JVC-MXK10-cs-sm维修电路原理图.pdf
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1、SERVICE MANUAL COMPACT COMPONENT SYSTEM No.21084 Oct. 2002 COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD. MX-K30/MX-K10 MX-K30/MX-K10 Contents Safety precautions Important for laser products Preventing static electricity Disassembly method Adjustment method Flow of functional operation until TOC read
2、Maintenance of laser pickup Replacement of laser pickup Description of major ICs 1-2 1-3 1-4 1-5 1-18 1-20 1-21 1-21 1-2228 Area Suffix JU.S.A. CCanada BASS-REFLEXBASS-REFLEX CD-R/RW PLAYBACK 3-CD PLAY TW2111A, Reverse ; TW2121A Fast Forward and Rewind ; TW2231A 9. Test disc : CTS-1000(12cm),GRG-121
3、1(8cm) 10. Jitter meter Measurement conditions Power supply voltage AC120V (60Hz) Measurement output terminal : Speaker out : TP101(Measuring for TUNER/DECK/CD) : Dummy load 6ohm Radio input signal AM modulation frequency : 400Hz Modulation factor : 30% FM modulation frequency : 400Hz Frequency disp
4、lacement : 22.5kHz Frequency Range AM531kHz1710kHz FM87.5MHz108MHz Standard measurement positions of volume and switch Power : Standby (Light STANDBY Indicator) 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 meas
5、urement 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
6、. 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 sys
7、tems with an electronic voltmeter for two channels, therefore, the earth should be connected particularly. 7. In the case of BTL connection amplifier, the minus 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
8、OTL system. VT703 : For Head azimuth(10kHz ) 1-19 Arrangement of adjusting positions Items Measurement conditions Measurement method Standard values Adjusting positions Tape recorder section Tuner section Cassette deck mechanism (Front side) Head azimuth screw (Forward side) PB Head (Deck-A) REC/PB
9、Head (Deck-B) Main P.C.B. TUNER P.C.B. Head azimuth screw (Reverse side) Head azimuth screw (Reverse side) Head azimuth screw (Forward side) 1.Playback the test tape VT703 (10KHz) or equivalent. 2.Adjust the head azimuth screw to obtain maximum output and both output of L / R is in 3dB. 3.Put on the
10、 screw lock paint after alignments. 1.Insert the recording tape in deck-B. 2.Starting the recording. 3.Adjust the oscillation frequency to 80KHz+/-3KHz by core of Oscillation coil of L301. Test tape : VT703 (10kHz) Measurement output terminal : Left and Right speaker output (6-ohm loaded) or Headpho
11、ne Output (32-ohm loaded) Test tape : TYPE AC-514 Measurement output terminal : Erase head terminal (CN308 8-Pin) Maximum output 80kHz+/-3kHz Adjust the head azimuth screw only when the head has been changed. Use the High- Impedance Probe for Frequency counter input. Cassette Head Azimuth Alignments
12、 Recording Bias Frequency Alignment Items Measurement conditions Measurement method Standard values Adjusting positions 1.Set the Signal Generator signal to 530KHz (529KHz) the feed to Loop Antenna. 2.Receiving the signal and the adjust the OSC coil (L2) obtain the V.T is 1.40V +/-0.05V. 3.Change th
13、e receiving frequency to 600KHz (603KHz). 4.Adjust the Antenna coil ( L2 ) obtain maximum sensitivity. (Adjust the SSG output to out of AGC range.) 1.Set the receiving frequency to 530KHz (529KHz ) 2.Feed the 450KHz signal to AM antenna input. 3.Adjust the IFT Block T1 obtain to maximum output. (Adj
14、ust the SSG output to out of AGC range.) Input signal : 530kHz (529kHz) 600kHz (603kHz) Adjustment point : Antenna coil (L2) Input signal : 530kHz (529kHz) Adjustment point : IFT (T1) V .T : 1.40V+/-0.05V Maximum sensitivity Maximum output Adjust the OSC coil only when the AM coil block has been cha
15、nged. Adjust the IFT only when the IFT block has been changed. AM Tracking Alignments AM IFT Alignments Note: The adjustment of CD section is not required. L301L301L301 8-Pin8-Pin8-Pin CN308CN308CN308 L2L2L2 T1T1T1 1-20 Flow of functional operation until TOC read Slider turns REST SW ON. Automatic t
16、uning of TE offset Laser ON Detection of disc Automatic measurement of Focus S-curve amplitude Automatic tuning of Focus offset Disc is rotated Focus servo ON (Tracking servo ON) Automatic tuning of Tracking error balance Automatic measurement of Tracking error amplitude Automatic tuning of Focus er
17、ror balance Disc to be braked to stop Tracking servo on states Tracking servo off states Disc states to rotate TOC reading finishes Automatic measurement of TE amplitude and automatic tuning of TE balance 500mv/div 2ms/divFig.1 Approx.3sec pin 20 of IC611(TE) Approx 1.8V VREF Tracking error waveform
18、 at TOC reading Power ON Play Key Confirm that the Focus error S-cuve signal at the pin32 of IC601 is approx.2Vp-p Confirm that the signal from pin24 IC601 is 0V as a accelerated pulse during approx.400ms. Confirm the waveform of the Tracking error signal. at the pin 20 of IC611 (R643) (See fig-1) A
19、utomatic tuning of Focus error gain Automatic tuning of Tracking error gain TOC reading Play a disc Confirm the eys-pattern at the lead of TP3 Confirm that the voltage at the pin5 of CN602 is HLH. Check Point Check that the voltage at the pin40 of IC601 is + 5V? 1-21 Turn off the power switch and,di
20、sconnect the power cord from the AC OUTLET. Replace the pickup with a normal one.(Refer to Pickup Removal on the previous page) Plug the power cord in,and turn the power on. At this time,check that the laser emits for about 3seconds and the objective lens moves up and down. Note: Do not observe the
21、laser beam directly. Play a disc. Check the eye-pattern at TP3. Finish. Maintenance of laser pickup (1) Cleaning the pick up lens Before you replace the pick up, please try to clean the lens with a alcohol soaked cotton swab. (2) Life of the laser diode When the life of the laser diode has expired,
22、the following symptoms will appear. 1. The level of RF output (EFM output:ampli tude of eye pattern) will below. Is the level of RFOUT under 1.25V 0.22Vp-p? Replace it. NO YES O.K (3) Semi-fixed resistor on the APC PC board The semi-fixed resistor on the APC printed circuit board which is attached t
23、o the pickup is used to adjust the laser power.Since this adjustment should be performed to match the characteristics of the whole optical block, do not touch the semi-fixed resistor. If the laser power is lower than the specified value,the laser diode is almost worn out, and the laser pickup should
24、 be replaced. If the semi-fixed resistor would be adjusted when the pickup operates normally,the laser pickup may be damaged due to excessive current. Replacement of laser pickup 1-22 AN22000A (IC611) : CD-DA Head Amp. 1. Terminal layout 3. Block diagram 2. Pin function Description of major ICs 1 16
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