Teac-MV-8080G-Service-Manual电路原理图.pdf

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1、Service Manual Video Cassette Recorder NO.289C3090 MV-8080G MV-8080G_1 Cover97.12.10, 20:35Page 1Adobe PageMaker 6.0J/PPC RadioFans.CN 收音机爱 好者资料库 Quick Reference of Specific Parts List (Latest upgrade list Dec. 97) The parts No. of Deck Mechanisms, Face Plate Assy and Video Circuit Boards for MV-808

2、0G. CABINET sound is produced by contact between the tip of rotating heads and the edge of the tape. 2. If the tape slips downward; the tape curls or wrinkles (or makes noise) at its connection with the lead face of the drum lead. 3. During loading, play, and unloading of the cassette tape, observe

3、the tape at the supply guide roller, and take-up guide roller. 4. Make sure that there are no curls or wrinkles as shown in the figure below. Guide Roller 5. Observe the tape as it wraps around the drum during PLAY and separates from the drum during STOP. 6. As shown in the figure below, make sure t

4、hat there is no damage to C and D and that there is no contact noise between the head tips and tape edge. Drum Lead Check-2 7. If a defect is detected during check, perform the follwoing procedure for adjusting Guide Roller height. C D ?o? ?K?C?h? ?e?v ?h?A?Z?u? ?“? ?K?C?h? ?h?h Tape Upper Drum Assy

5、 Drum Lead Supply Guide Roller Take-up Guide Roller ?K?C?h? ?l?W ?h?C?o? Turn with a standard screwdriver Guide Roller Tight Screw MV-8080G_5(616)97.12.11, 9:36Page 10Adobe PageMaker 6.0J/PPC 11 4-3. TAPE TRANSPORT CHECK AT THE TAKE-UP GUIDE In general, no adjustment will be necessary for the take-

6、up guide. However, adjustments or checks will be necessary when replacing the Audio/CTL Head or parts affecting the tape transport system after a long period of operation. 1. Using an ordinary cassette tape, set to PLAY mode. 2. Turn Audio/CTL Head screw C as shown in the figure below and adjust for

7、 smooth transport at the Take-up Guide. 5. INTERCHANGEABILITY ADJUSTMENT Before using the test tape, make sure that the tape transport is normal using an ordinary cassette tape. Also, make sure that the switching point (Refer to P.5) is adjusted. If they are not, do the following checks after adjust

8、ing. 5-1. PRELIMINARY CHECKS 1.FM Envelope Waveform Check 1. Connect the CH-1 oscilloscope to TP of PB ENV and CH-2 to TP of CTL. At this time, trigger the oscilloscope externally with the signal (RF Switching Pulse) from TP of RFS. 2. Play the test tape (Stairstep). 3. Use the Channel /5 buttons to

9、 tune the tracking to center position. Adjust point 4 (X value adjustment point: test point reference P.6) so that the FM envelope output at TP of PB ENV reaches a maximum. ?“?K?C?h ?e?v ?e?v ADBEC Tape Tape Take-up Guide 4. Using the Channel /5 buttons. Perform the following 3 steps (5-7) by moving

10、 the TP of CTL waveform in both positive (+) and negative () directions in 3 ms increments. 5. Refer to the figure below. Read the level of portion (a) of the waveform. If the waveform is serrated at point (a), adjust the level so that the serrations are as smooth as possible (refer to the second fi

11、gure). FM Waveform (Maximum Output) Normal Waveform Examples Ideal FM envelope a abd ce Minimum levelMaximum level X?|?W?V?A?W?X?g? X position Adjusting Jig MV-8080G_5(616)97.12.11, 9:36Page 11Adobe PageMaker 6.0J/PPC 12 5-2. ADJUSTMENT 1. Connect the TP of PB ENV to the oscilloscope CH-1. At this t

12、ime, trigger the oscilloscope externally with the signal (RF Switching Pulse) from TP of RFS. 2. Play the test tape (Stairstep). 1.DRUM INPUT ADJUSTMENT 1. Observe the FM envelope output wave at the TP of PB ENV with the oscilloscope and press the CHANNEL /5 buttons in both positive (+) and negative

13、 () directions. 2. A of the following figure shows incorrect waveforms. With a standard screwdriver, adjust the transport guide roller to flatten the peak of the FM envelope waveform as shown in B. NOTES: 1. If the guide roller rotates freely, tighten the screw slightly. 2. Be sure to adjust the gui

