Technics-SJHD-501-Service-Manual电路原理图.pdf

ORDER No.AD9907180C2 Mini Disc Deck SJ-HD501 Mechanism unit: MR3A (RAJ3402) Mechanism Series Colour (N).Gold Type Areas EG.Europe. EB.Great Britain. This product is option for systems of SC-HD301 and SC-HD501. SPECIFICATIONS 1 Specifications SystemMinidisc digital audio system RecordingMagnetic field modulation direct overwrite ReadingNon-contact optical system with Semiconductor laser (=780nm) Sampling frequency: 44.1 kHz Cording system:ATRAC Channel:2channel, stereo Frequency response: 10-20000Hz (0.3dB) S/N Ratio (PLAY):90dB Wow and flutter:Below measurable limit Input Analog input (Level/impedance): 500mV/47k Digital input (Optical in 1, Optical in 2) Wavelength: 660nm Output Analog output (Level/impedance): 2.0V/600 General Dimensions (WxHxD): 196x104x237mm Weight:2.0kg Power supply:AC230-240V, 50Hz Power consumption: 12W Notes: 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. 1 2 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) 4 2. Precation of Laser Diode 5 3. Caution for AC Main Lead 4. Operating Instructions 5. 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 6 electrostatic 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. 1 7 5.2. Grounding for electrostatic breakdown prevention 1. 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. 2 6. Operation Checks and Main Component Replacement 8 Procedures 9 10 11 12 13 14 7. Self-Diagnostic Function This 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 Mode 1. 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 Mode 1. 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 Mode 1. 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.1 15 Fig.2 16 8. Self Check Function This 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 Function 1. 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.3 8.2. Checking the operation switches 1. 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.) 17 Fig.4 Fig.5 8.3. Checking the FL display 1. 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.6 18 Fig.7 The 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 transmitter 9.2. Set the Unit to the Adjustmint Mode 1. 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.8 20 Cautions 1. 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 head When 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 power Use 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 Procedure Note: 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.9 3. 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 22 mechanism. (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.10 Fig.11 23 4. 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 lower Fig.12 24 Caution: - 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): 4.80.1mW Caution: - 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 W 9. 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 W 25 - 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 Guide Please refer to this Troubleshooting Guide when you repair for any troubles of this unit. 26 27 28 29 30 31 32 33 11. Schematic Diagram Notes 11.1. Schemtic Diagram Notes This 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, 0dB Important 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 signal 11.2. Type Illustration of ICs, Transistors and Diodes 36 12. Schematic Diagram 13. Printed Circuit Board 14. Block Diagram 15. Wiring Connection Diagram 16. Terminal Function of ICs 16.1. IC1 (AN8772FHQ) : RF AMP 37 Pin No. MarkI/O Division Function 1CENVDD signal det. capacitor connection terminal 2LDOOLaser amp output terminal 3APCPDIPhoto diode light quantity det. input terminal 4LD INILaser amp reverse input terminal 5APC REFIAPC amp criterion voltage input terminal 6TEMP INITemperature sensor amp input terminal 7TEMPOTemperature sensor amp output terminal 8ADIPOADIP signal output terminal 9TOFSITracking error offset adjustment terminal 10TBALITracking ballance adjustment terminal 11TEOTracking error signal output terminal 12CRS INITrack cross input terminal 13TGAINITracking gain adjustment input terminal 14LNPOLens position signal output terminal 15AB GAINIAPP compensation signal gain adjustment terminal 16FEOFocus error signal output terminal 17AS GAINIAS gain adjustment terminal 18FBALIFocus ballance adjustment terminal 19AS/ MON3T OAS/3TMON signal output terminal 20CEAI3T envelope det. capacitor connection terminal 21BDO/ TRCRS OBDO/Track cross signal output terminal 22CBD OOBDO detection capacitor connection terminal 23OFT OOOff track detection signal output terminal 24GNDGND terminal 25OFT INIOff track detection signal input terminal 38 Pin No. MarkI/O Division Function 26VCCIPower supply terminal (+3V) 27 NRFDET/ OFTR ONRFDET/off track signal output terminal 28NRFLDISerial command latch signal input terminal 29RF DATAISerial command data signal input terminal 30RFCKISerial command clock input terminal 31 NRFSTBY IStandby control signal input terminal 32OUT RFOEFM signal output terminal 33CRF