SONY MZ-G755 维修电路图.pdf

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1、1 SERVICE MANUAL FM/AM PORTABLE MINIDISC RECORDER Model Name Using Similar MechanismMZ-G750/R700 Mechanism TypeMT-MZR700-172 Optical Pick-up NameLCX-4R MD recorder Audio playing system MiniDisc digital audio system Laser diode properties Material: GaAlAs MQW Wavelength: = 790 nm Emission duration: c

2、ontinuous Laser output: less than 44.6 W (This output is the value measured at a distance of 200 mm from the lens surface on the optical pick-up block with 7 mm aperture.) Recording and playback time When using MDW-80 Maximum 160 min. in monaural Maximum 320 min. in stereo Revolutions 350 rpm to 2,8

3、00 rpm (CLV) Error correction ACIRC (Advanced Cross Interleave Reed Solomon Code) Sampling frequency 44.1 kHz Sampling rate converter Input: 32 kHz/44.1 kHz/48 kHz Coding ATRAC (Adaptive TRansform Acoustic Coding) ATRAC3-LP2 ATRAC3-LP4 SPECIFICATIONS Modulation system EFM (Eight to Fourteen Modulati

4、on) Number of channels 2 stereo channels 1 monaural channel Frequency response 20 to 20,000 Hz 3 dB Wow and Flutter Below measurable limit Inputs Microphone: stereo mini-jack, minimum input level 0.35 mV Line in: stereo mini-jack, minimum input level 49 mV Optical (Digital) in: optical (digital) min

5、i- jack Outputs i: stereo mini-jack, maximum output level 5 mW + 5 mW, load impedance 16 ohm Radio Frequency range AM: 531-1,602 kHz FM: 87.5-108.0 MHz General Power requirements Sony AC Power Adaptor (supplied*) connected at the DC IN 3 V jack: 230 V AC, 50/60 Hz (AEP, FR, CET model) 240 V AC, 50 H

6、z (Australian model) 230-240 V AC, 50 Hz (UK, HK model) 110/220 V AC, 60 Hz (Korean model) 100-240 V AC, 50/60 Hz (E, JE model) Nickel cadmium rechargeable battery NC-WMAA (supplied) LR6 (size AA) alkaline battery (not supplied) *) Except for Korean model Abbreviation FR: French model CET : East Eur

7、opean battery case assy qsbattery coil spring qdMAIN board qaRemove the solder. 4screws (M1.7x3) 5screws (M1.4x2) 1CN502 2arm 8CN501 9 MZ-G755 3-7. HOLDER ASSY 3Remove the holder assy to direction of the arrow B. 1Open the holder assy. A 2 B boss 3-6. OP SERVICE ASSY 4rack spring (s) 6thrust detent

8、spring 3precision pan screw (M1.4) 5precision pan screw (M1.4) 1washer (0.8 - 2.5) 2gear (SA) 8Pull off the lead screw. 7 B A 9Opening the over write head toward the direction A, remove the OP service assy toward the direction B. Note: Do not open the entire assy forcibly, when opening the over writ

9、e head. over write head section 10 MZ-G755 4two precision pan screws (M1.4) 5DC moter (sled) (M602) 3Remove four solders of motor flexible board. 1washer (0.8 - 2.5) 2gear (SA) 3-9. DC MOTOR (M602) 2Remove two solders of DC motor (over write head up/down) (M603). 1Remove four solders of DC motor (sl

10、ed) (M602). 3Remove four solders of DC motor (spindle) (M601). DC motor (sled) circular hole 5motor flexible board 4adhesive sheet Note: Align a circular hole in the stripping paper with a circular hole in the DC motor (sled), when mounting the motor flexible board. 3-8. MOTOR FLEXIBLE BOARD 11 MZ-G

11、755 1Remove six solders of motor flexible board. 4three precision pan screws (M1.4) qsDC moter (over write head up/down) (M603) 6two precision pan screws (M1.4) qagear chassis assy 0screw (M1.2 1.5) 9gear (HA) 8gear (HB) 7washer (0.8 - 2.5) 2washer (0.8 - 2.5) 3gear (HC) 5DC moter (spindle) (M601) D

12、C motor (over write head up/down) (M603) gear chassis assy gear (HA) 2.65 mm Note: Press-fit the gear (HA) up to the position of the DC motor (over write head up/down) (M603) as shown below. 3-10. DC MOTOR (M601), DC MOTOR (M603) 12 MZ-G755 2 In the normal mode, turn on the HOLD switch. While press-

