SONY MDMT877 维修电路图.pdf

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1、MD-MT877/MD-MT877C CONTENTS Page SPECIFICATIONS . 2 NAMES OF PARTS . 3 OPERATION MANUAL . 5 DISASSEMBLY. 10 REMOVING AND REINSTALLING THE MAIN PARTS. 11 ADJUSTMENT . 12 NOTES ON SCHEMATIC DIAGRAM . 28 TYPES OF TRANSISTOR AND DIODE . 28 BLOCK DIAGRAM . 29 SCHEMATIC DIAGRAM . 30 WIRING SIDE OF P.W.BOA

2、RD. 32 VOLTAGE . 36 WAVEFORMS OF MD CIRCUIT . 37 TROUBLESHOOTING . 38 FUNCTION TABLE OF IC. 41 PARTS GUIDE/EXPLODED VIEW PACKING OF THE SET (MD-MT877(S) FOR U.S.A. ONLY) SERVICE MANUAL SHARP CORPORATION No. S3118MDMT877/ This document has been published to be used for after sales service only. The c

3、ontents are subject to change without notice. MD-MT877(S) MODELMD-MT877C(S) In the interests of user-safety the set should be restored to its original condition and only parts identical to those specified be used. PORTABLE MINIDISC RECORDER 收音机爱好者资料库 Ra d i o Fa n s .CN 2 MD-MT877/MD-MT877C FOR A CO

4、MPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER TO THE OPERATION MANUAL. Specifications for this model are subject to change without prior notice SPECIFICATIONS Power sourceDC 1.2V:Rechargeable Nickel-Metal Hydride battery (AD-N55BT) x 1 DC 5V:AC adaptor (AC 120V, 60 Hz) DC 1.5V:Comme

5、rcially available, “AA” size (LR6), alkaline battery x 1 DC 1.5V:Separately available car adaptor, AD-CA55X (for cars with a 12-24V DC negative ground electrical sys- tem) (Used with separately available plug adaptor (AD-M66PA) Power consumption7 W (AC adaptor) Output powerRMS; 10 mW (5 mW + 5 mW) (

6、0.2% T.H.D.) Charging timeApprox. 3.5 hours Input sensitivityMIC H: reference input level0.25 mVinput impedance10 k ohms MIC L: reference input level2.5 mVinput impedance10 k ohms LINE:reference input level100 mVinput impedance20 k ohms Output levelEarphones:maximum output level5 mW + 5 mWload imped

7、ance32 ohms LINE:specified output250 mV (-12 dB)load impedance10 k ohms DimensionsWidth:2-27/32” (71.9 mm) Height: 11/16” (16.8 mm)Depth: 3-1/8” (78.7 mm) Weight0.29 lbs. (131 g) with rechargeable battery Input jackLine/optical digital, microphone (powered by the main unit) Output jackEarphones (imp

8、edance: 32 ohms)/remote control unit TypePortable MiniDisc recorder Signal readoutNon-contact, 3-beam semiconductor laser pickup Audio channelsStereo 2 channels/monaural (long-play mode) 1 channel Frequency response20 20,000 Hz ( 3 dB) Rotation speedApprox. 400 1,350 rpm Error correctionACIRC (Advan

9、ced Cross Interleave Reed-Solomon Code) CodingATRAC/ATRAC3 (Adaptive TRansform Acoustic Coding), 24-bit computed type Recording methodMagnetic modulation overwrite method Sampling frequency44.1 kHz (32 kHz and 48 kHz signals are converted to 44.1 kHz, and then recorded.) Wow and flutterUnmeasurable

10、(less than 0.001% W. peak) Battery life G The above values are the standard values when the unit is operated hori- zontally and charged at an ambient temperature of 77F (25C). (The operable duration with the rechargeable battery will be shorter when the unit is carried around.) G The volume level is

11、 set at “VOL 15”. G The LED is set at “LIGHT OFF”. G Operable duration with a commercially available battery varies depend- ing on its maker, type, and conditions of use. G “Fully charged” means that the charging is complete after approximately 3.5 hours since the remaining amount of the battery is

12、reduced to “ ” (1 bar). When using the rechargeable battery (fully charged) included with the unit When using one, commercially avail- able, high capacity, “AA” size (LR6), al- kaline battery (The rechargeable bat- tery is in the unit, discharged.) When using one, commercially avail- able, high capa

13、city, “AA” size (LR6), al- kaline battery with the rechargeable bat- tery (fully charged) Stereo2 times long4 times long ContinuousContinuous Continuous Continuous Continuous Continuous recording:play:recording:play:recording:play: Approx.Approx.Approx.Approx.Approx.Approx. 6.5 hours12 hours9 hours1

