Jvc-HRXV-28-SEF-Service-Manual 电路图 维修手册.pdf

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1、SERVICE MANUAL COPYRIGHT 2005 Victor Company of Japan, Limited No.YD068 2005/5 DVD PLAYER SW 30Hz PAL:SW 25Hz Head switching output point RF Envelope output point Play the Alignment tape Left X-value Adjusting Hole Tilt Adjusting Screw (C) Fixing Screw Height Adjusting Screw (B) Right Grove of Base

2、A/C Purpose of adjustment : To maintain compatibility with other VCR (VCP). RF ENVELOPE OUTPUT POINT HEAD RF SWITCHING OUTPUT POINT OSCILLOSCOPE Connection Diagram CH-2CH-1 Azimuth Adjustment Screw(A) (No.YD068)1-27 4.3.8Adjustment after Drum Assembly (Video Heads) 4.3.9Check of Traveling Device aft

3、er Deck Assembly 4.3.9.1Audio, RF Normalization Time (Locking Time) Check in Play after CUE or REV 4.3.9.2Check of Tape Curl and Jam Status Checking/Adjustment Procedure 1) Play the blank tape and check whether the guide roller crumbles or wrinkles the tape and adjust it if necessary. 2) Check that

4、the RF envelope output waveform is flat, and adjust the height of the guide roller while playing the alignment tape. 3) Adjust the switching point. 4) Check the RF envelope output is the maximum when the tracking control locates at the center. If not maximum, set up to ensure that RF envelope output

5、 becomes the maximum by turning the (+) type driver on the base A/C groove. Fixtures and tools usedConnection positionVCR (VCP) statusAdjustment position Oscilloscope Alignment tape (only for SP) Post Height Adjusting Driver Driver (+) Type 5mm CH-1: PB RF Envelope CH-2: NTSC : SW 30Hz PAL:SW 25Hz H

6、ead switching output point RF Envelope output point Play the blank tape. Play the Alignment tape. Fine adjustment of guide roller Switching Point Tracking Preset X-value Purpose of adjustment : To adjust and stabilize the height change, X-distance change, etc depending on the guide roller after asse

7、mbling the drum. RF ENVELOPE OUTPUT POINT V2V1V1 V1/V MAX = 0.7 V1/V MAX = 0.8 RF ENVELOPE OUTPUT HEAD RF SWITCHING OUTPUT POINT OSCILLOSCOPE Connection Diagram Waveform CH-2CH-1 Checking Procedure 1) Check that locking time of the RF and Audio waveform is fallen within the measuring standard in con

8、version of the play mode from the CUE or the REV mode. 2) Readjust the paragraph 4.3.6 and 4.3.7 if it deviates from the standard. Fixtures and tools usedMeasuring standardConnection positionVCR (VCP) status Oscilloscope Alignment tape (Colour bar) Stop Watch RF Locking Time: Within 5 seconds Audio

9、Locking Time : Within 10 seconds CH-1: PB RF Envelope CH-2: Audio output RF Envelope output point Audio output jack Play the Alignment tape (Colour bar) Checking Procedure 1) Check there is no abnormality of every traveling post status. 2) There must be no abnormal operation of the counter in occurr

10、ence of folding of the bottom tape. There must be not abnormality of audio signal in damage of the top tape. 3) If there is abnormality, readjust the adjustment paragraph 4.3.5 and 4.3.6. Fixtures and tools usedFixtures and tools usedFixtures and tools used E-240 Tape E-160 Tape There must be no jam

11、 or curl at the first, middle and end position of tape. Travel the tape at the position of its first and end. 1-28 (No.YD068) 4.4PROTECTION, MAINTENANCE AND CHECK OF VIDEO FUNCTION (VCR) 4.4.1Checking Points prior to Repair Following abnormal phenomena may be repaired by removal of foreign materials

12、 and oil supply. Check oiling is required at the checking set or cleaning status is complete. Determine that necessity of checking and repair the set exists af- ter checking the using period of the set together with the user. In this case, followings must be checked: (3) F/E Head (5) Drum Assembly (

13、Video Head) (4) Base Assembly P2 (2) Tension Post (1) Supply Reel (6) Base Assembly P3 Phenomena Replace- ment Checking Points and Cause Color beatPollution of Full-Erase Heado S/N, Color FadedPollution of Video Heado Horizontal, Vertical Jitteo CAUTIONS If operation of the position with (O) mark is

14、 abnormal even after removing cause, replace it with substitute product since it shows damage or wearing. (7) A/C Head (8) P4 Post (10) Pinch Roller (11) Take-up Guide Post (9) Capstan Shaft (12) Take-up Reel * No. (1) (12) shows sequence that the tape moves from the supply reel to the take-up reel.