13、 ing the VOL - key press the following order: tt.t.tt .t t.tXtX SECTION 4 TEST MODE 4-3. Operation in Setting the Test Mode When the test mode becomes active, first the display check mode is selected. Other mode can be selected from the display check mode. When the test mode is set, the LCD repeats

14、the following dis- play. When theXkey is pressed and hold down, the display at that time is held so that display can be checked. Caution: On the set having the microcomputer version 1.000, some adjusted values were set in the manual mode at the shipment, but these data will be cleared when the NV is

15、 reset. Therefore, on the set having the micro- computer version 1.000, change the adjusted values following the Change of Adjusted Values immediately after the NV was reset (see page 18). 4-4. Releasing the Test Mode For test mode set with the method 1: Turn off the power and open the solder bridge

16、 on SL801 (TEST) on the MAIN board. Note: Remove the solders completely. Remaining could be shorted with the chassis, etc. For test mode set with the method 2: Turn off the power. Note: If electrical adjustment (see page 18) has not been finished completely, always start in the test mode. (The set c

17、annot start in normal mode) 4-1. Outline This set provides the Overall adjustment mode that allows CD (PB) and MO (REC/PB) disk to be automatically adjusted when in the test mode. In this overall adjustment mode, the disc is discriminate between CD and MO, and each adjustment is automatically execut

18、ed in order. If a fault is found, the system displays its location. Also, the manual mode allows each individual adjustment to be automatically adjusted. Operation in the test mode is performed with the set. A key having no particular description in the text, indicates a set key. For the LCD display

19、, the LCD on the set is shown. 4-2. Setting Method of Test Mode There are two different methods to set the test mode: 1 Short SL801 (TEST) on the MAIN board with a solder bridge (connect pin 3 of IC801 to the ground). Then, turn on the power. MAIN BOARD (SIDE B) C821 C815 X801 SL801 (TEST) C809 R817

20、 C807C808R806 C814 FB801 AP817 AP828 BASS All lit This set LCD display SYNCMONOLP24REC RECDATEREMAIN 1 SHUFF PGM AM PM F e88:88 00 5 All off Microcomputer version display Ver 1.300 13 MZ-G755 4-5. Configuration of Test Mode 4-6. Manual Mode Mode to adjust or check the operation of the set by functio

21、n. Normally, the adjustment in this mode is not executed. However, the Manual mode is used to clear the memory, power supply adjustment, and laser power check before performing automatic adjustments in the Overall Adjustment mode. Transition method in manual mode 1.Setting the test mode (see page 12

22、). 2.Press the or VOL + key activates the manual mode where the LCD display as shown below. 3.During each test, the optical pick-up moves outward or in- ward while theNor.key is pressed for several sec- onds respectively. 4.Each test item is assigned with a 3-digit item number; 100th place is a majo

23、r item, 10th place is a medium item, and unit place is a minor item. The values adjusted in the test mode are written to the nonvolatile memory (for the items where adjustment was made). Press the or VOL + key. Press the x key. Press the x key. Press the x key. Press the x key. Press the N or REC ke

24、y. The key check quits, or open the upper panel. Press the T MARK or ENTER key for several seconds (about 3 seconds). ENTER key Test Mode (Display Check Mode) Servo Adjustment Manual Mode Key Check Mode Audio Adjustment Power Supply Adjustment OP Alignment Adjustment Press the . or VOL key. Electric

25、al Offset Adjustment Overall Adjustment Mode Sound Skip Check Result Display Mode Self-diagnosis Result Display Mode Power Supply Adjustment Auto Item Feed CD Overall Adjustment/ MO Overall Adjustment 00 0Manual This set LCD display x key N key x key N key Major Item Switching Minor Item Switching M

26、edium Item Switching . key: Unit Place of item number decrease. VOL key: 10th Place of item number decrease. VOL + key: 10th Place of item number increase. VOL key: Decreases the adjusted value. VOL + key: Increases the adjusted value. VOL key: 100th Place of item number decrease. VOL + key: 100th P

27、lace of item number increase. N key: Unit Place of item number increase. X key: When adjusted value is chaged: Adjusted value is written. When adjusted value is not changed: That item is adjusted automatically. Adjusted Value Variation Adjusted Value Write 14 MZ-G755 4-8. Self-diagnosis Result Displ

28、ay Mode This set uses the self-diagnostic function system in which if an error occurred during the recording or playing, the mechanism control block and the power supply control block in the microcomputer detect it and record its cause as history in the nonvolatile memory. By checking this history i

