JVC-DRDX5SE-dvd-sm 电路图 维修手册.pdf

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1、SERVICE MANUAL COPYRIGHT 2005 VICTOR COMPANY OF JAPAN, LIMITED No.YD085 2005/11 Mini DV with Viterbi OFF. Inter-channel difference: 10 times be- tween CH1 and CH2. Note 6 : It is desirable to use a brand-new tape or an unused section of tape. This is to assure the adjustment reliability because usin

2、g a damaged tape increases the error rate. 4.10.6 Error rate measuring method It is not necessary to use the error rate jig (YTU93083) or a fre- quency counter. The Service Support System Software displays the error rates of video CH1, CH2 and totals. When measuring the error rate of a channel, be s

3、ure to total the values of the video and the audio errors. Play the alignment tape, then set “ATF” (Auto Tracking Find) in “Deck Controller” of the SSS Software to ON. (Note 3) Connect an oscilloscope (CH: + Slope) and, while triggering it with the HID signal, observe the ENV OUT The linearity adjus

4、tment is complete if the PB ENV waveform is ideally stable and varies ideally according to the tracking variation. To close, play a prerecorded tape and check the audio and video. Is the PB ENV waveform ideally stable and does it vary ideally according to the tracking variation? Yes No Ensure that t

5、he ENV OUT waveform is linear and parallel, without a noticeable drop or variation in the overall level. If the waveform linearity is poor or there is a noticeable drop in level, adjust the guide roller by turning it with the roller driver. Set “ATF” (Auto Tracking Find) to OFF using “Deck Controlle

6、r” of the SSS Software (Note 4). Observe the ENV OUT waveform to confirm that the overall waveform balance and linearity levels vary in accordance with the tracking variation as shown in Fig. 4-10-4. Repeat above steps as required. PB ENV waveform Adjust variation in the parallelism HID waveform CH1

7、 CH2 The “PB Switching Point” in the Adjustment Utility of the SSS software is adjusted automatically. Load the alignment tape. While playing the recorded signal, adjust “VCO Center Frequency (ME SP)” or “VCO Center Frequency (ME LP)” in “Deck Section” of the Adjustment Utility. To adjust VCO Center

8、 Frequency (ME SP) : Set Viterbi OFF. To adjust VCO Center Frequency (ME LP) : Set Viterbi ON. Record for about 5 minutes. (Note 6) The error rate adjustment is complete when the minimum error rate which is no higher than the typical value is obtained. (Note 5) Is the obtained error rate minimum (al

9、most the typical value)? Yes No 1-32 (No.YD085) 4.11 Electrical adjustment (DV SECTION) 4.11.1 Precautions (1) The DV section of this model is based on a special adjust- ment method using a PC. However, ordinary adjustment is required only when the part listed below has been re- placed. In this case

10、, the adjustment should be performed by a service center equipped with the required facilities. E2 PROM (IC1504 on DV main board) In case of trouble with the electrical circuitry, First identify the faulty position with a measuring tool as described be- low. Proceed to repair, replacement and/or adj

11、ustment only after the troubleshooting. (2) When observing a chip TP, use an IC clip or similar tool to protect the chip against stress. When replacing a chip part (IC, particularly), remove solder completely before replac- ing. (This is to prevent separation of the pattern.) (3) The connectors are

12、fragile. Be careful when plugging or un- plugging a wire. 4.11.2 Equipment required for adjustment Personal computer (Windows compatible) Color monitor Oscilloscope (2-CH, 100 MHz or more) Frequency counter 4.11.3 Tools required for adjustments Fig.4-11-1 4.11.4 Setup 1. Setup for computer adjustmen

13、t - Setup by extending the jig connector - Fig.4-11-2 Alignment tape US : MC-1 PAL : MC-2 SSS software PTU94016-5 Guide driver YTU94085 Jig connector cable PTU94018B PC cable US : QAM0099-002 PAL : QAM0099-005 Jig RCU PTU94023B DV MAIN PWB CN2001 CN1501 CN1503 CN3701 Service Support Software RS-232C

