Technics-SJHD501-md-sm 维修电路原理图.pdf

ORDER No.AD9907180C2Mini Disc DeckSJ-HD501Mechanism unit: MR3A (RAJ3402) Mechanism SeriesColour(N).Gold TypeAreasEG.Europe.EB.Great Britain.This product is option for systems of SC-HD301 andSC-HD501.SPECIFICATIONS1RadioFans.CN 收音机爱 好者资料库SpecificationsSystemMinidisc digital audio systemRecordingMagnetic field modulation direct overwriteReadingNon-contact optical system with Semiconductor laser (=780nm)Sampling frequency:44.1 kHzCording system:ATRACChannel:2channel, stereoFrequency response:10-20000Hz (0.3dB)S/N Ratio (PLAY):90dBWow and flutter:Below measurable limitInputAnalog input (Level/impedance): 500mV/47k Digital input (Optical in 1, Optical in 2)Wavelength: 660nmOutputAnalog output (Level/impedance): 2.0V/600 GeneralDimensions (WxHxD):196x104x237mmWeight:2.0kgPower supply:AC230-240V, 50HzPower consumption:12WNotes:1.Design and specifications are subject to change without notice.2.Dimensions and weight are approximate.3.Total harmonic distortion is measured by the digital spectrum analyzer.12RadioFans.CN 收音机爱 好者资料库1. Accessories- AC power supply cord.1pc.- Optical cable.1pc.(RJL1X001B05D)3- Remote control batteries.2pcs.R6/LR6 (AA, UM-3) Note:These are available on sales route.- Stereo phono cables.2pcs.(RJL2P004B08)- Remote control transmitter.1pc.(EUR645272)42. Precation of Laser Diode53. Caution for AC Main Lead4. Operating Instructions5. Handling Precautions for Traverse Deck (MD Unit)The laser diode in the MD unit (optical pickup) may break down due to potential difference caused by static electricity of clothes or human body.So, be careful of 6electrostatic breakdown during repair of the MD unit (optical pickup).5.1. Handling of MD Unit (optical pickup)1. Do not subject the MD unit (optical pickup) to static electricity as it is extremely sensitive to electrical shock.2. The short land between the No. 25 (LD-GND) and No. 24 (LD) pins on the flexible board is shorted with a solder build-up to prevent damage to the laser diode. (As shown in Fig. 1.) To connect to the PC board, be sure to open by removing the solder build-up, and finish the work quickly.3. Take care not to apply excessive stress to the flexible board (FFC).4. Do not turn the variable resistor (laser power adjustment). It has already been adjusted. Fig. 175.2. Grounding for electrostatic breakdown prevention1. Human body grounding Use the anti-static wrist strap to discharge the static electricity from your body. (As shown in Fig. 2.)2. Work table grounding Put a conductive material (sheet) or steel sheet on the area where the optical pickup is placed, and ground the sheet.Caution:The static electricity of your clothes will not be grounded through the wrist strap. So, take care not to let your clothes touch the traverse deck (optical pickup).Fig. 26. Operation Checks and Main Component Replacement 8Procedures910111213147. Self-Diagnostic FunctionThis unit is equipped with a self-diagnostic function which, in the event of a malfunction, automatically display a code indicating the nature of the malfunction. Use this self-diagnostic function when servicing the unit.7.1. Switching to the Self-Diagnostic Mode1. Turn the power on.2. Press and hold the STOP button for at least 2 seconds, and while still pressing the STOP button, press the FWD SEARCH button for at least 2 seconds. (Refer to Fig.1.) The unit enters Self-Diagnostic Mode and is displayed “MD TEST”. Then an error code is displayed, if any. For details of the error codes, refer to Fig.2. In the case of no errors, “-” is displayed on FL.3. If more than one error exists, the display will sequentially show the respective error codes each time the FWD SEARCH button is pressed.7.2. Canceling the Self-Diagnostic Mode1. The Self-Diagnostic Mode can be canceled by pressing the POWER button (POWER) to turn the system off. And then pressing the power button again to turn it again.7.3. Clearing the Self-Diagnostic Mode1. The contents of abnormality display are stored in memory. In order to clear the memory, continue to press the STOP button for at least 5 seconds while in the Self-Diagnostic Mode. The memory will clear. Always be sure to clear this memory after completing repair.Fig.115Fig.2168. Self Check FunctionThis unit is equipped with a self check function which can detect a part of malfunction. Use this function before servicing the unit and check the item as shown below.8.1. Setting to the Self Check Function1. Turn the power on.2. Press and hold the STOP button for at least 2 seconds, and while still pressing the STOP button, press the REV. SEARCH button for at least 2 seconds. Then the unit enters Self Check Function. (Refer to Fig.3.)Fig.38.2. Checking the operation switches1. When the unit enters the Self Check Function, the FL display turn off.2. Press the buttons on the unit except the INPUT SELECTOR button, it displays “-” mark adapted each buttons.