索尼 sony_MZ-B50_service_manual 电路图 维修手册.pdf

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1、MZ-B50 SERVICE MANUAL PORTABLE MINIDISC RECORDER US Model Canadian Model AEP Model Tourist Model SPECIFICATIONS Model Name Using Similar Mechanism NEW Mechanism T ype MT -MZB50-165 Optical Pick-up Name LCX-2R US and foreign patents licensed from Dolby Laboratories Licensing Corporation System Audio

2、playing system MiniDisc digital audio system Laser diode properties Material: GaAlAs Wavelength: = 790 nm 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.) Re

3、cording and playback time Maximum 80 minutes (MDW-80, stereo recording) Maximum 160 minutes (MDW-80, monaural recording) Maximum 74 minutes (MDW-74, stereo recording) Maximum 148 minutes (MDW-74, monaural recording) Revolutions 400 rpm to 1,800 rpm (CLV) Error correction Advanced Cross Interleave Re

4、ed Solomon Code (ACIRC) Sampling frequency 44.1 kHz Sampling rate converter Input: 32 kHz/44.1 kHz/48 kHz Coding Adaptive TRansform Acoustic Coding (ATRAC) Modulation system EFM (Eight to Fourteen Modulation) Number of channels 2 stereo channels 1 monaural channel Speaker 28 mm (1 1/8 in.) dia. Freq

5、uency response 20 to 20,000 Hz 3 dB Wow and Flutter Below measurable limit Inputs Microphone: stereo mini-jack, 0.35 1.38 mV Line in: stereo mini-jack, 69 194 mV Optical (Digital) in: optical (digital) mini-jack Outputs i : stereo mini-jack Headphones/earphones: 5 mW + 5 mW Speaker: 300 mW Continued

6、 on next page Ver 1.1 2001.03 With SUPPLEMENT-1 (9-927-952-83) 9-927-952-12 2001C0200-1 2001.3 Sony Corporation Audio Entertainment Group General Engineering Dept. 2 1. SERVICING NOTES 3 2. GENERAL 4 3. DISASSEMBLY 3-1. Panel (Lower) ASSY 6 3-2. Main Board, Sled Control Board 6 3-3. Panel (Upper Lid

7、) ASSY 7 3-4. Key Board Unit 7 3-5. BATT Board, DC Jack Board 8 3-6. Mechanism Deck 8 3-7. Optical Pick-up 9 4. TEST MODE 10 5. ELECTRICAL ADJUSTMENTS 17 6. DIAGRAMS 6-1. Explanation of IC Terminals 22 6-2. Block Diagram Main Section (1/3) 29 6-3. Block Diagram Main Section (2/3) 31 6-4. Block Diagr

8、am Main Section (3/3) 33 6-5. Printed Wiring Boards Main Section (1/2) 35 6-6. Printed Wiring Boards Main Section (2/2) 37 6-7. Printed Wiring Boards Battery Section 39 6-8. Schematic Diagram Main Section (1/4) 41 6-9. Schematic Diagram Main Section (2/4) 43 6-10. Schematic Diagram Main Section (3/4

9、) 45 6-11. Schematic Diagram Main Section (4/4) 47 7. EXPLODED VIEWS 7-1. Panel (Lower) Section 55 7-2. Panel Upper Lid Section 56 7-3. Cabinet (Belt) Section 57 7-4. Mechanism Deck Setion (MT-MZB50-165) 58 8. ELECTRICAL PARTS LIST 59 SAFETY-RELATED COMPONENT WARNING! COMPONENTS IDENTIFIED BY MARK 0

10、 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. Flexible Circuit Board Repairing Keep the temperature of the sol

11、dering iron around 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 t

12、hat the minus side of a tantalum capacitor may be dam- aged by heat. TABLE OF CONTENTS CAUTION Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure. General Power requirements DC 3V Two LR6 (size AA) alkaline batteri

13、es Battery operation time Battery life 1)(EIAJ 2) ) Batteries Recording Playback Two LR6 (size AA) Approx. Approx. Sony alkaline dry batteries 6 hours 18 hours 1) The battery life may be shorter due to operating conditions, the temperature of the location, and varieties of batteries. 2) Measured in

14、accordance with the EIAJ (Electronic Industries Association of Japan) standard. 3) When using LR6 (SG) Sony “STAMINA” alkaline dry batteries (produced in Japan). 4) To prevent interrupted recording due to drained batteries, use new batteries for recording operations. 5) When played using the built-i

15、n speaker. Dimensions Approx. 88.0 28.0 121.4 mm (w/h/d) (3 1/2 1 1/8 4 7/8 in.) not incl. projecting parts and controls. Mass Approx. 240 g (8.4 oz) Supplied accessories Headphones/earphones with a remote control (1) Sony LR6 (size AA) dry batteries (2) Carrying pouch (1) Hand strap (1) Design and

16、specifications are subject to change without notice. 3 NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT The laser diode in the optical pick-up block may suffer electrostatic break-down because of the potential difference generated by the charged electrostatic load, etc. on clothing and the h

