 80K 181K 45R36K 45R36K + - 63K + - + - VREF TEOFF setting TE A/D + - + - + - + - 60K 20K Internal TEC 139 TEO 138 TE- 140 TE2 141 TEC 47P 68P CD core unit PU unit UPD63763AGJ, UPD63761AGJ The photodetector output (A+C), (B+D) comes from the number 91 pin as FE signal whi

14、ch is (A+C-B-D) through differential amp and then error amp. The low frequency of voltage FE is showed in the following formula. FE=(A+C-B-D) X 8.8k / 10k X 111k / 61k X 160k / 64k =(A+C-B-D) X 4 The FE output generates 1.5Vpp of S curve based on REFO. The cut-off frequency of the amp in back stage

15、is 14.6kHz. This circuit is signal expressing timing of focus-close and focus-close condition during playing, and output from the number 55 pin as RFOK signal output. During playing at focus-close, H is output as signal. Since RFOK signal holds a peak of DC level of RFAGCI at digital section in back

16、 stage and is converted and generated by certain threshold level, RFOK is H without a bit. Therefore, focus-close is also performed in disc mirror surface. This signal is supplied to a microcomputer via LPF as FOK signal and used for protection and switching gain of RF amp. The photodetector output

17、E, F comes from the number 139 pin, taking (E-F) as TE signal through a differential amp and then an error amp. The low frequency of TE is showed in the following formula. TEO=(E-F) X 63k / 112k X 160k / 160k X 181k / 45.4k X 160k / 80k = (E-F) X 4.48 TE output generates 1.15Vpp level TE waveform ba

18、sed on REFO. The cut-off frequency of the amp in back stage is 21.1kHz. CX-31685 5678 56 7 8 C D F A B E 1.1.6 Tracking empty cross amp 1.1.7 EFM circuit Fig.4 EFM 114 2K 100K 40K 40K VDD VDD + - + - + - RFI UPD63763AGJ, UPD63761AGJ EFM signal 111 EFM 112 ASY The tracking empty cross signal (hereaft

19、er, TEC signal) is the signal amplifying TE signal for 4 times and used to find an empty cross point of tracking error. The purpose for finding the empty cross point is; 1 To use for track count at carriage movement and track jump 2 To use for detecting direction of lens movement at tracking close (

20、used in a tracking brake circuit described later) The frequency range of TEC signal is 300 Hz - 20kHz, and voltage TEC=TE level X 4. That is, TEC level is 4.62V as calculated, and this level is over D range of an operation amp and so that the signal is clipped, but only empty cross point is used in

21、CD LSI, so there is no problem. EFM circuit is the circuit for converting RF signal into 0 1 digital signal. AGCO signal output from the number 116 pin is AC-combined, input to the number 114 pin, and supplied to EFM circuit. Since RF vertical asymmetry occurred because of the lack of RF signal by a

22、 scratch or dirt on a disc, and quality variation of disc production is not deleted only by AC-combination, reference voltage ASY of EFM comparator is controlled, taking advantage of the fact that the occurring rate of 0 1 in EFM signal is 50%. In this way, the comparator level is always around the

23、center of RFO signal. This reference voltage ASY is generated with passing EFM comparator output through LPF. EFM signal is output from the number 111 pin. CX-31686 1234 1234 C D F A B E 1.2 SERVO SECTION (UPD63763AGJ,UPD63761AGJ: IC 201) 1) Focus servo system FE AMP DIG. EQ 125 A+C B+D FD FO+ FO- I

24、C302 BD7962FM LENS IC201 UPD63763AGJ,UPD63761AGJ 128 101 18 17 FOCUS SEARCH TRIANGULAR WAVE GENERATOR DACCONTROL A/D R218 10K R311 C219 1000pF 8R2K R313 27K C302 150P 10 11 Fig.5 Focus servo block diagram The servo section operates servo control such as equalizing of error signal, in-focus, track ju

