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JVC UX-A7DVD Service Manual

Micro component system
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Download this manual See also: Instruction Manual
SERVICE MANUAL
MICRO COMPONENT SYSTEM
2003
03
22013
STANDBY/ON
1
2
3
DISPLAY
4
5
6
CLOCK/TIMER
7
8
9
AP
SLEEP
OFF
10
0
+10
PLAY MODE
REV. MODE
DVD
COLOR
ON SCREEN
ZOOM
DIGEST
LEVEL
DIMMER
AUDIO
SUB TITLE
ANGLE
TOP MENU
MENU CHOICE
EN TER
SET
CANCEL
DVD
TAPE
FM/AM
AUX/MD
SELECT
STROBE
RETURN
PREV.
NEXT
GROUP SKIP
SLOW
Ð
SLOW
+
KEY
DIGITAL
CONTROL
ECHO
3D PHONIC
AHB PRO
KEY
FADE
BASS/
CONTROL
FM MODE
MUTING
TREBLE
SHI FT
VO LUM E
RM-SUXA7DVDU REMOTE CONTROL
1
Important Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
2
Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
3
Adjustment method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-34
4
Description of major ICs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-41
UX-A7DVD
D
V
D
/
M U L T I
REV.MOD E
DVD
TAPE
A
U
D I G I T A L
3 ¥ W A Y
S P E A K E R
S Y S T E M
COMPACT
SUPER VIDEO
D I G I T A L
TABLE OF CONTENTS
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD.
COMPACT
S
U
P
E
R
V
C
D
/
V
C
D
/
C
D
SUPER VIDEO
C O L O R
D I S P L A Y
AUX/MD
TREBLE
FM/AM
BASS
T
O
R
E
V
E
R
S
E
U X - A 7 D V D
3 ¥ W A Y
S P E A K E R
US ------------------- Singapore
UN ------------------------ Asean
S Y S T E M
Area suffix
UX-A7DVD
No.22013
2003/03

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Summary of Contents for JVC UX-A7DVD

  • Page 1 UX-A7DVD SERVICE MANUAL MICRO COMPONENT SYSTEM 22013 2003 UX-A7DVD COMPACT SUPER VIDEO M U L T I C O L O R D I S P L A Y STANDBY/ON DISPLAY CLOCK/TIMER SLEEP REV.MOD E AUX/MD TREBLE PLAY MODE REV. MODE...

  • Page 2: Important Safety Precautions

    UX-A7DVD SECTION 1 Important Safety Precautions 1.1 Safety Precautions (1) This design of this product contains special hardware and exposed metal part and a known good earth ground. many circuits and components specially for safety purposes. Measure the AC voltage across the resistor with the AC For continued protection, no changes should be made to the voltmeter.
  • Page 3 UX-A7DVD 1.5 Preventing 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 4 UX-A7DVD 1.8 Important for laser products (1) CLASS 1 LASER PRODUCT (5) CAUTION : If safety switches malfunction, the laser is able (2) DANGER : Invisible laser radiation when open and inter to function. lock failed or defeated. Avoid direct exposure to beam.

