JVC-MXJ570V-cs-sm维修电路原理图.pdf
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1、SERVICE MANUAL COPYRIGHT 2000 VICTOR COMPANY OF JAPAN, LTD. MX-J570V MX-J680V No.20853 Jul. 2000 COMPACT COMPONENT SYSTEM MX-J570V MX-J680V Safety precautions Important for laser products Preventing static electricity Precautions at disassembling and parts replacement Disassembly method Adjustment m
2、ethod 1-2 1-3 1-4 1-5 1-6 1-29 Diagnosis which uses extension wire method Flow of functional operation until TOC read Maintenance of laser pickup Replacement of laser pickup Description of major ICs 1-33 1-34 1-35 1-35 1-36 Contents Area Suffix US UX Singapore Saudi Arabia SUPER VIDEO TAPE A/B FADE
3、MUTING ON SCREEN NEXTPREV RMSMXJ570V REMOTE CONTROL SLEEPECHO SOUND MODE VOCAL MASKING REC START/STOP ACTIVE BASS EX. SUBTITLEHIGHLIGHT FM MODE STILLV.INTRO KEY CONTROL Each difference point Model CD/DECK/RECEIVERSPEAKER MX-J680V CA-MXJ680V MX-J570V CA-MXJ570VSP-MXJ570V SP-MXJ680V Color Tray fitting
4、 Silver Light blue Gray Silver TW2111A, Reverse ; TW2121A Fast Forward and Rewind ; TW2231A 9. Test disc : CTS-1000(12cm),GRG-1211(8cm) 10. Jitter meter Measurement conditions Power supply voltage AC110/127/220/230-240V(50Hz) Measurement output terminal : Speaker out :TP101(Mesuring for TUNER/DECK/C
5、D) :Dummy load 6ohm Radio input signal AM modulation frequency : 400Hz Modulation factor : 30% FM modulation frequency : 400Hz Frequency displacement : 22.5kHz Frequency Range AM531kHz1710kHz FM87.5MHz108MHz Standard measurement positions of volume and switch Power : Standby (Light STANDBY Indicator
6、) S,A,BASS : OFF Sound mode : OFF Main VOL. : 0 Minimum Travers mecha set position : Disc 1 Mic MIX VOL : MAX ECHO : OFF Precautions for measurement 1. Apply 30pF and 33kohm to the IF sweeper output side and 0.082 F and 100kohm in series to the sweeper input side. 2. The IF sweeper output level shou
7、ld be made as low as possible within the adjustable range. 3. Since the IF sweeper is a fixed device, there is no need to adjust this sweeper. 4. Since a ceramic oscillator is used, there is no need to perform any MPX adjustment. 5. Since a fixed coil is used, there is no need to adjust the FM track
8、ing. 6. The input and output earth systems are separated. In case of simultaneously measuring the voltage in both of the input and output systems with an electronic voltmeter for two channels, therefore, the earth should be connected particularly. 7. In the case of BTL connection amplifier, the minu
9、s terminal of speaker is not for earthing. Therefore, be sure not to connect any other earth terminal to this terminal. This system is of an OTL system. MX-J570V/MX-J680V 1-30 Arrangement of adjusting positions Cassette mechanism section (Mechanism A section)Cassette mechanism section (Back side) Ca
10、ssette mechanism unit section Head azimuth adjusting screw (Forward side) Head azimuth adjusting screw (Reverse side) Head azimuth adjusting screw (Forward side) Head azimuth adjusting screw (Reverse side) Playback head Playback,recording and eraser heads or playback head Tape speed ADJ Bias ADJ L B
11、ias ADJ R MX-J570V/MX-J680V 1-31 1.Playback the test tape TMT7036(10kHz). 2.With the playback mechanism or recording playback mechanism, adjust the head azimuth screw so that the forward and reverse output levels become maximum.After adjustment,lock the head azimuth at least by half a turn. 3.In eit
12、her case,this adjustment should be performed in both the forward and reverse directions with the head azimuth screw. Adjust VR301 so that the frequency counter reading becomes 3,000Hz60Hz when playing back the test tape VTT712(3kHz)with the playback mechanism or playback and recording mechanism afte