17、uman 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 flexible board is easily damaged and should be handled with care. NOTES ON LASER DIODE EMISSION CHECK Never look into the laser diode emissi

18、on 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-2R) The laser diode in the optical pick-up block may suffer electrostatic break-down easily. When handling it, perform soldering bridge to the laser-tap o

19、n the flexible board. Also perform measures against electrostatic break-down sufficiently before the operation. The flexible board is easily damaged and should be handled with care. OPTICAL PICK-UP FLEXIBLE BOARD SECTION 1 SERVICING NOTES When repairing this device with the power on, if you remove t

20、he MAIN board or open the upper panel assy, this device stops work- ing. In this case, you can work without the device stopping by fasten- ing the hook of the open/close detect switch (S801). This set is designed to perform automatic adjustment for each adjustment and write its value to EEPROM. Ther

21、efore, when EEPROM (IC802) has been replaced in service, be sure to per- form automatic adjustment and write resultant values to the new EEPROM. (Refer to Section 5 Electrical Adjustment. (page 17) Replacement of CXD2660GA (IC502) and CXR701080-020GA (IC801) used in this set requires a special tool.

22、 laser-tap S801 4 SECTION 2 GENERAL LOCATION AND FUNCTION OF CONTROLS Front of the recorder Back of the recorder This section is extracted from instruction manual. 1 2 3 4 5 6 7 8 9 0 qa qs qd qf qg qh qj qk ql w; wa ws wd wf 1 EASY SEARCH +/ buttons 2 VOR indicator 3 PLAY MODE button 4 DISPLAY butt

23、on 5.REVIEW/AMS/CUE/AMS (search /AMS) button 6 FAST PB button 7x STOP button 8 i (headphones/earphones) jack 9 OPEN switch 0N PLAY (play) button qaX PAUSE button qs HOLD switch qd Display window qf Microphones qg Speaker qh EDIT/ENTER button qj DC IN 3V jack qk TRACK MARK button ql ERASE button w; R

24、EC MODE switch wa VOR button ws VOL control wd REC indicator wfz REC button 2 1 3 7 6 5 4 1 Battery compartment 2 CLOCK SET button 3 SYNCHRO REC (synchro-recording) switch 4 MIC (PLUG IN POWER) jack 5 LINE IN (OPTICAL) jack 6 MIC SENS switch 7 MEGA BASS button 5 1 2 9 0 qj qs qd 3 4 5 6 7 8 qa qf qg

25、 qh 1 2 3 4 5 7 6 8 9 0 1 V-UP indication 2 Fast Playback indication 3 Disc indication Shows that the disc is rotating for recording, playing or editing an MD. 4 STEREO (stereo)/MONO (monaural) indication 5 Play mode indication 6 REC indication Lights up while recording. When flashing, the recorder

26、is in record standby mode. 7 Pause indication 8 SYNC (synchro-recording) indication 9 VOR indication 0 Mega Bass indication qa Character information display Displays the disc and track names, date, error messages, track numbers, etc. qs Battery indication qd REMAIN (remaining time/tracks) indication

27、 Lights up along with the remaining time of the track, the remaining time of the MD, or the remaining number of tracks. qf REC DATE (recorded/current date) indication Lights up along with the date and time he MD was recorded. When only “ DATE” lights up, the current date and time are displayed. qg T

28、ime display qh Level meter Shows the volume of the MD being played or recorded. qj AM/PM indication 1 Stereo mini plug 2 V-UP button 3 TRACK MARK button 4 HOLD switch Slide to lock the controls of the remote control. 5 X (pause) button 6 Headphones/earphones 7 x (stop) button 8 N buttons 9 .REVIEW/A

29、MS 0 VOL control The display window The headphones/earphones with a remote control 6 SECTION 3 DISASSEMBLY Note : Follow the disassembly procedure in the numerical order given. 3-1. PANEL (LOWER) ASSY 3-2. MAIN BOARD, SLED CONTROL BOARD z The equipment can be removed using the following procedure. 1

30、 Screws (B1.7x6) 2 Screws (B1.7x5) 5 Screw (B1.7x5) Ornament (R) Ornament (L) 4 Claws 6 Claw 7 Claws 7 Claws 3 Claw 8 Panel (lower) Assy 5 Connector unit (CN801) 6 OP flexible board 0 Remove solder (3 places) 9 Remove solder (4 places) 7 Switch unit (CN802) 8 Motor flexible board (CN602) qa Remove s

31、older (4 places) 4 Screws (1.7x3) 4 Screw (1.7x3) 1 Screws (1.7x3) 2 OPEN Main board Sled control board 3 qs Panel (lower) ASSY Main board, Sled control board Panel (upper lid) ASSY Key board unit BATT board, DC jack board Mechanism deck Optical pick-up Set 7 3-3. PANEL (UPPER LID) ASSY 3-4. KEY BOA

32、RD UNIT 1 Screw (step M1.4) 2 Panel (upper lid) ASSY Spring (UP), tension 3 Claw 3 Claw 1 Screw (step M1.4) 2 Screws (B1.7x4) 2 Screws (B1.7x4) 6 Screws (1.7x3) Panel (upper lid) sub ASSY 4 Screws (1.7x3) 8 7 3 5 Cabinet (upper lid) Button (upper lid) Key board unit 1 Screw, ornament 8 3-5. BATT BOA