15、) Fig. C-9-1 TOP VIEW Fig. C-9-2 BOTTOM VIEW F/E Head Video Head A/C Head Pinch Roller Belt Capston Clutch Assembly A37 Fig. C-9-3 Tape Transport System Pollution of Video Head or Tape Transport System Poor Sound, Low Soundo Pollution of Audio/Control Head o Pollution of Pinch Roller or Belt Capstan

16、 Belt No tape wound or tape wound loosely. FF or REW impossible, or slow turning Deterioration of Clutch Assembly D37 Torque Pollution of Drum and Traveling Device Tape loosely wound in REV or Unloading o Fig. C-9-3 (No.YD068)1-29 4.4.2Essential Check and Repair Recording density of the video is far

17、 higher than the audio. Therefore video parts are very precise so as to allow only error of 1/1000mm or so in order to maintain compatibility with other videos. If one of these parts is polluted or old, same phenomena will appear as they are damaged. To maintain clear screen, regular check, replacem

18、ent of old and damaged parts and oil supply, etc are essential. 4.4.3Regular Check and Repair Check and repair schedule is not constant since they vary de- pending on method that the consumer uses video and environ- ment where the video is installed at. However, for the video used by common househol

19、d, good screen will be maintained if regular check and repair per 1,000 hour is performed. The following chart shows relationship between us- ing time and checking time: 4.4.4Tools for Check and Repair (1) Grease: Floil G-3114 (KANTO) or equivalent grease (Green) (2) Grease: Kanto G-754, PL-433 (Yel

20、low) (3) Alcohol (Isopropyl Alcohol) (4) Cleaning Patch (cloth) 4.4.5Maintenance Process 4.4.5.1Removal of Foreign Material (1) Removal of foreign material from video head (Fig. C-9-4) Firstly try to use a cleaning tape. Use a cleaning patch if foreign materials are not removed with the cleaning tap

21、e due to severe dirty of the head. Soak the cleaning patch in alcohol and put it to the head tip. Smoothly turn the drum (turning cylinder) to the right or left (In this case, the cleaning patch must not be moved verti- cally). After completely drying the head, test the traveling status of the tape.

22、 If alcohol (Isopropyl Alcohol) remains at the video head, the tape may be damaged when this solution touches with the head surface. Never use a cloth bar (commercial sale) (2) Wipe the tape transport system and the drive system with the cleaning patch soaked in alcohol (Isopropyl Alcohol) when remo

23、ving foreign materials from them. 1) The part touched with the traveling tape is called as tape transport system. The drive system consists of parts to travel the tape. 2) Care must be exercised so that unreasonable force to change the pattern will be applied to the tape transport system during remo

24、val of foreign materials. About 1 year One hour Two hours Three hours Time Requiring Checking Average hours used per day About 18 months About 3 years Fig. C-9-4 Drum (Turning Cylinder) Head Tip Soak alcohol (Isopropyl Alcohol). Cleaning Patch (Cloth) Smoothly turn the drum (turning cylinder) touchi

25、ng the soft surface to the head tip surface. 1-30 (No.YD068) 4.4.5.2Grease Applications (1) Grease Application Method Apply grease by using a cloth swab or brush. Care must be exercised so that excess quantity should not be used. If the excessive quantity is applied, wipe it with the gauze soaked in

26、 alcohol (Isopropyl Alcohol). (2) Regular Grease Application Apply grease to the designated application position every 500 hour. NOTE: POSITION OF GREASE APPLICATION 5 4 2 1 3 Cam Part (PL-433.Yellow) Gear Part (PL-433.Yellow) Boss Part Side Wall (PL-433.Yellow) Gear Part Side Application (PL-433.Ye

27、llow) Cam Part Side Application (KG-684G.Green) Gear SectorGear Cam Base LoadingGear Drive Inner Surface of Guide Rail (KG-684G.Green) Chassis (L)Chassis (R) Gear Part 1 2 3 4 6 5 7 Chassis (TOP) Chassis (Bottom) Cam Part (KG-684G , GREEN) Cam Part (KG-684G , GREEN) Gear Rack F/L Lever, Brake Drivin

28、g Cam Part Side Wall Guide Part Lever F/R Driving Part Side Wall Guide Part Lever, Spring Driving Part Lever Tension Driving Cam Part Gear Sector Driving Part Plate Slider (1) Inner Side Surface and Top Surface of Loading Path (2) Stable Adhesion Part of Base P2, P3 (3) Arm Pinch Shaft (4) Gear Whee

