Jvc-HMDH-3000-Service-Manual 电路图 维修手册.pdf

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1、SERVICE MANUAL No. 82894 August 2001 HM-DH30000U SPECIFICATIONS D-VHS DIGITAL RECORDER Printed in Japan This service manual is printed on 100% recycled paper. COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD. HM-DH30000U No. 82894 JVC SERVICE 1) The idler gear is not meshed with the take-up reel gear; 2)

2、 The idler 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. 2.The supply reel pulse is not generated in the REV transport modes (REV SEARCH/REW, etc.) because; 1) The id

3、ler gear 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. 3.Power is not supplied to the reel sensors. 1.The drum c

4、ould 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. 2.The drum FG pulse did not reach the System controller CPU because; 1) The signal circ

5、uit 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 is not supplied to the drum MDA. 1.The cassette cannot be ejected due to a failure in the drive mechanism of the housing. 2.Wh

6、en 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 tempera- ture, etc.), mechanism wear or failure. 3.The sensor/switch for detecting the end of ejection are not fu

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

8、tan 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 the tape (occurrence of tape entangling, etc.). 2.The capstan FG pulse did not reach the System con

9、troller 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 to the MDA. 4.Power is not supplied to the capstan MDA. 1.The SW 5 V power supply circuit is shorte

10、d with GND. 2.The SW 12 V power supply circuit is shorted with GND. 1. The absolute value sensor is defective. (The soldered parts have separated.) 2. The pull-up resistor at the absolute sensor output is defective. (The soldered parts have separated.) 3. Contact failure or soldering failure of the

11、pins of the connector (board-to-board) to the absolute value sensor. 4.The absolute value sensor data is not sent to the System Controller CPU. 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 s

12、eparated.) 3. Contact failure or 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. 6.The tilt motor is defective. (The soldered

13、 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. 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

14、(PLAY/ FWD SEARCH/FF, etc.) because; 1) 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 tap

15、e slack is removed by the FWD transport, so the pulse is not generated until then; 3) The FG pulse output from the supply reel sensor is absent. 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 cass

16、ette has been cut in the middle; 2) A mechanical 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

17、pulse output from the take-up reel sensor is absent. 3.The 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 b

18、elow a certain threshold level for more than 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

19、“E:U1” / FDP : “U:01” / OSD : “Try cleaning 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

20、Power Short-Circuit EMG E06:Capstan FG EMG E05:Cassette Eject EMG E04: Drum FG EMG E03:Take Up Reel Pulse EMG E02:Unloading EMG E01:Loading EMG E08:DD Initialized (Absolute Position Sensor) EMG E09: DD FG EMG 1-9 1.8.4EMG detail information The status (electrical operation mode) of the VCR and the s

21、ta- tus (mechanism operation mode/sensor information) of the mechanism in the latest EMG can be confirmed based on the figure in EMG detail information . FDP/OSD display *1 : *2 : 34 *1 : Deck operation mode at the moment of EMG *2 : Mechanism operation mode at the moment of EMG 3 : Mechanism sensor

22、 information at the moment of EMG 4 : Mechanism mode position at the moment of EMG Note: For EMG detailed information , the content of the code that is shown on the FDP (or OSD) differs depending on the parts number of the system control microprocessor (IC3001) of the VCR. The system control micropr

23、ocessor parts number starts with two letters, refer these to the cor- responding table. *1 : Deck operation mode Common table of MN*, HD* and M3* 00-Mechanism being initialized 0100STOP with pinch roller pressure off (or tape present with P.OFF) 0201STOP with pinch roller pressure on 03-POWER OFF as

24、 a result of EMG 0404PLAY 0C0EREC 1011Cassette ejected 2022FF 21-Tape fully loaded, START sensor ON, short FF 22-Cassette identification FWD SEARCH before transition to FF (SP x7-speed) 2426FWD SEARCH (variable speed) including x2-speed 2C2EINSERT REC 4043REW 42-Cassette identification REV SEARCH be

25、fore transition to REW (SP x7-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 (FWD transport mode with BEST function) ACAFINSERT REC PAUSE AD-INSERT REC back spacing CCCDAUD

26、IO DUB PAUSE CD-AUDIO DUB back spacing ECEFINSERT REC (VIDEO + AUDIO) PAUSE ED-INSERT REC (VIDEO + AUDIO) back spacing *2 : Mechanism operation mode Common table of MN* and M3* Table of HD* DisplayMechanism operation mode 00STOP with pinch roller pressure off 01STOP with pinch roller pressure on 02U

27、/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 STILL/SLOW 85REV STILL/SLOW 8FREC PAUSE AFINSERT REC PAUSE C7REV SE

28、ARCH (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 pinch roller pressure on to STOP with pinch roller pressure off

29、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 pinch roller pressure off to STOP with pinch roller pressure on

