Jvc-HRXVC-27-UM-Service-Manual 电路图 维修手册.pdf

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1、SERVICE MANUAL COPYRIGHT 2004 Victor Company of Japan, Limited No.YD023 2004/8 DVD PLAYER preset to Channel 3 when shipped) 75, unbalanced TIMER Clock referenceQuartz Program capacity1-year programmable timer/8 programs Memory backup timeApprox. 3 minutesApprox. 5 seconds ACCESSORIES Provided access

2、oriesRF cable, Infrared remote control unit, “AA” battery 2 RF cable, Infrared remote control unit, “AA” battery 2, Conversion Plug RadioFans.CN 收音机爱 好者资料库 (No.YD023)1-3 SECTION 1 PRECAUTION Please refer to HR-XVC27US No.YD008 about this section. SECTION 2 SPECIFIC SERVICE INSTRUCTIONS Please refer

3、to HR-XVC27US No.YD008 about this section except a written item. 2.1DIFFERENCE LIST The following table indicates main different points between models HR-XVC27US, HR-XVC27UA, HR-XVC27UM and HR- XVC29UJ. NOTE: Mark is same as left. SECTION 3 DISASSEMBLY Please refer to HR-XVC27US No.YD008 about this

4、section. HR-XVC27USHR-XVC27UAHR-XVC27UMHR-XVC29UJ POWER VOLTAGEAC120V, 60HzAC110-220V, 50/60Hz POWER PLUGUL, CSAIRAMSASO SHUTTLE SEARCH (LATCH) - PAL NOT USEDSP 7, LP 7NOT USED VIDEO SYSTEM : VHS NTSC(SP/EP) PAL-N(SP,LP) / NTSC(SP,EP) NTSC(SP/EP) RECORDING & PLAYBACK SPEED SP/EP NTSC:REC:SP/EP, PLAY

5、:SP/LP/EP PAL-N:REC:SP/LP, PLAY:SP/LP SP/EP REMOTE PAUSE TERMINALNOT USEDUSED D.S.T. MODEUSED(AUTO/ON/OFF)USED(MANUAL)NOT USEDUSED(AUTO/ON/OFF) AUTO CLOCK / JUST CLOCKUSEDNOT USEDUSED VCR OSD LANGUAGE INITIAL ENGLISH, SPANISH, FRENCH SPANISH, ENGLISH ENGLISH, SPANISH, FRENCH REGION CODEREGION CODE 1

6、REGION CODE 4REGION CODE 1 RadioFans.CN 收音机爱 好者资料库 1-4 (No.YD023) SECTION 4 ADJUSTMENT Please refer to HR-XVC27US No.YD008 about this section except a written item. 4.1Before adjustment 4.1.1Precaution The adjustments of this unit include the mechanism com- patibility and electrical adjustments. Dur

7、ing the perfor- mance of this work, be sure to observe the precautions for each type of adjustment. If there is a reference to a signal input method in the signal column of the adjustment chart, Ext. S-input means the Y/C separated video signal and Ext. input means the composite video signal input.

8、Unless otherwise specified, all measuring points and adjustment parts are located on the Main board. 4.1.2Required test equipments Color (colour) television or monitor Oscilloscope: wide-band, dual-trace, triggered delayed sweep Signal generator: RF / IF sweep / marker Signal generator: stairstep, c

9、olor (colour) bar PAL Recording tape Digit-key remote controller(provided) 4.1.3Required adjustment tools ? : Used - : Not used 4.1.4Color (colour) bar signal,Color (colour) bar pattern 4.1.5Switch settings When adjusting this unit, set the VCR mode and switches as de- scribed below. When using the

10、Jig RCU, it is required to set the VCR to the Jig RCU mode (the mode in which codes from the Jig RCU can be received). (See section 2 SPECIFIC SERVICE INSTRUC- TIONS.) Fig.4-1a Jig RCU PTU94023B Set the switches as shown below unless otherwise specified on the relevant adjustment chart. The switches

11、 that are not list- ed below can be set as desired. If the VCR is not equipped with the functions detailed below, setup is not required. Mechanism compatibility adjustment Electrical adjustment Roller driver ?- Jig RCU -? Back tension cassette gauge?- Alignment tape (MHP, MHPE)?- Alignment tape (MHP