29、l Shaft (5) Reel S. T. Shaft (1) (2) (3) (4): KG-684G (Green) (5): PL-433 (Yellow) (1) Inner Side Surface and Top Surface of Loading Path (2) Stable Adhesion Part of Base P2, P3 Coil (3) Gear Cam Shaft (4) Gear Drive Shaft (5) Clutch Shaft Groove (6) Guide Part on the Plate Slider Side Wall (Left) (

30、7) Guide Part on the Plate Slider Side Wall (Right) (1) (2) (3) (4) (5) (6) (7): KG- 684G (Green) (No.YD068)1-31 Lever, F/R, Base, TensionGEAR AY, P2 & P3 LEVER, F/R Clutch Contact Part (PL-433, Yellow) Tension Arm Party Hinge Part (PL-433, Yellow) BASE, TENSION PL-433 1-32 (No.YD068) 4.5ELECTRICAL

31、ADJUSTMENT PROCEDURES (VCR) 4.5.1Servo Adjustment V.Out H/SW (TP) OSCILLOSCOPE CH1 CH2 V.outH/SW R/C KEY (TP) H/SW Composite VIDEO 6.5H(412 s) 1) PG Adjustment Test Equipment a) OSCILLOSCOPE Adjustment And Specification b) Alignment tape (SP, stairstep) MODEMEASUREMENT POINTADJUSTMENT POINTSPECIFICA

32、TION PLAY V.Out H/SW(TP) R/C TRK JIG KEY6.5 0.5H Adjustment Procedure a) Insert the Alignment Tape and play. Note - Adjust the distance of X, pressing the Tracking(+) or Tracking(-) when the ATR is blink after the Alignment Tape is inserted. b) Connect the CH1 of the oscilloscope to the H/SW(TP) and

33、 CH2 to the Video Out for the VCR. c) Trigger the mixed Combo Video Signal of CH2 to the CH1 H/SW(TP) and then check the distance (time difference), which is from the selected A(B) Head point of the H/SW(TP) signal to the starting point of the vertical synchronized signal, to 6.5H 0.5H (412 s, 1H=63

34、 s). PG Adjustment Method a-1) Playback the Alignment tape b-2) Press the OK(ENTER) key on the Remote controller and the REC key on the Front Panel the same time, then it goes in to Tracking initial mode. c-3) Repeat the above step(No.b-2), then it finishes the PG adjusting automatically. d-4) Stop

35、the playback, then it goes out to PG adjusting mode after mony the PG data. CONNECTION WAVEFORM (No.YD068)1-33 4.6DECK MECHANISM PARTS LOCATION (DVD) Starting No. 1 1, 2 1, 2, 3 1, 2, 3, 4 1 1, 6 1, 2, 6 1, 2, 6, 8 1, 2, 6, 8, 9 1, 2, 7 1, 2, 7 1, 2 1, 2 ,13 1, 2, 13, 14 1, 2, 7, 12, 13, 14 1, 2, 13

36、 1, 2, 7, 12, 13, 14, 15, 16, 17 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Main Base Clamp Assembly Disc Plate Clamp Magnet Clamp Clamp Upper Tray Disc Base Assembly Sled Gear Feed Gear Middle Gear Rack Rubber Rear Frame Assembly Up/Down Belt Loading Gear Pulley Gear Loading Guide Up/Down PWB Ass

37、embly Loading Base Main 4 Screws, 1 Connector 1 Locking Tabs 1 Screw 1 Screw 1 Locking Tab 1 Locking Tab 1 Locking Tab 1 Hook 2Screw 2 Locking Tabs 5-1 5-1 5-1 5-1 5-1 5-2 5-3 5-3 5-3 5-3 5-3 5-4 5-4 5-4 5-4 5-4 5-4 5-4 Bottom Bottom Procedure PartsFixing Type Fig- ure Disass embly Note Top View (Wi

38、thout Tray) Bottom View Top View (With Tray) When reassembling, perform the procedure in reverse order. The Bottom on Disassembly column of above Table indicates the part should be disassembled at the Bottom side. 1-34 (No.YD068) MAIN BASE TRAY DISC BASE MAIN LEVER BASE MAIN BOTTOM SIDE VIEW PLATE C

39、LAMP MAGNET CLAMP CLAMP UPPER HOLDER BASE MAIN Fig. 5-2Fig. 5-1 (Fig. A) DISC CLAMP ASSEMBLY 1.Main Base (Fig. 5-1) 1-1. Clamp Assembly Disc 1) Place the Clamp Assembly Disc as Fig. (A) 2) Lift up the Clamp Assembly Disc in direction of arrow(A). 3) Separate the Clamp Assembly Disc from the Holder C