14、 Port PC Cable Personal Computer JVC MENU -Setup by extending the jig connector- Connect the Jig Connector Cable and setup the SSS software. It automatically becomes the TCCS mode and TCCS is displayed on the FDP. To cancel the TCCS mode, press the CANCEL button of the remote control unit. The TCCS

15、display on the FDP disappears. (No.YD085)1-33 4.12 Electrical adjustment (DVD SECTION) Note: The following adjustment procedures are not only necessary after replacement of consumable mechanical parts or board assemblies, but are also provided as references to be referred to when servicing the elect

16、rical circuitry. In case of trouble with the electrical circuitry, always begin a service by identifying the defective points by using the measur- ing instruments as described in the following electrical adjust- ment procedures. After this, proceed to the repair, replacement and/or adjustment. If th

17、e required measuring in- struments are not available in the field, do not change the ad- justment parts (variable resistor, etc.) carelessly. 4.12.1 DVD Video circuit Note When perform these adjustments, set the unit to DVD mode.(DVD lamp lights up) 4.12.1.1 EE Composite Y level (1) Observe the V OU

18、T waveform at the measuring point (D). (2) Set the VCR to the EVR mode by transmitting the code (F1) from the Jig RCU. (3) Set the EVR address to (F2) by transmitting the code (F3) from the Jig RCU. (4) Transmit the code (F4) from the Jig RCU to adjust so that the Y level of the V OUT waveform becom

19、es the specified value (G). (5) Release the EVR mode of the VCR by transmitting the code (F5) from the Jig RCU again. (When the EVR mode is released, the adjusted data is memorized.) Fig.4-12-1 EE composite Y level 4.12.1.2 EE Y level (1) Observe the V OUT waveform at the measuring point (D). (2) Se

20、t the VCR to the EVR mode by transmitting the code (F1) from the Jig RCU. (3) Set the EVR address to (F2) by transmitting the code (F3) from the Jig RCU. (4) Transmit the code (F4) from the Jig RCU to adjust so that the Y level of the V OUT waveform becomes the specified value (G). (5) Release the E

21、VR mode of the VCR by transmitting the code (F5) from the Jig RCU again. (When the EVR mode is released, the adjusted data is memorized.) Fig.4-12-2 EE Y level 4.12.1.3 EE composite burst level (1) Observe the V OUT waveform at the measuring point (D). (2) Set the VCR to the EVR mode by transmitting

22、 the code (F1) from the Jig RCU. (3) Set the EVR address to (F2) by transmitting the code (F3) from the Jig RCU. (4) Transmit the code (F4) from the Jig RCU to adjust so that the burst level of the V OUT waveform becomes the spec- ified value (G). (5) Release the EVR mode of the VCR by transmitting

23、the code (F5) from the Jig RCU again. (When the EVR mode is released, the adjusted data is memorized.) Signal(A) Internal colour bar Mode(B) EE Equipment(C) Oscilloscope Measuring point (D) L-1 connector pin19 EVR mode EVR address (F1) (F2) (F3) (F4) (F5) Jig code “43-95” ADJUST01 : * Jig code “43-2

24、1” Jig code “43-18” or “43-19” (Channel +/-) Jig code “43-3C” Specified value(G) 1.00 0.02 Vp-p (terminated) Adjustment tool (H) Jig RCU PTU94023B Specified value (G) H. rate Signal(A1) (A2) Ext. input Color (colour) bar signal Mode(B) EE Equipment(C) Oscilloscope Measuring point (D) L-1 connector p

25、in19 EVR mode EVR address (F1) (F2) (F3) (F4) (F5) Jig code “43-95” ADJUST02 : * Jig code “43-22” Jig code “43-18” or “43-19” (Channel +/-) Jig code “43-3C” Specified value(G) 1.00 0.02 Vp-p (terminated) Adjustment tool (H) Jig RCU PTU94023B Signal(A) Internal colour bar Mode(B) EE Equipment(C) Osci