14、de roller only by small increments at a time to avoid damaging the test tape. In addition to observing the waveform, make sure that there is no slipping of the tape or curling at the drum lead. = c a d a= c a e a 0.75 and 0.75 or 20 log= 2.5 dB and 20 log= 2.5 dB 0.75 or 20 log 2.5 dB = b a b a 6. A

15、s shown in the equation below, read the FM waveform value at point (b) and make sure that: 7. Read the values at points (c) and (d) drum input and output and make sure that: NOTES: 1. Read the minimum levels for (b), (c), and (d). 2. If above checks yield normal results, proceed to page MA-8 section

16、 “ADJUSTMENT”. 3. If defects are noted, perform the following FM envelope waveform adjustment. 2.FM ENVELOPE WAVEFORM ADJUSTMENT 1. As in the previous section, observe the FM waveform and press the CHANNEL /5 buttons. Waveform alterations must be nearly parallel to each other as shown in Figure “Nor

17、mal Waveform Examples” on page P.11. 2. If the waveform changes as shown in the figure below, adjustment is necessary. Abnormal Waveform Example Drum Input Adjustment Drum input AB Supply Guide RollerTape Tight Screw Supply Guide Roller MV-8080G_5(616)97.12.11, 9:36Page 12Adobe PageMaker 6.0J/PPC 13

18、 2. If there are waveforms as shown in A or B in the above figure, adjust the supply guide roller height so that the waveform appears as shown by E, F, or G in the figure below. At this time, if the waveform fluctuates, adjust to the point of minimum fluctuation. Minimum FM Output (Correct Examples)

19、 E F GTaper Parallel Taper Maximum AC DB NOTES: 1. Fine adjustments are not required at this time. It is sufficient if the tape is engaged with the guide and that the servo operates properly (control signal picked up). 2. If the tape separates from the take-up guide or wrinkling occurs, screw C must

20、 have been excessively tightened with respect to screw A and screw B, which is causing the Audio/CTL Head to incline forward or backward. Use care in adjusting screws B and C, and screw A evenly and observe that wrinkles are not produced at the take-up guide. 5-3. INTERCHANGEABILITY ADJUSTMENT 1. Ob

21、serve the FM envelope output waveform at the oscilloscope and press to adjust the CHANNEL /5 buttons in both positive(+) and negative(-) directions. Minimum FM Output (Incorrect Examples) 3. As shown in the figure below, adjust screws B and C and screw A to align the Audio/CTL Head height with the t

22、ape. Audio/CTL Head Height Drum output CD 2.DRUM OUTPUT ADJUSTMENT 1. Adjust the take-up guide roller so that the FM envelope output flattens as shown in D of the figure below. Drum Output Adjustment 2. If the tape separates from the guide or wrinkling occurs at the take-up guide, adjust by turning

23、screw C of the Audio/CTL Head as shown in the figure below. Take-up Guide ?“? ?K?C?h? ?l?W ABE ?“?e?v?K?C?h ?e?v ?e?v DC Tape Take-up Guide Roller Tape Take-up Guide Tight Screw Approx. 0.06mm Take-up Guide PoleReference line Tape CTL Head Audio Head MV-8080G_5(616)97.12.11, 9:36Page 13Adobe PageMak

24、er 6.0J/PPC 14 3. If the FM waveform appears as shown by C or D in the above figure, adjust the take-up guide roller height to obtain a waveform such as shown in E, F, or G. At this time, if the waveform fluctuates, adjust to the point of minimum fluctuation. 4. Vary the tracking control from maximu

25、m to minimum FM output. Perform fine adjustment of supply and take-up guide rollers so that waveform variation appears as shown in E, F, or G. 5-4. AUDIO/CTL HEAD HEIGHT, AZIMUTH AND SLANT Refer to 3-2 (P.9) for details regarding AUDIO/CTL HEAD HEIGHT AND AZIMUTH ADJUSTMENT. 5-5. SETSCREW TIGHTENING

26、 1. Check for maximum FM output waveform, maximum audio output, and be sure that there is no wrinkling on the tape or other transport irregularities. When finished, secure the guide rollers. (This must be performed in STOP mode.) 2. Because the guide rollers are easily moved, use care when securing.

