Jvc-HMHDS-1-U-Service-Manual 电路图 维修手册.pdf

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1、SERVICE MANUAL No. 82853 April 2001 HM-HDS1U SPECIFICATIONS HDD / VHS DUAL RECORDER Printed in Japan This service manual is printed on 100% recycled paper. COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD. HM-HDS1U No. 82853 JVC SERVICE 1) The idler gear is not meshed with the take-up reel gear; 2) The i

2、dler gear is meshed with the take-up reel gear, but incapable of wind- ing due to too large mechanical load (abnormal tension); 3) The take-up reel sensor does not output the FG pulse. 2The supply reel pulse is not generated in the REV transport modes (REV SEARCH/REW, etc.) because; 1) The idler gea

3、r is not meshed with the supply reel gear. 2) The idler gear is meshed with the supply reel gear, but incapable of wind- ing due to too large a mechanical load (abnormal tension); 3) The supply reel sensor does not output the FG pulse. 3Power is not supplied to the reel sensors. 1The drum could not

4、start or the drum rotation has stopped due to too large a load on the tape, because; 1) The tape tension is abnormally high; 2) The tape is damaged or a foreign object (grease, etc.) adheres to the tape. 2The drum FG pulse did not reach the System controller CPU because; 1) The signal circuit is dis

5、connected in the middle; 2) The FG pulse generator (hall device) of the drum is faulty. 3The drum control voltage (DRUM CTL V) is not supplied to the MDA. 4Power is not supplied to the drum MDA. 1The cassette cannot be ejected due to a failure in the drive mechanism of the housing. 2When the housing

6、 load increases during ejection, the loading motor is stopped because of lack of headroom in its drive torque. Housing load increasing factors: Temperature environment (low tempera- ture, etc.), mechanism wear or failure. 3The sensor/switch for detecting the end of ejection are not functioning norma

7、lly. 4The loading motor drive voltage is lower than specified or power is not sup- plied to the motor (MDA). 5When the user attempted to eject a cassette, a foreign object (or perhaps the users hand) was caught in the opening of the housing. 1The capstan could not start or the capstan rotation has s

8、topped due to too large a load on the tape, because; 1) The tape tension is abnormally high (mechanical lock); 2) The tape is damaged or a foreign object (grease, etc.) is adhered to the tape (occurrence of tape entangling, etc.). 2The capstan FG pulse did not reach the System controller CPU because

9、; 1) The signal circuit is disconnected in the middle; 2) The FG pulse generator (MR device) of the capstans is faulty. 3The capstan control voltage (CAPSTAN CTL V) is not supplied to the MDA. 4Power is not supplied to the capstan MDA. 1The SW 5 V power supply circuit is shorted with GND. 2The SW 12

10、 V power supply circuit is shorted with GND. 1 HDD is defective 2 KBUS_DATA signal is disconnected in the middle. 1 The FG sensor is defective. (The soldered parts have separated.) 2 The pull-up resistor at the FG sensor output is defective. (The soldered parts have separated.) 3 Contact failure or

11、soldering failure of the pins of the connector (board-to-board) to the FG sensor. 4 The power to the sensor is not supplied. (Connection failure/soldering failure) 5 The FG pulse is not sent to the System Controller CPU. 6The tilt motor is defective. (The soldered parts have separated.) 7 The drive

12、power to the tilt motor is not supplied. (Connection failure/soldering failure) 8 The tilt motor drive MDA - IC is defective. 9 Auto-recovery of the DD tilting cannot take place due to overrun. 1The supply reel pulse is not generated in the FWD transport mode (PLAY/ FWD SEARCH/FF, etc.) because; 1)

13、PLAY/FWD or SEARCH/FF is started while the tape in the inserted cas- sette is cut in the middle; 2) A mechanical factor caused tape slack inside and outside the supply reel side of the cassette shell. In this case, the supply reel will not rotate until the tape slack is removed by the FWD transport,

14、 so the pulse is not generated until then; 3) The FG pulse output from the supply reel sensor is absent. 2The take-up reel pulse is not generated in the REV transport mode (REV SEARCH/REW, etc.). 1) REV SEARCH/REW is started when the tape in the inserted cassette has been cut in the middle; 2) A mec

