Zenith-XBV441-dvd-sm电路图 维修手册.pdf

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1、CONTENTS SECTION 1 . . . . SUMMARY SECTION 2 . . . . CABINET SW 30Hz PAL:SW 25Hz Head switching output point RF Envelope output point Play the standard test tape. 6. X- distance Adjustment Left X- distance Adjusting Hole Tilt Adjusting Screw (C) Fixing Screw Height Adjusting Screw (B) Right Grove of

2、 Base 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) Checking/Adjustment Procedure 1) Play the blank tape (empty tape) and check whether the gui

3、de roller crumbles or wrinkles the tape and adjust it if necessary. 2) Check that the RF envelope output waveform is flat, and adjust the height of the guide roller while playing the standard test tape. 3) Adjust the switching point. 4) Check the RF envelope output is the maximum when the tracking c

4、ontrol locates at the center. If not maxi- mum, set up to ensure that RF envelope output becomes the maximum by turning the (+) type driver ( 3 4) on the base A/C groove. 4- 18 DECK MECHANISM ADJUSTMENT 8- 2. Check of Tape Curl and Jam Status Fixtures and tools usedConnection positionVCR (VCP) statu

5、sAdjustment position Oscilloscope Standard test tape (only for SP) Post Height Adjusting Driver Driver (+) Type 5 CH-1: PB RF Envelope CH-2: NTSC : SW 30Hz PAL:SW 25Hz Head switching output point RF Envelope output point Play the blank tape. Play the standard test tape. Fine adjustment of guide roll

6、er Switching Point Tracking Preset X-distance 7. Adjustment after Drum Assembly (Video Heads) Purpose of adjustment : To adjust and stabilize the height change, X- distance change, etc depending on the guide roller after assembling the drum. RF ENVELOPE OUTPUT POINT V2V1V1 V1/V MAX = 0.7 V1/V MAX =

7、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 conversion of the play mode from the CUE or the REV mode. 2) Readjust the pa

8、ragraph 5 and 6 if it deviates from the standard. Fixtures and tools usedMeasuring standardConnection positionVCR (VCP) status Oscilloscope 6H 3KHz Color Bar Standard Test tape Stop Watch RF Locking Time: Within 5 seconds Audio Locking Time : Within 10 seconds CH-1: PB RF Envelope CH-2: Audio output

9、 RF Envelope output point Audio output jack Play the 6H 3KHz Color Bar Standard Test tape. 8. Check of Traveling Device after Deck Assembly 8- 1. Audio, RF Normalization Time (Locking Time) Check in Play after CUE or REV Checking Procedure 1) Check there is no abnormality of every traveling post sta

10、tus. 2) There must be no abnormal operation of the counter in occurrence 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 para- graph 4 and 5. Fixtures and tools usedFixtures and tools usedFixt

11、ures and tools used T-160 Tape T-120 Tape There must be no jam or curl at the first, middle and end position of tape. Travel the tape at the position of its first and end. PROTECTION, MAINTENANCE AND CHECK OF VIDEO FUNCTION 4- 19 (3) F/E Head (5) Drum Assembly (Video Head) (4) Base Assembly P2 (2) T

12、ension 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 abnormal even after removing cause, r

13、eplace 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.) Fig. C- 9- 1 TOP VIEW Fig. C- 9-

14、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 Belt No tape wound or tape w

15、ound 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 1. Checking Points prior to Repair Following abnormal phenomena may be repaired by removal of foreign materials a

16、nd 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 after checking the using period of the set together with the user. In this case, followings must be checked: PROTECTION, MAINTENANCE AND CHECK OF

17、 VIDEO FUNCTION 4- 20 2. Essential Check and Repair Recording density of the video is far 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 phe

18、nomena will appear as they are damaged. To maintain clear screen, regular check, replacement of old and damaged parts and oil supply, etc are essential. 3. Regular Check and Repair Check and repair schedule is not constant since they vary depending on method that the consumer uses video and environm

19、ent where the video is installed at. However, for the video used by common household, good screen will be maintained if regular check and repair per 1,000 hour is performed. The following chart shows relation- ship between using time and checking time: 4. Tools for Check and Repair (1) Grease: Floil