27、 3. After tightening the screws, perform the final inter- changeability check. 5-6. FINAL INTERCHANGEABILITY CHECK Perform preliminary checks referring to section “PRE- LIMINARY CHECKS” on page P.11. E 1) Use a blank tape and set the VCR to REV mode. 2) Adjust the RG Post height adjusting screw E so

28、 that the tape runs along the lower flange of the Take-Up Guide. Tape 6. RG POST HEIGHT ADJUSTMENT RG Post Take-Up Guide MV-8080G_5(616)97.12.11, 9:36Page 14Adobe PageMaker 6.0J/PPC 15 7. FRONT LOADING ASSEMBLY ATTACHMENT To attach the Front Loading Assembly, follow the procedures below. 1) Twist th

29、e loading motor with your finger until it is in EJECT mode. 2) Twist the FD Pinion Gear counterclockwise until it stops. (The FD Face Gear is loose. ) 3) Twist the FD face Gear counterclockwise until it stops, then apply gentle pressure in the counterclockwise direction. 4) In the position at step 2

30、) , rotate the FD Pinion Gear clockwise. After about 3 1/2 turns, the FD Pinion Gear should begin to interlock with the FD Relay Gear. Now twist the FD Pinion Gear until it stops. (The assembly should now resemble Fig. 2) 5) Twist the FD Pinion Gear about 1/3 of a turn counterclockwise so that the L

31、ift Gear R attachment position is horizontal making attachment easier, as shown in Fig. 3. Also, the FD Relay Gear and FD Face Gear eye marks should be aligned when the MD is viewed from the back. (Fig. 4) 6) Attach the front assembly. Insert the first Lift Gear R between the first and second gear o

32、f the front assembly. (Fig. 3) Note: Do not touch the CSP plate of the Front Loading Assembly. (Take care not to distort it.) 4 2 3 Fig. 1 View from above the MDFig. 2Fig. 3 Lift Gear R FD Gear Case FD Face Gear FD Pinion Gear FD Gear Case FD Relay Gear Align first gear on Lift Gear R. Eye mark Fig.

33、4 MD Rear View CSP plate Front Loading Assy MV-8080G_5(616)97.12.11, 9:36Page 15Adobe PageMaker 6.0J/PPC 16 PERIODIC MAINTENANCE The following procedures are recommended for main- taining optimum performance and reliability of this video cassette recorder. CLEANING For cleaning, use a lint-free clot

34、h or gauze dampened with alcohol. TAPE TRANSPORT SYSTEM 1. The following components should be cleaned after every 500 hours of use. Impedance Roller Tension Post Transport Slide Post Supply Guide Roller Take-up Slide Post Take-up Guide Roller Video Head & Drum System Drum Ground Drum Motor Shaft Aud

35、io/CTL Head Pinch Roller Capstan Reverse Guide Post Full Erase Head Tape Guide F Post 2. Since the above parts come in direct contact with video tape, they tend to collect dust particles. If allowed to accumulate, dust may lead to damage to the video tape and above parts. 3. After cleaning with alco

36、hol, allow the parts to dry thoroughly before using a cassette tape. NOTE: When cleaning the two video heads on the upper drum, do not clean them with a vertical stroke. Use only a gentle back and forth motion in the direction of the tape path. REEL DRIVE SYSTEM 1. The following components should be

37、 cleaned after every 1000 hours of use. TOPBOTTOM Take-up Reel Table AssyCapstan Motor Pulley Supply Reel Table AssyClutch Pulley T Soft Brake AssyDrive Belt T Main Brake AssyC Brake S Main Brake Assy BT Band Assy 2. The above revolving parts are of rubber or come in direct contact with rubber parts

38、. Dust on rubber accumulates and interferes with proper operation. 3. Avoid using excessive alcohol when cleaning rubber parts. MV-8080G_5(616)97.12.11, 9:36Page 16Adobe PageMaker 6.0J/PPC 17 Description SERVICE SCHEDULE FOR MAIN COMPONENTS The following table lists the parts which should receive pe

39、riodic servicing at the recommended intervals. Periodic Service Schedule (operating hours) Ref. NoPart No. 1000 2000 3000 4000 5000 162D806501603Cylinder Assy for 59277GG 162D806501603Cylinder Assy for 59311GG 9062D806506301Pinch Roller Arm AssyGG 11662D806508303BT Band AssyGG 12862D806509302Clutch

40、AssyGG 13162D80650920Drive BeltGG 13262D806510301T Main Brake AssyGG 13362D806510302S Main Brake AssyGG 13462D806510303T Soft Brake AssyGG 6162D62041520A/C & EHead for 59277G 6162D62040324Audio/CTL Head for 59311G 8062D806505301T Reel Assy 8162D806505302S Reel Assy 10062D60030360Capstan Motor Assy 1