15、hanical factor caused tape slack inside and outside the take-up reel side of the cassette shell. In this case, the supply reel will not rotate until the tape slack is removed by the REV transport, so the pulse will not be generated until that time; 3) The FG pulse output from the take-up reel sensor

16、 is absent. 3The power to a reel sensor is not supplied. FDPCONTENTCAUSE Presupposing the presence of the control pulse output in the PLAY mode, when the value obtained by mixing the two V.FM output channels (without regard to the A.FM output) has remained below a certain threshold level for more th

17、an 10 seconds, E:C1 or E:U1 is identified and recorded in the emergency history. During the period in which a head clog is detected, the FDP and OSD repeat the “3-second warning display” and “7-second noise picture display” alternately. EMG code : “E:C1” or “E:U1” / FDP : “U:01” / OSD : “Try cleanin

18、g tape.” or “Use cleaning cassette.” The head clog warning is reset when the above-mentioned threshold has been exceeded for more than 2 seconds or the mode is changed to another mode than PLAY. EC1 or EU1: Head clog warning E0A:Supply Reel Pulse EMG E07:SW Power Short-Circuit EMG E06:Capstan FG EMG

19、 E05:Cassette Eject EMG E04: Drum FG EMG E03:Take Up Reel Pulse EMG E02:Unloading EMG E01:Loading EMG E08:HDD Communica- tion EMG E09:DD FG EMG 1-14 1.11.4 Emergency detail information 1 The status (electrical operation mode) of the VCR and the sta- tus (mechanism operation mode/sensor information)

20、of the mechanism in the latest emergency can be confirmed based on the figure in EMG detail information 1 . FDP display *1 : *2 : 34 *1 : Deck operation mode at the moment of emergency *2 :Mechanism operation mode at the moment of emergency 3 : Mechanism sensor information at the moment of emergency

21、 4:Mechanism mode position at the moment of emergency Note: In the Deck operation mode/Mechanism operation mode/ Mechanism mode position, the contents of the code that is shown on the FDP differs depending on the parts number of the System Control microprocessor (IC3001) of the VCR. For the micropro

22、cessor parts number that starts with the two letters “MN”, refer to the Table of MN and for parts number with “HD”, refer to the Table of HD. *1 : Deck Operation Mode Table of MN DisplayDeck Operation Mode 00Mechanism being initialized 01STOP with pinch roller pressure off (or tape present with P.OF

23、F) 02STOP with pinch roller pressure on 03POWER OFF as a result of EMG 04PLAY 0CREC 10Cassette ejected 20FF 21Tape fully loaded, START sensor ON, short FF 22Cassette identification FWD SEARCH before transition to FF (SP x7-speed) 24FWD SEARCH (variable speed) including x2-speed 2CINSERT REC 40REW 42

24、Cassette identification REV SEARCH before transition to REW (SP x7-speed) 44REV SEARCH (variable speed) 4CAUDIO DUB 6CINSERT REC (VIDEO + AUDIO) 84FWD STILL/SLOW 85REV STILL/SLOW 8CREC PAUSE 8DBack spacing 8EForward spacing (FWD transport mode with BEST function) ACINSERT REC PAUSE ADINSERT REC Back

25、 spacing CCAUDIO DUB PAUSE CDAUDIO DUB Back spacing ECINSERT REC (VIDEO + AUDIO) PAUSE EDINSERT REC (VIDEO + AUDIO) Back spacing *2 : Mechanism Operation Mode Table of MN DisplayMechanism Operation Mode 00Command standby (Status without executing command) 02POWER OFF by EMG occurrence 04Moving to th

26、e adjacent position in the LOAD direction 06Moving to the adjacent position in the UNLOAD direction 08Cassette ejection being executed 0ACassette insertion being executed 0CTape being loaded 0ETape being unloaded 10Mode transition to STOP with pinch roller compression ON 12Mode transition to STOP wi