26、lloscope Measuring point (D) L-1 connector pin19 EVR mode EVR address (F1) (F2) (F3) (F4) (F5) Jig code “43-95” ADJUST00 : * Jig code “43-20” Jig code “43-18” or “43-19” (Channel +/-) Jig code “43-3C” Specified value(G) 0.30 0.01 Vp-p (terminated) Adjustment tool (H) Jig RCU PTU94023B Specified valu

27、e (G) H. rate 1-34 (No.YD085) Fig.4-12-3 EE composite burst level 4.12.1.4EE R/G/B level (1) Observe the R OUT waveform at the measuring point (D1). (2) Set the VCR to the EVR mode by transmitting the code (F1) from the Jig RCU. (3) Set the EVR address to (F2) by transmitting the code (F3) from the

28、Jig RCU. (4) Transmit the code (F4) from the Jig RCU to adjust so that the R level of the R OUT waveform becomes the specified value (G). (5) Release the EVR mode of the VCR by transmitting the code (F5) from the Jig RCU again. (When the EVR mode is released, the adjusted data is memorized.) (6) Obs

29、erve the G OUT waveform at the measuring point (D2). (7) Repeat steps (2) to (5) above. (8) Observe the B OUT waveform at the measuring point (D3). (9) Repeat steps (2) to (5) above. Fig.4-12-4 EE R/G/B level 4.12.1.5EE COMPONENT PB/CB level (1) Observe the CB OUT waveform at the measuring point (D)

30、. (2) Set the VCR to the EVR mode by transmitting the code (F1) from the Jig RCU. (3) Set the EVR address to (F2) by transmitting the code (F3) from the Jig RCU. (4) Transmit the code (F4) from the Jig RCU to adjust so that the CB level of the CB OUT waveform becomes the speci- fied value (G). (5) R

31、elease the EVR mode of the VCR by transmitting the code (F5) from the Jig RCU again. (When the EVR mode is released, the adjusted data is memorized.) Fig.4-12-5 EE component PB/CB level 4.12.2 Syscon circuit 4.12.2.1Timer clock (1) Connect the frequency counter to the measuring point (D1). (2) Conne

32、ct the short wire between the short point (D2) and Vcc (5V). (3) Short the leads of capacitor (D3) once in order to reset the microprocessor of the Syscon. (4) Disconnect the short wire between the short point (D2) and Vcc then connect it again. (5) Adjust the Adjustment part (F) so that the output

33、frequency becomes the specified value (G). Signal(A) Internal colour bar Mode(B) EE Equipment(C) Oscilloscope Measuring point (D1) (D2) (D3) L-1 connector pin15(R) L-1 connector pin11(G) L-1 connector pin7(B) EVR mode EVR address (F1) (F2) (F3) (F4) (F5) Jig code “43-95” ADJUST05 : * Jig code “43-25

34、” Jig code “43-18” or “43-19” (Channel +/-) Jig code “43-3C” Specified value(G) 0.70 0.02 Vp-p (terminated) Adjustment tool (H) Jig RCU PTU94023B Specified value (G) R/G/B level Signal(A) Internal colour bar Mode(B) EE Equipment(C) Oscilloscope Measuring point (D) COMPONENT PB/CB terminal EVR mode E

35、VR address (F1) (F2) (F3) (F4) (F5) Jig code “43-95” ADJUST06 : * Jig code “43-26” Jig code “43-18” or “43-19” (Channel +/-) Jig code “43-3C” Specified value(G) 0.70 0.02 Vp-p (terminated) Adjustment tool (H) Jig RCU PTU94023B Signal(A) No signal Mode(B) EE Equipment(C) Frequency counter Measuring p

36、oint (D1) (D2) (D3) IC3001 pin 61 IC3001 pin 17 C3026 + and - Adjustment part (F) C3025 (TIMER CLOCK) Specified value(G) 1024.008 0.01 Hz (976.5549 0.0010 usec) PB/CB level (No.YD085)1-35 SECTION 5 TROUBLESHOOTING 5.1Manually removing the cassette tape If a loaded cassette tape cannot be ejected due