(Fig.4 and Fig.5 is shown about a allotment.)17Fig.4Fig.58.3. Checking the FL display1. Press the INPUT SELECTOR button.2. All buttons works normally except the POWER button, FL display and LED turns on and off at 0.5 second interval.(Refer to Fig.6 and Fig.7.)Fig.618Fig.7The Self Check Function can be canceled by pressing and holding the STOP button for at least 2 seconds.9. Measurements and Adjustments (Laser Power Adjustment)Note:- If you exchange parts of MD unit when you repair, you must perform the Laser Power adjustment.19- Because this unit uses the optical magnetic recording, the unit outputs over 10 times more laser than a CD player does. In the adjustment mode, the laser is always being output. Therefore, be especially careful not to look laser beam directly or to touch the laser beam when adjusting the unit and checking its operation.9.1. Necessary Instruments- Laser power meter (LE8010) or cartridge type laser power meter- Test disc (Pre-mastered disc RFKV0006 or RFKV0014)- Recordable disc available on sales route (with music recorded)- Insulated driver for adjustment such as a ceramic driver- Remote control transmitter9.2. Set the Unit to the Adjustmint Mode1. Supply power to the unit.2. With no MD loaded in the player, simultaneously press the STOP button and the FWD. SEARCH button and hold them both pressed for at least 2 seconds until “MD TEST” appears in the display. (Refer to Fig.8.)3. At the Self-Diagnostic Mode, press “1” on the players remote control. “RAM LASER” will be displayed to indicate the read power adjustment mode.Fig.820Cautions1. About handling the MD unit- The magnetic head is a precision unit and is very fragile. Do not deform it.- Laser diode in the optical pickup may be destroyed by the staticelectricity generated in your clothes or body. Be especially careful with the static electricity.- The optical pickup is structured extremely precisely. Do not subject to the strong impact or shock. Do not touch the lens.2. About handling the magnetic headWhen replacing the magnetic head, do not tighten the mounting screw (RHD17022) too firmly. If the screw is tightened too much to deform the resin, the position of the head is moved, and this affects its recording operation.Recommended torque for mounting screw: 700 g cm +/- 100 g cm Reference: This is the same force as using a screwdriver with a 15-mm diameter grip, you fasten the screw naturally with your thumb and index finger.3. About the driver for adjusting laser powerUse only insulated driver such as a ceramic driver. With the metal driver, it is not possible to adjust properly because of the induction noise. Also, if it short-circuits with the chassis, it may destroy or damage the laser diode.Recommended driver: VESSEL 9000 1.8 -30 (Ceramic driver)Cautions on optical pickup:21- The optical pickup and the magnetic head are structured precisely; therefore, they are very fragile. Be careful not to touch them with the edge of the laser power meter.- The sensor of the laser power meter is a very fine part. Be careful not to touch it to the optical pickup lens.- The focus point of the laser reaches to 356F. Therefore, avoid adjusting using laser power for a long time because the sensor of the laser power meter may be burned.- Do not allow the write power to even momentarily reach or exceed 5.5 mW. Doing so will result in damage to the optical pickup.- Do not set the unit to the laser power adjustment mode with the MD loaded. Doing so may result in damage to the MD.9.3. Adjustment ProcedureNote:There are two methods of adjusting the player, either by using a laser power meter or by using a cartridge type laser power meter.1. EntertheAdjustmentMode.2. If using a laser power meter, slide open the sensor cover. (Refer to Fig.9.)Fig.93. If using a laser power meter, position the sensor directly above the optical pickup. (Refer to Fig.10.)If using a cartridge type laser power meter, load the cartridge into the MD 22mechanism. (Refer to Fig.11.)Caution:Do not allow the laser power meter to come in contact with either the optical pickup or the magnetic head.Fig.10Fig.11234. Confirm that the reading of the laser power meter or cartridge type laser power meter is within the specified. If it is not within the specified range, adjust by turning VR1. (Refer to Fig.12.)Specified range (read power): 600 W or lowerFig.1224Caution:- Proceeding on to the subsequent adjustment procedure with the read power exceeding 680 W will result in damage to the optical pickup.5. Press “2” on the players remote control.“WRITE LASER” will be displayed to indicate the write power adjustment mode.6. Confirm that the reading of the laser power meter or cartridge type laser power meter is within the specified range. If it is not within the specified range, adjust by turning VR1. (Refer to Fig.12.)Specified range (write power): 4.80.1mWCaution:- Do not allow the write power to even momentarily reach or exceed 5.5mW. Doing so will result in damage to the optical pickup.7. Press “3” on the players remote control.