  • Page 5: Disassembly Method

    UX-A7DVD SECTION 2 Disassembly method 2.1 Main body 2.1.1 Removing the metal cover Metal cover (See Fig.1~3) (1) Remove the six screws A on the back of the body. (2) Remove the screw B on each side of the body.
  • Page 6 UX-A7DVD 2.1.2 Removing the DVD mechanism assembly (See Fig.4, 5) • Prior to performing the following procedure, remove the metal cover. DVD mechanism assembly (1) Remove the three screws C attaching the DVD mecha- nism assembly on top of the body.
  • Page 7 UX-A7DVD 2.1.3 Removing the front panel assembly (See Fig.6~9) • Prior to performing the following procedure, remove the metal Front panel assembly Main board cover and the DVD mechanism assembly. CN710 (1) Disconnect the card wire from connector CN705 on the mi- crocomputer board in the center of the right side of the body.
  • Page 8 UX-A7DVD 2.1.4 Removing the rear cover / rear panel (See Fig.10~14) • Prior to performing the following procedure, remove the metal cover and the DVD mechanism assembly. Rear cover (1) Remove the two screws F on the back of the body.
  • Page 9 UX-A7DVD 2.1.5 Removing the tuner pack (See Fig.15) • Prior to performing the following procedure, remove the metal cover. Tuner pack (1) Disconnect the card wire from connector CN1 on the tuner pack on the right side of the body.
  • Page 10 UX-A7DVD 2.1.7 Removing the headphone board (See Fig.18, 19) • Prior to performing the following procedure, remove the metal cover, the DVD mechanism assembly and the front panel as- Headphone board sembly. (1) Disconnect the wire from connector CN310 on the main board on the left side of the body.
  • Page 11 UX-A7DVD 2.1.8 Removing the main board (See Fig.20, 21) • Prior to performing the following procedure, remove the metal cover, the DVD mechanism assembly, the front panel assem- Main board bly and the rear cover/ rear panel. CN303 CN304 CN305 (1) Remove the two screws M and the three screws N, and then remove the heat sink.
  • Page 12 UX-A7DVD 2.1.10 Removing the base chassis / microcomputer board (See Fig.23~25) • Prior to performing the following procedure, remove the metal cover, the DVD mechanism assembly, the front panel assem- Base chassis bly, the rear cover/ rear panel, the main board and the DVD re- lay board.
  • Page 13 UX-A7DVD 2.1.11 Removing the power transformer assembly (See Fig.26, 27) • rior to performing the following procedure, remove the metal cover, the DVD mechanism assembly, the front panel assem- Power transformer board bly, the rear cover/ rear panel, the main board and the base...
  • Page 14 UX-A7DVD 2.1.12 Removiing the power amplifier board (See Fig.28, 29) • Prior to performing the following procedure, remove the metal cover, the DVD mechanism assembly, the front panel assem- bly, the rear cover/ rear panel, the main board and the base chassis.
  • Page 15 UX-A7DVD 2.2 Front panel assembly • Prior to performing the following procedure, remove the metal cover, the DVD mechanism assembly and the front panel as- sembly. 2.2.1 Removing the cassette mechanism assembly (See Fig.30, 31) (1) Remove the spring attached to the cassette door on the back of the front panel.
  • Page 16 UX-A7DVD 2.2.2 Removing the key board (See Fig.32~34) • Prior to performing the following procedure, remove the cas- Key board sette mechanism assembly. (1) Pull out the volume knob on the front side of the front panel. (2) Remove the five screws W attaching the bracket (1) on the back of the front panel.
  • Page 17 UX-A7DVD 2.2.3 Removing the MIC board (See Fig.35, 36) • Prior to performing following procedure, remove the cassette mechanism assembly (1) Remove the screw Y attaching the MIC board. (2) Pull out the mic volume knob on the front side of the front panel.

  • Page 18: See Fig.

    UX-A7DVD 2.2.4 Removing the FL connection board (See Fig.37~39) (1) Remove the two screws Z and the screw AA attaching the Front panel bracket (2) on the back of the front panel. FL connection board (2) Disconnect the card wire from connector CN441 on the FL CN441 connection board.

  • Page 19: See Fig.

    UX-A7DVD 2.2.5 Removing the drive motor assembly (See Fig.37,38,40) (1) Remove the two screws Z and the screw AA attaching the bracket (2) on the back of the front panel. (2) Remove the screw AB attaching the drive motor assem- bly.