37、 to a failure in the electrical circuitry, take the cassette tape out using the following procedure. However, this method consists of a forced driving of the loading motor. Therefore, the following description assumes that there is no trouble in the mechanism operations. (1) Unplug the power plug fr

38、om the power outlet, then remove the top cover. (2) Apply 3 V DC to the electrodes (Red wire: + pole. Brown wire: - pole) on the upper part of the loading motor to per- form the unloading operation so that the pole base assem- blies are returned on the inner side of the tape. At this time, the exit

39、guide arm assembly should return toward the drum assembly and the mechanism should enter the C-IN mode. As the tape is left without winding, be careful not to damage the tape or leave grease on it. (3) If the tape is slack, wind it up by turning the shaft on the top- side of the capstan motor in the

40、 direction of the arrow using a pointed tool (chip IC replacement jig).This operation may be difficult because the shaft is located below the housing motor of the cassette housing assembly. Be careful not to damage parts during it. (4) After confirming that the tape is fully wound up, take out the c

41、assette tape by turning the gear of the cassette housing assembly in the direction of the arrow. Note : After ejecting the tape, check that grease or similar foreign material is not attached to the wound tape. Also perform sim- ilar checking for the mechanism assembly, particularly the tape transpor

42、t system. Fig.5-1a Motor bracket assembly (Loading motor) Exit guide arm assembly Cassette housing motor Wire (Brown) DC 3 V + Shaft Capstan motor Capstan motorCassette housing assembly, side view 3 Tape winding4 Tape ejection Gear Ejection direction Chip IC replacement jig Wire (Red) Rotary encoder

43、 assembly Cassette housing assembly Pole base assembly (Supply) Pole base assembly (Take up) A A B B 1-36 (No.YD085) 5.2Manually removing the disk(DVD/CD) If you cannot remove the disk which is loaded because of any electrical or mechanical failures, manually remove it by taking the following steps.

44、 5.2.1Method 1 (1) AC Plug is pulled out at once and inserted again. (2) It is displayed on FDP as LOADING, and while it blinks, pushing the OPEN/CLOSE button is continued. (3) After a while, a tray opens (About 20 seconds). (4) After removed a disk, press the OPEN/CLOSE button again to close the tr

45、ay. (5) The LOADING blink display of FDP disappears and it will be in a standby mode. (6) If the POWER button is pushed, it will usually be operating. 5.2.2Method 2 (1) Unplug the ACpower cord from the AC outlet. (2) Remove the top cover and front panel assembly. (Refer to the disassembly procedure

46、and perform the dis- assembly of the major parts before removing) (3) Pass a thin wire through a hole in the DVD unit. (4) The disc tray comes out slightly. Take out the disc tray manually.(See Fig.5-2a) Fig.5-2a 5.3 Emergency display function (DV SECTION) This unit saves details of the last emergen

47、cy as the EMG history and allows the status of the unit and the mechanism each emer- gency to be shown both on the display and as OSD information. When using the emergency function, it is required to set the unit to the Jig RCU mode. Fig.5-3a Jig RCU PTU94023B 5.3.1Displaying the EMG information The

48、 EMG detail of information can be displayed by transmitting the code 43-59 from the Jig RCU. Note: Press DV/HDD/DVD on the unit repeatedly or DV on the remote so that the DV lamp lights up on the unit. The EMG detail information show the informa- tion on the latest EMG. It becomes - - : - - : - - wh

49、en there is no latest EMG record. EMG display of FDP display mode (1) Transmit the code “43-59” from the Jig RCU. The FDP shows the EMG content in the form of “E:*:*”. (2) Transmit the code 43-59 from the Jig RCU again. The FDP shows the EMG detail information in the form of DD and EE. (3) Transmit the code 43-59 from the Jig RCU once again. The FDP shows the EMG detail information in the form of FF and GG. (4) Transmit the code 43-59 from the Jig RCU once again. The FDP shows the EMG detail information in the