“ROM LASER” will be displayed to indicate the ROM data confirmation mode.8. Confirm that the reading of the laser power meter or cartridge type laser power meter is within the specified range.Specified range (ROM data laser power): 540-660 W9. Press “1” on the players remote control.“RAM LASER” will be displayed to indicate the RAM data confirmation.10. Confirm that the reading of the laser power meter or cartridge type laser meter is within the specified range.Specified range (RAM data laser power): 540-660 W25- If the reading in either step 8 or 10 above is not within the specified range, first switch off the power, and then reset the unit to the adjustment mode and repeat the adjustment procedure.10. Troubleshooting GuidePlease refer to this Troubleshooting Guide when you repair for any troubles of this unit.262728293031323311. Schematic Diagram Notes11.1. Schemtic Diagram NotesThis schematic diagram may be modified at any time with the development of new technology.Notes:- S1 : PROTECT det. switch.34- S2 : REFLECT det. switch.- S3 : LOAD OPEN det. switch.- S4 : DISC IN det. switch.- S5 : LOAD PLAY/REC det. switch.- S6 : LOAD PLAY det. switch.- S7 : LOAD TRG det. switch.- S8 : Traverse det. switch.- S901 : Standby/on () switch.- S902 : Input selector (INPUT SELECTOR) switch.- S903 : Skip/Search () switch.- S904 : Skip/Search () switch.- S905 : Edit (EDIT) switch.- S906 : Enter (ENTER) switch.- S907 : Track mark mode select/character skip (TRACK MARKING/CHARA SKIP).- S908 : Display mode select/character (DISP/CHARA).- S909 : Eject ( EJECT) switch.- S910 : Stop ( ) switch.- S911 : Playback/Recording start () switch.- S912 : Record ( REC) switch.- S913 : Pause () switch.- S914 : Synchro-record (SYNCHRO REC) switch.- S915 : Playback mode (PLAY MODE) switch.35- VR1: Laser power adj. V.R.- VR901 : Input level/Jog push set V.R.- Indicated voltage values are the standard values for the unit measured by the DC electronic circuit tester (high-impedance) with the chassis taken as standard. Therefore, there may exist some errors in the voltage values, depending on the internal impedance of the DC circuit tester.No mark: MD STOP( ): MD play 1kHz, L+R, 0dB: MD rec. 1kHz, L+R, 0dBImportant safety notice:Components identified by mark have special characteristics important for safety.Furthermore, special parts which have purpose of fire-retardant (resistors), high-quality sound (capacitors), low-noise (resistors), etc. are used. When replacing any of components, be sure to use only manufactures specified parts shown in the parts list.Caution!IC and LSI are sensitive to static electricity.Secondary trouble can be prevented by taking care during repair.Cover the parts boxes made of plastics with aluminum foil.Ground the soldering iron.Put a conductive mat on the work table.Do not touch the legs of IC or LSI with the fingers directly.Voltage and signal lines: Positive voltage line: Playback signal: Recording signal11.2. Type Illustration of ICs, Transistors and Diodes3612. Schematic Diagram13. Printed Circuit Board14. Block Diagram15. Wiring Connection Diagram16. Terminal Function of ICs16.1. IC1 (AN8772FHQ) : RF AMP37Pin No.MarkI/O DivisionFunction1CENVDD signal det. capacitor connection terminal2LDOOLaser amp output terminal3APCPDIPhoto diode light quantity det. input terminal4LD INILaser amp reverse input terminal5APC REFIAPC amp criterion voltage input terminal6TEMP INITemperature sensor amp input terminal7TEMPOTemperature sensor amp output terminal8ADIPOADIP signal output terminal9TOFSITracking error offset adjustment terminal10TBALITracking ballance adjustment terminal11TEOTracking error signal output terminal12CRS INITrack cross input terminal13TGAINITracking gain adjustment input terminal14LNPOLens position signal output terminal15AB GAINIAPP compensation signal gain adjustment terminal16FEOFocus error signal output terminal17AS GAINIAS gain adjustment terminal18FBALIFocus ballance adjustment terminal19AS/ MON3TOAS/3TMON signal output terminal20CEAI3T envelope det. capacitor connection terminal21BDO/ TRCRSOBDO/Track cross signal output terminal22CBD OOBDO detection capacitor connection terminal23OFT OOOff track detection signal output terminal24GNDGND terminal25OFT INIOff track detection signal input terminal38Pin No.MarkI/O DivisionFunction26VCCIPower supply terminal (+3V)27NRFDET/ OFTRONRFDET/off track signal output terminal28NRFLDISerial command latch signal input terminal29RF DATAISerial command data signal input terminal30RFCKISerial command clock input terminal31NRFSTBYIStandby control signal input terminal32OUT RFOEFM signal output terminal33CRF AGCRFAGC capacitor connection terminal34EQ INIEQ input terminal35ARFOORF amp. output terminal36SVREFIReference voltage input terminal37VREFOReference voltage output terminal38RF1IRF1 signal input terminal39RF2IRF2 signal input terminal40F1IF1 signal input terminal41F2IF2 signal input terminal42CLPF1APP compensation LPF capacitor connection terminal43CLPF2RF equalizer adjustment resistor connection terminal4447ADIBeam AD signal input terminal48CENVCBe