30、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 REV being executed after END sensor on during unloading FETens

31、ion loosening being executed after tape loading (STOP with pinch roller pressure on) Display Deck operation mode MN*/M3*HD* 0000Command standby (Status without executing command) 0202POWER OFF by EMG occurrence 0404Moving to the adjacent position in the LOAD direction 0606Moving to the adjacent posi

32、tion in the UNLOAD direction 0808Cassette ejection being executed / Cassette housing ejection being executed -0AMode transition to STOP with cassette ejection end 0A0CCassette insertion being executed 0C0ETape being loaded 0E10Tape being unloaded 1012Mode transition to STOP with pinch roller compres

33、sion ON 1214Mode transition to STOP with pinch roller compression OFF 1416Mode transition to STOP with pinch roller compression OFF as a result of POWER OFF 1618Mode transition to STOP with pinch roller compression ON as a result of POWER ON 181AMode transition to PLAY 1A1CMode transition to FWD SEA

34、RCH 1C1EMode transition to REC 1E20Mode transition to FWD STILL / SLOW 2022Mode transition to REV STILL / SLOW 2224Mode transition to REV SEARCH 2426Mode transition from FF / REW to STOP 2628Mode transition to FF 282AMode transition to REW 2A2C4 sec. of REV as a result of END sensor going ON during

35、loading 2C2EShort FF / REV as a result of END sensor going ON during unloading 2E30Mechanism position being corrected due to overrun 8080Mechanism in initial position (Dummy command) Display Mechanism operation mode MN*M3* 1-10 -0-7-Initial value -1-0-EJECT position -0EJECT position (Cassette housin

36、g drive mode) -2-7-Housing operating -1Between EJECT and U / L STOP -3-1-2U / L STOP position -3Guide arm drive position -4-7-4Tape being loaded / unloaded (When the pole base is located on the front side of the position just beside the drum) -5-2-5Tape being loaded / unloaded (When the pole base is

37、 located on the rear side of the position just beside the drum) -6-7-6Pole base compressed position -7-3-FFF / REW position -8-7-FBetween FF / REW and STOP with pinch roller compres- sion ON -9-4-FSTOP with pinch roller compression OFF -A-7-EBetween STOP with pinch roller compression OFF and REV -B-

38、5-REV (REV STILL / SLOW) position -DREV position -CBetween REV and REV STILL / SLOW -BREV STILL / SLOW position -C-7-Between REV and FWD -ABetween REV STILL / SLOW and FWD STILL / SLOW -D-6-FWD (FWD STILL / SLOW) position -9FWD STILL / SLOW position -E-7-Between FWD and PLAY -8Between FWD STILL / SL

39、OW and PLAY -F-6-7PLAY position 0-VHSCassette insertionTab brokenONON 1-VHSCassette insertionTab brokenONOFF 2-VHSCassette insertionTab brokenOFFON 3-VHSCassette insertionTab brokenOFFOFF 4-VHSCassette insertionTab presentONON 5-VHSCassette insertionTab presentONOFF 6-VHSCassette insertionTab presen

40、tOFFON 7-VHSCassette insertionTab presentOFFOFF 8-S-VHSCassette ejectionTab brokenONON 9-S-VHSCassette ejectionTab brokenONOFF A-S-VHSCassette ejectionTab brokenOFFON B-S-VHSCassette ejectionTab brokenOFFOFF C-S-VHSCassette ejectionTab presentONON D-S-VHSCassette ejectionTab presentONOFF E-S-VHSCass

41、ette ejectionTab presentOFFON F-S-VHSCassette ejectionTab presentOFFOFF 3 : Mechanism sensor information Common table of MN*, HD* and M3* Mechanism sensor information Display MN* / HD*M3*REC safetyStartEnd S-VHS SWCASS SWSWsensorsensor *6 : Cassette tape winding position The cassette tape winding po

42、sition 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 winding “FF or ” : Tape position not identified 4 : Mechanism mode position Common table of MN*, HD* and M

43、3* Display Mechanism mode position MN* HD*M3* Note: The values of cassette tape type in the above table are typical values with representative cassette tapes. *7 : Cassette tape type (Winding area) DisplayCassette tape type 00Cassette type not identified 07Small reel, thick tapeT-5 08 - 0EC cassette

44、, 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, thick tapeT-80 / DF-160 17 - 1ASmall reel, thick tapeT-90

45、 / 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 tapeDF-300 22 - 24Small reel, thin tapeT-180 / DF

46、-360 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 is identified a few times during mode transition and the identification count is variable depen

47、ding 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. DisplayCassette tape type 00Cassette type not ident

48、ified 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-210) identified 93Small reel, thick tape/C casset

49、te (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) 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 *5 : Cassette tape type Note: EMG detail information is the reference information stored using the remaining tape detection function of