JVC MXDVA-5-UW Service manual

SERVICE MANUAL

COMPACT COMPONENT SYSTEM

MX-DVA5

UG US UW UY

ANDBY

STANDBY/ON

SP-MXDVA5

PHONES

SELECT

CLOCK

DISPLAY

TIMER

REPEAT

CA-MXDVA5

REC START

/STOPCDREC START

(No MIC jack and MIC LEVEL volume for UY ver. )

DISC CHANGE

SOUND

MODE

SUBWOOFER

LEVEL

TUNING

TAPE B

TAPE A

DUBBING

SP-MXDVA5

Area Suffix

Turkey, South Africa, Egypt

Singapore

Brazil, Mexico, Peru

Argentina

PlayBack

Control

CD/ DVD Mechanism is exchanged by a unit (contain CPC cords).

Contents

Safety Precautions Important for laser products Preventing static electricity Disassembly method Wiring connection

1-2 1-3 1-4 1-5 1-17

Adjustment method Troubleshooting Descr

iption of major ICs

VIDEO CD

1-18 1-22 1-25~ 35

No.20966

Jun. 2001

MX-DVA5

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. Replacement parts must be identical to those used in the original circuits. Services should be performed by qualified personnel only.

2. Alterations of the design or circuitry of the product should not be made. Any design alterations of the product should not be made. Any design alterations or additions will void the manufacturer`s warranty and will fur ther relieve the manufacture of responsibility for personal injury or property damage resulting therefrom.

3. Many electrical and mechanical parts in the products have special safety-related characteristics. These

characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in the Parts List of Service Manual. Electrical components having such features are identified by shading on the schematics and by ( ) on the Parts List in the Service Manual. The use of a substitute replacement which does not have the same safety characteristics as the recommended replacement parts shown in the Parts List of Service Manual may create shock, fire, or other hazards.

4. The leads in the products are routed and dressed with ties, clamps, tubings, barriers and the like to be separated from live parts, high temperature parts, moving parts and/or sharp edges for the prevention of electric shock and fire hazard. When service is required, the original lead routing and dress should be observed, and it should be confirmed that they have been returned to normal, after re-assembling.

5. Leakage currnet check (Electrical shock hazard testing) After re-assembling the product, always perfor m an isolation check on the exposed metal parts of the product (antenna terminals, knobs, metal cabinet, screw heads, headphone jack, control shafts, etc.) to be sure the product is safe to operate without danger of electrical shock. Do not use a line isolation transformer during this check.

Plug the AC line cord directly into the AC outlet. Using a "Leakage Current Tester", measure the leakage current from each exposed metal parts of the cabinet, particularly any exposed metal part having a return path to the chassis, to a known good earth ground. Any leakage current must not exceed 0.5mA AC (r.m.s.).

Alternate check method Plug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 ohms per volt or more sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by a 0.15 F AC-type capacitor between an exposed metal part and a known good earth ground. Measure the AC voltage across the resistor with the AC voltmeter. Move the resistor connection to each exposed metal part, particularly any exposed metal part having a return path to the chassis, and meausre the AC voltage across the resistor. Now, reverse the plug in the AC outlet and repeat each measurement. Voltage measured any must not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.).

0.15 F AC TYPE

1500 10W

Good earth ground

AC VOLTMETER (Having 1000 ohms/volts, or more sensitivity)

Place this probe on each exposed metal part.

1. This equipment has been designed and manufactured to meet international safety standards.

2. It is the legal responsibility of the repairer to ensure that these safety standards are maintained.

3. Repairs m ust be made in accordance with the relevant safety standards.

4. It is essential that safety critical components are replaced by approved parts.

5. If mains voltage selector is provided, check setting for local voltage.

Burrs formed during molding may be left over on some parts of the chassis. Therefore, pay attention to such burrs in the case of preforming repair of this system.