20、 G-3114 (KANTO) or equivalent grease (Green) (2) Grease: Kanto G-754, PL-433 (Yellow) (3) Alcohol (Isopropyl Alcohol) (4) Cleaning Patch (cloth) 5. Maintenance Process 5- 1) Removal of Foreign Material (1) Removal of foreign material from video head (Fig. C-9-4) Firstly try to use a cleaning tape. (

21、1) Use a cleaning patch if foreign materials are not removed with the cleaning tape 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

22、cally). (1) After completely drying the head, test the traveling status of the tape. (1) 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

23、the drive system with the cleaning patch soaked in alcohol (Isopropyl Alcohol) when removing 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) 2) Care must be exercised so that unrea

24、sonable force to change the pattern will be applied to the tape trans- port system during removal of foreign materials. About 1 year One hour Table 1 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 S

25、oak alcohol (Isopropyl Alcohol). Cleaning Patch (Cloth) Smoothly turn the drum (turning cylinder) touching the soft surface to the head tip surface. PROTECTION, MAINTENANCE AND CHECK OF VIDEO FUNCTION 4- 21 5- 2) Grease Applications (1) Grease Application Method Apply grease by using a cloth swab or

26、 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 alcohol (Isopropyl Alcohol). NOTE: POSITION OF GREASE APPLICATION (2) Regular Grease Application Apply grease to the designated application position every

27、 500 hour. 5 4 2 1 3 (1) Inner Side Surface and Top Surface of Loading Path (2) Stable Adhesion Part of Base P2, P3 (3) Arm Pinch Shaft (4) Gear Wheel Shaft (5) Reel S. T. Shaft (1) (2) (3) (4): KG-684G (Green) (5): PL-433 (Yellow) Cam Part (PL-433.Yellow) Gear Part (PL-433.Yellow) Boss Part Side Wa

28、ll (PL-433.Yellow) Gear Part Side Application (PL-433.Yellow) 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 (1) Inner Side Surface and Top Surface of Loading Path (2) St

29、able 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) (7) Guide Part on the Plate Slider Side Wall (Right) (1) (2) (3) (4) (5) (6) (7): KG- 684G (Green) Chassis (TOP) Chassis (Bottom) Cam Part (KG- 6

30、84G , GREEN) Cam Part (KG- 684G , GREEN) Gear Rack F/L Lever, Brake Driving 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 PROTECTION, MAINTENANCE AND CHECK OF VIDEO FUNCTION 4-

31、 22 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 MECHANISM TROUBLESHOOTING GUIDE 4- 23 No Auto Rewind operates. Is output of the end sensor “H”? “H”: 3.5V or less “L”: 0.7V 1V or less I

32、s voltage at both ends of the IR LED 0.8V-1.5? Replace the LED. Is the end sensor Vcc applied at 5V? Check the Syscon power supply. Replace the end sensor. Is the Syscon checked? NO YES YES YES YES NO NO 1.Deck Mechanism A. NO NO NO No F/R operates. Is the current mode an F/R mode? Check the assembl

33、y position of the Mode S/W. Is normal voltage applied at the Vcc1 and the Vcc2 of the Capstan motor? Is the Vctl terminal voltage of the Capstan Motor applied at more than 4V? Check the Servo, Power circuit. Replace the Capstan motor. Does the Capstan motor rotate? Does the T/up and the supply reel

34、Operate? Check the Syscon circuit. YES YES YES YES YES YES B. 4- 24 MECHANISM TROUBLESHOOTING GUIDE Auto Stop operates. (PLAY/CUE/REV) Does the T/UP or the supply reel pulse occur? Does the pinch roller attached to the Capstan shaft turn in opera- tion of the Play/Cue/Rev. Replace the reel sensor. I

35、s output of the DFG, DPG normal? Check the assembly mode. Check the spring pinch. Replace the drum motor. Check the Servo, Syscon. Check the Syscon, -com. No cassette loading is done. Insert the cassette. Check the holder assembly CST. Does output of the CST IN S/W change? (In insertion of the REC t

36、ape: “L”_“H”_ “L”) (In insertion of the REC preven- tion tape: “L”_ “H”_ “L”_ “H”) Is the CST IN S/W normal? Is operation of the lever assembly S/W normal? Check the Syscon circuit. Check the Syscon circuit. Replace the CST IN S/W. YES YES YES YES YES YES NO NO NO NO NONO NO YES C. D. 4- 25 MECHANIS

