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SERVICE MANUAL
COMPACT COMPONENT SYSTEM
RM-SMXJ111V REMOTE CONTROL
CLOCK
TIMER
ON SCREEN
1
2
3
-
+
SELECT
V.INTRO
SLEEP
4
5
6
ECHO
SET
HIGHLIGHT
7
8
9
PLAY MODE
10
+
10
CD1
CD2
CD3
STILL
C D
PREV
NEXT
RETURN SELECT
TAPE
REC PAUSE
A - TAPE - B
SHIFT
FM MODE
FM/AM
AUX
i
SOUND
KEY
MODE
VOLUME
CONTROL
I
SP-MXJ270V
Contents
MX-J270V
STANDBY
PLAY & EXCHANGER
NTSC/PAL COMPATIBILITY
VIDEO CD
1 BIT
DUAL D/A CONVERTER
MX-J270V
PHONES
MPX/V.REPLACE/V.MASKING
KEY CONTROL
REC
START/STOP
TAPE
-
PRESET
+
TUNING / VCD NUMBER
MIC LEVEL
DUBBING
-
PREV
NEXT
AUX
MIN
MAX
CD REC START
MIC
SOUND MODE
REVERSE MODE
TAPE A/B
PLAY
AUTO REVERSE
AUTO REVERSE
EJECT
EJECT
CA-MXJ270V
1-2
1-3
1-4
1-5
1-22
COPYRIGHT
2000 VICTOR COMPANY OF JAPAN, LTD.
CD
CD
CD
CD
CD
CD
VOLUME
+
-
ECHO
RANDOM
CD
SELECT
REPEAT
+
FM /AM
NTSC/PAL PAL AUTO
ACTIVE BASS EX.
REC/PLAY
SP-MXJ270V
until TOC read
MX-J270V
Area Suffix
US
Singapore
UX
Saudi Arabia
PlayBack
Control
VIDEO CD
1-26
1-27
1-27
1-28
No.20880
Nov. 2000
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Table of Contents
Related Manuals for JVC MX-J270V
Summary of Contents for JVC MX-J270V
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Page 1: Table Of Contents
MX-J270V SERVICE MANUAL COMPACT COMPONENT SYSTEM MX-J270V Area Suffix Singapore Saudi Arabia STANDBY PLAY & EXCHANGER VOLUME NTSC/PAL COMPATIBILITY VIDEO CD 1 BIT DUAL D/A CONVERTER – MX-J270V PHONES MPX/V.REPLACE/V.MASKING KEY CONTROL ECHO START/STOP RANDOM TAPE – PRESET TUNING / VCD NUMBER... -
Page 2: Safety Precautions
MX-J270V Safety Precautions 1. This design of this product contains special hardware and many circuits and components specially for safety purposes. For continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. -
Page 3: Important For Laser Products
MX-J270V Important for laser products 5.CAUTION : If safety switches malfunction, the laser is able 1.CLASS 1 LASER PRODUCT to function. 2.DANGER : Invisible laser radiation when open and inter 6.CAUTION : Use of controls, adjustments or performance of lock failed or defeated. Avoid direct exposure to beam. -
Page 4: Preventing Static Electricity
MX-J270V Preventing static electricity 1. Grounding to prevent damage by static electricity Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs. -
Page 5: Disassembly Method
MX-J270V Disassembly method Metal cover <Main body> Removing the metal cover (See Fig.1 to 3) Remove the six screws A attaching the metal cover on the back of the body. Remove the two screws B on both sides of the body. - Page 6 MX-J270V Removing the CD changer mechanism assembly (See Fig.4 to 7) Prior to performing the following procedures, remove the metal cover. CD changer Disconnect the card wire from connector CN308 and Main board mechanism assembly CN303 CN309 connecting the CD servo board and the main board.
- Page 7 MX-J270V Removing the front panel assembly CN306 CN307 CN305 CN301 (See Fig.8 to 11) CN302 Main board Prior to performing the following procedures, remove the metal cover and the CD changer mechanism assembly. Disconnect the card wires from connector CN302, CN306, CN307 and the harness from CN301, CN305 on the inside of the main board.