In regard with component parts appearing on the silk-screen pr inted side (parts side) of the PWB diagrams, the parts that are printed over with black such as the resistor ( ), diode ( ) and ICP ( ) or identified by the " " mark nearby are critical for safety. When replacing them, be sure to use the parts of the same type and rating as specified by the manufacturer. (Except the J and C version)

1-2

Important for laser products

MX-DVA5

1.CLASS 1 LASER PRODUCT

2.DANGER : Invisible laser radiation when open and inter

lock failed or defeated. Avoid direct exposure to beam.

3.CAUTION : There are no serviceable parts inside the Laser Unit. Do not disassemble the Laser Unit. Replace the complete Laser Unit if it malfunctions.

4.CAUTION : The compact disc player uses invisible laserradiation and is equipped with safety switches whichprevent emission of radiation when the drawer is open and the safety interlocks have failed or are de feated. It is dangerous to defeat the safety switches.

POSITION OF LABELS

5.CAUTION : If safety switches malfunction, the laser is able

to function.

6.CAUTION : Use of controls, adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure.

CAUTION

Please use enough caution not to see the beam directly or touch it in case of an adjustment or operation check.

CLASS 1 LASER PRODUCT

LASER CAUTION LABEL

1-3

MX-DVA5

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.

2. About the earth processing for the destruction prevention by static electricity

In the equipment which uses optical pick-up (laser diode), optical pick-up is destroyed by the static electricity of the work environment. Be careful to use proper grounding in the area where repairs are being performed.

2-1 Ground the workbench

Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing the traverse unit (optical pickup) on it.

2-2 Ground yourself

Use an anti-static wrist strap to release any static electricity built up in your body.

(caption) Anti-static wrist strap

Conductive material (conductive sheet) or iron plate

3. Handling the optical pickup

1. In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement optical pickup are shorted. After replacement, return the shorted parts to their original condition. (Refer to the text.)

2. Do not use a tester to check the condition of the laser diode in the optical pickup. The tester's internal power source can easily destroy the laser diode.

4. Handling the traverse unit (optical pickup)

1. Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit.

2. Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific details, refer to the replacement procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to take too long a time when attaching it to the connector.

3. Handle the flexible cable carefully as it may break when subjected to strong force.

4. It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.

Attention when traverse unit is decomposed

Because the CD mechanism assembly of this model is a unit component, the individual component parts consisting of the CD mechanism assembly are not supplied separately. If you need to decompose the traverse unit, short-circuit the connector of the flexible board by using a metal clip and the like prior to decomposing the traverse unit.

Flexible board

Metal clip

CD mechanism assembly

CD travers unit

1-4

MX-DVA5

Disassembly method

Removing the metal cover

(See Fig.1 and 2)

Remove the three screws A attaching the metal cover on the back of the body.

Remove the six screws B attaching the metal cover on both sides of the body.

Remove the metal cover from the body by lifting the rear part of the cover.

ATTENTION:

Do not break the front panel tab fitted to the metal cover.

Fig.1

Metal cover

Removing the CD/ DVD changer unit

(See Fig.3 to 6)

Prior to performing the following procedure, remove the metal cover.

Disconnect the card wire which is attached with adhesive to the left side of the CD/ DVD changer unit.

Disconnect the harness from connector ACW4 and DCW1 of the CD/ DVD servo board on the back of the CD/ DVD changer unit.

Disconnect the harness from connector LCW2 and LCW6 on the DVD power board.

Disconnect the card wire from connector UCW3 on the FLdispaly & system control board.

Remove the two screws C attaching the CD/ DVD changer unit on the back of the body.

Remove the two screws D attaching the CD/ DVD changer unit on the both side of the body.

ACW4/ DCW1

CD/ DVD

servo board

Front panel

assembly

Fig.2

CD/ DVD changer unit

Rear panel

DVD power

board

LCW6

LCW2

(Bottom side)(Bottom side)

Draw the CD changer unit upward from behind while pulling the rear panel outward.