  • Page 20: No.22013)1

    UX-A7DVD 2.2.8 Removing the FL display section (See Fig.43~48) (1) Remove the four screws AE attaching the case cover on the front panel. FL relay board CN452 (2) Pull out the FL panel from the four joint bosses m on the FL CN451 display cover.
  • Page 21 UX-A7DVD 2.2.9 Removing the FL relay board (See Fig.49) • Prior to performing the following procedure, remove the FL dis- play cover. (1) Disconnect the card wire from connector CN453 on the FL relay board. (2) Remove the two screws AH attaching the FL relay board.
  • Page 22 UX-A7DVD 2.3 DVD loading mechanism section 2.3.1 Removing the clamper assembly (See Fig.1) (1) Remove the four screws A attaching the clamper assem- bly. (2) Move the clamper assembly in the direction of the arrow to release the joint a on each side, and remove.
  • Page 23 UX-A7DVD 2.3.3 Removing the servo control board (See Fig.4) CAUTION: Solder the sorting round point before disconnecting the flexible Sorting round point wire extending from the pickup. If you do not follow this instruc- tion, the pickup may be damaged.
  • Page 24 UX-A7DVD 2.3.5 Removing the elevator (See Fig.7,8) • Prior to performing the following procedure, remove the clamper assembly, the tray, the servo control board and the Elevator traverse mechanism assembly. (1) Pull the two tabs g outward and release the two shafts of the elevator.
  • Page 25 UX-A7DVD 2.3.6 Removing the motor assembly (See Fig.9, 10) • Prior to performing the following procedure, remove the clamper assembly, the tray, the servo control board, the traverse mechanism assembly and the elevator. Belt (1) Remove the belt from the pulley.
  • Page 26 UX-A7DVD 2.3.7 Removing the idle gear/ pulley gear/ middle gear/ slide cam (See Fig.11~13) • Prior to performing the following the procedures, remove the clamper assembly, the tray, the servo control board, the traverse mechanism assembly, the elevator and the motor as- sembly.
  • Page 27 UX-A7DVD 2.4 DVD traverse mechanism assembly 2.4.1 Removing the feed motor assembly (See Fig.14) (1) Unsolder the two soldering l on the spindle motor board. (2) Remove the two screws F attaching the feed motor assem- Feed motor assembly bly.
  • Page 28 UX-A7DVD 2.4.3 Removing the pickup (See Fig.17~19) • Prior to performing the following procedure, remove the feed motor assembly. Pickup Spindle base (1) Remove the screw l, the T spring(S) and the shaft holder with the plate. ATTENTION: When reassembling, reattach the T spring (s) correctly to...
  • Page 29 UX-A7DVD 2.4.4 Removing the shaft holder/ shaft (See Fig.20) • Prior to performing the following procedure, remove the feed Shaft motor assembly and the pickup. (1) Remove the screw K attaching the shaft holder. Shaft holder (2) Remove the shaft.
  • Page 30 UX-A7DVD 2.5 Cassette mechanism assembly section Cassette mechanism assembly Fly wheelR 2.5.1 Removing the Play/Record & Clear head (See Fig.1~3) (1) While moving the trigger arm on the right side of the head mount in the direction of the arrow, turn the flywheel R counterclockwise until the head mount comes ahead and clicks.
  • Page 31 UX-A7DVD 2.5.2 Removing the head amplifier & mechanism control board (See Fig.4) (1) Turn over the cassette mechanism assembly and remove the three screws A attaching the head amplifier & mecha- Head amplifier & mecha control board nism control board.
  • Page 32 UX-A7DVD 2.5.4 Removing the flywheel (See Fig.8, 9) • Prior to performing the following procedure, remove the head amplifier & mechanism control board and the main motor as- sembly. (1) From the front side of the cassette mechanism, remove the slit washers attaching the capstan shaft L and R.
  • Page 33 UX-A7DVD 2.5.6 Reattaching the Play/ Record & Clear head (See Fig.11~13) (1) Reattaching the head mount assembly. a) Change front of the direction cover of the head mount assembly to the left (Turn the head forward). b) Fit the bosses O',P',Q',U' and V' on the head mount assembly to the holes P and V, the slots O,U and Q of the mecha sub assembly (See Fig.11 to 13).

  • Page 34: Adjustment Method

    UX-A7DVD SECTION 3 Adjustment method 3.1 Method of setting DVD test mode 1.Main body "Stop button " and "DVD eject button " are pushed at the same time, and the power supply is turned on. 2.The display of the FL display becomes "TEST D", and becomes a test mode.
  • Page 35 UX-A7DVD • Value of current of laser FL display(Example) Remote control "4" button Value of current of laser for CD 0033 0000 Remote control "5" button Value of current of laser for DVD Value of current of laser As for the value of the current of the laser, the figure displayed on the FL display reaches the current value as it is by the unit of mA.
  • Page 36 UX-A7DVD (4) Display of number of ROM When MENU and the TOP MENU key are pushed in the test mode, the number of ROM of the main microcomputer, a sub- microcomputer, the unit microcomputer, and microcode is displayed on the FL display instead of the test display.
  • Page 37 UX-A7DVD 3.2 Cassette mechanism section Head angle Head angle azimuth screw azimuth screw (foward) (reverse) CN31 Head angle Head angle Recording and play head/Erase head azimuth screw azimuth screw (foward) (reverse) Mechanism control P.C. board B102 R371 C376 Q375 CN32...
  • Page 38 UX-A7DVD 3.2.1 Mechanism section Item Confirmation of angle of head Tape speed confirmation Mesurement Test tape: VT703L (8kHz) Test tape: VT712 (3kHz) condition Measurement output terminal: Measurement output terminal: Speaker terminal Speaker terminal or headphone terminal Mesurement 1.Test tape VT703L (8kHz) is played.
  • Page 39 UX-A7DVD 3.2.3 Electric adjustment Recording reproduction Item Recording BIAS adjustment frequency characteristic Mesurement Forward or reverse Standard frequency: 1kHz/10kHz condition Test tape: AC-514 TYPE (Srandard: -20dB) AC-225 TYPE Test tape: AC-514 TYPE Measurement output terminal: Measurement input terminal: OSC IN...
  • Page 40 UX-A7DVD 3.3 Maintenance of DVD pickup 3.4 Procedures of changing the DVD pickup (1) Cleaning of pickup lens The power switch is turned off, a) Prior to changing the pickup, clean the pickup lens. and the power code is pulled out from the outlet.

