Jvc-DRMX-1-SEU-Service-Manual(1) 电路图 维修手册.pdf

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1、SERVICE MANUAL COPYRIGHT 2005 Victor Company of Japan, Limited No.YD048 2005/1 DVD / HDD VIDEO RECORDER 1) The idler gear is not meshed with the take-up reel gear because the mechanism mal-functions for some reason. 2) The idler gear is meshed with the take-up reel gear, but incapable of winding due

2、 to too large mechanical load (abnormal tension); 3) The reel is rotating normally but an FG pulse is not generated due to the take-up reel sensor failure. 2.The supply reel pulse is not generated in the REV transport modes (REV SEARCH/REW, etc.) because; 1) The idler gear is not meshed with the sup

3、ply reel gear because the mechanism mal-functions for some reason. 2) The idler gear is meshed with the supply reel gear, but incapable of winding due to too large a mechanical load (abnormal tension); 3) The reel rotates normally but the FG pulse is not generated due to a supply reel sensor failure

4、. 3.Power(SW5V) is not supplied to the reel sensor on the tape winding side. 1.The drum could not 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

5、. 2.The drum FG pulse did not reach the System controller CPU because; 1) The signal circuit is disconnected in the middle; 2) The FG pulse generator (hall device) of the drum is faulty. 3.The drum control voltage (DRUM CTL V) is not supplied to the MDA. 4.Power (M12V) is not supplied to the drum MD

6、A. 1.The cassette cannot be ejected due to a failure in the drive mechanism of the housing. 2.When the housing 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 temperature, etc.

7、), mechanism wear or failure. 3.The sensor/switch for detecting the end of ejection are not functioning normally. 4.The loading motor drive voltage is lower than specified or power (M12V) is not supplied to the motor (MDA). 5.When the user attempted to eject a cassette, a foreign object (or perhaps

8、the users hand) was caught in the opening of the housing. 1.The capstan could not start or the capstan rotation has stopped 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

9、the tape (occurrence of tape entangling, etc.). 2.The capstan FG pulse did not reach the System controller CPU because; 1) The signal circuit is disconnected in the middle; 2) The FG pulse generator (MR device) of the capstans is faulty. 3.The capstan control voltage (CAPSTAN CTL V) is not supplied

10、to the MDA. 4.Power (M12V, SW5V) are not supplied to the capstan MDA. 1.The SW 5 V power supply circuit is shorted with GND. 2.The SW 12 V power supply circuit is shorted with GND. 1. The DVD unit is defective. 2. Contact failure of the wires in the DVD unit or VHS side. 1. The FG sensor is defectiv

11、e. (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 soldering failure of the pins of the connector (board-to-board) to the FG sensor. 4. The power (5V) to the sensor is not supplied. (Connect

12、ion failure/soldering failure) 5. The FG pulse is not sent to the System Controller CPU. 6.The tilt motor is defective. (The soldered parts have separated.) 7. The drive power to the tilt motor is not supplied. (Connection failure/soldering failure) 8. The tilt motor drive MDA - IC is defective. 9.

13、Auto-recovery of the DD tilting cannot take place due to overrun. 1.The supply reel pulse is not generated in the FWD transport mode (PLAY/FWD SEARCH/FF, etc.) because; 1) PLAY/FWD or SEARCH/FF is started while the tape in the inserted cassette is cut in the middle; 2) A mechanical factor caused tap

14、e 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, so the pulse is not generated until then; 3) The reel is rotating normally but the FG pulse is not generated due to a supply reel

15、 sensor failure. 2.The 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 mechanical factor caused tape slack inside and outside the take-up reel side of the casset

16、te shell. In this case, the take up 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 reel is rotating normally but the FG pulse is not generated due to a take-up reel sensor failure. 3.The power (SW 5V) to a reel sensor

17、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 than 10 seconds, E:U1 is identified and re

18、corded in the emergency history. During the period in which the head clog is detected, the FDP shows U:01 and the OSD repeats the 3 seconds of warning display and the 7 seconds of noise picture display alternately. EMG code : E:C1 or E:U1 / FDP : U:01 / OSD : Try cleaning tape. or Use cleaning casse

19、tte. 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. EU1: Head clog warning history E0A: Supply Reel Pulse EMG E07: SW Power Short-Circuit EMG E06: Capstan FG EMG E05: Cassette Eject EMG E04

20、: Drum FG EMG E03: Take Up Reel Pulse EMG E02:Unloading EMG E01: Loading EMG E08:DVD EMG E09:DD FG EMG When communication with a system computer of VHS side is not carried out because of the defective DVD unit, or when the DVD unit must be reset 1-22 (No.YD048) 5.3.5EMG detail information The status

