sony_mz-g750,r700_ver1.0电路原理图 .pdf

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

2、 Emission duration: continuous 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 Revol

3、utions 350 rpm to 2,800 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

4、 to Fourteen Modulation) 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 0.25 mV Line in: stereo mini-jack, minimum input level 49 mV Optical (Digital) in:

5、optical (digital) mini- jack Outputs i: stereo mini-jack, maximum output level 5 mW + 5 mW, load impedance 16 ohm Radio (MZ-G750) 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

6、model) 230-240 V AC, 50 Hz (UK/Hong Kong model) 100-240 V AC, 50/60 Hz (Other models) Nickel cadmium rechargeable battery NC-WMAA (supplied) LR6 (size AA) alkaline battery (not supplied) Continued on next page AEP Model UK Model Tourist Model Hong Kong Model US and foreign patents licensed from Dolb

7、y Laboratories Licensing Corporation. Ver 1.0 2001. 01 MZ-G750 PORTABLE MINIDISC RECORDER MZ-R700 Ver 1.0 2001. 01 Sony Corporation Audio Entertainment Group General Engineering Dept. 9-873-045-11 2001A0400-1 2001. 1 2 Flexible Circuit Board Repairing Keep the temperature of the soldering iron aroun

8、d 270C during repairing. Do not touch the soldering iron on the same conductor of the circuit board (within 3 times). Be careful not to apply force on the conductor when soldering or unsoldering. Notes on chip component replacement Never reuse a disconnected chip component. Notice that the minus sid

9、e of a tantalum capacitor may be damaged by heat. CAUTION Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure. Battery operation time Battery life1) (MZ-G750) When recording2)(Unit: approx.hours) (EIAJ3) BatteriesSt

10、ereoLP2LP4 NC-WMAA Nickel Cadmium467.5 rechargeable battery4) LR6 (SG) Sony alkaline dry96)136)166) battery5) 1)The battery life may be shorter due to operating conditions and the temperature of the location. 2)When you record, use a fully charged rechargeable battery. 3)Measured in accordance with

11、the EIAJ (Electronic Industries Association of Japan) standard. 4)When using a 100% fully charged rechargeable battery. 5)When using a Sony LR6 (SG) “STAMINA” alkaline dry battery (produced in Japan). 6)Recording time may differ according to the alkaline batteries. When playing(Unit: approx.hours) (

12、EIAJ1) BatteriesStereoLP2LP4 NC-WMAA Nickel Cadmium11.51416 rechargeable battery2) LR6 (SG) Sony alkaline dry364248 battery3) 1)Measured in accordance with the EIAJ (Electronic Industries Association of Japan) standard. 2)When using a 100% fully charged rechargeable battery. 3)When using a Sony LR6

13、(SG) “STAMINA” alkaline dry battery (produced in Japan). When using the radio(EIAJ1) BatteriesApprox. hours NC-WMAA Nickel Cadmium rechargeable9.5 battery2) LR6 (SG) Sony alkaline dry battery3)28.5 1)Measured in accordance with the EIAJ (Electronic Industries Association of Japan) standard. 2)When u

14、sing a 100% fully charged rechargeable battery. 3)When using a Sony LR6 (SG) “STAMINA” alkaline dry battery (produced in Japan). Battery life1) (MZ-R700)(Unit: approx.hours) (EIAJ2) BatteriesStereoLP2LP4 NC-WMAA Nickel CadmiumRecording467.5 rechargeable battery3)Playback1314.518 LR6 (SG) Sony alkali

15、ne dryRecording91316 battery4)Playback404653 1)The battery life may be shorter due to operating conditions and the temperature of the location. 2)Measured in accordance with the EIAJ (Electronic Industries Association of Japan) standard. 3)When using a 100% fully charged rechargeable battery. 4)When

16、 using a Sony LR6 (SG) “STAMINA” alkaline dry battery (produced in Japan). Dimensions Approx. 81 74.4 28.1 mm (w/h/d) (3 1/4 3 1 1/8 in.) without projections. Mass Approx. 118 g (4 5/32 oz) the recorder only (MZ-G750) Approx. 116 g (4.1 oz) the recorder only (MZ-R700) Supplied accessories AC power a

