Aiwa-LCXMD211-cs-sm维修电路原理图.pdf

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In this case, the power supply should be switched off for ten minutes until heat has been reduced and then re-start.1-3 How to cancel CD Test ModeEither one of the following operations will cancel the CD test mode. Open the CD door switch. Press POWER button. Disconnect the AC plug.LCD TEST MODE1-1 How to activate LCD Test ModeInsert the AC plug while pressing the DISPLAY button.LCD display is fully illuminated and then all segments are lit on and off every one second.1-2 How to cancel LCD Test ModeLCD test mode will cancel by press POWER button or disconnect the plug.Start Mode DisplaySearch ModeContinuous Focus Search (Pickup lensrepeat full swing)* Note 1Activate CDTest ModeCD TEST FunctionModeOperationContentSEARCHPlay ModePLAY Normal Playback When TOC READ is unavailable, continuous Focus Search (Same as Search Mode Operation) Focus servo Tracking servo CLV servo Sled servoTraverse ModeTRAVERSTuner FunctionButtonPlayback pause statusTracking servo OFFSled ModeSLED INSLED OUT Shift to the internal circumference of pickup Shft to the external circumference of pickup Sled servo Mecha operation checksEgf APC circuit check Laser current measurement Focus error waveform checkRadioFans.CN 收音机爱 好者资料库 29 MD TEST MODE1-1 How to start up MD Test ModeInsert the AC plug while pressing the MD function button.After the MD test mode has started up, MD TEST message appears and the test mode becomes operatable.Note: Disconnect the AC plug immediately if any mechanism abnormalities. Playback and recording are not possible during the test mode.1-2 How to cancel MD Test Mode1) Press the MD EJECT button and remove the disc.2) Disconnect the AC plug or press POWER button.1-3 Operation Check Mode1) Checks after the test mode has started up. The following playback audio circuits can be checked. Enable circuit to check - DAC, LINEAMP, HEADPHONE AMP Output level - 1KHz, -24dB2) Switch status check ON/OFF statuses of main unit and mechanism switches can be checked on display.1-4 How to switch to Servo Standby ModeWhen the test mode has been established, the mode changes to the servo standby mode by pressing s button (lndication on display : ALLSVOFF).The various check modes can be entered from this mode.Pressing the s button during each operation returns to ALL SVOFF.1-5 Checking Sled Operation1) When g button is pressed in the ALL SVOFF state, pickup moves in the outer direction. T SLEDFWD is displayed.2) When g button is pressed in the ALL SVOFF state, pickup moves in the inner direction. T SLEDRVS is displayed.1-6 Checking Laser Power1) The laser power is switched each time the EDIT button is pressed in the ALL SVOFF state. Laser power output is changed as OFFbLASER READbLASER 1/2bLASER WRITEbOFF order and indication on the display is follows;OFFIndication on displayLASER 1/2 WRITEModeLASER READLASER WRITEALL SVOFFLA READLA 1/2LA WRITE2) Press s button to return the display to ALL SVOFF after checking.1-7 Checking OWH (Over Write Head) OperationThe operation of OWH can be checked by pressing following buttons in the loading status.MD EJECT button-OWH UPSYNCHRO REC button-OWH DOWN* Note: Do not down OWH when using the high reflection disc (CD).1-8 Checking Servo Operation Checking the focus search and spindle kick 1 1) When E button is pressed in the ALL SVOFF state without disc, focus search and spindle kick are executed continuously. FOCUS SCH is displayed.REC PROTECTSwitch stateREFRECTWhen the high reflection disc (CD) isused.TOC EDITSwitch nameIndication on DisplayUsalde discMD RECINNERMONOPlayback only discWhen the write-protection tab of disc isstopped.When the pickup is the positioned at theinnermost track (when the LIMIT SW isON). Record/playback discRadioFans.CN 收音机爱 好者资料库 30 2) Press s button to display ALL SVOFF after checking Checking the focus search and spendle kick 2 1) When TUNER function button is pressed in the ALL SVOFF state regardless disc existence, focus search and spindle kick are executed continuously. FOCUS CHK is displayed and S curve can be checked if disc is loaded. 2) Press s button to display ALL SVOFF after checking. Checking Focus Servo 1) Insert a test disc. 2) Move pickup to center track by pressing g or f buttons. 3) Press JOG MODE button to set the servo mode according to the inserted disc as follows; MO disc (MO)-Indication on display SEL GRV. PIT disc (CD)-Indication on display SEL PIT. 4) Press E button. If focus servo is operating normally, the messge FOCUS ON is displayed after FOCUS SCH. 5) Press s button to display ALL SVOFF after checking. Checking all Servos are turned on. 1) Tracking and sled servos and turned on and all servos work when ENTER button is pressed in the FOCUS ON! state. ALL SV ON is displayed if all servos are normal. 