21、 (electrical operation mode) of the VCR and the status (mechanism operation mode/sensor information) of the mecha- nism in the latest EMG can be confirmed based on the figure in EMG detail information . FDP/OSD display *1 : *2 : 34 Note: For EMG detailed information , the content of the code that is

22、 shown on the display (or OSD) differs de- pending on the parts number of the system control mi- croprocessor (IC3001) of the VCR. The system control microprocessor parts number starts with two letters, re- fer these to the corresponding table. *1 : Deck operation mode *2 : Mechanism operation mode

23、*1: Deck operation mode at the moment of EMG *2: Mechanism operation mode at the moment of EMG 3-: Mechanism sensor information at the moment of EMG -4: Mechanism mode position at the moment of EMG Common table of MN* and HD 00-Mechanism being initialized 0100STOP with pinch roller pressure off (or

24、tape present with P.OFF) 0201STOP with pinch roller pressure on 03-POWER OFF as a result of EMG 0404PLAY (Normal playback) 0C0EREC 1011Cassette ejected 2022FF 21-Tape fully loaded, START sensor ON, short FF 22-Cassette identification FWD SEARCH before transition to FF (SPx7-speed) 2426FWD SEARCH (va

25、riable speed) including x2-speed 2C2EINSERT REC 4043REW 42-Cassette identification REV SEARCH before transition to REW (SPx7-speed) 4447REV SEARCH (variable speed) 4C4CAUDIO DUB 6C6EINSERT REC (VIDEO + AUDIO) 8484FWD STILL / SLOW 8585REV STILL / SLOW 8C8FREC PAUSE 8D-Back spacing 8E-Forward spacing

26、(FWD transport mode with BEST function) ACAFINSERT REC PAUSE AD-INSERT REC back spacing CCCDAUDIO DUB PAUSE CD-AUDIO DUB back spacing ECEFINSERT REC (VIDEO + AUDIO) PAUSE ED-INSERT REC (VIDEO + AUDIO) back spacing Display Deck operation mode MN*HD* Table of MN* DisplayMechanism operation mode 00Comm

27、and standby (No command to be executed) 01Immediate Power OFF after EMG occurrence 02Loading from an intermediate position during mechanism initialization 03Unloading due to EMG occurrence during mechanism initialization 04Ejecting cassette (ULSTOP to EJECT) 05Inserting cassette (EJECT to ULSTOP) 06

28、Loading tape (ULSTOP to PLAY) 07Unloading tape (PLAY to ULSTOP) 08Transition from pinch roller ON to STOP 09Transition from pinch roller OFF to STOP (PLAY to OFFSTOP) 0ATransition from pinch roller OFF to STOP at power OFF 0BTransition from pinch roller ON to STOP at power ON 0CTransition to PLAY 0D

29、Transition to Search FF 0ETransition to REC 0FTransition to FWD STILL/SLOW 10Transition to REV STILL/SLOW 11Transition to Search REV 12Transition from FF/REW to STOP 13Transition to FF 14Transition to REW 15Tape end detection processing during loading 16Short FWD/REV at tape sensor ON during unloadi

30、ng 17Transition to FF/REW brake mode Table of HD* DisplayMechanism operation mode 00STOP with pinch roller pressure off 01STOP with pinch roller pressure on 02U/L STOP (or tape being loaded) 04PLAY (Normal playback) 05PLAY (x1-speed playback using JOG) 0EREC 11Cassette ejected 22FF 26FWD SEARCH (var

31、iable speed) including x2-speed 2EINSERT REC 43REW 47REV SEARCH 4CAUDIO DUB 6EINSERT REC (VIDEO + AUDIO) 84FWD STILL/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 initiali

32、zed F1POWER OFF as a result of EMG F2Cassette being inserted F3Cassette being ejected F4Transition from STOP with pinch 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 F

33、7Cassette type detection SEARCH before FF/REW is being executed F8Tape being unloaded F9Transition from STOP with pinch 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 R

34、EC.P (T.REC,etc.) FCTransition from STOP with pinch roller pressure off to cassette type detection SEARCH FDShort REV being executed after END sensor on during unloading FETension loosening being executed after tape loading (STOP with pinch roller pressure on) FFTape being unloaded (No.YD048)1-23 3-

35、 : Mechanism sensor information -4 : Mechanism mode position 5.3.6EMG detail information The type of the cassette tape and the cassette tape winding po- sition can be confirmed based on the figure in EMG detail infor- mation . Note: EMG detail information is the reference information stored using th