29、n the test mode, you can analyze a fault and determine its location. Total recording time is recorded as a guideline of how long the optical pick-up has been used, and by comparing it with the total recording time at the time when an error occurred in the self- diagnosis result display mode, you can

30、 determine when the error occurred. Clear both self-diagnosis history data and total recording time, if the optical pick-up was replaced. Self-diagnosis result display mode setting method 1. Setting the test mode (see page 12). 2. In the display check mode, press the ENTER key activates the self-dia

31、gnosis result display mode where the LCD display as shown below. 3. Then, each time thekey is pressed, LCD display descends by one as shown below. Also, the LCD display ascends by one when the.key is pressed. If the ENTER key on set is pressed with this display, the LCD switches to the simple displa

32、y mode. 4. Quit the self-diagnosis result display mode, and press thexkey to return to the test mode (display check mode). 5.The display changes a shown below each time the ENTER key on the set is pressed. However in the power mode (item number 700s), only the item is displayed. 6.Quit the manual mo

33、de, and press thexkey to return to the test mode (display check mode). 4-7. Overall Adjustment Mode Mode to adjust the servo automatically in all items. Normally, automatic adjustment is executed in this mode at the repair. For further information, refer to “Section 5 Electrical Adjustments” (see pa

34、ge 18). This set LCD display item number adjustment value address Address (JX) (PB mode) Approx. 220mVp-p Waveforms 100mV/DIV, 1s/DIV 100V/DIV, 1s/DIV 100mV/DIV, 1s/DIV Approx. 220mVp-p 4 IC501 qa (JY) (PB mode) Approx. 220mVp-p 100mV/DIV, 1s/DIV 5 IC501 1 (TE) (PB mode) Approx. 35mVp-p 20mV/DIV, 50

35、0ns/DIV 6 IC501 ed (RF OUT) (PB mode) 500mV/DIV, 500ns/DIV 7 IC501 rs (FE) (PB mode) 10mV/DIV, 500ns/DIV 8 IC601 4 (CLK) 2.5Vp-p 5.8s 1V/DIV, 2s/DIV 9 IC901 th (CLK) 2.5Vp-p 5.8s 1V/DIV, 2s/DIV Approx. 1.3Vp-p Approx. 20mVp-p Note: The components identi- fied by mark 0 or dotted line with mark 0 are

36、 criti- cal for safety. Replace only with part number specified. Note: Les composants identifis par une marque 0 sont critiques pour la scurit. Ne les remplacer que par une pice portant le numro spcifi. MZ-G755 3737 6-6. SCHEMATIC DIAGRAM MAIN SECTION (1/3) Refer to page 36 for Common Note on Schema

37、tic Diagram and Waveforms, and refer to page 40 for IC Block Diagrams. IC B/D IC B/D IC B/D C561 C557 C558 C559 C512 C607C606 R606 C618 C614 C616 C608 C505 C506 C507 C504 C503 C502 C508 C509 C510 C511 C513 R608 TH601 J601 C601 C529 R521 C524 C523 C530 R602 R603C605 R607 C516 R619 C633 L554 L553 C611

38、 R621 C610 C613 C612 R620 C551 C552 C619 C515 C555 C521 L502 RB552 RB551 Q603 C615 R501 Q602 T601 IC551 RB553 R613C621 L501 R611 R610 R507C501 C519 R517 R505 R519 TPTP C604 C602 R601 L601 CN501 CN502 AP501 AP502 AP503 AP504 AP511 AP517 TP505 C518 AP523AP524 AP532 AP525 AP527 AP535 AP526 SL505 SL506

39、AP528 AP529 AP530 AP531 AP537 AP536 AP522 AP520 TP605 TP604 C514 C603 C631 TP601 TP602 C627TP606 AP903 R624 TP610 TP611 AP570 AP571 AP572 AP573 AP574 AP575 AP576 AP577 AP578 AP579 AP554 AP580 AP581 TP603 C632 C628 C629 C622 C623 C624 L602 AP601 AP606 AP584 AP564 AP565 AP585 AP563 AP555 AP556 AP557 A

40、P558 AP550 AP559 AP560 AP587 AP586 AP553 AP566 AP567 AP568 AP569 AP583 AP551 AP552 AP534 AP533 AP521 C527 TP501 C609 L551 L552 C522 C556 TP512 TP519 TP518 Q501 D601 Q601 D602 C630 D603 R604R605 D605 D606 Q604D608 R609 D607 C553 C554 Q605 IC501 IC601 (Page 38) MZ-G755 3838 6-7. SCHEMATIC DIAGRAM MAIN