2) Press s button to display ALL SVOFF after checking.RadioFans.CN 收音机爱 好者资料库 31 ADJUSTMENT TP4 (VT)FFE801L98114IC721+TP7(Rch)C786TP8(Lch)C785TP6TP52826IC771L772L771IC201IC202J201MAIN C.BAL941L942TC9421.MW VT CheckSettings : Test point : TP4 (VT)Method :Set to MW 1602kHz and check that the test point isless than 5.6V.2.MW Tracking AdjustmentSettings : Test point : TP7 (RCH), TP8 (LCH) Adjustment location :L981Method :Set to MW 999kHz and adjust L981so that the testpoint becomes maximum.3.AM IF AdjustmentSettings : Test point : TP7 (RCH), TP8 (LCH) Adjustment location:L772 . 450kHz4.LW VT AdjustmentSettings : Test point : TP4 (VT) Adjustment location :L942Method :Set to LW 153kHz and adjust L942 so that the testpoint becomes 1.3V 0.05V.5.LW Tracking AdjustmentSettings : Test point : TP7 (RCH), TP8 (LCH) Adjustment location :L941 . 153kHzTC942. 285kHzMethod :Set up TC942 to center before adjustment. The level at153kHz is adjusted to maxinum by L941. Then thelevel at 285kHz is adjusted to maxinum by TC942.6.FM VT CheckSettings : Test point : TP4 (VT)Method :Set to FM 108MHz and check that the test point is lessthan 8.2V .Then set to FM 87.5MHz and check thatthe test poit is more than 1.5V.7.FM Tracking CheckSettings : Test point : TP7 (RCH), TP8 (LCH)Method :Set to FM 98MHz and check that the test point is lessthan 18dB.8.DC Balance / Mono Distortion AdjustmentSettings : Test point : TP5, TP6 (DC balance) TP7 (RCH), TP8(LCH)(Distortion) Adjustment location :L771 Input level : 54dBMethod :Set to FM 98MHz and adjust L771 so that the voltagebetween TP3 and TP4 becomes 0V 0.04V.Next, check that the distortion is less than 1.5%.9.FM Separation CheckSettings : Test point : PHONE JACK (J201) Input level : 54dBMethod :Set to FM 98MHz and check that the test point is morethan 20dB.10. Head Azimuth AdjustmentSettings : Test tape : TTA330 Test point : PHONE JACK (J201) Adjustment location :Head azimuthadjustment screwMethod :1) Connect the L positive terminal to CH1 probe (positive side) of oscilloscope and L negative terminal to CH1 probe (negative side). Connect the R positive and negative terminals to CH2 probe same condition as CH1 probe.2) Play back the 10kHz signal of the test tape.3) Adjust the head azimuth adjustment screw to become maximum waveform in the oscilloscope and same phase for CH1 and CH2.RadioFans.CN 收音机爱 好者资料库 32 CD C.BCN401SFR430TP(VREF)IC404CN405CN403IC402IC40141TP(RFSM)TP(TE)R405C431+Note: Connect a provbe (10 : 1) of the oscilloscope to adjust. Connect negative side of the oscilloscope to TP (VREF) for each adjustment.1. Focus Bias AdjustmentAdjust focus bias when replaing or repairing the optical block.1) Connect an oscilloscope to the test points TP (RFSM) and TP(VREF).2) Turn on the POWER button.3) Insert the test disc TCD-782 (YEDS-18) and playack the 2nd composition.4) Adjust SFR430 so that RF signal of the test point is MAX and CLEARREST.2. Tracking Balance Adjustment1) Connect an oscilloscope to the test point TP (TE) and TP (VREF).2) Active the CD test mode.3) Insert the test disc TCD-782 (YEDS-18) and choose traverse mode of CD test mode.4) Check that the waveform of traverse is vertically symmetrical as shown below.5) Cancel CD test mode after checking.+_Oscilloscope (DC range)TP (RFSM)TP (VREF)+_Oscilloscope (DC range)TP (TE)TP (VREF) EYE PATTERNmust be CLEAR and MAXMaxVOLT/DIV: 0.5VTIME/DIV: 0.5uSABVOLT/DIV: 20mVTIME/DIV: 1mSA=BVREFRadioFans.CN 收音机爱 好者资料库 33 Perform 13 adjustment when display showing NO ADJUST.1. Temperature Compensation Adjustment Test point: Check on the display. Tool : Thermometer Adjustment procedure1) After MD test mode has started up, press s button to display ALL SVOFF.2) Press DISPLAY button to display TEMP = .3) Press T-BASS button to display T + * C #.4) Put the thermometer near the MD mechanism to measure the room temperature.5) Adjust the indication value * using l and j buttons until the value is the same as room temperature. Press ENTER button after adjusting.6) Ptess s button to display ALL SVOFF after adjusting.7) After adjustment is completed, once again set the display to TMP + * C # and check the value that has been caluculated with the addition or subtraction of the numerical values of # in relation to the * value. This value is to be the same sa room temperature. NOTE: Do not perform