36、e remaining tape detection function of the cassette tape. As a result, it may not identify cas- sette correctly when a special cassette tape is used or when the tape has variable thickness. *5 : Cassette tape type Notes: Cassette tape type is identified a few times during mode transition and the ide

37、ntification count is variable depending on the cassette tape type. If an EMG occurs in the middle of identification, the cassette tape type may not be able to be identified. If other value than those listed in the above table is dis- played, the cassette tape type is not identified. *6 : Cassette ta

38、pe winding position The cassette tape winding position at the moment of EMG is dis- played by dividing the entire tape (from the beginning to the end) in 21 sections using a hex number from “00” to “14”. *7 : Cassette tape type (Winding area) Note: The values of cassette tape type in the above table

39、 are typical values with representative cassette tapes. 5.3.7EMG detail information Three deck operation modes preceding the deck operation mode in which the EMG occurs may be confirmed based on the figures in the EMG information detail . For the contents of the dis- played information, see the tabl

40、e Deck operation mode in sec- tion 5.3.5 EMG detail information . Common table of MN* and HD* 0-Tab brokenONONON ON ON ON1-Tab brokenON 2-Tab brokenON 3-Tab brokenONOFF OFF OFF OFF OFF ON ON OFF OFF ON ON ON OFF 4-Tab presentON 5-Tab present 6-Tab presentOFF ON 7-Tab presentOFF OFF OFF OFF OFF 8-Tab

41、 brokenONON ON9-Tab brokenON ON ON A-Tab broken B-Tab brokenOFF OFF C-Tab presentON OND-Tab present E-Tab presentOFF F-Tab presentOFF OFF OFF OFFOFF OFF OFF Mechanism sensor information Display REC safety SWStart sensorEnd sensor Mechansim position sensor Tab broken = 0Sensor ON = 0Sensor ON = 0 Tab

42、 present = 1sensor OFF = 1Sensor OFF = 1 0Not established 1EJECTEJECT position 2EJECT EJECT1Intermodal position 3EJECT1EJECT1 position 4EJECT1 EJECT2Intermodal position 5EJECT2EJECT2 position 6EJECT2 ULSTOPIntermodal position 7ULSTOPULSTOP position 8ULSTOP UPPERIntermodal position 9UPPERLoading (unl

43、oading) tape AUPPER ONSTOPIntermodal position BONSTOPPLAY position CPLAY FWD/SSIntermodal position DFWD/SSFWD (FWD Still/Slow) position EFWD/SS REVIntermodal position FREVREV (REV Still/Slow) position 0REV OFFSTOPIntermodal position 1OFFSTOPPinch roller OFF position 2OFFSTOP FFREWBIntermodal positio

44、n 3FFREWBFF/REW Brake position 4FFREWB FFREWIntermodal position 5FFREWFF/REW position Common table of MN* and HD* Mechanism sensor information Dis play Deck operation mode Even number (0, 2, 4, 6, 8, A, C, E) Odd number (1, 3, 5, 7, 9, B, D, F) 00 : End of winding 14 : Beginning of winding FF : Tape

45、 position not identified DisplayCassette tape type 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) identi

46、fied/thin tape (T-160 to T-210) 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 ta

47、pe (TC-10 to TC-20) identified 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 Display Cassette tape type (Reference) Word data (Beginning) (End) 00 04 - 08 05 - 06 05 - 0C 06 -

48、0C 06 - 0C 07 - 08 09 - 0B 0C - 0D 0D - 0F 0E - 10 10 - 12 10 - 13 11 - 14 12 - 14 13 - 14 13 - 14 13 - 14 13 - 14 15 - 16 16 - 17 17 - 18 19 - 1B Cassette type not identified C cassette, thick tapeTC-10 Small reel, thick tapeT-20 C cassette, thick tapeTC-20P C cassette, thin tapeTC-40 C cassette, t

49、hin tapeTC-30 Small reel, thick tapeT-40 Small reel, thick tapeT-60 Small reel, thick tapeT-80(DF-160) Small reel, thick tapeT-90(DF-180) Small reel, thick tapeT-100 Small reel, thin tapeT-140 Small reel, thick tapeT-120(DF-240) Small reel, thick tapeT-130 Small reel, thin tapeT-160 Small reel, thin tapeT-210(DF-420) Small reel, thin tapeT-180(DF-360) Small reel, thin tapeT-168 Small reel, thick tapeDF-300 Large reelT-20 Large reelT-30 Large reelT-40 Large reelT-60 (0497 - 0506) (0732 - 0858) (05A9 - 0661) (0599 - 05FF) (0AA1 - 0C07) (0623 - 063D)(0C41 - 0CC3) (0611