37、M TROUBLESHOOTING GUIDE No tape winding is done in play. Is the pinch roller attached to the Capstan shaft in operation of play? Check the assembly mode? Does the T/up reel operate? Hang the Capstan belt. Is the Capstan belt hung? Does the drum motor turn? Is the DPG, DFG normal? Are the T/up and th

38、e reel sensor normal? Check the Syscon circuit. Check the Syscon circuit. Check the Syscon circuit. Does the Capstan motor turn? Is the Vctl terminal voltage of the drum motor at more than 2.3V? Replace the drum motor. Is the Vcc voltage of the drum motor normal? Check the clutch and the idler assem

39、bly. YES YES YES YES YES YES YES YES NO NO NO NO NO Is the Vctl terminal voltage of the Capstan motor applied at more than 4V? Replace the Capstan motor. Is normal voltage applied to the capstan motor Vcc1, Vcc2? YES YES YES Check the Servo, power circuit. NO NO NO E. MECHANISM TROUBLESHOOTING GUIDE

40、 4- 26 No cassette insert is done. Does the lever assembly switch operate? Is the lever assembly switch spring normal? Does the CST IN switch operate normally? Add or replace the lever assembly switches spring. Is the Vcc of the main P.C.B assembly? YES YES Check the Syscon circuit. YES Check the po

41、wer circuit. NO Is voltage between the cassette switch terminal and the GND on the main P.C.B assembly? YES Is there short between the cassette switch terminal and the GND on the main P.C.B assembly? Replace the main P.C.B assem- bly or remove the short part. NO Check the mode switch position and th

42、e Syscon circuit. Replace the CST IN switch. YES NO YES NONO Replace the F/L switch. NO NO No cassette eject is done. Does the L/D motor turn in reverse? Check the L/D motor and the drive IC. Replace the lever assembly switch. Does the lever assembly switch operate? YES NO NO Does the arm assembly F

43、/G operate? YES NO Does the opener door operate? YES Replace the arm assembly F/L Replace the opener door. 2. Front Loading Mechanism A. B. MECHANISM TROUBLESHOOTING GUIDE 4- 27 No safe adherence of tape is done. Is cassette insert done? Does the opener lid operate? Check the assembly status of the

44、opener door. Replace the opener lid. Replace the arm assembly F/L. Check power supply of the L/D motor. Check the assembly status of the holder assembly cassette. Replace the gear rack F/L. Does the gear rack F/L operate? Does the opener door operate? Does the arm assembly F/L operate? Does the L/D

45、motor operate? Does the holder assembly cassette move same as the arm assembly F/L? Replace the front loading mechanism assembly. YES YES YES YES NO NO NO YES NO YES NO YES NO C. 4- 28 EXPLODED VIEWS 100 A21 A23 A24 032 109 A22 054A 054 115 116 110 112 113 114 103 105 102 106 107 1. Front Loading Me

46、chanism Section EXPLODED VIEWS 4- 29 008 011 031 079 017 032 024 406 031 021028 029 026 A03 027 022 003 004 006 007 014 015 009 409 013 016 012 OPTIONAL PART A01 405 2. Moving Mechanism Section (1) EXPLODED VIEWS 4- 30 052 517 061 056 518 052A 055 410 032 077 076 078 060 051 064 A11 A12 067 066 065

47、068 069 070 023 080 058 3. Moving Mechanism Section (2) DECK MECHANISM PARTS LOCATIONS Top View.5-1 Top View(without Tray Disc).5-1 Bottom View .5-1 DECK MECHANISM DISASSEMBLY 1. Holder Clamp.5-2 1-1. Clamp Assembly Disc.5-2 1-1-1. Plate Clamp .5-2 1-1-2. Magnet Clamp .5-2 1-1-3. Clamp Upper.5-2 2. Tray Disc.5-2 3. Base Assembly Sled.5-3 3-1. Gear Assembly Feed.5-3 3-2. Gear Assembly Middle.5-3 3-3. Gear Assembly Rack.5-3 4. Rubber Rear.5-3 5. Frame Assembly Up/Down.5-4 6. Belt Loading.5-4 7. Gear Pulley .5-4 8. Gear Loading.5-4 9. Guide Up/Down.