Jvc-SRMV-40-US-2-Service-Manual电路原理图.pdf

SERVICE MANUALCOPYRIGHT © 2006 Victor Company of Japan, LimitedNo.YD082B2006/3DVD VIDEO RECORDER preset to Channel 3 when shipped) 75 , unbalancedMemory backup time Approx. 5 secondsACCESSORIESProvided accessories RF cable, Audio cable, S-video cable, Infrared remote control unit, “AA“ battery × 2(No.YD082B)1-3About this service manualThis model is a model to whom the DVD drive unit and some parts are changed based on SR-MV40US.Since the way of recognizing is explained below, in the case of SR-MV40US2,please use this manual. In the case of SR-MV40US, please refer to another service manual (No.YD082 2005/10).OUTPUTVHF/UHFOUTPUTDVD DVD/VCR DVD/VCRINPUT L-1OPTICALDVDDVDINVCRLRDIGITALAUDIO OUTCOMPONENTVIDEO OUTVIDEOS VIDEO S VIDEOAUDIOVIDEOAUDIOPCM/STREAMLRVIDEOANT LOOP OUT TV OUTLR OUTCOAXIALYPBPRAUDIOS VIDEOREMOTE INHOW TO IDENTIFY MODELSHow to recognize from the appearance of the model concerned is written below.Please distinguish from several contents currently printed on the rating label of the left side on main body.The surface ofa rear panelMODEL NO.S, NO.MADE IN2BLANK : SR-MV40US 2 : SR-MV40US2MODEL NO.S, NO.MADE IN21-4 (No.YD082B)SECTION 1PRECAUTIONPlease refer to “DR-MV1SUS No.YD006“ about this section.(No.YD082B)1-5SECTION 2SPECIFIC SERVICE INSTRUCTIONSPlease refer to “DR-MV1SUS No.YD006“ about this section except a written item.2.1 DIFFERENT TABLE OF FEATUREThe following table indicates main different points between models DR-MV1SUS and SR-MV40US2.MODEL NAME DR-MV1SUS SR-MV40US2BODY COLOR PURE SILVER GRAYFRONT DOOR USED NOT USEDILLUMINATION COLOR USED(BLUE) NOT USEDVIDEO SYSTEM VHS S-VHSS-VHS ET NOT USED USEDSQPB USED NOT USEDTIME BASE CORRECTOR NOT USED USED3R PICTURE(DIGITAL or ANALOG) NOT USED USED3D DIGITAL Y/C SEPARATION NOT USED USED2MB FRAME MEMORY NOT USED USEDCABLE BOX CONTROLLER USED(OPTION) NOT USEDFRONT A/V INPUT CONNECTORS SILVER CONNECTORS GOLD CONNECTORSVIDEO OUTPUT CONNECTOR PIN JACK TYPE BNC TYPEREMOTE IN CONNECOTR NOT USED USEDVCR PLUS+ (DVD SIDE) VCR PLUS+C3 VCR PLUS+LAST FUNCTION MEMORY NOT USED USEDMODE LOCK NOT USED USED1-6 (No.YD082B)SECTION 3DISASSEMBLY3.1 Removing the major partsPlease refer to “DR-MV1SUS No.YD006“ about this section.3.2 DVD Drive unit section3.2.1 Remove the top cover and tray (See figure 1, figure2, figure3, figure4)(1) The part a on the reverse side of a DVD drive unit is madeto slide in the direction of an arrow. (A tray ejects a few.)(2) Remove the four screws A attaching the top cover.(3) Hooks b are removed, and the top cover is removed.(4) The tray is drawn out forward.(5) Remove the two screws B attaching the shaft guide, andhook c is removed.(6) It draws it out while lifting the tray in the direction of the ar-row.Fig.1Fig.2Fig.3Fig.4Part aAAAAHook bHook bTop coverBBHook cShaft guideTray(No.YD082B)1-73.2.2 Reassembly the tray (See figure 5)(1) The slide cam is done in the slide in the direction of the ar-row.(2) The shaft guide is done in the slide in the direction in theback.(3) The left side of the tray is inserted in the rail of the loadingbase, and the shaft guide is built in.(4) Please push the tray, and confirm whether the tray is nor-mally good to the close position at the slide by manual.Fig.53.2.3 Remove the traverse mechanism assembly (See figure 6, figure 7) Prior to performing the following procedure, remove the topcover, tray.(1) Disconnect the FFC wire from connector on the pick-upunit.ATTENTION: The laser diode of “pick-up“ might be destroyed by staticelectricity. Please work after installing the wristband. Inaddition, please do not touch in each part, the terminal,and the laser diode terminal on the substrate of the pick-up unit. Never(2) Disconnect the FFC wire from connector CN103, CN104on the servo control board.(3) Remove the four screws C attaching the traverse mecha-nism assembly.Fig.6Fig.7Slide camShaft guideCCCTraverse mechanism assemblyPick-up unitConnectorCN102CN103CN104CN105Hook d Hook dServo control boardD D1-8 (No.YD082B)3.2.4 Remove the servo control board (See figure 7)(1) Disconnect the FFC wire from connector CN102, CN103,CN104, CN105 on the servo control board.(2) Remove the two screws D attaching the servo controlboard.(3) Hooks d is removed, and the servo control board is re-moved.3.2.5 Remove the loading motor (See figure 8, figure 9) Prior to performing the following procedure, remove the topcover, tray.(1) Remove the solder part e soldered on the switch board.(2) A belt is removed.