Fig.3

1-5

MX-DVA5

FLdispaly & system

control board

UCW3

Front panel

assembly

Fig.4

Adhesive card wire strap

CD/ DVD changer unit

Rear panel

Fig.5

CD/ DVD changer unit

Rear panel

1-6

Fig.6a

Front panel assembly

Removing the front panel assembly

(See Fig.7 to 9 )

Prior to performing the following procedure, remove the metal cover and the CD/ DVD changer unit.

Disconnect the card wire from connector FCW3 and the harness from connector JCW1, JCW2 ECW1 and HCW3 on the inner side of the main board in the body.

Remove the two screws E attaching the front panel assembly on both sides of the body.

Remove the screw F attaching the earth terminal extending from the cassette mechanism assembly.

Remove the screw G attaching the front panel assembly and main board.

Remove the screw H attaching the front panel assembly on the bottom of the body.

Release the two joints a on both sides and two joints b on the bottom of the body using a screwdriver.

Front panel assembly

Joint a

earth wire

Fig.6b

FCW3

Fig.7

JCW2

Rear panel

Main board

ECW1

JCW1

HCW3

MX-DVA5

Front panel assembly

Main board

Fig.8

Joint c

Removing the heat sink, AMP board and

DVD power board (See Fig.10 to 12)

Prior to performing the following procedure, remove the metal cover and the CD/ DVD changer unit.

Remove the four screws I attaching the heat sink cover on the back of the body. Remove the heat sink cover.

Bottom side

Joint b

Fig.9

Joint b

Remove the four screws J attaching the heat sink, AMP board and DVD power board to the rear panel on the back of the body.

Remove the two screws K attaching the speaker terminal to the rear panel on the back of the body.

Disconnect the card wire from connector ACW1 and the harness from connector ACW2 on the AMP board.

Disconnect the harness from connector LCW5 and LCW4 on the DVD power board.

After moving the heat sink upward, remove the claws. Then pull out the heat sink, AMP board and DVD power board inward.

Rear panel

DVD power board

Heat sink

cover

Rear panel

Heat sink

Fig.10

Tuner terminal

LCW5

ACW2

ACW1

Fig.12

LCW4

AMP board

Speaker terminal

Fig.11

1-7

MX-DVA5

Removing the tuner board

(See Fig.11 and 13)

Prior to performing the following procedure, remove the metal cover and CD/ DVD changer unit.

Rear panel

Disconnect the card wire from connector CON01 on the tuner board.

Remove the two screws L attaching the tuner board.

Removing the rear panel (See Fig.14)

Prior to performing the following procedure, remove the metal cover, CD/ DVD changer unit, heat sink & AMP board and tuner pack.

Remove the one screw M (Except UY), three screws N and five screws N' attaching the rear panel.

CON01

Main board

Tuner board

Fig.13

Rear panel

Removing the main Board

(See Fig. 15)

Prior to performing the following procedure, remove the metal cover, CD/ DVD changer unit, heat sink & AMP board tuner pack and rear cover.

Disconnect the card wire from connector FCW3 and the harness from connector JCW1, JCW2, ECW1 and HCW3 on the main board.

Disconnect the harness from connector PCW1 on the power transformer board.

Remove the screw G attaching the main board holder. (See Fig.8)

Remove the two screws O attaching the heat sink and bottom chassis.

(Except UY)

FCW3

Transformer board

JCW2

PCW1

Fig.14

ECW1

JCW1

Main board

HCW3

1-8

Fig.15

MX-DVA5

Removing the power ICs and DVD power board (See Fig.16 and 17)

Prior to performing the following procedure, remove the metal cover, CD/ DVD changer unit, heat sink, AMP board and DVD power board.

Remove the four screws P attaching the power ICs to the heat sink.

Unsolder the power ICs solder point.

Remove the three screws Q and three screws R attaching the DVD power board to the heat sink.