41、 SECTION (2/3) Refer to page 36 for Common Note on Schematic Diagram and Waveforms, and refer to page 41 for IC Block Diagrams. IC B/D S806 C816 R823 R806 X801 C911 R830 L905 D903 R903 C905 R902 R822 C814 R809 R817 R808 R829 C920 R911 C801 C823 C908 C907 R910 C812 C813 C914 L904 R807 C802 C804 R824

42、R825 L802 R828 C820C819 C810 C811 C808C807 SL801 S803 R814L801 C818 C822 C805 R801 L901 L902 C806 R909 C921 AP842 AP841 AP840 AP821 AP822 AP823 AP835 AP828 AP829 AP801 AP802 AP803 AP804 AP805 C825 AP848 AP806 AP807 AP808 AP810 AP809 AP814 C821 FB804R831 FB803R816 FB802R815 R834 R839 R836 C830 S805 A

43、P833 AP834 AP815 AP816 AP817 C827 AP832 TP801 R1029 C809 R803 R802 AP843 AP844 AP845 AP820 AP846 AP847 R837 AP901 AP909 AP908 AP902 C924 C912 C910 C909 AP904 C918 R941 C926 AP907AP906 R917 R946 C901 R915 IC901 R947R948 R936 R914 R906 L906 R907 R908 C913 C904 R1030 R804 R805 C803 R840 IC805 R841C828

44、R810 D803 R835 D904 C902 D901 TP901 TP912 D902 C903 TP902 AP910 D1003 R821 C815 C917C915 C922 R812 IC801 IC804 C817 R921 R905C906 C919 FB801 (Page 37) (Page 39) (Page 39) MZ-G755 3939 6-8. SCHEMATIC DIAGRAM MAIN SECTION (3/3) Refer to page 36 for Common Note on Schematic Diagram and refer to page 40

45、 for IC Block Diagrams. IC B/D IC B/D IC B/D IC B/D IC B/D IC B/D IC B/D J301 J303 J302 RB801 R1021 R1019 R1018 IC1004 R1017 C1011 R1016 R1023 C1007 C1010 R1014 C1005C1006 C1004 R1010 R1011 R1007 R1008 R1009 R1042 R1005 C1002 R1006 L1001 L1005 C1009 C1008 L1004 R1022 Q1001 L1002 R1001 C336C331 C334C

46、206 C106 C320 R306 R309 R207 R107 C316 C105 R106 C104C204 C205 R206 C314 R303 FB303 Q801 FB805 AP830 AP831 R1031 R1032 C327 C218 C118 R319 C117 C217 C116 C216 C213C322 C332 R301 C309 C113 C112 C323 C324 R118 R218 R317 R318 R112 R212 C326 C325 C211 C111 C110 C210 L1003 R1047 L303 C317C318 C319 IC1006

47、 C310 R302 C330 R307 D1002 C340C321 R311F801 R305 R304 L301 C307 C335 C302 C306 C202 C102 C1012R1033 C1016 C305 C301 R1026 R1049 TP341 TP342 TP343 TP344 TP345 TP331 TP332 TP333 TP334 TP335 TP336TP338 TP337 TP339 R111R211 C308 TP306 TP307 R104 R204 C201 C101 R202 R102 C312 FB302 FB304 TP311 TP312 TP3

48、13 TP314 TP315 TP316 TP317 C311 R105R205 C826 CN801 R1035 TP1003 IC1005 C1003TP1001 TP1004 TP1002 IC1002 Q1006 D1005 IC301 IC1003 Q1003 D1001 Q1004 Q1002 Q1005 Q1009 R1034 D301 D101 D201 FB301 Q301 C212 IC303 Q302 Q1010 Q1008 R310 R203 R103 C315 IC302 R1039 D1004 Q1007 (Page 38) MZ-G755 4040 6-9. IC

49、 BLOCK DIAGRAMS IC501SN761057ADBT 1TE REXT Wpp LPF VREF C D D-C Iy Ix Jx Jy A A-C B ADIP-IN FE ABCD OFC-1 OFC-2 PS LP EQ AGND RF OUT CCSL2 VC XRST SCK SBUS VREF075 PEAK BOTM DGND OFTRK S-MON TON-C CIG CDN ADIP DVDD PD-I PD-NI PD-O 43 44 TWpp PK/BTM Aw CSLO VREF075 A-C D-C Malfa Mij AwBPF Dw DwBPF 42 39 AVCC38 37 36 35 34 31 30 29 28 27 26 25 24 23 40 41 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1