27、th pinch roller compression OFF 14Mode transition to STOP with pinch roller compression OFF as a result of POWER OFF 16Mode transition to STOP with pinch roller compression ON as a result of POWER ON 18Mode transition to PLAY 1AMode transition to FWD SEARCH 1CMode transition to REC 1EMode transition

28、 to FWD STILL/SLOW 20Mode transition to REV STILL/SLOW 22Mode transition to REV SEARCH 24Mode transition from FF/REW to STOP 26Mode transition to FF 28Mode transition to REW 2A4 sec. of REV as a result of END sensor going ON during loading 2CShort FF/REV as a result of tape sensor going ON during un

29、loading 2EMechanism position being corrected due to overrun 80Mechanism in initial position (Dummy command) Table of HD DisplayDeck Operation Mode 00STOP with pinch roller pressure off (or tape present with P.OFF) 01STOP with pinch roller pressure on 04PLAY 0EREC 11Cassette ejected 22FF 26FWD SEARCH

30、 (variable speed) including x2-speed 2EINSERT REC 43REW 47REV SEARCH (variable speed) 4CAUDIO DUB 6EINSERT REC (VIDEO+AUDIO) 84FWD STILL/SLOW 85REV STILL/SLOW 8FREC PAUSE AFINSERT REC PAUSE CDAUDIO DUB PAUSE EFINSERT REC (VIDEO+AUDIO) PAUSE Table of HD DisplayMechanism Operation Mode 00STOP with pin

31、ch roller pressure off 01STOP with pinch roller pressure on 02U/L STOP (or tape being loaded) 04PLAY 05PLAY (x1-speed playback using JOG) 0EREC 11Cassette ejected 22FF 26FWD SEARCH (variable speed) including x2-speed 2EINSERT REC 43REW 47REV SEARCH 4CAUDIO DUB 6EINSERT REC (VIDEO + AUDIO) 84FWD STIL

32、L/SLOW 85REV STILL/SLOW 8FREC PAUSE AFINSERT REC PAUSE C7REV SEARCH (x1-speed reverse playback using JOG) CDAUDIO DUB PAUSE EFINSERT REC (VIDEO + AUDIO) PAUSE F0Mechanism being initialized F1POWER OFF as a result of EMG F2Cassette being inserted F3Cassette being ejected F4Transition from STOP with p

33、inch roller pressure on to STOP with pinch roller pressure off F5Transition from STOP with pinch roller pressure on to PLAY F6Transition from STOP with pinch roller pressure on to REC F7Cassette type detection SEARCH before FF/REW is being executed F8Tape being unloaded F9Transition from STOP with p

34、inch roller pressure off to STOP with pinch roller pressure on FATransition from STOP with pinch roller pressure off to FF/REW FBTransition from STOP with pinch roller pressure off to REC.P (T.REC,etc.) FCTransition from STOP with pinch roller pressure off to cassette type de- tection SEARCH FDShort

35、 REV being executed after END sensor on during unloading FETension loosening being executed after tape loading (STOP with pinch roller pressure on) 1-15 3 : Mechanism Sensor Information Common table of MN and HD Display Mechanism Sensor Information S-VHS SWREC SAFETY SWSTART SENSOREND SENSOR 0VHSTab

36、 brokenONON 1VHSTab brokenONOFF 2VHSTab brokenOFFON 3VHSTab brokenOFFOFF 4VHSTab presentONON 5VHSTab presentONOFF 6VHSTab presentOFFON 7VHSTab presentOFFOFF 8S-VHSTab brokenONON 9S-VHSTab brokenONOFF AS-VHSTab brokenOFFON BS-VHSTab brokenOFFOFF CS-VHSTab presentONON DS-VHSTab presentONOFF ES-VHSTab

37、presentOFFON FS-VHSTab presentOFFOFF *6 : Cassette tape winding position The cassette tape winding position at the moment of EMG is displayed by dividing the entire tape (from the beginning to the end) in 22 sections using a hex number from “00” to “15”. “00”: End of winding “15”: Beginning of windi

38、ng “FF” : Tape position not identified 4 : Mechanism Mode Position Table of MN DisplayMechanism Mode Position -0Initial value -1EJECT position -2Housing operating -3U/L STOP position -4Tape being loaded/unloaded (When the pole base is located on the front side of the position just beside the drum) -