25、mp, carriage move, etc. DSP is section for signal processing and operates data decoding, error correction, interpolation processing, etc. FE, TE signal generated in preamp stage is A/D converted and outputs drive signal of focus, tracking, and carriage system via servo block. And EFM signal is decod

26、ed in the signal processing section and outputs audio signal after D/A convert via D/A converter finally. In addition, in this decoding process, error signal of a spindle servo is generated, and supplied to the spindle servo section, and outputs drive signal for the spindle. Each drive signal of foc

27、us, tracking, carriage and spindle is amplified by the driver IC BD7962FM (IC302) after that and supplied to each actuator and motor. The main equalizer of focus servo is made up of digital equalizer section. The fig 10 shows a block diagram of focus servo. In the focus servo system, it is necessary

28、 to bring a lens within in-focus range to focus-close. In order to do that, triangle wave of focus search voltage moves a lens up and down to find in-focus point. During that time, a spindle motor is kicked to maintain rotation at the fixed speed. The servo LSI monitors FE signal 1 A lens is moving

29、from away to near toward a disc. 2 RFOK= H 3 Just at the moment when FZC signal is once over the threshold of FZD register and latched to H again (the edge of FDZ). As the result, FE converges 0 (=REFO). CX-31687 5678 56 7 8 C D F A B E REFO FD Relative lens position toward a disc NEAR FAR Level of

30、focusing time MD REFO Zoom-in of focusing point REFO RFI FOK FE FZD threshold level FZD (internal signal) Usually, focus-close occurs at these points. XSI (focus is closed) Fig.6 Focus-close sequence When the conditions described above are set and focus- close is performed, XSI terminal becomes H -

31、L and after 40ms, the microcomputer starts to monitor RFOK signal through LPF. When RFOK signal is detected as L, the microcomputer takes a various action such as protection. Fig 11 shows a series of action concerning focus-close (this figure shows a case when focus-close is impossible). If pressing

32、 focus-close button in condition that a select of focus mode is display 01 in the test mode, it is possible to check S curve, search voltage and actual lens operation. CX-31688 1234 1234 C D F A B E The main equalizer of tracking servo is made up of digital equalizer section. A block diagram of trac

33、king servo is showed in Fig 12. 2) Tracking servo system a) Track jump TE AMP DIG. EQ 129 F E TD TO- TO+ IC302 BD7962FM LENS IC201 UPD63763AGJ,UPD63761AGJ 130 103 16 15 JUMP PARAMETERS DACCONTROL A/D t1 t2 GAIN NORMAL TD KICK BRAKE TEC T. BRAKE EQUALIZER T. SERVO CLOSED OPEN NORMAL GAIN UP OFF ON Fi

34、g.7 Tracking servo block diagram Fig.8 Single track jump Fig.9-1 Multi-track jump R214 10K R312 C215 1500pF 8R2K R314 18K C301 220P 13 12 Track jump is performed automatically by the command of the microcomputer according to the auto-sequence function inside LSI. In this system, up to 100 tracks of

35、multi-jump is prepared for using as track jump at the search time. In the test mode, 1, 4, 10, 32, 32 X 3 jump of it and carriage move can be checked by mode selection. For jumps up to 4 tracks, about half number of total jumps (e.g., about 2 tracks are set for 4 tracks) are set by microcomputer. Th

36、e speed control (which counts the length of TEC interval and controls TD so as to keep a constant frequency) is conducted for any jump up to 5-100 tracks and a target number of total tracks is set by microcomputer. The established number of tracks is counted by using TEC signal. From the moment when

37、 the set number is counted, brake pulse is output for defined period of time, and a lens is stopped. In this way, it is possible to close tracking and continue normal play. In addition, gain up of a tracking servo in the brake circuit ON is performed for 50ms after stopping brake pulse in order to i

38、ncrease lead-in of servo during track jump. FF/REW operation in normal mode is carried out with executing a single jump continuously. The speed is varied according to place of destination and is about 10 or 20 times of normal mode. TD t1 t2 TEC EQUALIZER T.BRAKE SERVO 50ms GAIN UP NORMAL ON OFF OPEN