17、daptor (1) Headphones/earphones with a remote control (1) Optical cable (1) NC-WMAA nickel cadmium rechargeable battery (1) Rechargeable battery carrying case (1) Carrying pouch/carrying case with a belt clip (except U.S.A model) (1) Design and specifications are subject to change without notice. SA

18、FETY-RELATED COMPONENT WARNING! COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY. M

19、Z-G750/R700 3 1.SERVICING NOTE.4 2.GENERAL Looking at the Controls (MZ-G750).5 Looking at the Controls (MZ-R700).6 3.DISASSEMBLY 3-1. Panel Assy, Lower.7 3-2. Panel Assy, Upper .7 3-3. LCD Module .8 3-4. Main Board .8 3-5. MD Mechanism Deck .9 3-6. Service Assy, OP .9 3-7. Holder Assy.10 3-8. Motor

20、Flexible Board .10 3-9. Motor, DC (M602) . 11 3-10. “Motor, DC (M601)”, “Motor, DC (M603)” . 11 4.TEST MODE 4-1. Outline.12 4-2. Setting Method of Test Mode.12 4-3. Operation in Setting the Test Mode.12 4-4. Releasing the Test Mode .12 4-5. Configuration of Test Mode .13 4-6. Manual Mode .13 4-7. Ov

21、erall Adjustment Mode .14 4-8. Self-Diagnosis Result Display Mode .14 4-9. Result the Error Display Code .15 4-10. Sound Skip Check Result Display Mode .16 4-11. Key Check Mode.16 TABLE OF CONTENTS 5.ELECTRICAL ADJUSTMENTS 5-1. Outline.18 5-2. Precautions for Adjustment .18 5-3. Adjustment Sequence.

22、 18 5-4. NV Reset .18 5-5. Power Supply Manual Adjustment. 19 5-6. Temperature Correction.20 5-7. Laser Power Check .20 5-8. Overall Adjustment Mode .21 5-9. Resume Clear . 23 5-10. Patch Data Rewriting when Nonvolatile Memory was Replaced. 23 6.DIAGRAMS 6-1. IC Pin Function Description . 29 6-2. Bl

23、ock Diagram Servo Section .35 6-3. Block Diagram Audio Section . 36 6-4. Block Diagram System Control/Power Section . 37 6-5. Printed Wiring Board Main Section . 38 6-6. Schematic Diagram Main Section (1/3) . 41 6-7. Schematic Diagram Main Section (2/3) . 42 6-8. Schematic Diagram Main Section (3/3)

24、 . 43 7.EXPLODED VIEWS 7-1. Panel Section.47 7-2. Chassis Section .48 7-3. MD Mechanism Deck Section. 49 8.ELECTRICAL PARTS LIST. 50 MZ-G750/R700 4 MZ-G750/R700 SECTION 1 SERVICING NOTE NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT The laser diode in the optical pick-up block may suffer e

25、lectro- static break-down because of the potential difference generated by the charged electrostatic load, etc. on clothing and the human body. During repair, pay attention to electrostatic break-down and also use the procedure in the printed matter which is included in the repair parts. The flexibl

26、e board is easily damaged and should be handled with care. NOTES ON LASER DIODE EMISSION CHECK Never look into the laser diode emission from right above when checking it for adjustment. It is feared that you will lose your sight. NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK (LCX-4R) The laser diode i

27、n the optical pick-up block may suffer electro- static break-down easily. When handling it, perform soldering bridge to the laser-tap on the flexible board. Also perform mea- sures against electrostatic break-down sufficiently before the op- eration. The flexible board is easily damaged and should b

28、e handled with care. OPTICAL PICK-UP FLEXIBLE BOARD In performing the repair with the power supplied to the set, removing the MAIN board causes the set to be disabled. In such a case, fix a convex part of the open/close detect switch (S806 on MAIN board) with a tape in advance. Handle the FLEXIBLE b

29、oard (overwrite head) with care, as it has been soldered directly to the MAIN board. In repairing the component side of MAIN board, connect the FLEXIBLE board (overwrite head) and the MAIN board with the lead wires in advance. (See page 8) Replacement of CDX2671-203GA (IC801) used in this set requir

