JVC-MXSK1-cs-sm维修电路原理图.pdf

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JVC-MXSK1-cs-sm维修电路原理图.pdf

SERVICE MANUAL COPYRIGHT 2004 VICTOR COMPANY OF JAPAN, LIMITED No.MB207 2004/4 COMPACT COMPONENT SYSTEM MB20720043 MX-SK1 TABLE OF CONTENTS 1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 2SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5 3DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6 4ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-30 5TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-34 COMPACT DIGITAL AUDIO COMPACT DIGITAL VIDEO PHONES ACTIVE BASS EX. EJECTEJECT DISC SELECT SELECT M X - S K 3 COMPACT DIGITAL VIDEO V O L U M E STANDBY/ON FM MODE AUX SLEEP FM/AM VIDEO INTRO PREV.NEXT HIGHLIGHT ON SCREEN SET ENTER RETURN PBCSTILLKEY CONTROL DISC 1DISC 2DISC 3DISC REPEATPROGRAM RANDOMPROGRAMCANCEL SOUND TURBO SOUND MODE ACTIVE BASS EX. TAPE-A KARAOKEMPX ECHO FADE MUTING TAPE-B VOLUME REMOTE CONTROL START/STOP REC CA-MXSK1SP-MXSK1SP-MXSK1 EE - Russian Federation Area suffix RadioFans.CN 收音机爱好者资料库 1-2 (No.MB207) SPECIFICATION Design TW2111A, Reverse ; TW2121A Fast Forward and Rewind ; TW2231A (9) Test disc : CTS-1000(12cm),GRG-1211(8cm) (10) Jitter meter 4.2Measurement conditions Power supply voltage AC110V/127V/220V/230V to 240V, adjustable Measurement output terminal : Speaker out : TP101(Mesuring for TUNER/DECK/CD) : Dummy load 6ohm Radio input signal AM modulation frequency : 400Hz Modulation factor : 30% FM modulation frequency : 400Hz Frequency displacement : 22.5kHz Standard measurement positions of volume and switch Power : Standby (Light STANDBY Indicator) Sub woofer VOL. : Minimum Sound mode : OFF Main VOL. : 0 Minimum Traverse 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 should 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 tracking. (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 volt- meter for two channels, therefore, the earth should be connected particularly. (7) In the case of BTL connection amplifier, the minus termi- nal 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. (No.MB207)1-31 4.3Arrangement of adjusting positions Cassette mechanism section (Mechanism A section)Cassette mechanism section (Back side) Cassette Mechanism Unit Section Head azimuth adjusting screw (Forward side) Head azimuth adjusting screw (Forward side) Head azimuth adjusting screw (Reverse side) Head azimuth adjusting screw (Reverse side) Playback head Playback, recording and eraser heads or playback head Front panel assembly Head amplifier & Mechanism control board VR301 Tape speed ADJ BIAS TP VR101 Bias ADJ L VR201 Bias ADJ R 1-32 (No.MB207) 4.4Tape recorder section 4.5Reference values for confirmation items Confirmation of head angle Confirmation of tape speed Test tape :VT712 (3kHz) or TMT7036 (3kHz) Measurement output terminal :Headphone terminal Adjust VR301 so that the frequency counter reading becomes 3,000Hz 60Hz when playing back the test tape VT712 (3kHz)with the playback mechanism or playback and recording mechanism after ending forward winding of the tape. Tape speed of decks (A and B) :3,000Hz 60Hz 1.Playback the test tape VT710 (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 either case,this adjustment should be performed in both the forward and reverse directions with the head azimuth screw. Test tape :VT710 (10kHz) Measurement output terminal :Speaker terminal Speaker R (Load resistor:6 ) :Headphone terminal Maximum output Adjust the head azimuth screw only when the head has been changed. VR301 ItemsMeasurement conditions Measurement method Standard values Adjusting positions Double tape speed Difference between the forward and reverse speed. P.mecha and R/P mecha speed Wow & flutter After setting to the double speed motor, confirm that the frequency counter reading becomes 4,800+400/-300Hz when the test tape VT712 (3kHz) has been play back with the playback mechanism. When the test tape VT712 (3kHz) has been played back with the playback mechanism or recording 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 VT712 (3kHz) has been played back with the playback mechanism or recording and playback mechanism at the beginning of forward winding the frequency counter reading of wow & flutter should be 0.25% or less(WRMS). 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 mechanism Measurement conditions Standard values Adjusting positions Items Measurement method Test tape :VT712 (3kHz) Measurement output terminal :Speaker terminal Speaker R (Load resistance:6 ) measurement output terminal :Headphone terminal Test tape :VT712 (3kHz) Measurement output terminal :Headphone terminal (No.MB207)1-33 4.6Electrical performance 4.7Reference values for electrical function confirmation items Adjustment of recording bias current (Reference value) Adjustment of recording and playback frequency characteristics Reference frequency :1kHz and 10kHz (REF:-20dB) Test tape :TYP AC-225 Measurement input terminal :OSC IN 1.With the recording and playback mechanism,load the test tape(AC-225 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 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 -1dB 2dB. Output deviation between 1kHz and 10kH :-1dB 2dB 1.With the recording and playback mechanism, load the test tapes(AC-225 to TYP ),and set the mechanism to the recording and pausing conditions in advance. 2.After connecting 100 in 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 become 4.0 A (TYP ). *Mode : Forward or reverse mode *Recording mode *Test tape : AC-225 Measurement output terminal :Both recording and headphone terminals AC-225 :4.20 A LcH :VR101 RcH :VR201 LcH :VR101 RcH :VR201 ItemsMeasurement conditions Measurement method Standard values Adjusting positions Items Measurement method Recording bias frequency Eraser current (Reference value) 1.While changing over to and from BIAS 1 and 2, confirm that the frequency is changed. 2.With the recording and playback mechanism. load the test tape (AC-225 to TYP ),and set the mechanism to the recording and pausing conditions in advance. 3.Confirm that the BIAS TP frequency on the P.C.board is 100kHz 6kHz. 1.With the recording and playback mechanism, load the test tapes(AC-225 to TYP ),and set the mechanism to the recording and pausing condition in advance. 2.After setting to the recording conditions,connect 1M in series to the eraser head on the recording and playback mechanism side,and measure the eraser current from both of the eraser terminal. 100kHz +9kHz -7kHz TYP :75mA Measurement conditions Standard values Adjusting positions *Recording and playback side forward or reverse *Test tape :TYP AC-225 *Measurement terminal BIAS TP on P.C.board *Recording and playback side forward or reverse *Recording mode *Test tape :AC-225 Measurement terminal Both of the eraser head 1-34 (No.MB207) SECTION 5 TROUBLESHOOTING This service manual does not describe TROUBLESHOOTING. (No.MB207)1-35 (No.MB207) AV & MULTIMEDIA COMPANY AUDIO/VIDEO SYSTEMS CATEGORY 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan VICTOR COMPANY OF JAPAN, LIMITED WPC Printed in Japan

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