Aiwa Md-Cd Stereo System Lcx-Md211 Parts & Service 电路图.pdf

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3、?#-%?1$?-0$?+-)4$1 +.-%?%?#.$?18.#?68(1$? ? Solder RadioFans.CN 收音机爱 好者资料库 ? CN403CN405 ? ? ? ? ?!?!?!?!? !?#?!?!?!? ?!?$?%? ? ? OFF Indication on display LASER 1/2 WRITE Mode LASER READ LASER WRITE ALL SVOFF LA READ LA 1/2 LA WRITE 2) Press s button to return the display to ALL SVOFF after checking

4、. 1-7 Checking OWH (Over Write Head) Operation The operation of OWH can be checked by pressing following buttons in the loading status. MD EJECT button-OWH UP SYNCHRO REC button-OWH DOWN * Note: Do not down OWH when using the high reflection disc (CD). 1-8 Checking Servo Operation Checking the focus

5、 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 PROTECT Switch state REFRECT When the high reflection disc (CD) is used. TOC EDIT Switch nameIndication on DisplayUsalde di

6、sc MD REC INNER MONO Playback only disc When the write-protection tab of disc is stopped. When the pickup is the positioned at the innermost track (when the LIMIT SW is ON). Record/playback disc 30 2) Press s button to display ALL SVOFF after checking Checking the focus search and spendle kick 2 1)

7、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

8、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 no

9、rmally, 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

10、are normal. 2) Press s button to display ALL SVOFF after checking. 31 ADJUSTMENT TP4 (VT)FFE801 L981 14 IC721 + + TP7(Rch) C786 TP8(Lch) C785 TP6TP5 2826 IC771 L772 L771 IC201 IC202 J201 MAIN C.BA L941L942 TC942 1.MW VT Check Settings : Test point : TP4 (VT) Method :Set to MW 1602kHz and check that

11、the test point is less than 5.6V. 2.MW Tracking Adjustment Settings : Test point : TP7 (RCH), TP8 (LCH) Adjustment location :L981 Method :Set to MW 999kHz and adjust L981so that the test point becomes maximum. 3.AM IF Adjustment Settings : Test point : TP7 (RCH), TP8 (LCH) Adjustment location: L772

12、. 450kHz 4.LW VT Adjustment Settings : Test point : TP4 (VT) Adjustment location :L942 Method :Set to LW 153kHz and adjust L942 so that the test point becomes 1.3V 0.05V. 5.LW Tracking Adjustment Settings : Test point : TP7 (RCH), TP8 (LCH) Adjustment location : L941 . 153kHz TC942. 285kHz Method :S

13、et up TC942 to center before adjustment. The level at 153kHz is adjusted to maxinum by L941. Then the level at 285kHz is adjusted to maxinum by TC942. 6.FM VT Check Settings : Test point : TP4 (VT) Method :Set to FM 108MHz and check that the test point is less than 8.2V .Then set to FM 87.5MHz and c

14、heck that the test poit is more than 1.5V. 7.FM Tracking Check Settings : Test point : TP7 (RCH), TP8 (LCH) Method :Set to FM 98MHz and check that the test point is less than 18dB. 8.DC Balance / Mono Distortion Adjustment Settings : Test point : TP5, TP6 (DC balance) TP7 (RCH), TP8(LCH)(Distortion)

15、 Adjustment location :L771 Input level : 54dB Method :Set to FM 98MHz and adjust L771 so that the voltage between TP3 and TP4 becomes 0V 0.04V. Next, check that the distortion is less than 1.5%. 9.FM Separation Check Settings : Test point : PHONE JACK (J201) Input level : 54dB Method :Set to FM 98MH

16、z and check that the test point is more than 20dB. 10. Head Azimuth Adjustment Settings : Test tape : TTA330 Test point : PHONE JACK (J201) Adjustment location :Head azimuth adjustment screw Method :1) Connect the L positive terminal to CH1 probe (positive side) of oscilloscope and L negative termin

17、al 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. 32 CD C.

18、B CN401 SFR430 TP (VREF) IC404 CN405 CN403 IC402 IC401 41 TP(RFSM) TP(TE) R405 C431 + 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 Adjustment Adjust focus bias when replaing or repairing the o

19、ptical 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 Adjustment 1) Con

20、nect 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. + _ Os

21、cilloscope (DC range) TP (RFSM) TP (VREF) + _ Oscilloscope (DC range) TP (TE) TP (VREF) EYE PATTERN must be CLEAR and MAX Max VOLT/DIV: 0.5V TIME/DIV: 0.5uS A B VOLT/DIV: 20mV TIME/DIV: 1mS A=B VREF 33 Perform 13 adjustment when display showing NO ADJUST. 1. Temperature Compensation Adjustment Test

22、point: Check on the display. Tool : Thermometer Adjustment procedure 1) 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 te

23、mperature. 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 val

24、ue 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 this adjustment if it is not possible to measure the room temperature. 2. Laser Power Adjustment Test point: P

25、ickup laser output Tool : Laser power meter Adjustment procedure 1) Starting in the ALL SVOFF status, press EDIT button three times to change the display to LA WRITE. 2) Press T-BASS button once and change the display to LASER = *. 3) Measure the laser output of pickup with the laser power meter and

26、 adjust output by g or f buttons so that the measurement value becomes 6.8mW 0.03mW. Press ENTER button after adjusting. 4) Press s button to display ALL SVOFF after adjusting. Caution: There is a possibility that pickup may be damaged if laser output exceeds 7.0mW. 3.Auto Sequence Adjustment (EFB/I