- Page 8 MX-J270V Removing the rear cover, the rear panel, Rear panel the voltage selector and the video board (See Fig.12 to 15) Prior to performing the following procedures, remove the metal cover and the CD changer mechanism assembly. It is not necessary to remove the front panel assembly.
- Page 9 MX-J270V Removing the main board Main board CN302 CN306 (See Fig.16 to 19) CN307 Prior to performing the following procedures, remove the metal cover, the CD changer mechanism CN301 assembly, the rear cover, the rear panel, the voltage selector and the video board.
- Page 10 MX-J270V Removing the power transformer CN901A,CN901B assembly (See Fig.20 to 22) Video board Prior to performing the following procedure, remove the metal cover, the CD changer mechanism assembly and the voltage selector. Disconnect the harness from connector CN901A and CN901B on the inside of the main board.
- Page 11 MX-J270V MIC/headphone board <Front panel assembly> Removing the MIC/headphone board Front panel assembly (See Fig.23 and 24) Prior to performing the following procedure, remove the metal cover, the CD changer mechanism assembly and the front panel assembly. Remove the two screws P attaching the MIC /headphone board.
- Page 12 MX-J270V Removing the display board and the Front panel assembly bracket (See Fig.27 and 28) Bracket Prior to performing the following procedure, remove the metal cover, the CD changer mechanism assembly and the front panel assembly. Disconnect the card wire from connector CN306 on the cassette amplifier board.
- Page 13 MX-J270V CD Traverse Mechanism Type:C3CN Section Removing the CD Servo control board (See Fig.1) Remove the Metal cover. Remove the CD Traverse mechanism assembly. From bottom side the CD Traverse mechanism assembly, remove the one screw A retaining the CD Servo control board.
- Page 14 MX-J270V Stopper Check whether the lifter unit stopper has been caught into the hole at the section "e" of CD tray assembly as shown in Fig.5. Make sure that the driver unit elevator is positioned as shown in Fig.6 from to the second or fifth hole on the left side face of the CD Traverse mechanism assembly.
- Page 15 MX-J270V Cams R1, R2 assembly Removing the CD mechanism assembly (See Fig.10) While turning the cams R1 and R2 assembly in the arrow direction "h", align the shaft "i" of the CD mechanism assembly to the position shown in Fig.10.
- Page 16 MX-J270V Removing the actuator motor board (See Fig.14, 15) Motor L Motor R Absorb the four soldered positions "q" of the right and left motors with a soldering absorber(See Fig.14). Remove the two screws G retaining the actuator motor board(See Fig.14).
- Page 17 MX-J270V Removing the actuator motor and belt Gear bracket (See Fig.19 to 22) Remove the two screws J retaining the gear bracket (See Fig.19). While pressing the pawl "u" fixing the gear bracket in the arrow direction, remove the gear bracket Pulley gear (See Fig.19).
- Page 18 MX-J270V Slit washer Removing the cams R1/R2 assembly and cam gear r (See Fig.23) Cam R2 Slit washer Remove the slit washer fixing the cams R1 and R2 assembly. Cam gear r By removing the two pawls "x" fixing the cam R1, separate R2 from R1.
- Page 19 MX-J270V < Cassette mechanism section > Cassette mechanism Removing the playback, recording and eraser heads (See Fig.1~3) 1. While shifting the trigger arms seen on the right side of the head mount in the arrow direction,turn Flywheel R the flywheel R in counterclockwise direction until the head mount has gone out with a click (See Fig.
- Page 20 MX-J270V Removing the head amp.and mechanism control P.C.board (See Fig. 4) 1.Remove the cassette mechanism assembly. Head amplifier & 2.After turning over the cassette mechanism mechanism control board assembly, remove the five screws "A" retaining the head amp. and mechanism control P.C.
- Page 21 MX-J270V Removing the capstan motor (See Fig. 8) Capstan motor From the joint bracket, remove the two screws "C" retaining the capstan motor. Joint bracket Removing the flywheel (See Fig. 9,10) 1.Remove the head amp. and mechanism control P.C.Board. 2.Remove the capstan motor assembly.