Heat sink

AMP board

Heat sink

DVD power board

Power ICs solder point

Fig.16a

AMP board

Fig.17

DVD power board

Removing the power transformer

(See Fig .18)

Prior to performing the following procedure, remove the metal cover, CD/ DVD changer unit, heat sink & AMP board, tuner pack and rear cover.

Disconnect the power cord from connector RCW2 of the power transformer board.

Disconnect the harness from connector PCW1 of the power transformer board.

Remove the four screws S attaching the power transformer.

Power transformer

RCW2

Power cord

Fig.16b

Heat sink

PCW1

Fig.18

1-9

MX-DVA5

Prior to performing the following procedure, remove the metal cover, the CD/ DVD changer unit and the front panel assembly.

Removing the power / DVD switch board

(See Fig.19)

Disconnect the card wire from connector UCW1 of the power / DVD switch board.

Remove the five screws T attaching the power / DVD switch board and release the tab c outward.

Removing the FL display & system control board (See Fig.19)

Disconnect the card wire from the connector UCW3, UCW4,UCW5 and UCW6 on the FL & system control board.

Remove the five screws U attaching the FL & system board.

Disconnect the card wire from the connector UCW2 on the FL & system control board.

Removing the headphone board

(See Fig.20)

Prior to performing the following procedure remove the FLdisplay & system control board.

You can pull out the headphone board.

Power / DVD switch board

UCW2

UCW3 UCW4

Front board

Tab d

MIC board

(Except UY)

Card wire f

Tab e

UCW1

Tab c

FL diplay & system

control board

UCW5

UCW6

Fig.19

Headphone board

Cassette mechanism assembly

Removing the front board / MIC board

(See Fig. 20 and 21)

Prior to performing the following procedure, remove the FL display & system control board. No MIC board for UY version.

Pull out the volume knob, subwoofer level knob and sound mode nob from front side.

Remove the eleven screws V attaching the front board and release the two tabs d outward.

Release the two tabs e outward and remove the mic board.

Removing the cassette mechanism assembly (See Fig.20)

Disconnect the card wire f from the mechanism board on the cassette mechanism assembly.

Remove the six screws W attaching the cassette mechanism assembly.

Fig.20

Sound mode knob

Subwoofer level knob

Volume knob

Fig.21

1-10

MX-DVA5

Prior to performing the following procedure, remove the CD/ DVD changer unit.

Removing the DVD tray (See Fig.1 to 3)

Disconnect the card wire from connector SCW1 of the CD servo board.

Turn the black loading pulley gear on the under side of the CD/ DVD changer unit in the direction of the arrow and draw the DVD tray toward the front until it stops.

3. Disconnect the card wire from connector LCW1 of the CD/ DVD servo board on the upper side of the CD/ DVD changer unit.

4. Push down the two tray stoppers marked a and pull out the DVD tray.

Loading pulley

CD/ DVD

servo board

SCW1

DVD tray

gear

Fig.1

Reinstall the DVD tray (See Fig.4 and 5)

Align the gear-cam with the gear-tray as shown fig.3, then mount the DVD tray.

When assembling the DVD tray, take extreme care not engage with gear - synchro.

Gear-cam

Gear-tray

Gear-convert

Gear-cam

timing point

DVD tray

(Tray stopper)

CD servo board

Fig.2

a (Tray stopper)

LCW1

Fig.3

Gear-synchro

Gear-convert

Gear-tray

DVD tray

Fig.4 Fig.5

1-11

MX-DVA5

Removing the sensor board / the turn table motor assembly (See Fig.6 to 8)

Prior to performing the following procedure, remove the CD tray.

Remove the screw A attaching the sensor board and release the two tabs b attaching the sensor board on the under side of the DVD tray.

Disconnect the harness from connector CW1 on the sensor board and release the harness from the two hooks c. Remove the sensor board.

Remove the screw B attaching the turn table. Detach the turn table from the tray.

Pull outward the tab marked d attaching the turn table motor assembly on the upper side of the tray and detach the turn table motor assembly from the tray.

