sony_MZ-R900_service_manual 维修电路图.pdf

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1、SERVICE MANUAL Audio 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 wi

2、th 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 2,800 rpm (CLV) Error correction ACIRC (Advanced Cross Interleave Reed Solomon Code) Sampling frequency 44.1 kHz Sampling rate converter Input: 32 kHz/44.1

3、 kHz/48 kHz Coding ATRAC (Adaptive TRansform Acoustic Coding) ATRAC3 LP2 ATRAC3 LP4 Modulation system EFM (Eight to Fourteen Modulation) Number of channels 2 stereo channels 1 monaural channel Wow and Flutter Below measurable limit Inputs Microphone: stereo mini-jack, minimum input level 0.25 mV Lin

4、e in1): stereo mini-jack, minimum input level 49 mV Optical (Digital) in1): optical (digital) mini-jack Outputs i/LINE OUT2): stereo mini-jack headphones/earphones: maximum output level 5 mW + 5 mW, load impedance 16 ohm LINE OUT: 194 mV, load impedance 10 kilohm 1)The LINE IN (OPT) jack is used to

5、connect either a digital (optical) cable or a line (analog) cable. 2)The i/LINE OUT jack connects either headphones/earphones or a line cable. Power requirements Sony AC Power Adaptor connected at the DC IN 3V jack: 230240 V AC, 50/60 Hz (UK and Hong Kong model) 220230 V AC, 50/60 Hz (European model

6、) 120 V AC, 50 Hz (Canadian model) 240 V AC, 50 Hz (Australian model) 220 V AC, 50 Hz (Chinese model) 110/220 V AC, 60 Hz (Korean model) 100240 V AC, 50/60 Hz (Other models) Nickel metal hydride rechargeable battery NH- 14WM LR6 (size AA) alkaline battery Battery operation time Battery life1) When r

7、ecording2) (Unit: approx.hours)(EIAJ3) 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. Recording time may differ according to the alkaline batteries. BatteriesStereoLP2LP4 NH-14WM nickel m

8、etal hydride rechargeable battery4) 810.513 LR6 (SG) Sony alkaline dry battery5) 71014 NH-14WM nickel metal hydride rechargeable battery4) + One LR6 (SG)5) 192630 Frequency response 20 to 20,000 Hz 3 dB 120 V AC, 60 Hz (US model) PORTABLE MINIDISC RECORDER US Model Canadian Model AEP Model UK Model

9、E Model Australian Model Chinese Model Tourist Model SPECIFICATIONS MZ-R900 US and foreign patents licensed from Dolby Laboratories Licensing Corporation. Photo: Red type Continued on next page Model Name Using Similar MechanismNEW Mechanism TypeMT-MZR900-171 Optical Pick-up NameLCX-4R 9-927-991-13S

10、ony Corporation 2001C0500-1Audio Entertainment Group C 2001.3General Engineering Dept. Ver 1.2 2001. 03 收音机爱好者资料库 Ra d i o Fa n s .CN 2 MZ-R900 TABLE OF CONTENTS 1.SERVICING NOTES.3 2.GENERAL.4 3.DISASSEMBLY 3-1.Disassembly Flow .5 3-2.Panel Assy, Bottom .5 3-3.Panel Assy, Upper Section .6 3-4.“LCD

11、Module”, “Panel Assy, Upper” .6 3-5.MAIN Board Assy .7 3-6.“Case Assy, Battery”, “MAIN Board” .7 3-7.Strip, Ornamental .8 3-8.“MD Mechanism Deck (MT-MZR900-171)”, “Chassis Assy, Set” .8 3-9.Service Assy, OP (LCX-4R) .9 3-10. Holder Assy . 10 3-11. MOTOR FLEXIBLE Board. 10 3-12. Motor, DC (Sled) (M60

12、2) . 11 3-13. “Motor, DC (Spindle) (M601)”, “Motor, DC (Over Write Head UP/DOWN) (M603). 11 4.TEST MODE. 12 5.ELECTRICAL ADJUSTMENTS. 17 6.DIAGRAMS 6-1.Block Diagram SERVO Section . 27 6-2.Block Diagram AUDIO Section . 28 6-3.Block Diagram KEY CONTROL/DISPLAY/ POWER SUPPLY Section . 29 6-4.Printed W

13、iring Boards. 30 6-5.Schematic Diagram . 31 6-6.IC Pin Function Description . 33 7.EXPLODED VIEWS 7-1.Panel Section . 39 7-2.Chassis Section . 40 7-3.MD Mechanism Deck Section (MT-MZR900-171). 41 8.ELECTRICAL PARTS LIST. 42 SAFETY-RELATED COMPONENT WARNING! COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED

14、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 PUB- LISHED BY SONY. Dimensions Approx. 78.9 17.1 72.0 mm (w/h/d) (31/8 11/16 27/8 in.) Mass A

15、pprox. 110 g (3.9 oz) the recorder only Supplied accessories AC power adaptor (1) Headphones/earphones with a remote control (1) Rechargeable battery (1) Dry battery case (1) Rechargeable battery carrying case (1) Carrying pouch/carrying case with a belt clip AC plug adaptor (World model only) (1) O

16、ptical cable (1) Design and specifications are subject to change without notice. 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 (SG) “STAMINA” alkaline dry battery (produced

17、in Japan). On power sources For use in your house: Use the AC power adaptor supplied with this recorder. Do not use any other AC power adaptor since it may cause the recorder to malfunction. Polarity of the plug 4)When using a 100% fully charged rechargeable battery. 5)When using a Sony LR6 (SG) “ST

18、AMINA” alkaline dry battery (produced in Japan). When playing (Unit: approx.hours)(EIAJ1) BatteriesStereoLP2LP4 NH-14WM nickel metal hydride rechargeable battery2) 212326 LR6 (SG) Sony alkaline dry battery3) 303538 NH-14WM nickel metal hydride rechargeable battery2) + One LR6 (SG)3) 536066 3)Measure

19、d in accordance with the EIAJ(Electronic Industries Association of Japan) standard. (except U.S.A model) (1) ATTENTION AU COMPOSANT AYANT RAPPORT LA SCURIT! LES COMPOSANTS IDENTIFIS PAR UNE MARQUE 0 SUR LES DIAGRAMMES SCHMATIQUES ET LA LISTE DES PICES SONT CRITIQUES POUR LA SCURIT DE FONCTIONNEMENT.

20、 NE REMPLACER CES COM- POSANTS QUE PAR DES PICES SONY DONT LES NUMROS SONT DONNS DANS CE MANUEL OU DANS LES SUPPLMENTS PUBLIS PAR SONY. 收音机爱好者资料库 Ra d i o Fa n s .CN 3 MZ-R900 NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK OR BASE UNIT The laser diode in the optical pick-up block may suffer electro- st

21、atic 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 flexible board is

22、 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 in the opti

23、cal 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 be handled

24、with care. OPTICAL PICK-UP FLEXIBLE BOARD SECTION 1 SERVICING NOTES 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. Handl

25、e the FLEXIBLE board (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 7) laser-tap upper panel assy MAIN board Tape S

26、806 FLEXIBLE board (Over write head) Replacement of CDX2671-203GA (IC801) used in this set requires 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

27、the set having the microcomputer version 1.000, change the adjusted values following the Change of Adjusted Values immediately after the NV was reset. (See page 17) If the nonvolatile memory was replaced on the set, the modified program data must be written to the nonvolatile memory. In such a case,

28、 write the modified data that meets the microcomputer version following the patch data rewriting procedure at the replacement of nonvolatile memory. (See page 22) Notes on chip component replacement Never reuse a disconnected chip component. Notice that the minus side of a tantalum capacitor may be

29、dam- aged by heat. Flexible Circuit Board Repairing Keep the temperature of the soldering iron around 270 C dur- ing 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. C

30、AUTION Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous ra- diation exposure. 收音机爱好者资料库 Ra d i o Fa n s .CN 4 MZ-R900 SECTION 2 GENERAL This section is extracted from instruction manual. 8 Looking at controls See pages in ( ) for m

31、ore details. The recorder A END SEARCH button (17) (47) B Battery compartment (13) C Jog lever (L) (MENU/ENTER) (11) (20) (25) (34) (43) (53) D VOL +/ button (19) (47) E REC MODE button (23) F REC indicator (29) G Terminals for attaching dry battery case (14) H SYNCHRO REC ON/OFF (synchro- recording

32、) switch (at the rear) (24) I DC IN 3V jack (13) (16) J HOLD switch (at the rear) (14) (55) K REC (record) switch (17) (25) L OPEN button (15) M X (pause) button (17) (19) (27) (31) (44) (47) (51) N Display window (24) (34) (53) O Jog lever (R) (N, ./) (12) (17) (19) (44) (47) P x (stop)/CHARGE butt

33、on (13) (17) (19) (23) (43) Q LINE IN (OPT) jack (16) (22) R MIC (PLUG IN POWER) jack (25) S T MARK button (44) T i (headphones/earphones)/LINE OUT jack (14) (31) (41) 1 2 3 4 5 q; 6 7 ql w; qk qj qh qg qf qd qs qa 9 8 9 The display window of the recorder A Alarm indication (53) B Character informat