41、4262D806511303Loading Motor Assy Standard Service Periods Check and replace if necessary G Replace NOTE: Cleaning and replacement of the belts should be undertaken every 2 years even if the unit is not used frequently. MV-8080G_6(1718)97.12.11, 9:49Page 17Adobe PageMaker 6.0J/PPC 19 CASSETTE DECK ME

42、CHANISM 59277, 59311 Ref. No.TN Part No.ST Part No.Description 18065-01-60362D806501603CYLINDER ASSY 28065-01-30562D806501305V OUT PWB ASSY 36809-70-24362D680970243FPC4 CONNECTOR (C) 49P12-26-06462D9P1226064TAMS SCREW,2.6X6MM 58065-01-50162D806501501DRUM EARTH ASSY 69P04-26-04162D9P0426041TAPPING SC

43、REW,2.6X4MM 78065-01-231662D806501316DRUM MOTOR ASSY 89P02-26-15162D9P0226151TAMS SCREW 2.6X15 98065-01-31562D806501315ROTOR SCREW ASSY 109P04-30-05162D9P0430051TAPPING SCREW 3.0X5 208065-02-30162D806502301F POST METAL ASSY 218065-02-30362D806502303TAPE GUIDE BASE ASSY 228063-02-2362D80630223CASSETT

44、E GUIDE BOSS 238065-02-2162D80650221TAPE PROTECT 248065-02-30462D806502304TAPE GUIDE ASSY 308065-03-50262D806503502LOADING LEVER KASIME 318063-03-30562D806303305LOADING PLATE L ASSY 328065-03-30562D806503305LOADING PLATE R ASSY 339W06-50-11062D9W0650110HL WASHER,4.5X7X0.5(CUT) 348065-03-30362D806503

45、303L BLOCK L ASSY 358065-03-30462D806503304L BLOCK R ASSY 368063-03-0962D80630309ROLLER POST 378065-03-0462D80650304LOADING GEAR 388065-03-0562D80650305L GEAR PLATE 398065-03-1162D80650311L GEAR PLATE COLLOR 409W02-50-10062D9W0250100P.WASHER,2.1X5X0.5(CUT) 419W02-50-11062D9W0250110P.WASHER,2.6X6X0.5

46、(CUT) 428065-03-1062D80650310L GEAR PLATE SPRING 438065-03-0162D80650301LD CATCHER 449P04-26-05162D9P0426051SCREW,2.6X5MM 458065-03-30662D806503306HEAD CLEANING ASSY 468063-03-2962D80630329CLEANING ROLLER ASSY 479W02-30-05062D9W0230050P.WASHER,1.6X3.8X0.3(CUT) 489C17-20-23362D9C1720233CAMERA SCREW 2

47、 X2.3MM 608065-04-30262D806504302ACE HEAD BASE ASSY LOWER DECK (59277) FOR REC/PB 616204-15-2062D62041520ACE HEAD HVMZA1220 608065-04-30362D806504303AC HEAD BASE ASSY UPPER DECK (59311) FOR P.B. ONLY 616204-03-2462D62040324AC HEAD HVMZB1030 628000-06-0462D80000604AZIMUTH SPRING 638000-06-2662D800006

48、26AZIMUTH SPRING SCREW 649P09-30-06162D9P0930061SCREW,3X6MM(FIXING) 659P01-26-07262D9P0126072SCREW,2.6X7MM 668065-04-30162D806504301FE HEAD BASE ASSY 676209-15-0462D62091504VTR1X2ERS11107 LOWER DECK (59277) FOR REC/PB 688063-04-30662D806304306IMPEDANCE ROLLER ASSY 699W02-30-05062D9W0230050P.WASHER,1

49、.6X3.8X0.3(CUT) * MV-8080G_7(1921)97.12.11, 9:51Page 19Adobe PageMaker 6.0J/PPC 20 CASSETTE DECK MECHANISM 59277, 59311 Ref. No.TN Part No.ST Part No.Description 709W06-30-04062D9W0630040HL WASHER,1.55X4.5X0.3(CUT) 718065-04-0262D80650402HEAD BASE SPRING 808065-53-0162D806505301T REEL ASSY 818065-05-30262D806505302S REEL ASSY 829W03-30-11062D9W0330110NYLON WASHER 2.5X5X0.3 908065-06-30162D806506301PINCH ROLLER ARM ASSY 918065-06-0562D80650605PINCH ROLLER 929B01-26-04162D9B0126041SCREW,2.6X4MM 938