40、lamp. 2. Tray Disc (Fig. 5-2) 1) Insert and push a Driver in the emergency eject hole(A) at the right side, or put the Driver on the Lever(B) of the Gear Emergency and pull the Lever(B) in direction of arrow so that the Tray Disc is ejected about 1520mm. 2) Pull the Tray Disc until it is separated f

41、rom the Base Main completely. 1-1-1. Plate Clamp 1-1-2. Magnet Clamp 1-1-3.Clamp Upper 1) Turn the Plate Clamp to counterclockwise direction and then lift up the Plate Clamp. (No.YD068)1-35 3.Base Assembly Sled (Fig. 5-3) 1) Release 4 Screw(S2). 2) Disconnect the FFC Connector(C1) 3-1. Gear Feed 3-2

42、. Gear Middle 3-3. Gear Rack 1) Release the Scerw(S3) 4. Rubber Rear (Fig. 5-3) BASE PU RUBBER DAMPER RUBBER DAMPER SCREW INSERTION TORGUE CONTROL (800gf DOWN) RUBBER DAMPER Distinguish upper and lower sides (Assemble with care) Distinguish upper and lower sides (Assemble with care) MIDDLE GEAR RUBB

43、ER DAMPER GEAR RACK PINION GEAR GEAR RACK GENERAL PICK UP ASSEMBLY SPINDLE MOTOR ASSEMBLY (S2) (S2) (S3) Fig. 5-3 1-36 (No.YD068) 5. Frame Assembly Up/Down (Fig. 5-4) Put the Base Main face down(Bottom Side) 1) Release the screw(S4) 2) Unlock the Locking Tab(L3) in direction of arrow and then lift u

44、p the Frame Assembly Up/Down to separate it from the Base Main. When reassembling move the Guide Up/Down in direction of arrow(C) until it is positioned as Fig.(C). When reassembling insert (A) portion of the Frame Asse- mbly Up/Down in the (B) portion of the Guide Up/Down as Fig.(B) 6. Belt Loading

45、(Fig. 5-4) Put the Base Main on original position(Top Side) 7. Gear pulley (Fig. 5-4) 1) Unlock the Locking Tab(L4) in direction of arrow(B) and then separate the Gear Pulley from the Base Main. 8. Gear Loading (Fig. 5-4) 9. Guide Up/Down (Fig. 5-4) 1) Move the Guide Up/Down in direction of arrow(A)

46、 as Fig.(A) 2) Push the Locking Tab(L5) down and then lift up the Guide Up/Down to separate it from the Base Main. When reassembling place the Guide Up/Down as Fig.(C) and move it in direction arrow(B) until it is locked by the Locking Tab(L5). And confirm the Guide Up/Down as Fig.(A) 10. PWB Assemb

47、ly Loading (Fig. 5-4) Put the Base Main face down(Bottom Side) 1) Release 1 Screws(S5) 2) Unlock the Loading Motor (C2) from the Hook (H1) on the Base Main. 3) Unlock 2 Locking Tabs(L6) and separate the PWB Assembly Loading from the Base Main. 11. Base Main(Fig. 5-4) Note Note Note Note Note GEAR LO

48、ADING GEAR PULLEY BELT LOADING PWB ASSEMBLY LOADING BASE MAIN GUIDE UP/DOWN GUIDE UP/DOWN GUIDE UP/DOWN UP/DOWN FRAME ASSEMBLY GUIDE UP/DOWN BASE MAIN (L3) (L6) (L4) (L6) (H1) (C2) (S5) (S4) (A) (A) (B) (B) (C) (L5) FIG. (A) FIG. (B) FIG. (C) (A) (B) Fig. 5-4 SCREW INSERTION TORGUE CONTROL (800gf DO

49、WN) (No.YD068)1-37 SECTION 5 TROUBLESHOOTING 5.1ELECTRICAL TROUBLESHOOTING GUIDE (VCR PART) 5.1.1Power(SMPS) CIRCUIT (1) No 5.3VA No 5.3VA Is the FR101 Normal? Is the BD101 Normal? Is the R101 Normal? Are the D125 normal? Is Vcc (9V - 18V) sup- plied to IC101 Pin2? Replace the FR101 (Use the same ICW) Replace the BD101 Is the D102 normal? Check or Replace the D102 Replace the R101 Replace the R125 Is the D123 normal? Replace the D123 Is the D124 Normal? Replace the D124 Is the D121 Normal? Replace the D121 Is there about 2.5V at the IC103 Pin1? Power