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Page 22: Adjustment Method
MX-J270V Adjustment method Tuner section Measuring devices necessary for Voltage input to the tuner ..... +B: DC 5.7 V adjustment VT: DC 12 V 1. Low-frequency oscillator Standard measuring output ..26.1 mV (0.28 V) /3ohm It must have the ability to output 600ohm from 0 dBs at an oscillation frequency of 20 Hz - 50 Hz. - Page 23 MX-J270V Arrangement of Adjusting Positions Cassette mechanism section (Mechanism A section) Cassette mechanism section (Back side) Head azimuth Head azimuth adjusting screw adjusting screw (Reverse side) (Forward side) Head azimuth Head azimuth Playback,recording and eraser adjusting screw adjusting screw Playback...
- Page 24 MX-J270V Tape Recorder Section Adjusting Items Measurement Standard Measurement method positions conditions values Confirmation Adjust the head Test tape Maximum 1.Playback the test tape VT703(10kHz). of head angle azimuth screw :VT703(10kHz) output 2.With the playback mechanism or recording & only when the...
- Page 25 MX-J270V Electrical Performance Adjusting Items Measurement Standard Measurement method positions conditions values Adjustment of AC-225 *Mode : Forward or 1.With the recording and playback mechanism, recording bias :4.20 A reverse mode load the test tapes(AC-514 to TYP and AC-225 to...
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Page 26: Flow Of Functional Operation
MX-J270V Flow of functional operation until TOC read Check Point Slider turns REST Power Key Power ON Check that the voltage at the pin 5 SW ON. of CN602 is 0V (a moment)? Automatic tuning of TE offset Check that the voltage at the... -
Page 27: Maintenance Of Laser Pickup
MX-J270V Maintenance of laser pickup Replacement of laser pickup (1) Cleaning the pick up lens Before you replace the pick up, please try to Turn off the power switch and,disconnect the clean the lens with a alcohol soaked cotton power cord from the ac outlet. -
Page 28: Description Of Major Ics
MX-J270V Description of major ICs AN8806SB (IC601) : RF&Servo AMP 1.Pin layout PDAC PDBD LDON PDER PDFR TBAL RF OUT FBAL RF IN C.AGC FE OUT C.ENV TE OUT C.EA CROSS CS BDO TE BPF VDET CS BRT LD OFF... - Page 29 MX-J270V 3. Pin function Pin No. Symbol Description APC amp input terminal APC amp output terminal LD ON APC ON/OFF control terminal Connect to ground Power supply Inverse input pin for RF amp RFamp output RF OUT RF IN RF input Connecting pin of AGC loop filter C.AGC...
- Page 30 MX-J270V BA15218F (IC852) : OP AMP. OUT1 -IN1 OUT2 +IN1 -IN2 +IN2 BA15218N (IC301,303,305,307) : Dual Ope. Amp. OUT1 +IN1 +IN1 GND +IN2 -IN2 OUT2 Vcc TA8409S (IC851,852) : Motor driver 1.Pin layout 2.Pin function INPUT OUTPUT MODE OUT1 OUT2...
- Page 31 MX-J270V BA6897FP (IC801) : 4channel driver D.BUF CH1-OUTA D.BUF CH1-OUTB CH4-OUTA D.BUF CH1-INA Level CH4-OUTB Level shift shift D.BUF CH1-INB CH4-INA T.S.D TEST1 CH4-INB TEST2 BIAS IN MUTE DRIVER CH3-INB CH2-INB MUTE CH2-INA CH3-INA Level Level D.BUF D.BUF shift shift...
- Page 32 MX-J270V BH3854 (IC306) : E.Volume 1.Terminal layout 2.Block diagram BASS (TREBLE) TONE CONTROL 3.8V CONTROL TONE CONTROL BASS (TREBLE) 200K Volume, bass treble and surround can be also controlled externally by giving DC voltage through VC (volume control) terminal, BC (bass control) terminal, TC (treble control) terminal and SC (surround control) terminal.