Tray

Tab b

CW1

Tab b

Sensor board

Fig.6

Turn table

Turn table motor assembly

Removing the belt, the CD/ DVD servo board and the switch board (See Fig.9 and 10)

Prior to performing the following procedure, remove the DVD tray.

Detach the belt from the pulley on the upper side of the CD/ DVD changer unit (Do not stain the belt with grease).

Fig.7

Fig.8

Motor

Belt

Remove the two screws C attaching the motor.

Disconnect the card wire from the connector SCW1 on the CD/ DVD servo board.

Remove the three screws D attaching the CD/ DVD serbo board .

1-12

CD/ DVD changer unit

Fig.9

MX-DVA5

Removing the CD/ DVD mechanism holder assembly (mechanism included)

(See Fig.11 to 13)

SCW1

CN5

Fig.10

CD/ DVD servo board

CD/ DVD mechanism

holder assembly

Disconnect the card wire from connector CN5 on the motor board in the CD mechanism holder assembly on the under side of the CD changer unit.

Remove the screw E attaching the shaft on the right side of the CD mechanism holder assembly.

Pull outward the stopper fixing the shaft on the left side and remove the CD/ DVD mechanism holder assembly from behind in the direction of the arrow .

Pull out the CD/ DVD mechanism holder assembly.

CD/ DVD changer unit

Stopper

Motor board

Fig.11

CD/ DVD mechanism holder assembly

Fig.12

CD/ DVD mechanism holder assembly

Fig.13

1-13

MX-DVA5

Removing the record/playback mechanism.

Removing the R/P head.

Remove the screw A on the right side of the R/P head.(Fig.1)

Remove the screw B on the left side of the R/P head.(Fig.1)

Removing the pinch roller.

Pull out the pinch roller by opening the pinch roller stopper outward to unlock .(Fig.2)

When reassembling the pinch roller, refer to fig. 3 to hook up the spring.

R/P Head

Pinch roller

Fig.1

Pinch roller assembly

Pinch roller

stopper

Stopper

Return spring

Fig.2

Pinch roller

Return spring

Fig.3

Pinch roller

spring

1-14

MX-DVA5

Removing the motor.

Remove the two screws C fixing the motor. Be careful to grease's splash when the drive belt comes off.(Fig.4, Fig.5)

Unsolder the motor terminal.(Fig.4)

Removing the mechanism board.

Unsolder the four parts a on the solenoid

1. coil terminal.(Fig.4)

Remove the two screws D fixing the board.(Fig.4)

2. Unhook the three parts b from the board.(Fig.4)

3. Remove the mechanism board.(Fig.4)

Mecha.

Drive belt (Flat)

board

Motor

terminal

Fig.4

Drive belt

Motor

Removing the flywheel.

Remove the cut-washers at c and d from the capstan shaft, then remove the flywheel. When reassembling the flywheel, be sure to use new washers as they cannot be reused. (Fig.7, Fig.8)

Capstan

washer

Drive belt

Fig.5

Capstan

washer

Fig.6

Sleeve

Flywheel

FR belt

Fig.7

Flywheel

Sleeve

Flywheel

Washer

FR belt

Fig.8

1-15

MX-DVA5

< Speaker section >

Removing the side panel (See Fig. 1)

Remove the five screws A and B attaching the side panel, then remove the side panel.

Removing the side speaker

(See Fig. 2 and 3)

Side panel

Fig.1

Side speaker

Front panel

Prior to performing the following procedure, remove the side panel.

Remove the fore screws C attaching the side speaker.

Pull out the side speaker and remove the speaker cord from the speaker terminal.