12、-L,MHPE-L) ? Roller driver PTU94002 Back tension cassette gauge PUJ48076-2 Jig RCU PTU94023B Alignment tape (SP, stairstep, PAL) MHPE Alignment tape (LP, stairstep, PAL) MHPE-L Alignment tape (SP, stairstep, NTSC) MHP Alignment tape (EP, stairstep, NTSC) MHP-L DVD test disc VT-501 CD-DA test disc CT

13、S-1000 AUTO PICTURE/VIDEO CALIBRATION/ B.E.S.T./D.S.P.C. OFF PICTURE CONTROL/SMART PICTURENORMAL/NATURAL VIDEO STABILIZEROFF TBCON Digital 3RON VIDEO NAVIGATION/TAPE MANAGEROFF BLUE BACK OFF White(75%) 100 IRE 40 IRE Horizontal sync QI 1V White(100%) Yellow Cyan Green Magenta Red Blue Burst 40 IRE W

14、hite Yellow Cyan Green Magenta Red Blue QIBlack White 100% (75%) Color(colour) bar signal NTSCColor(colour) bar pattern NTSC (75%) White(75%) 0.7 V 0.3 V Horizontal sync VU 1V White(100%) Yellow Cyan Green Magenta Red Blue Burst 0.3 V V(R-Y) U(B-Y) White Yellow Cyan Green Magenta Red Blue UBlack Whi

15、te 100% V Colour bar signal PAL Colour bar pattern PAL INITIAL MODE DATA CODE CUSTOM CODE 43: ACODE Data transmitting method Depress the ( 3 ) button after the data code is set. Jig RCU (No.YD023)1-5 4.1.6Manual tracking mode (Auto tracking ON/OFF) setting (1) In order to set to the manual tracking

16、mode during tape playback, press the SP/EP(LP)button on the remote con- trol unit. Each press of the button switches the auto tracking ON or OFF. When the manual tracking mode is set, the tracking is placed at the center position. (2) Press channel +/- to adjust the tracking manually. 4.2 Mechanism

17、compatibility adjustment VHS SECTION Note: Although compatibility adjustment is very important, it is not necessary to perform this as part of the normal servicing work. It will be required when you have re- placed the A/C head, drum assembly or any part of the tape transport system. To prevent dama

18、ging the alignment tape in the compat- ibility adjustment, prepare a cassette tape (for self-re- cording/playback), perform a test on it by transporting it and making sure that the tape is not bent by the tape transport mechanisms such as in the guide rollers.(See Fig.4-2b.) 4.2.1Tension pole positi

19、on Note: This adjustment must be performed every time the ten- sion band is replaced. (1) Play back the back tension cassette gauge (A). (2) Check that the indicated value on the left side gauge is within the specified value (G). (3) If the indicated value is not within the specified value (G), perf

20、orm the adjustment in a following procedure.(See Fig.4-2a.) a) Remove the top frame, cassette holder and side frames (L/R) all together. (Refer to the SERVICE MANUAL No.86700 MECHANISM ASSEMBLY.) b) Rotate the loading motor gear to move the control plate so that the triangular stamping to the left o

21、f the Pstamping is aligned with the stamping (a) on the main deck. This positioning is mode (B1). c) Adjust by turning the adjustment pin so that the tip of the tension arm is aligned with the stamping (b) on the main deck. d) Rotate the reel disk (S) by about one turn clockwise and make sure that t

22、he round hole of the adjustment pin is located in the OK range. If it is outside this range, restart the adjustment from the beginning. After completion of the adjustment, rotate the loading gear motor to return it to the mode (B2) position. Fig.4-2a 4.2.2FM waveform linearity (1) Play back the alig

23、nment tape (A1). (2) Apply the external trigger signal to D.FF (E), to observe the V.PB FM waveform at the measuring point (D). (3) Set the VCR to the manual tracking mode. (4) Make sure that there is no significant level drop of the V.PB FM waveform caused by the tracking operation, with its genera

24、lly parallel and linear variation ensured. Perform the following adjustments when required. (See Fig. 4-2c.) (5) Reduce the V.PB FM waveform by the tracking operation. If a drop in level is found on the left side, turn the guide roll- er of the pole base assembly (supply side) with the roller driver