- Page 33 MX-J270V 3. Pin function BH3854 PIN Name Function PIN Name Function A-GND Analog system ground VREF Terminal for 3.8V reference voltage output Terminal for 1ch volume LATCH Terminal to receive latch data input Terminal for gain adjustment DATA Terminal to receive data...
- Page 34 MX-J270V BU2173F (IC105) : VCO 1.Terminal Layout 2.Block diagrams AVDD TSTO FPUT4 XTALI VDDIO XTALO FOUT1 CTRLA TEST CTRLB FOUT2 CTRLC VSSIO TSTI FOUT3 AVSS 3.Pin function Symbol Function Pin No. Digital VDD. TSTO Use open this pin for normal operation.
- Page 35 MX-J270V CL480-F1 (IC101) : MPEG-1 Audio / Video decoder Symbol Symbol Pin No. Pin No. Function Function Video data terminal (G24/Y24) Host address. VD10 12 78 80 Power supply for Input/Output. Data strobe terminal. IOVDD Video data terminal (G57/Y57) I/O read terminal.
- Page 36 MX-J270V HD74HCT244 (IC113) : Buffer 1. Terminal layout 2. Block diagram 1-36...
- Page 37 MX-J270V LC72136 (IC2) : PLL Frequency Synthesizer 1. Pin layout FM/AM LPFIN LPFOUT CLOCK FM/ST/VCO FMIN AM/FM AMIN IFCONT SDIN IFIN 2. Block diagram Phase Reference Detector Driver Charge Pump Swallow Counter Swallow Counter 1/16,1/17 4bit 1/16,1/17 4bit Unlock Detector...
- Page 38 MX-J270V LH531HEG (IC102) : 1M ROM 2.Block diagram 1.Terminal Layout MEMORY MATRIX (131,072 8bit) CORAM SELECTOR SENS AMP. TIMING BUFFER GENERATOR BUFFER BUFFER OUTPUT 13 14 15 17 18 19 20 21 D0 D1 D2 D3 D4 D5 D6 D7 3.Pin Function...
- Page 39 MX-J270V MN171601AK8J2 (IC111) : HOST Micro Computer 1.Terminal Layout 2.Pin Function Symbol Pin No. Function Reset signal output. 480RST Input the transfer request data signal. MREQ Interact 2 signal input. ACTINT CD-G detect terminal H:CD-G GDET Connected to GND. Acknowledge signal input.
- Page 40 MX-J270V MN35510 (IC651) : Digital servo & digital signal processor 1. Terminal Layout 20 ~ 41 ~ 2.Block Diagram LRCKIN(MSEL) AVSS1 8TIMES BCLK(SSEL) AVDD1 DIGITAL OVER SAMPUNC SRDATAIN OUTR DEEMPHSIS DIGITAL FILTER 1BIT (PSEL) LOGIC IOSEL CLVS BLKCK OUTL CLDCK...
- Page 41 MX-J270V 3. Description symbol I/O Description symbol I/O Description Tracking error shunt signal output(H:shunt) BCLK Not used LRCK Not used PLAY Not used SRDATA WVEL Not used Not used DVDD1 Power supply (Digital) RF signal input DVSS1 Connected to GND...
- Page 42 MX-J270V TA2057N (IC1) : FM/AM IF AMP & Detector 1.Block Diagrams IF IN Vstb IF IN QUAD FM OUT AM OUT MPX IN LPF 1 LPF 2 L OUT DIVIDE MUTE DECODE LEVEL AM/FM MONO BUFF IF REQ BUFF IF OUT...
- Page 43 MX-J270V TC9409BF (IC601) : KARAOKE DSP 1-43...
- Page 44 MX-J270V TDA7295 (IC101, IC201) : Audio AMP 1. Pin arrangement chart -Vp (POWER) +Vp (POWER) N.C. N.C. MUTE STAND-BY -Vs (SIGNAL) +Vs (SAIGNAL) BOOTSTRAP N.C. NON INVERTING INPUT INVERTING INPUT STAND-BY GND 2. Block diagram BOOTSTRAP BOOTSTRAP OUTPUT BIPOLAR SHORT CIRCUIT MOS GAIN &...