Fig.2

Side speaker

1-16

Speaker terminal

Fig.3

MX-DVA5

Wiring connection

Amp board

3711-001167

3809-000492

3809-001228

ACW2

3809-001224

CD key switch board

UCW1

3711-000820

ACW3

ACW1

3708-001094

UCW7

3809-001185

MIC board

3708-000181

Front key switch board

2 0

AH39-20008M

MCW3

AH39-00254A

AH39-00244A

AH39-00248A

MCW2

3711-000190

9 0

3711-003112

3708-000178

UCW2

UCW3

3708-001212

Front / Display board

RCW2

RFS3

RFS5

RFS6

RFS7

PCW1

UCW4

3708-000451

3708-001488

3708-000492

RFS4

RFS8

UCW6

UCW5

RFS2

Power transformer

9 0

AH39-00096C

9 0

3809-001225

3809-001185

AH39-00097A

Color codes are shown below. 1 Brown

2 Red 3 Orange 4 Yellow 5 Green 6 Blue 7 Violet 8Gray 9 White 0 Black

LCW4

3711-001095

LCW6

3711-000988

LCW2

LCW1

LCW5

3711-000988

9 0

CW1

ACW2

AH39-00097A

DVD Power board

DVD board

VCW2

DCW1

9 2

ACW4

3809-001237

3809-001222

CW302

Voice board

CW301

Tuner board

CON1

3710-000209

FCW1

3708-000122

OCW

3711-000907

RCW6

3711-000907

JCW1

Main board

JCW2

FCW3

3708-000258

KCW2

FCW2

3711-001557

KCW1

3708-001094

3711-003107

JCW3

3711-003111

RW2

HCW3

RW1

3711-001062

VCW1

AH39-00022A

HCW2

AH39-00247A

E.phone J.board

Cassette mechanism

AH39-00202A

1-17

MX-DVA5

TESTER

MAIN PCB

VT GND

Adjustment method

1. Tuner

ITEAM

Received FREQ. Adjustment

point

Output

* Adjustment Location of Tuner PCB

AM(MW) OSC Adjustment

522~1611 KHz

1~7.0 V

AM(MW) RF Adjustment

594 KHz

Maximum Output(Fig1-4)

Fig 1-4 OSC Voltage

LW OSC Adjustment

146~290 KHz

2~7.0 V

AM(MW) RF Adjustment

150 KHz

Maximum Output(Fig1-4)

1-18

MX-DVA5

FM THD Adjustment

SSG FREQ.

98 MHz

Adjustment point

FM DETECTOR COIL

(FM DET)

Output

60 dB

Minumum Distortion (0.4% below) (Figure 1-1)

FM Search Level Adjustment SSG FREQ. Adjustment

point

(SVR1)

Output

BEACON SENSITIVITY SEMI-VR(20K)

28 dB

98 MHz

Output GND

FM S.S.G

FM Antenna Terminal

Speaker Terminal

SET

Input

output

Distortion Meter

Figure1-1 IF CENTER and THD Adjustment

FM Antenna

SET

FM IN

FM S.S.G

28 dB

GND

Oscilloscope

Input

Adjust SVR1 so that “TUNED” of FL T is lighted (Figure 1-2)

*Adjust FM S.S.G level to 28dB

AM(MW) I.F Adjustment

SSG FREQ. Frequency

450 kHz 522 kHz

Adjustment point

AM IF

Maximum output (Figure 1-3)

Figure1-2 FM Auto Search Level Adjustment

60cm

OUTPUT

AM SSG 450KHZ

INPUT

AM ANT IN

Speaker Terminal

OUTPUT

VTVM Oscilloscope

Figure1-3 AM I.F Adjustment

20 k

AM IF

1-19

MX-DVA5

2 Cassette Deck

2-1 To Adjust Tape Speed

Notes

1) Measuring tape : VT712(or equivalent) (Tapes recorded with 3kHz)

2) Connect the cassette deck to the frequency counter

as in figure 1-5.