30、es a special tool. 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 reset. Therefore, on the set having the microcomputer version 1.000, change the adjusted values following the Change o

31、f Adjusted Values immediately after the NV was reset. (See page 18) If the nonvolatile memory was replaced on the set, the modified program data must be written to the nonvolatile memory. In such a case, write the modified data that meets the microcomputer version following the patch data rewriting

32、procedure at the replacement of nonvolatile memory. (See page 23) laser-tap S806 MAIN board FLEXIBLE board (Over write head) Tape panel assy, upper 5 MZ-G750/R700 SECTION 2 GENERAL This section is extracted from instruction manual. (MZ-G750) 6 MZ-G750/R700 (MZ-R700) 7 MZ-G750/R700 SetPanel Assy,Lowe

33、rPanel Assy, UpperLCD Module Main BoardMD Mechanism Deck Service Assy, OP Motor Flexible Board Holder Assy Motor, DC (M602) Motor, DC (M601), Motor, DC (M603) Note : This set can be disassemble according to the following sequence. SECTION 3 DISASSEMBLY 3-1. PANEL ASSY, LOWER 3-2. PANEL ASSY, UPPER N

34、ote : Follow the disassembly procedure in the numerical order given. 1 screws (1.4x2.0), MI 2 screws (1.4x2.0), MI 3 panel assy, upper 4 CN801 2 screws (1.4x2.0), MI 3 screws (1.4x2.0), MI 6 Panel Assy , Lower 4 claw 1 5 8 MZ-G750/R700 3-3. LCD MODULE 3-4. MAIN BOARD 1 screws (1.7x2.5) 4 LCD module

35、claws panel assy, upper 2 screws (1.7x2.5) 3 3 screws (M1.4x2) 6 Remove the solders 7 8 Remove the solder 9 case assy, battery qa spring, battery coil qs MAIN board 0 Remove the solder 4 screws (M1.7x3) 5 screws (M1.4x2) 1 CN502 2 arm 9 MZ-G750/R700 3-5. MD MECHANISM DECK 3-6. SERVICE ASSY, OP 1 scr

36、ews (1.4x1.6), MI 2 chassis assy, set 3 MD mechanism deck boss boss 4 spring(s), pack 6 spring, thrust detent 3 screw(M1.4), precision pan 5 screw(M1.4), precision pan 1 washer (0.8 - 2.5) 2 gear (SA) 8 Pull off the lead screw. 7 B A 9 Opening the over write head toward the direction A, remove the O

37、P Service assy toward the direction B. Note: Do not open the entire assy forcibly, when opening the over write head. over write head section 10 MZ-G750/R700 3-7. HOLDER ASSY 2 Remove two solders of DC motor (over write head up/down) (M603). 1 Remove four solders of DC motor (sled) (M602). 3 Remove f

38、our solders of DC motor (spindle) (M601). DC motor (sled) circular hole 5 motor flexible board 4 adhesive 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 4 Remove the holder assy t

39、o direction of the arrow B. 1 Open the holder assy. A 2 B 3 boss 11 MZ-G750/R700 4 two screws(M1.4), precision pan 5 moter, DC (sled) (M602) 3 Remove four solders of motor flexible board. 1 washer (0.8 - 2.5) 2 gear (SA) 1 Remove six solders of motor flexible board. 4 three screws(M1.4), precision p

40、an qs moter, DC (over write head up/down) (M603) 6 two screws(M1.4), precision pan qa chassis assy, gear 0 screw (M1.2 1.5) 9 gear (HA) 8 gear (HB) 7 washer (0.8 - 2.5) 2 washer (0.8 - 2.5) 3 gear (HC) 5 moter, DC (spindle) (M601) DC motor (over write head up/down) (M603) gear chassis assy gear (HA)

41、 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. 3-9. MOTOR, DC (M602) 3-10. “MOTOR, DC (M601)”, “MOTOR, DC (M603)” 12 MZ-G750/R700 2 In the normal mode, turn on the HOLD switch. While press- ing the VOL - key press the follow

42、ing 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 the following dis- play. When theXkey is pressed and hold down, the display at that time is held so that