33、RD, DC JACK BOARD 3-6. MECHANISM DECK 1 Screws (1.7x3) 3 4 Screws (1.7x3) 2 Insert a precision screwdriver and move a point of battery terminal (+) away from a claw. 1 Screws (1.7x3) BATT board Cabinet (belt) DC jack board 5 Head flexible board (CN2001) 8 Motor flexible board 2 Screws (1.7x2.5) 1 Sp

34、acer (flexible cover) 1 Spacer (flexible cover) 7 OP flexible board 6 4 Mechanism deck (MT -MZB50-165) Cover (flexible) 2 Screws (1.7x2.5) 3 Screws (step) 4 Cover (flexible) 9 3-7. OPTICAL PICK-UP 8 Bearing 5 Screw 4 Rack spring 3 Precision pan screw (M1.4) 1 Washer (0.8 - 2.5) 2 Gear (SA) 5 Screw 7

35、 Pull off the lead screw. 6 Mechanism deck (MT -MZB50-165) Optical pick-up (LCX-2R) B A 0 Opening 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 write head. 9 Peel off the head flexible

36、board Over write head section 10 SECTION 4 TEST MODE Outline This set provides the Overall adjustment mode (Assy mode) that allows CD and MO disc to be automatically adjusted when in the test mode. In this overall adjustment mode, the protect switch is detected to judge the disc, CD or MO, and each

37、adjustment is automatically executed in order. If a fault is found, the system displays its location. Also, the manual mode allows each indi- vidual adjustment to be automatically adjusted. The keys in the description refer to the keys on both set and remote commander unless otherwise specified. Tho

38、ugh LCD display shows the LCD of the remote commander, same con- tents are also displayed on the LCD of the set. Setting Method of Test Mode There are two different methods to set the test mode: 1 Short BP801 (TEST) on the MAIN board with a solder bridge (connect pin y; of IC801 to the ground). Then

39、, turn on the power. 2 In the normal mode, turn on the HOLD switch on the set. While pressing the N key on the set, press the following set keys in the following order: t t .t .t t .tt .t Xt X Operation in Setting the Test Mode When the test mode becomes active, first the display check mode is selec

40、ted. (Press x key once, when the display check mode is not active.) Other mode can be selected from the display check mode. When the test mode is set, the LCD repeats the following dis- play. LCD display When the X key is pressed and hold down, the display at that time is held so that display can be

41、 checked. Releasing the Test Mode For test mode set with the method 1: Turn off the power and open the solder bridge on BP801 (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

42、: If electrical adjustment (see page 18) has not been finished com- pletely, always start in the test mode. (The set cannot start in nor- mal mode.) Microprocessor version display All off All lit V0.000 000 R R848 R850 R849 R851 C810 R802 C807 R813 R812 R807 R804 R803 R805 R838 1 5 10 6 IC804 C808 *

43、 IC801 X802 X801 BP801 SHORT: TEST MODE OPEN: NORMAL MODE L801 GRN YEL T BP801 SHORT: TEST MODE OPEN: NORMAL MODE MAIN BOARD (SIDE A) 11 Configuration of Test Mode Manual Mode Mode to adjust or check the operation of the set by function. Normally, the adjustment in this mode is not executed. Transit

44、ion method in Manual Mode 1. Setting the test mode. (See page 10) 2. Press the or EASY SEARCH + key activates the manual mode where the LCD display as shown below. 3. The optical pick-up moves outward or inward while the or . key is pressed for several seconds respec- tively. 4. Each test item is as

45、signed with a 3-digit mode number; 100th place is a major item, 10th place is a medium item, and unit place is a minor item. Manual Mode Servo Mode Audio Mode Power Mode OP Alignment Mode Overall Adjustment Mode Self-Diagnosis Display Mode Press the or EASY SEARCH + key Key Check Mode Test Mode $Dis

46、play Check Mode% Press the x key Press the x key Press the x key Press the x key Press the . or EASY SEARCH - key Press the N or REC key on the set Press the DISPLAY key Press the TRACK MARK key on the remote commander for several seconds. Quit the key check or open the upper panel Sound Skip Check

47、Result Display Mode LCD display Manual 000 EASY SEARCH + key:100th place of mode number increase. EASY SEARCH - key: 100th place of mode number decrease. Major item switching EASY SEARCH + key: 10th place of mode number increase. EASY SEARCH - key: 10th place of mode number decrease. EASY SEARCH + k

48、ey: Increases the adjusted value EASY SEARCH - key: Decreases the adjusted value Medium item switchingN key x key Minor item switching Adjusted value variation X key: When adjusted value is changed: Adjusted value is written. When adjusted value is not changed: That item is adjusted automatically. Adjusted value writeN keyN key: Unit place of mode number increase. x key 12 5. Set the mode No. to 011. The display changes a shown below each time the DISPLAY key is pressed. However in the power mode (mode number 700s), only the power adjustment value is displayed. 6. Quit the manual