27、VR/FOCUS AGC/TRACKING AGC adjustment) Test disc: MDW-60, TGYS-1 Adjustment MO disc 1) Insert the MDW-60 test disc. 2) Press s button to display ALL SVOFF. 3) Press JOG MODE button to display SEL GRV. 4) When pressing MD function button, AUTO ADJ is displayed and adjustment start. After adjusting, DO

28、NE is displayed. (If FAILED is displayed, the adjustment failed.) 5) Press s button to display ALL SVOFF. NOTE: 1.As there is a posibility that adjustment may not be able to adequately performed if the disc is dirty or scratched, make sure to keep the disc clean. 2.When using a MO disc, one section

29、will be erased in order to change it to WRITE POWER, so a special disc is to be used. Checking for IVR, EFB and focus/tracking/sled gain of MO disc 1) Move the pickup to the center track using g or f buttons. 2) Press E button to display FOCUS ON. 3) Press ENTER button to switch the mode to ALL SV O

30、N. 4) Press s button and DISPLAY button twice. S S S S S S Then, confirm the values of I * E in the display are within the following range. * . 040A . 0915 5) Press DISPLAY button again. Confirm the values of F * T # S I I in the display are within the following range. * . 1A45 # . 0003 I I . 0003 6

31、) Press s button to display ALL SVOFF. Adjustment for PIT disc 1) Insert the TGYS-1 test disc. 2) Press s button to display ALL SVOFF. 3) Press JOG MODE button to display SEL PIT. 4) When pressing MD function button, AUTO ADJ is displayed and adjustment start. After adjusting, DONE is displayed. (If

32、 failed is displayed, the adjustment failed.) 5) Press s button to display ALL SVOFF. Checking IVR, EFB and focus/tracking/sled gain of PIT disc Perform the same procedures as for MO disc and check that the display is within the range below; IVR.1419 EFB.0915 FOCUS GAIN.1A45 Tracking gain.003F Sled

33、gain.003F 4. Checking Error Rate (PIT disc) 1) Insert the TGYS-1 test disc. 2) Move the pickup to the center track using g or f buttons. 3) Press JOG MODE button to display SEL PIT. 4) Press E button to display FOCUS ON. 5) Press ENTER button to switch the mode to AL SV ON. Then press DISPLAY button

34、 twice to display 00 * 000. 6) Check the value of * is below 30 at this time. 7) Press s button to display ALL SVOFF. 5. Checking Record/Playback Error Rate (MO disc) 1) Insert the MDW-60 test disc. 2) Move the pickup to the center track using g or f buttons. 3) Press JOG MODE button to display SEL

35、GRV. 4) Press MD REC button to display R ANALOG. 5) Press E button to display FOCUS ON. 6) After displaying ALL SV ON by pressing ENTER button, press SYNCRO REC button. 7) Recording begins after OWH has moved when MD REC button is pressed once again. At this time, display will change from ALL SV ON

36、to A0600C # S. 8) Press s button after recording has progressed for about 15 seconds, changing the display to ALL SVOFF. 9) Press MD EJECT button to raise the OWH. 10) Press E button to display FOCUS ON. 11) Once ALL SV ON has been displayed by pressing ENTER button, press DISPLAY button to display

37、A * C # S. After * reaching 600, press DISPLAY button once again to display 00 / 000. Check that the value of / is below than 20 at this time. 34 12) Press s button to display ALL SVOFF. 6. UTOC Erase To be performed only when erasure is needed with disc that have already been recorded upon. 1) Inse

38、rt the disc that is to be used to erase the UTOC. 2) Move the pickup to the center track using g or f buttons. 3) Press JOG MODE button to display SEL GRV. 4) Press MD REC button to display R ANALOG. 5) Press E button to display FOCUS ON. 6) Press ENTER button to display ALL SV ON. 7) Press MD REC b

39、utton for move than one second continuously, UTOC ERASE will be displayed and UTOC erased. 8) Once the UTOC has been erased, ALL SVOFF will be displayed. 7. EEP-ROM Initialization * Initialize adjusted values in the EEP-ROM to default values as following steps. * Perform 13 adjustment after initiali

40、zed EEP-ROM. 1) Press CLOCK/TIMER button. 2) Press POWER button and confirm display is shown NO Adjust. NOTE: MD operation is able to work in the NO Adjust status. ?35? ? ? ? ? ? ? ? ? ?!#$% adding this pin to pin FIN1 generates RF signal, and subtracting it generates FE signal. 2FIN1IConnect to the

41、 pickups photo diode. 3EIConnect to the pickups photo diode; subtracting this pin from pin F generates TE signal. 4FIConnect to the pickups photo diode. 5TBIInput for DC component of TE signal. 6TEIConnect to the resistor between this pin and TE pin for setting the gain of TE signal. 7TEOOutput for

42、TE signal. 8TESIIInput for TES (Track Error Sense) comparator, TE signal is band-passed and inputted. 9SCIIInput for shock detection. 10THIFor setting tracking gain time constant. 11TAOTA amplifier output pin. 12TDIFor constructing tracking phase compensation constant between TD and VR pins. 13TDOFo

43、r setting tracking phase compensation. 14JPIFor setting the amplifier of tracking jump signal (kick pulse). 15TOOOutput for tracking control signal. 16FDOOutput for focusing control signal. 17FDIFor constructing focusing phase compensation constant between FD and FA pins. 18FAOFor constructing focus

44、ing phase compensation constant between FD and FA pins. 19FAIFor constructing focusing phase compensation constant between FA and FE pins. 20FEOOutput for FE signal. 21FEIConnect to the gain-setting resistor of FE signal between this pin and FE pin. 22AGNDGND for analog signals. 23SPOSingle end output of CV+ and CV pin input signal. 24SPIIInput