25、 to make the V.PB FM waveform linear. If a drop in level is on the right side, likewise turn the guide roller of the pole base assembly (take-up side) with the roller driver to make it linear. (See Fig. 4-2c.) (6) Make sure that the V.PB FM waveform varies in parallel and linearly with the tracking

26、operation again. When re- quired, perform fine-adjustment of the guide roller of the pole base assembly (supply or take-up side). (7) Unload the cassette tape once, play back the alignment tape (A1) again and confirm the V.PB FM waveform. (8) After adjustment, confirm that the tape wrinkling does no

27、t occur at the roller upper or lower limits. (See Fig. 4-2b.) Perform adjustment step (9) only for the models equipped with SP mode and EP (or LP) mode. Perform adjustment step (9) only for the models equipped with SP mode and EP (or LP) mode. (9) Repeat steps (1) to (8) by using the alignment tape

28、(A2). Signal(A) Back tension cassette gauge PUJ48076-2 Mode(B1) (B2) PB Eject end Adjustment part (F) Adjust pin Mechansim assembly Specified value(G)25 - 51 gfcm (2.45 - 5 x 10-3 Nm) Signal(A1) (A2) Alignment tape(SP, stairstep, PAL) MHPE Alignment tape(LP, stairstep, PAL) MHPE-L (UA Model) (A1) (A

29、2) Alignment tape(SP, stairstep, PAL) MHP Alignment tape(EP, stairstep, PAL) MHP-L (UJ, UM Model) Mode(B) PB Equipment(C) Oscilloscope Measuring point (D) TP106 (PB. FM) External trigger(E) TP111 (D. FF) Adjustment part (F) Guide roller Mechanism assembly Specified value(G) Flat V. PB FM waveform Ad

30、justment tool (H) Roller driver PTU94002 OK NG ADJUST PIN TENSION ARM Stamping(b) Stamping(a) CONTROL PLATE 1-6 (No.YD023) Fig.4-2b Fig.4-2c 4.2.3Height and tilt of the A/C head Note: Set a temporary level of the height of the A/C head in ad- vance to make the adjustment easier after the A/C head ha

31、s been replaced. (Refer to the SERVICE MANUAL No.86700 MECHANISM ASSEMBLY.) (1) Play back the alignment tape (A). (2) Apply the external trigger signal to D.FF (E), to observe the AUDIO OUT waveform and Control pulse waveform at the measuring points (D1) and (D2) in the ALT mode. (3) Set the VCR to

32、the manual tracking mode. (4) Adjust the AUDIO OUT waveform and Control pulse wave- form by turning the screws (1), (2) and (3) little by little until both waveforms reach maximum. The screw (1) and (3) are for adjustment of tilt and the screw (2) for azi- muth. Fig.4-2d 4.2.4A/C head phase (X-value

33、) (1) Play back the alignment tape (A1). (2) Apply the external trigger signal to D.FF (E), to observe the V.PB FM waveform at the measuring point (D). (3) Set the VCR to the manual tracking mode. (4) Loosen the screws (4) and (5), then set the Roller driver to the innermost projected part of the A/

34、C head. (See Fig. 4- 2e.) (5) Rotate the roller driver so that the A/C head comes closest to the capstan. From there, move the A/C head back grad- ually toward the drum until the point where the FM wave- form is maximized for the second time, and then tighten the screws (4) and (5) temporarily. (6)

35、Play an alignment tape (A2) and set to the manual-tracking mode. (7) Fine-adjust A/C head base position to maximize the FM waveform, and then tighten the screws (4) and (5) firmly. (8) Play alignment tapes (A1) and (A2) and confirm that the FM waveforms are maximized when the tracking is at the cen-

36、 ter position. Fig.4-2e Signal(A) Alignment tape(SP, stairstep, PAL) MHPE (UA Model) (A) Alignment tape(SP, stairstep, PAL) MHP (UJ, UM Model) Mode(B) PB Equipment(C) Oscilloscope Measuring point (D1) (D2) TP106 (PB. FM) TP4001 (CTL. P) External trigger(E) TP111 (D. FF) Adjustment part (F) A/C head

37、Mechanism assembly Specified value(G) Maximum waveform (a) GUIDE ROLLER (b) GUIDE POLE ImproperProper Improper waveform variation A B CD UpDown Guide roller (supply side) Roller driver Proper waveform variation Signal(A1) (A2) Alignment tape(SP, stairstep, PAL) MHPE Alignment tape(LP, stairstep, PAL