- Page 45 MX-J270V VICTOR COMPANY OF JAPAN, LIMITED AUDIO & COMMUNICATION BUSINESS DIVISION PERSONAL & MOBILE NETWORK BUSINESS UNIT 10-1,1Chome,Ohwatari-machi,Maebashi-city,371-8543,Japan Printed in Japan No.20880 200011(V)
- Page 46 MX-J270V Block diagram FW852 FW851 CN305 CN301 JA303 CN701 CN702 CN304 CN303 CN311 CN309 CN651 CN306 CN312 CN601 CN602 CN700 DSP BOARD CN101 CN102 VIDEO CD BOARD CN103...
- Page 47 MX-J270V Standard schematic diagrams Power supply section Version:U/UX/US AC 110V / 127V / 220V / 230-240V 50Hz/60Hz SHEET 2/8 FW999 F999 Mains T 1.6A Plug F998 T 1.25A S2/S3 F997 T 1.25A S999 VOLT.-SEL Th-Fuse T999 TRANSFORMER F996 T 800mA...
- Page 48 MX-J270V Main section SHEET 7/8 SHEET 7/8 TO DSP PCB TO DSP PCB CN304 CN303 D317 D319 C325 1SS133 TP-GND R327 RELAY TP-L 120K 1SS133 IC101 TDA7295 50V0.47 RY901 R118 C119 0.12-M R130 R101 C104 25V10 D101 L-CH C118 470P...
- Page 49 MX-J270V Control section FL701 QLF0021-001 CONTROL PCB L702 47uH L701 47uH JS701 R,D,S A.BASS EX S.MODE QSW0538-001 CONT. RANDOM DISC1 L706 10uH NEWS INFO PRGM CLOCK SLEEP MONO S700 R765 EJECT1 D706 -35V 1SS133 S701 SDATA D707 C735 16V47 DISC2...
- Page 50 MX-J270V Cassette amplifier & Mechanism control section SHEET 3/8 SHEET 2/8 TAPE P.B. signal Note VDH1033-003PV SHEET 4/8...
- Page 51 MX-J270V CD Servo & CD Mechanism control section CD/AUDIO signal VIDEO/CD signal SHEET 5/8...
- Page 52 MX-J270V Video CD section 3.3V C142 IC102 LH531HEG R115 R116 VCLK MD14 MD15 MD15 MD10 MD12 MD11 ERROR CDLRC CDDAT CDBCK DALRC3 DADAT3 DABCK3 XCLK IC101 CL48D-F1 C106 VD23 VD11 SBSY VD12 VD13 SFSY N/PAL IC104 BU1424K VCDEMP3 C105 MD15...
- Page 53 MX-J270V DSP section D603 1SS133 R618 2.2K SDATA D602 1SS133 R619 2.2K R620 2.2K DSPSTB R617 2.2K DSPRESET C633 560P C632 C603 50V1 R601 LRCKI VDA1 C604 BCKI MICI R604 0.0047-M R605 LPFO1 C608 50V1 LRCKO VAR1 R607 C629 6.3V220...
- Page 54 MX-J270V MIC / headphone section IC852 BA15218F R852 4.7K R854 3.9K J851 R855 +B 9V GNS007-002 R858 2.2K J850 L852 47uH L851 47uH VMJ4026-001 FW851 FW-4P-L300 MIC signal SHEET 2/8 SHEET 8/8...
- Page 55 MX-J270V Vol. sel. board Power transf. board Printed circuit boards Main, DSP, video and power board Main board Video board DSP board 2-10...
- Page 56 MX-J270V Display, Multi-control & switch board Display board Power switch board Multi-control board Volume board 2-11...
- Page 57 MX-J270V Cassette mechanism amplifier board MIC / headphone board 2-12...
- Page 58 MX-J270V CD Servo control board 2-13...
- Page 59 MX-J270V Video CD board 2-14...
- Page 60 MX-J270V CD Tray section switch board Cam switch board 2-15...
- Page 61 MX-J270V -MEMO- 2-16...