  • Page 41: Description Of Major Ics

    UX-A7DVD SECTION 4 Description of major ICs 4.1 74VHC00MTC-X (IC455,IC503) : NAND Gate • Pin layout • Truth table V cc L : High impedance 4.2 74VHC74MTC-X (IC454) : Flip-Flop with Preset and Clenar • Terminal layout • Trouth table...
  • Page 42 UX-A7DVD 4.3 AN8703FH-V (IC101) : Frontend processor • Pin layout • Block diagram 45 44 29 27 56 36 36 28 55 26 61 Level Level Cont. Cont. DTRD AGOFST IDGT AGCBAL OFTR STANBY Det. Det. DFLTOP AGCLVL DCFLT Vol. Adg...
  • Page 43 UX-A7DVD • Pin function Pin No. Symbol Function Pin No. Symbol Function AGCG AGC amplifier again control LPC1 Laser pin input (DVD head) AGCO AGC amplifier level control LPCO1 Laser drive output (DVD head) TESTSG TEST signal input LPC2 Laser in input (CD head)
  • Page 44 UX-A7DVD 4.4 AK93C65AF-X (IC451) : EEPROM • Pin layout • Block diagram 45 44 29 27 56 36 36 28 55 26 61 Level Level Cont. Cont. DTRD AGOFST IDGT AGCBAL OFTR Det. Det. STANBY DFLTOP AGCLVL DCFLT Vol. Adg...
  • Page 45 UX-A7DVD 4.5 BA5983FM-X (IC201) : BTL driver • Pin layout & Block diagram STAND BY C #4 Level Sblft Level Sblft Level Sblft Level Sblft STAND BY C #1/2/3 • Pin function Pin No Symbol Function BIAS IN OPIN1(+) Output3 for motor...
  • Page 46 UX-A7DVD 4.6 BA6664FM-X (IC251) : Motor driver • Pin layout & Block diagram VM GSW VCC GAIN SWITCH SHORT BRAKE BRAKE MODE Hall Bias TORQUE SENSE AMP CURRENT SENSE AMP DRIVER R Q Q D CK GAIN CONTROL HALL AMP...
  • Page 47 UX-A7DVD 4.7 CS5960AT-X (IC571) : MPEG/Audio clock generator with VCXO • Pin layout XOUT 27 MHz VCXO 13.5 MHz 16.93421053 MHz • Block diagram 27MHz OUTPUT 27XIN 18.33421053 MHz(-3) DIVIDERS 7bit XOUT 7bit 11bit VCXC 8bit 13.5MHz 4.8 GP1FA550TZ (IC392) : Fiber-optic transmitter unit •...
  • Page 48 UX-A7DVD 4.9 HA12238F (IC32) : R/P Equalizer • Pin layout TEST PB-NF1(L) (Open for nomal use) TEST 2 Iraf MUTE PBIN(l) ALC DET Return SW REC Return REC MUTE OFF/ON Return SW PBIN(R) MUTO ON/OFF REC RETURN ON/OFF MUTE TEST 3...
  • Page 49 UX-A7DVD • Pin function Pin No. Symbol Function PB-NF2(R) PB EQ feed back PB-EQ(R) NAB output EQOUT(R) EQ output TAI(R) Tape input PBOUT(R) PB output NC pin REC IN(R) REC-EQ input ALC(R) ALC(R) signal out put NC pin REC OUT(R)
  • Page 50 UX-A7DVD 4.10 GP1UM261XK (IC861) : Receiver • Pin layout Vout • Block diagram Limiter B.P.F. Integrator Demodulator Comparator GND Vdd Vout 1-50 (No.22013)
  • Page 51 UX-A7DVD 4.11 K4S641632F-TC75 (IC504) :CMOS SDRAM • Pin layout 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 18 19 20 21 22 23 24 25 26 27 •...
  • Page 52 UX-A7DVD 4.12 LA73054-X (IC601) : Video driver • Pin layout & Block diagram DRIVER DRIVER DRIVER DRIVER DRIVER DRIVER LPF2 LPF1 2Step Amp1 LPF2 LPF1 LPF2 LPF1 2Step Amp4 LPF1 SYNC C_OFFSET DC_CTL LPF1 2Step 2Step 2Step Amp5 Amp6 PEDESTAL...
  • Page 53 UX-A7DVD 4.13 L4909 (IC212) : Regulator • Pin layout 9 10 11 12 13 14 15 • Block diagram VINA THERMAL REFERENCE VINB 3,13 REF+20% SHUTDOWN GENERATOR REG1 REG1 ENABLE REG2 CONTROL REG3 REG2 OVER CURRENT CHECK TRIG REG3 • Pin functions Pin No.
  • Page 54 UX-A7DVD 4.14 LC75345M-X (IC311) : E.volume • Pin layout 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 • Block diagram LINP LINM LVref LOPOUT CONTROL CIRCUIT LOGIC Vref INTERFACE CIRCUIT...