38、) MHPE-L (UA Model) (A1) (A2) Alignment tape(SP, stairstep, PAL) MHP Alignment tape(EP, stairstep, PAL) MHP-L (UJ, UM Model) Mode(B) PB Equipment(C) Oscilloscope Measuring point (D) TP106 (PB. FM) External trigger(E) TP111 (D. FF) Adjustment part (F) A/C head base Mechanism assembly Specified value(

39、G) Flat V. PB FM waveform Adjustment tool (H) Roller driver PTU94002 Head base A/C head AUDIO OUT CTL. P (1) (2) (3) Head base Roller driver To the capstan To the drum Toward the capstan Toward the drum Screw (5) Screw (4) A/C head (No.YD023)1-7 Fig.4-2f 4.3 Electrical adjustment VHS SECTION Note: T

40、he following adjustment procedures are not only neces- sary after replacement of consumable mechanical parts or board assemblies, but are also provided as references to be referred to when servicing the electrical circuitry. In case of trouble with the electrical circuitry, always be- gin a service

41、by identifying the defective points by using the measuring instruments as described in the following electrical adjustment procedures. After this, proceed to the repair, replacement and/or adjustment. If the required measuring instruments are not available in the field, do not change the adjustment

42、parts (variable resistor, etc.) carelessly. 4.3.1Servo circuit 4.3.1.1Switching point (1) Play back the signal (A1) of the alignment tape (A2). (2) Apply the external trigger signal to D.FF (E) to observe the VIDEO OUT waveform and V.PB FM waveform at the measuring points (D1) and (D2). (3) Set the

43、VCR to the manual tracking mode. (4) Adjust tracking so that the V.PB FM waveform becomes maximum. (5) Set the VCR to the Auto adjust mode by transmitting the code (F) from the Jig RCU. When the VCR enters the stop mode, the adjustment is completed. (6) If the VCR enters the eject mode, repeat steps

44、 (1) to (5) again. (7) Play back the alignment tape (A2) again, confirm that the switching point is the specified value (G). (1) Play back the signal (A1) of the alignment tape (A3). (2) Perform the above steps (2) to (6). Fig.4-3a Switching point 4.3.1.2Slow tracking preset (1) Record the signal (A

45、2) in the mode (B1), and play back the recorded signal. (2) Set the VCR to the manual tracking mode. (3) Set the VCR to the FWD slow (+1/6x) mode. (4) Transmit the code (F) from the Jig RCU to adjust so that the noise bar becomes the specified value (G) on the TV mon- itor in the slow mode. (5) Set

46、the VCR to the Stop mode. (6) Confirm that the noise bar is (G) on the TV monitor in the slow mode. (1) Record the signal (A3) in the mode (B2), and play back the recorded signal. (2) Repeat steps (2) to (6) . Note: For FWD slow (+1/6x) playback, transmit the code 43-08 from the Jig RCU to enter the

47、 slow playback mode, and transmit the code “43-D0” for REV slow (+1/6x) mode. 4.3.2Syscon circuit UA, UM MODELS Notes: When perform this adjustment, remove the Mechanism assembly. 4.3.2.1Timer clock (1) Connect the frequency counter to the measuring point (D1). (2) Connect the short wire between the

48、 short point (D2) and Vcc (5V). (3) Short the leads of capacitor (D3) once in order to reset the microprocessor of the Syscon. (4) Disconnect the short wire between the short point (D2) and Vcc then connect it again. (5) Adjust the Adjustment part (F) so that the output frequency becomes the specifi

49、ed value (G). Signal(A1) (A2) (A3) Stairstep signal Alignment tape(EP,stairstep,NTSC) MHP-L Alignment tape(LP,stairstep,PAL) MHPE-L Mode(B) PB Equipment(C) Oscilloscope Measuring point (D) VIDEO OUT terminal (75 ohm terminated) TP106 (PB. FM) External trigger(E) TP111 (D.FF) Adjustment part (F) Jig RCU: Code “43-5A” Specified value(G) 6.5 0.5H Adjustment tool (H) Jig RCU PTU94023B Alignment tape SP, stairstep played with the SP head Alignment tape EP(LP), stairstep played with the EP(LP) head Drum sideControl head posit