14、3.5 hours11.5 hours15 hours ContinuousContinuous Continuous Continuous Continuous Continuous recording:play:recording:play:recording:play: Approx.Approx.Approx.Approx.Approx.Approx. 6 hours16 hours10 hours19.5 hours13 hours22 hours ContinuousContinuous Continuous Continuous Continuous Continuous rec

15、ording:play:recording:play:recording:play: Approx.Approx.Approx.Approx.Approx.Approx. 15 hours29 hours22 hours33 hours30 hours40 hours 收音机爱好者资料库 Ra d i o Fa n s .CN 3 MD-MT877/MD-MT877C NAMES OF PARTS Main unit 1. Record/Track Mark Button 2. Mode Button 3. Volume/Cursor/Fast Forward/Fast Reverse/ Re

16、cording Level/Name Select Button 4. Stop/Power Off/Hold Button 5. Open Lever 6. Display/Character Select Button 7. Edit/Auto Mark/Time Mark Button 8. Play/Pause Button 9. Enter/Fast Play/Synchro Button 10. Bass/Delete Button 11. Rechargeable Battery Cover 12. Handstrap Holder 13. Optical/Line Input

17、Jack 14. Microphone Input Jack 15.Remote Control/Earphones/Line Output Jack 1. Level Meter 02. Record Indicator 03. Synchro Recording Indicator 04. Operation Indicator 05. Long-play/Recording Mode Indicator 6. Character/Time Information Indicator 7. Repeat Indicator 8. Battery Indicator 9. Random In

18、dicator 10. Track Number Indicator 11. TOC Indicator 12. Disc Name Indicator Main unit display panel 3-color LED Various modes are indicated with three colors of lights. ChargingLighting starting with yellow-green light. RefreshExtinguishing starting with orange light after all the lights are lit. P

19、laybackFlashing the color of the activated play- back mode. RecordingFlashing the color of the activated re- cording mode. Fast ForwardFlashing starting with yellow-green light. Fast ReverseFlashing starting with orange light. Volume (+)Lighting starting with yellow-green light. Volume ()Extinguishi

20、ng instantly starting with or- ange light after all the lights are lit. TOCReading: flashing at random. 13 14 15 12 2 1 3 4 5 6 7 8 9 10 11 1 2 3 4 5 6 7 8 9 10 11 12 Blue Yellow- greenOrange 收音机爱好者资料库 Ra d i o Fa n s .CN 4 MD-MT877/MD-MT877C 1. Record Indicator 02. Track Number Indicator 03. Operat

21、ion Indicator 04. Character/Time Information Indicator 05. Battery Indicator 06. Random Indicator 07. Synchro Recording Indicator 08. Total Track Number Indicator 09. Long-play/Recording Mode Indicator 10. Repeat Indicator Remote control display panel Remote control unit 1. Earphones Jack 2. Fast Fo

22、rward/Fast Reverse Button 3. Display Button 4. Play Mode Button 5. Sound/Track Mark Button 6. Stop/Power Off Button 7. Play/Pause Button 8. Volume Button 9. Hold Switch 1. Remote Control Holder (You can hang the remote control on it.) 2. Lock Detector 3. Hook For Fixing The Main Unit 4. Charge/Opera

23、tion Switch 5. Stand 6. AC Adaptor Connecting Jack Battery charger 1 8679 2345 123456 78910 1 4 5 6 3 2 CHARGE OPERATION 5 MD-MT877/MD-MT877C OPERATION MANUAL Using with the Rechargeable Battery Charging When the rechargeable battery is used for the first time or when you want to use it after a long

24、 period of disuse, be sure to charge it fully. GAfter the rechargeable battery is charged or used, it will get slightly warm. This is normal. GWhen the portable MD is turned on or operating, the bat- tery will not be charged. AC 120V 60Hz Charge mode Do not force the battery cover open too far. 1Ins

25、ert the rechargeable battery. 2Move the Charge/Operation switch to charge mode. 3Place the portable MD into the battery charger and connect the AC adaptor. To the DC IN 5V jack Checking the remaining amount of battery level The remaining amount of battery level is shown by the battery indicator ( )

26、during operation. GWhen the battery is completely discharged, the battery indicator will flash. Recharge the battery or replace the alkaline battery with a new one. GWhen the battery has run completely out, “BATT EMPTY (LoBATT)” will appear. Then, the power will be discon- nected automatically. Note