(3) Remove the two screws E attaching the loading motor.Fig.8Fig.9Part eSwitch boardLoadingmotorEBelt(No.YD082B)1-9SECTION 4ADJUSTMENT4.1 Before adjustmentPlease refer to “DR-MV1SUS No.YD006“ about this section.4.2 Electrical adjustment (VHS SECTION)Note:The following adjustment procedures are not only necessaryafter replacement of consumable mechanical parts or boardassemblies, but are also provided as references to be referredto when servicing the electrical circuitry. In case of trouble with the electrical circuitry, always begin aservice by identifying the defective points by using the measur-ing instruments as described in the following electrical adjust-ment procedures. After this, proceed to the repair,replacement and/or adjustment. If the required measuring in-struments are not available in the field, do not change the ad-justment parts (variable resistor, etc.) carelessly.4.2.1 Servo circuit4.2.1.1 Switching point (1) Play back the signal (A1) of the alignment tape (A2).(2) Apply the external trigger signal to D.FF (E) to observe theVIDEO OUT waveform and V.PB FM waveform at the measuring points (D1) and (D2).(3) Set the VCR to the manual tracking mode.(4) Adjust tracking so that the V.PB FM waveform becomes maximum.(5) Transmit the code (F) from the Jig RCU to adjust so that thetrigger point of the VIDEO OUT wavefome is changed fromthe trailing edge of the V.sync signal becomes the specifiedvalue (G).(6) Set the VCR to the stop mode.Fig.4-1a Switching point4.2.2 Video circuit4.2.2.1 EE Y/PB Y level(1) Input the signal (A3) from the input point (A1).(2) Set the VCR to the mode (B1).(3) Observe the Y OUT waveform at the measuring point (D).(4) Set the VCR to the EVR mode by transmitting the code (F1)from the Jig RCU.(5) Set the EVR address to (F2) by transmitting the code (F3)from the Jig RCU.(6) Transmit the code (F4) from the Jig RCU to adjust so thatthe Y level of the Y OUT waveform becomes the specifiedvalue (G).(7) Release the EVR mode of the VCR by transmitting thecode (F1) from the Jig RCU again. (When the EVR modeis released, the adjusted data is memorized.)(8) Input the signal (A3) from the input point (A2).(9) Repeat steps (3) to (7) in the mode (B1).(10) Record the signal (A3) in the mode (B2), and play back therecorded signal.(11) Set the VCR to the manual tracking mode.(12) Repeat steps (3) to (7) in the mode (B2).(13) Record the signal (A3) in the mode (B3), and play back therecorded signal.(14) Set the VCR to the manual tracking mode.(15) Repeat steps (3) to (7) in the mode (B3).Fig.4-1b EE Y/PB Y lebelSignal (A1)(A2) Stairstep signal Alignment tape(EP,stairstep,NTSC) MHP-LMode (B) PBEquipment (C) OscilloscopeMeasuring point (D) VIDEO OUT terminal (75 terminated) TP106 (PB. FM) External trigger (E) TP111 (D.FF) Adjustment part (F) Jig RCU: Code “43-51”or “43-52”Specified value (G) 8.0 ± 0.5HAdjustment tool (H) Jig RCU PTU94023BV.syncTrigger pointSwitching pointV. rateSignal (A1)(A2)(A3) Ext. S-input Ext. input Color (colour) bar signal NTSCMode (B1)(B2)(B3) EE SPS-VHS SPVHS SPEquipment (C) OscilloscopeMeasuring point (D) Y OUT terminal (75 terminated)EVR modeEVR address(F1)(F2)(F3)(F4) Jig code “43-57” A : 11 Jig code “43-21” twice Jig code “43-18” or “43-19” (Channel +/-)Specified value (G) 1.00 ± 0.05 Vp-pAdjustment tool (H) Jig RCU PTU94023BH. rateY level1-10 (No.YD082B)4.2.3 Audio circuitNote: GND (Ground) should be taken from the Tuner shieldcase.4.2.3.1 Audio REC FM(1) Apply the external trigger signal to D.FF (E) to observe theAudio PB FM waveform at the measuring point (D).(2) Record the signal (A3) with no audio signal input in themode (B), and play back the recorded signal.(3) Set the VCR to the manual tracking mode.(4) If the A.PB FM level is not within the specified value (G1),perform the adjustment in a following procedure.(5) Adjust the Adjustment part (F) so that the A. PB FM level ofthe higher channel level becomes the specified value (G1).(Adjust before recording, then confirm it by playing back.)(6) If the specified value (G1) is not obtained, adjust the Ad-justment part (F) so that the waveform level of the lowerchannel level becomes the specified value (G2). (Adjustbefore recording, then confirm it by playing back.)Fig.4-1c Audio REC FM4.3 Electrical adjustmentPlease refer to “DR-MV1SUS No.YD006“ about this section.Signal (A1)(A2)(A3) Ext. input Audio: No signal Video: Color (colour) bar signal NTSCMode (B) S-VHS EPTBC:OFFEquipment (C) OscilloscopeMeasuring point (D) TP2253 (A. PB FM) Main boardExternal trigger (E) TP111 (D.FF)Adjustment part (F) VR2251 (FMA REC LEVEL)Specified value (G1)(G2) 350 ± 50 mVp-p More than 200 mVp-pV. rateSpecifiedvalue (G1)Specifiedvalue (G2)