13、r ending forward winding of the tape. Confirmation of head angle Confirmation of tape speed Test tape :TMT7036(10kHz) Measurement output terminal :Speaker terminal Speaker R (Load resistor:3) :Headphone terminal Test tape :VTT712(3kHz) or TMT7036(3kHz) Measurement output terminal :Headphone terminal
14、 Maximum output Tape speed of decks (A and B) :3,000Hz 60Hz Adjust the head azimuth screw only when the head has been changed. VR301 ItemsMeasurement conditions Measurement method Standard values Adjusting positions Tape recorder section ItemsMeasurement conditions Measurement method Standard values
15、 Adjusting positions After setting to the double speed motor, confirm that the frequency counter reading becomes 4,800+400/-300Hz when the test tape VTT712 (3kHz) has been play back with the playback mechanism. When the test tape VTT712(3kHz) has been played back with the playback mechanism or recor
16、ding and playback mechanism at the beginning of forward winding, the frequency counter reading of the difference between both of the mechanisms should be 6.0Hz or less. When the test tape VTT712(3kHz) has been played back with the playback mechanism or recording and playback mechanism at the beginni
17、ng of forward winding the frequency counter reading of wow flutter should be 0.25 or less(WRMS). Double tape speed Difference between the forward and reverse speed. P.mecha and R/P mecha speed Wow flutter Test tape :TMT7036(10kHz) Measurement output terminal :Speaker terminal Speaker R (Load resista
18、nce:3) measurement output terminal :Headphone terminal Test tape :TMT7036(10kHz) Measurement output terminal :Headphone terminal 4,800+400/ -300Hz 60Hz or less with in 0.25% JIS(WTD) Playback mechanism side Both the playback and recording playback mechanism Both the playback and recording playback m
19、echanism Reference values for confirmation items MX-J570V/MX-J680V 1-32 ItemsMeasurement conditions Measurement method Standard values Adjusting positions 1.With the recording and playback mechanism, load the test tapes(AC-514 to TYP and AC-225 to TYP),and set the mechanism to the recording and paus
20、ing conditions in advance. 2.After connecting 100in series to the recorder head,measure the bias current with a valve voltmeter at both of the terminals. 3.After resetting the PAUSE mode,start recording. At this time,adjust VR101 for LcH and VR201 for RcH so that the recording bias current values be
21、come 4.0A (TYP) and 4.20A(TYP). 1.With the recording and playback mechanism,load the test tape(AC-514 to TYP),and set the mechanism to the recording and pausing condition in advance. 2.While repetitively inputting the reference frequency signal of 1kHz and 10kHz from OSC IN, record and playback the
22、test tape. 3.While recording and playing back the test tape in TYP,adjust VR101 for LcH and VR201 for RcH so that the output deviation between 1kHz and 10kHz becomes -1dB2dB. Adjustment of recording bias current (Reference value) Adjustment of recording and playback frequency characteristics *Mode :
23、 Forward or reverse mode *Recording mode *Test tape :AC-514 and AC-225 Measurement output terminal :Both recording and headphone terminals Reference frequency :1kHz and 10kHz (REF:-20dB) Test tape :TYPAC-514 Measurement input terminal :OSC IN AC-225 :4.20A AC-514 :4.0A Output deviation between 1kHz
24、and 10kH :-1dB2dB LcH :VR101 RcH :VR201 LcH :VR101 RcH :VR201 Electrical performance ItemsMeasurement conditions Measurement method Standard values Adjusting positions 1.While changing over to and from BIAS 1 and 2, confirm that the frequency is changed. 2.With the recording and playback mechanism.
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