  • Page 55 UX-A7DVD • Pin function Pin No. Symbol Function Serial data and clock input pin for control. Chip enable pin. Ground pin. LOPOUT Output pin of general-purpose operation amplifier. LINM Non-inverted input pin of general-purpuse operation amplifier. LINP Non-inverted input pin of general-purpuse operation amplifier.
  • Page 56 UX-A7DVD 4.15 LB1641 (IC741) : DC Motor driver • Pin layout • Pin function Input Output Mode OUT1 OUT2 Brake CLOCKWISE COUNTER-CLOCKWISE GND OUT1 P1 IN2 VCC1 VCC2 P2 OUT2 Brake 4.16NJM4580M-X (IC211) : Ope. amp • Block diagram A OUT...
  • Page 57 UX-A7DVD 4.17 MN35505-X (IC202) : DAC • Terminal layout • Pin function Pin No. Symbol Function Control signal for DAC Digital data input LRCK L and R clock for DAC Bit clock for DAC Control signal for DAC DVDD2 Power supply...
  • Page 58 UX-A7DVD 4.18 MR27V1602EGSTPX (IC402) : P2ROM • Pin layout 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 10 11 12 13 14 15 16 17 18 19 20 21 22 •...
  • Page 59 UX-A7DVD 4.19 SAA6588T/V2-X (IC751) : RDS/RBDS pre-processor • Pin layout • Block diagram VDDD SCOUT 57 kHz DAVN CLOCKED RDS/RDBS RDS/RDBS 8th ORDER COMPARATOR DEMODULATOR DECODER BAND-PASS PSWN MPTH PAUSE SIGNAL QUALITY MULTI-PATH INTERFACE AFIN DETECTOR DETECTOR DETECTOR REGISTER LVIN...
  • Page 60 UX-A7DVD 4.20 ZIVA-4.1-PB0 (IC501) : AV decoder • Pin layout • Pin function Pin No. Symbol Description Read strobe input Read/write strobe input VDD_3.3 Power supply terminal 3.3V WAIT Transfer not complete / data acknowledge. Active LOW to indicate host initiated transfer is complete.
  • Page 61 UX-A7DVD Pin No. Symbol Description Non connect Non connect Non connect VDD_2.5 Power supply terminal 2.5V Connect to ground Non connect Non connect Non connect Non connect Non connect PIO0 I/O Programmable I/O terminal Connect to ground VDD_3.3 Power supply terminal 3.3V...
  • Page 62 UX-A7DVD Pin No. Symbol Description CLKSEL Selects SYSCLK or VCLK as clock source. Normal operation is to tie HIGH. MADDR9 SDRAM address MADDR8 SDRAM address VDD_3.3 Power supply terminal 3.3V Connect to ground MADDR7 SDRAM address MADDR6 SDRAM address MADDR5 SDRAM address VDD_2.5...
  • Page 63 UX-A7DVD Pin No. Symbol Description DA-XCK I/O Audio external frequency clock input or output DA-BCK PCM bit clock output DA-IEC PCM data out in IEC-958 format or compressed data out in IEC-1937 format VDD_2.5 Power supply terminal 2.5V Connect to ground...
  • Page 64 UX-A7DVD Pin No. Symbol Description DVD-DATA5/CDG-VFSY DVD parallel compressed data from DVD DSP. or CD-G frame sync indicating frame-start or composite synchronization input. DVD-DATA6/CDG-SOS1 DVD parallel compressed data from DVD DSP. or CD-G block sync indicating block-start synchronization input DVD-DATA7/CDG-SCLK DVD parallel compressed data from DVD DSP.
  • Page 65 UX-A7DVD 4.21STK402-050 (IC111) : 2ch AF power amp. • Pin layout • Block diagram TR1E TR12 TR10 TR13 TR16 (No.22013)1-65...
  • Page 66 UX-A7DVD VICTOR COMPANY OF JAPAN, LIMITED AV & MULTIMEDIA COMPANY 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan (No.22013) Printed in Japan 200303WPC...