39、 CLOSED CX-31689 5678 56 7 8 C D F A B E b) Brake circuit TEC TZC (TEC becomes pulse) (Internal signal) MIRR MIRR is latched by the edge of TZC pulse. = SWITCHING PULSE EQUALIZER OUTPUT (SWITCHED) DRIVE DIRECTION (NOTES) The phase of equalizer output is written as the same as TEC phase. FORWARD Lens

40、 moving forward (from inner side to outer side) Lens moving backward Time REVERSE Fig.10 Tracking brake circuit Since lead-in of servo is weakened during set-up or track jump, stable lead-in to servo loop is performed, using a brake circuit. The brake circuit detects the direction of a lens and outp

41、uts only the drive signal of the cross direction toward its operation to slow the lens speed down and performs stable lead-in to the tracking servo. In addition, the direction for sliding a track is determined by TEC signal, MIRR signal and its phase relation. Fig.9-2 Multi-track jump(Speed control)

42、 TD TEC EQUALIZER T.BRAKE SERVO SD 50ms CX-316810 1234 1234 C D F A B E COM COP IC302 BD7962FM CARRIAGE MOTOR 19 20 M R321 27K R319 39K C306 4R7P 33 32 3) Carriage servo system DIG. EQ SD IC201 UPD63763AGJ,UPD63761AGJ 105 KICK, BRAKE REGISTERS DACCONTROL FROM TRACK. EQ DRIVE ON/OFF THRESHOL D Carria

43、ge is moved by these points. TRACKING DRIVE (LOW FREQUENCY) LENS POSITION CRG DRIVE (INSIDE UPD63711GC) CRG MOTOR VOLTAGE Fig.11 Carriage servo block diagramFig 16: Carriage servo block diagram Fig.12 Carriage signal waveform The carriage servo is input the output from low frequency number composite

44、 of tracking equalizer (position information of lens) to carriage equalizer, and after acquiring fixed gain, it outputs drive signal from LSI. The signal is impressed to carriage motor via driver IC. To be more precise, since it is necessary to move the entire pick-up to forward direction when lens

45、off-set during playing reaches to certain level, the gain of equalizer is set to generate higher voltage than start-up voltage of carriage motor at that time. In addition, actual operation is set to fix a certain threshold for equalizer output inside servo LSI, and to output the drive voltage only w

46、hen the level of equalizer output is over that fixed level. In that way, power consumption is reduced. Moreover, according to decentering of a disc, the level of equalizer output voltage may cross threshold level several times before the entire pick-up starts to move. At that time, output waveform o

47、f drive voltage from LSI is pulse state. CX-316811 5678 56 7 8 C D F A B E 4) Spindle servo system DSP BLOCK DIG. EQ MD A3 A1 IC301 BA6859AFP SPINDLE MOTOR IC201 UPD63763AGJ,UPD63761AGJ 107 20 4 6 DAC EFM SIGNAL M SPEED ERROR SIGNAL PHASE ERROR SIGNAL R322 18K 27 26 R320 33K C307 0.01 EC IC302 BD796

48、2FM ECR SPCONT FG 5 A2 19 21 22 Fig.13 Spindle servo block diagram There are following modes for spindle servo. 1 Simple FG servo: It is for maintaining the rotation of a disc to be in closer condition of regular rotation. The microcomputer monitors FG signal output pulse according to the rotation o

49、f a spindle motor and controls the drive voltage of the spindle motor. This is used in following situation. a) At set-up time, it is used during transition from power ON with focus-close to rough servo. b) It is used until recovering from out-of-focus during playing. 2 Adaptation servo: It is CLV servo mode of normal operation. It takes a sample of WFCK/16 at EFM demodulation block to check whether frame synchronized signal and internal frame counter output agree, then generates signal showing agree or disagree. When this sig