Sanyo MCD-Z250F Service Manual

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REPLACEMENT OF CD MECHANISMf. Resetting the pickup to the home position(1) The limit switch is switched ON by the projection of this rackgear secured to the relurned pickup, atter which the sled motorcontinues to operate (by the circuit) for approximately 30 msec.: There is then again a reverse operation, and movement tothe position at which the switch k swffched OFF.(2) Rotation continues during about 30 msec, after the switch isswitched OFF. And then the pickup stops at home position.cri4 ‘CM5 C;4 CM5CONFIRM OF CD SECTIONa. Preparation. Measuring instruments and Test disc.(1) Test Disc : YEDS 18 (SONY)(2) Oscilloscope: SS5711 (10 MHz and Dual Phenomenon)NOTE : CD section of this unit can not need adjustment, because CD P.W.Board checked at automatic checker.b. Confirm of general operation(1) Set the test disc.(2) Press the PLAY button, then confirm the disc ro!aling to clockwise direction.(3) Press the SKIP/SEARCH button, then confirm the most inner music or most outer music accessing at speedy.(4) Press the STOP button.c. Confirm of eye pattern +~(1)(2)(3)(4)Connect an oscilloscope to RF(=IC101 pin41 (H)) and VR RF ~(J1315).Set the test disc, press the PLAY button.Check to be sure that the “eye” pattern “isat center of waveform VR ~and that the diamond shape is clearly defined.—Press the STOP button.TUNER ADJUSTMENTS. Use a plastic screw driver for adjustments.. Adjust the intermediate frequency of AM and FM to the frequency of ceramic filter.Supply voltage : DC 12.OVPhones impedance : 32 ohmsFunction switch : RADIOa. Parts Location TP2 TP3 1P12 1P6p-y ~L2102 C20CNElL2204EnXF213o@3 L2002 4J21011P 1b. AM Adjustment BAND SELECT SWITCH : AMStep AdjustingITuning Input Connection I Output Connection AdjustmentCircuit Frequency Measurement Input Measurement output Pa7fs VTVM Oscill1 AM Sweep VTVM TP8 (H)(45~kHz) 1000 kHz Generator ‘oop ‘NT Oscilloscope TP7 (E) XF213 A(Non-adiuslm.2 Tuning 520 kHz Digital TP6 (H) 12204 1.o&o.05vCoverage— —3 1710 kHz Voftme!er TP12 (E) _ Confirm 3.8 *0OSCILLOSCOPE4 60fJ kHz AM Signal VTVM TPI O(L)TrackingL2102Generator ‘oop ‘NT Oscilloscope TP11 (R)5- Maximuml&O kHz TP9 (E) CT201DEDb-6.c. FM Adjustment BAND SELECT SWITCH : FM FM Dummy Antenna :75 ohm unbalaStep Adjusting Tuning Input Connection Output Connection AdjustmentCircuit Frequency Measurement Input Parts vTVM OscillMeasurement outputn1 FM Sweep TP2 (H) VTVM(1 O.#MHz) 98.1 MHz Generator TP3 (E) OscilloscO~2 Tuning 87.9 MHz DigitalCoverage— —3 107.9 MHz Voltmeter4t90.1 MHzTracking FM Signal TP1 (H) VTVM5 105.7 MHz Generator TP3 (E) Oscilloscope-7-