34、ion display (29) (34) Displays the disc and track names, date, error messages, track numbers, etc. C AM/PM indication (30) Lights up along with the time indication in the 12-hour system. D Time display (29) (40) Shows the recorded time, current time, elapsed time of the track or MD being recorded or

35、 played. E Battery indication (13) Shows approximate battery condition. F Sound indication (36) Lights up when Digital Sound Preset is on. G Level meter (28) Shows the volume of the MD being played or recorded. H LP2, LP4, MONO (monaural) indication (23) I SYNC (synchro-recording) indication (24) Li

36、ghts up while synchro-recording. J REC indication (17) Lights up while recording. When flashing, the recorder is in record standby mode. K REC DATE (recorded/current date) indication (40) Lights up along with the date and time the MD was recorded. When only “DATE” lights up, the current date and tim

37、e are displayed. L REMAIN (remaining time/tracks) indication (28) (40) Lights up along with the remaining time of the track, the remaining time of the MD, or the remaining number of tracks. M Play mode indication (34) Shows the play mode of the MD. N Disc indication (24) (34) Shows that the disc is

38、rotating for recording, playing or editing an MD. 12345 6789q;qaqsqdqf 10 The headphones/earphones with a remote control A DISPLAY button (29) (38) (46) (48) (53) B PLAYMODE button (35) (48) C RPT/ENT (repeat/enter) button (36) (37) D SOUND button (36) E Clip F X (pause) button (19) (48) (51) G Cont

39、rol (./N) (12) (19) (36) (46) (48) (51) (53) N : play, AMS, FF . : REW H Control (VOL +/) (12) (19) (48) Pull and turn to adjust the volume. I Display window (29) (36) J HOLD switch (14) (55) K x (stop) button (19) (38) (46) (53) The display window of the remote control A Track number display (29) (

40、36) (54) B Character information display (29) (36) (54) C Disc indication (29) (36) (54) D Alarm indication (54) E Play mode indication (36) F Battery indication (29) (36) (54) G REC indication (17) (29) H SOUND indication (36) + A B C DE K F G IJ H F HG ABCDE 5 MZ-R900 This set can be disassembled

41、in the order shown below. 3-1.DISASSEMBLY FLOW SECTION 3 DISASSEMBLY Note: Follow the disassembly procedure in the numerical order given. 3-2.PANEL ASSY, BOTTOM 3-2. PANEL ASSY, BOTTOM 3-3. PANEL ASSY, UPPER SECTION SET 3-4. “LCD MODULE”, “PANEL ASSY, UPPER” 3-6. “CASE ASSY, BATTERY”, “MAIN BOARD” 3

42、-8. “MD MECHANISM DECK (MT-MZR900-171)”, “CHASSIS ASSY, SET” 3-7. STRIP, ORNAMENTAL 3-5. MAIN BOARD ASSY 3-9. SERVICE ASSY, OP (LCX-4R) 3-10. HOLDER ASSY 3-11. MOTOR FLEXIBLE BOARD 3-12. MOTOR, DC (SLED) (M602) 3-13. “MOTOR, DC (SPINDLE) (M601)”, “MOTOR, DC (OVER WRITE HEAD UP/DOWN) (M603)” 5two scr

43、ews (1.4) 6Remove the “panel assy, bottom” in the direction of arrow A. 5screw (1.4) 5two screws (1.4) 4Close the battery terminal (plus). 1Open the lid, battery case. 3lid, battery case S802 S801 2claw A knob (hold) Note: On installation, adjust the position of both two switches (S801, S802) and tw

44、o knobs (hold). 6 MZ-R900 3-3.PANEL ASSY, UPPER SECTION 3-4.“LCD MODULE”, “PANEL ASSY, UPPER” 3two screws (1.4) 4panel assy, upper section 2Push button (open). 3two screws (1.4) 1flexible board (CN801) 1four screws (1.7) 3button (A), control Note: On installation, adjust the hole of “button (A), con

45、trol” and boss of “panel assy, upper”. (in the fig. , ) 4button (B), control Note: On installation, adjust the boss of “button (B), control” and hole of “panel assy, upper”. (in the fig. , ) 5panel assy, upper 2LCD module ab a a b b c c d d dc 7 MZ-R900 3-5.MAIN BOARD ASSY 3-6.“CASE ASSY, BATTERY”, “MAIN BOARD” 3four screws (M1.4 toothed lock) 4screw (1.4) 2flexible board (CN502) 1Remove two solders of flexible board. 6flexible board (CN501) 5 7main board assy 2case assy, battery 3main board 1Remove the solder of terminal (minus). 1Remove the sol