27、s: GIf you use the battery which you stopped charging half- way, “” may appear. It does not mean that the bat- tery is completely charged. GThe battery indicator will not correctly display the remain- ing capacity for approximately 20 seconds after the power has been turned on. GWhen the AC adaptor

28、or a separately available car adap- tor is used, the battery indicator will not be shown. GThe number of bars shown in the battery indicator may increase or decrease, depending on the operation be- ing performed. This is normal. Checking Displays When the battery level is high When the battery low i

29、s very low How to read the battery indicator 6 MD-MT877/MD-MT877C Error Messages ERROR MESSAGES BATT EMPTY (LoBATT) BLANK MD (BLANK) Cant COPY (CantC) Cant EDIT (CantE) Cant READ * (CantS) (CantT) (CantU) Cant REC (CantR) Cant STAMP Cant WRITE (CantW) CHARGEmode DEFECT (DEFECT) DISC FULL Er-MD * (Er

30、MD*) HOLD (HOLD) LOCKED (CantLOCK) MEANING G The battery is run down. G Nothing is recorded. G You tried to record from a copy prohibited MiniDisc. G A track cannot be edited. G The disc data cannot be read because the disc is damaged. G Recording cannot be performed correctly due to vibration or sh

31、ock. G Stamp function does not work. G Cannot save the TOC information correctly to a MiniDisc. (A large portion of the disc has been damaged.) G The Charge/Operation switch is not set to the operation mode when using this unit with the AC adaptor. G The disc is scratched. G The disc is out of recor

32、ding space. G The microprocessor has reported a system fault and the unit is out of order. G The unit is in the hold mode. G You removed a MiniDisc while recording or editing. REMEDY G Charge the rechargeable battery or replace the alka- line battery (or use the AC adaptor for power). G Replace the

33、disc with a recorded disc. G Record using the analog cable. (MD-MT877(S) G Record using the analogue cable. (MD-MT877C(S) G Change the stop position of the track and then edit it. G Reload the disc. G Replace it with another recorded disc. G Re-record or replace it with another recordable disc. G Ch

34、eck the number of tracks. G Replace the disc with another recordable disc. G Set the Charge/Operation switch to the operation mode. G If the sound you hear is not right, record again. G Replace the disc with another recordable disc. G Replace it with another recordable disc. G To have it repaired, g

35、o to the distributor where you pur- chased the unit. G Return the HOLD switch to its original position. G Turn off the power and remove the MiniDisc. Error Messages : continued ERROR MESSAGES NO DISC NO SIGNAL (noSIG.) PLAY MD (PLAYmd) POWER ? PROTECTED SORRY (Sorry) TEMP OVER (TEMP!) TOC FORM * (Tf

36、orm*) TOC FULL Tr. Protect ? DISC (? DISC) MEANING G A disc has not been loaded. G Poor connection of the digital cable. G No output signal comes out from the connected unit to playback. G The input signal has improper sampling fre- quency. G You recorded on a playback-only disc. G The battery charg

37、er is defective. GThe write protection tab of a MiniDisc is set to the protected position. GYou tried to record on a playback-only disc. G Since a track number is currently being located or updated, the unit cannot accept your com- mand. G The temperature is too high. G There is an error in the reco

38、rding signal. G There is no space left for recording character information (track names, disc names, etc.). G The track has been protected from being erased. G A disc which contains data other than music was played. G There is an error in the signal recorded on the disc. G Stamping is not possible.

39、REMEDY G Load a disc. G Connect the digital cable securely. G If the portable CD player has a function to prevent sound skips, deactivate it. G Playback with the connected unit. G Replace it with a recordable disc. G To have it repaired, go to the distributor where you purchased the unit. GMove the

40、write protection tab back to its original position. G Replace it with a recordable MiniDisc. G Wait for a while and try the operation again. G Turn off the power, and wait for a while. G Erase all of the tracks, and then record again. G Replace it with another recordable disc. G Edit the track with

41、the device on which it was recorded. G A disc which contains non-music data cannot be played. G Replace it with another recorded disc. G Retry. ( ) : Error messages seen on the remote control. Number or symbol appears in * position. 7 MD-MT877/MD-MT877C The unit may have the following symptoms while

42、 recording or editing. The unit is not out of order. MiniDisc System Limitations SYMPTOM “DISC FULL” or “TOC FULL” appears even though the MiniDisc still has re- cording time left. The remaining recording time does not increase even though you erased tracks. The total of the recorded time and the remaining time does not match the maxi- mum recordable time. Combine function does not work. Sound skips in fast reverse/forward. A track number is created in the mi