Step

Item

Pre-Setup Condition

Pre-Setup

1) Deck 1:VT712

TAPE

SPEED Control

REVERSE PLAY

OUT (connected to the frequency counter)

Recording /Play head

AZIMUTH control screw

2) Press PLAY SW button

3) Deck 2:Same as above

REVERSE PLAY

(FORWORD)

Cassette Deck

SPK OUT

To Adjust

Turn VSR1 to left and right (FRONT PCB)

Cassette Deck

SPK OUT

(GND)

Figure 1-5

VTVM

In Out

Figure 1-7

Frequency Counter

Standard

3KHz 30Hz

Oscilloscope

output

Remark

1-20

Figure 1-6

Audio OSC.

SET (MAIN PCB)

AUX IN

LINE OUT

JCW3

Figure 1-8

VTVM

IN OUT

Oscilloscope

2-2 T o Adjust PlayBack Level/REC

Notes

1) Before the actual adjustment, clean the play/recording head.

2) Measuring tape : i) VT-703 (or equivalent 10kHz AZIMUTH control) ii) AC-225

3) The cassette deck is connections as shown in figure 1-7.

1. Adjust Deck A Play Level

MX-DVA5

Step

Item

AZIMUTH1

Pre-Setup

Condition

SPK OUT (VTVM is connected to the scope)

Pre-Setup

After putting VT703 into Deck A

1) Press FWD PLYA button.

2) Press RVS PLAY button.

2. Adjust Deck B Play Level/REC BIAS

Step

Item

AZIMUTH1

Pre-Setup

Condition

SPK OUT (VTVM is connected to the scope)

Pre-Setup

After putting VT703 into Deck B

1)Press FWD PLAY button.

2)Press RVS PLAY button.

To Adjust

- Turn the control screw to as shown in Figure 1-6.

To Adjust

- Turn the control screw to as shown in Figure 1-6.

Standard

Max output and same phase (both channels)

Standard

Max output and same phase (both channels)

Remark

After adjustment

secure it with

REGION LOCK.

Adjust AZIMUTH when you exchange the head.

Remark

After adjustment

secure it with

REGION LOCK.

Adjust AZIMUTH when you exchange the head.

Recording Bias Voltage

Fig 1-8

After putting AC225 into Deck B

1)Press REC PLYA button.

2)MAIN PCB JCW3, connectted to VTVM

Turn JSR2L,JSR2R

to the right and left

7mV

1-21

MX-DVA5

Troubleshooting

1.Amplifier

Power Malfunction

No Output

1-22

2.Tuner Malfunction(FM/AM)

MX-DVA5

3.Tape

1-23

MX-DVA5

4.CD

1-24

Is state of rotation proper?

Is signal of RAO proper? (#2, #3, #4, #5 of WIC101)

Description of major ICs

MX-DVA5

74HCU04 (VIC6) : Optical

1. Pin configuration.

1A 1 14 Vcc

1Y 2 13 6A 2A 3 12 6Y

2Y 4 11 5A

04U

3A 5 10 5Y 3Y 6 9 4A

GND 7 8 4Y

BA4560 (FIC2, FIC4, FIC5, HIC1, JIC2) : OP amp.

1.Pin layout

OUT1

– IN1

1ch

–

+ IN1

BA3837(IC301): MIC Mixer

1. Block diagram

C B A ROUT LP LP LP RIN

16 15 14 13 12 11 10 9

–

LOGIC

–

OUT2

2ch

– IN2

–

+ IN2

–

L + R

–

123456 78

MIC LOUT FK TK LIN BIAS GND

SW2

SW1

L – R

– +

–

2.Pin function

Pin No.

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16

Symbol

VCC

MIC IN

LOUT

FK TK

LIN BIAS GND

RIN LPF1 LPF2 LPF3

ROUT CONTA CONTB

CONTC

I/O

Power supply

Microphone mixing input

Channel L output

Non connect

Channel L input

Signal bias

Connect to GND

Channel R input

Connects to LPF time constant element

LPF outpout

Channel R output

Mode select input A

Mode select input B

Mode select input C

Description

1-25

+ 57 hidden pages

JVC MXDVA-5-UW Service manual

Specifications and Main Features

Frequently Asked Questions

User Manual