39、5Tape being loaded/unloaded (When the pole base is located on the rear side of the position just beside the drum) -6Pole base compressed position -7FF/REW position -8Between FF/REW and STOP with pinch roller compression ON -9STOP with pinch roller compression OFF -ABetween STOP with pinch roller com

40、pression OFF and REV -BREV (REV STILL/SLOW) position -CBetween REV and FWD -DFWD (FWD STILL/SLOW) position -EBetween FWD and PLAY -FPLAY position Table of HD DisplayMechanism Mode Position 0EJECT position 1U/L STOP position 2Tape being loaded/unloaded (When the pole base is located on the rear side

41、of the position just beside the drum) 3FF/REW position 4STOP with pinch roller pressure off 5REV (REV STILL/SLOW) position 6FWD (FWD STILL/SLOW) position, PLAY position 7Intermediate position during transition between other mechanism modes Note: As the display is always “7” at any intermediate posit

42、ion between mechanism modes, the position of transitory EMG may sometimes not be locatable. Note: The values of cassette tape type 2 in the above table are typical values with representative cassette tapes. * 7 : Cassette tape type 2 (Winding area) DisplayCassette Tape Type 2 00Cassette type not ide

43、ntified 07Small reel, thick tapeT-5 08 - 0EC cassette, thick tapeTC-10 09 - 15C cassette, thick tapeTC-20P 0A - 0BSmall reel, thick tapeT-20 0A - 16C cassette, thin tapeTC-30 0A - 16C cassette, thin tapeTC-40 0D - 0FSmall reel, thick tapeT-40 11 - 14Small reel, thick tapeT-60 15 - 18Small reel, thic

44、k tapeT-80/DF-160 17 - 1ASmall reel, thick tapeT-80/DF-180 19 - 1DSmall reel, thick tapeT-100 1D - 21Small reel, thick tapeT-120/DF-240 1E - 1FSmall reel, thin tapeT-140 1F - 23Small reel, thick tapeT-130 21 - 23Small reel, thin tapeT-160 21 - 23Small reel, thin tapeT-168 22 - 24Small reel, thick ta

45、peDF-300 22 - 24Small reel, thin tapeT-180/DF-380 22 - 24Small reel, thin tapeT-210/DF-420 22 - 23Large reelT-5 23 - 24Large reelT-10 25 - 26Large reelT-20 27 - 29Large reelT-30 29 - 2BLarge reelT-40 2D - 2FLarge reelT-60 Notes: Cassette tape type 1 is identified a few times during mode transition a

46、nd the identification count is variable depending on the cassette tape type. If an EMG occurs in the middle of identi- fication, the cassette tape type may not be able to be identified. If other value than those listed in the above table is displayed, the cassette tape type is not identified. Displa

47、yCassette Tape Type 1 00Cassette type not identified 16Large reel/small reel (T-0 to T-15/T-130 to T-210) not classified 82Small reel, thick tape (T-120) identified/thin tape (T-140) identified 84Large reel (T-0 to T-60) identified 92Small reel, thick tape (T-130) identified/thin tape (T-160 to T-21

48、0) identified 93Small reel, thick tape/C cassette (T-0 to T-100/C cassette) not classified C3Small reel, thick tape/C cassette (T-0 to T-100/C cassette) being classified D3Small reel, thick tape/C cassette (T-0 to T-100/C cassette) being classified E1C cassette, thick tape (TC-10 to TC-20) identifie

49、d E2Small reel, thick tape (T-0 to T-100) identified E9C cassette, thin tape (TC-30 to TC-40) identified F1C cassette, thick tape/thin tape (TC-10 to TC-40) not classified *5 : Cassette tape type 1 Note: EMG detail information 2 is the reference information stored using the remaining tape detection function of the cassette tape. As a result, it may not identify cassette cor- rectly when a special cassette tape is used or when the tape has variable thickness. 1.11.5 Emergency detail information 2 The type of the cassette tape and the cassette tape winding po- sition can be confir