JVC MX J270V Service Manual

SERVICE MANUAL

COMPACT COMPONENT SYSTEM

MX-J270V

RM-SMXJ111V REMOTE CONTROL

CLOCK

TIMER

1

2 3

–+

SELECT

4 5 6

ECHO SET

7 8 9

10+10

PREV NEXT RETURN SELECT

A – TAPE - B

REC PAUSE

SHIFT FM MODE

SOUND

VOLUME

MODE

MX-J270V

US UX

STANDBY

PLAY & EXCHANGER

VIDEO CD

1 BIT

DUAL D/A CONVERTER

PHONES

TAPE

MIC LEVEL

AUX

MIN

MAX

ON SCREEN

SLEEP

V.INTRO

HIGHLIGHT

PLAY MODE

CD3CD2CD1

STILL

C D

TAPE

AUX

FM/AM

i

KEY CONTROL

I

MIC

SP-MXJ270V

NTSC/PAL COMPATIBILITY

MX-J270V

KEY CONTROL

MPX/V.REPLACE/V.MASKING

REC

START/STOP

– PRESET +

TUNING / VCD NUMBER

–

SOUND MODE ACTIVE BASS EX.

AUTO REVERSE

DUBBING

CD REC START

PLAY

AUTO REVERSE

CA-MXJ270V

ECHO

+

CD

REC/PLAY

NTSC/PAL PAL AUTO

CD

VOLUME

+

–

RANDOM

CD

SELECT

REPEAT

FM /AM

SP-MXJ270V

Area Suffix

Singapore

Saudi Arabia

Contents

Safety Precautions Important for laser products Preventing static electricity Disassembly method Adjustment method

1-2 1-3 1-4 1-5 1-22

PlayBack

Control

Flow of functional operation until TOC read Maintenance of laser pickup Replacement of laser pickup Description of major ICs

VIDEO CD

1-26 1-27 1-27 1-28

No.20880

Nov. 2000

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. 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 further relieve the manufacture of responsibility for personal injury or proper ty damage resulting therefrom.

3. Many electrical and mechanical par ts 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 or iginal 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 perform 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 eachexposed metal part, par ticularly 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.

Warning

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 must 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.

1-2

CAUTION

!

Important for laser products

MX-J270V

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.

VARNING : Osynlig laserstrålning är denna del är öppnad

och spårren är urkopplad. Betrakta ej strålen.

VARO : Avattaessa ja suojalukitus ohitettaessa olet

alttiina näkymättömälle lasersäteilylle.Älä katso säteeseen.

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.

ADVARSEL : Usynlig laserstråling ved åbning , når

sikkerhedsafbrydere er ude af funktion. Undgå udsættelse for stråling.

ADVARSEL : Usynlig laserstråling ved åpning,når

sikkerhetsbryteren er avslott. unngå utsettelse for stråling.

REPRODUCTION AND POSITION OF LABELS

WARNING LABEL

DANGER : Invisibie laser radiation when open and interlock or defeated. AVOID DIRECT EXPOSURE TO BEAM (e)

VARO : Avattaessa ja suojalukitus ohitettaessa olet alttiina näkymättömälle lasersäteilylle.Älä katso säteeseen. (d)

CLASS 1 LASER PRODUCT

VARNING : Osynlig laserstrålning är denna del är öppnad och spårren är urkopplad. Betrakta ej strålen. (s)

ADVARSEL :Usynlig laserstråling ved åbning , når sikkerhedsafbrydere er ude af funktion. Undgå udsættelse for stråling. (f)

1-3

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.

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

1-4

MX-J270V

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. Remove the metal cover from the body while lifting

up the rear part of the metal cover.

1.

2.

3.

Removing the metal cover

(See Fig.1 to 3)

Disassembly method

Fig.3

Fig.2

Fig.1

Metal cover

A

Metal cover

B

Metal cover

B

1-5

MX-J270V

Removing the CD changer mechanism assembly (See Fig.4 to 7)

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

1.

Disconnect the card wire from connector CN308 and CN309 connecting the CD servo board and the main board.

2.

Disconnect the harness from CN310 on the main board.

3.

Remove the two screws C attaching the CD changer mechanism assembly on the top of the body.

4.

Remove the plastic rivet a fixing the main board to the front panel assembly on the left side of the body.

5.

Remove the two screws D from the rear panel.

6.

Cut off the band b and band c which bundle two harnesses coming from the MIC/headphone board and one harness coming from the video board, respectively.

CD changer mechanism assembly

Plastic rivet a

Front panel

assembly

Main board

CN303

C

Fig.4

CD changer mechanism assembly

CN310

CN308

Rear panel

7.

Detach upward the rear part of the CD changer mechanism assembly while pulling the front panel assembly and the rear panel outward, then pull out the front part backward and upward.

Rear panel

CN309

Main board

Fig.5

D

Rear panel

Fig.6

CD changer mechanism

assembly

Front panel assembly

1-6

Pull outward

Band b

Band c

Fig.7

Pull outward

Main board

MX-J270V

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.

Turn over the body and remove the four screws E. Release the joint d and e on both sides of the body

using a screwdriver, and detach the front panel assembly toward the front.

1.

2.

3.

Removing the front panel assembly

(See Fig.8 to 11)

Fig.9

Fig.8

Fig.10

Fig.11

Main board

CN301

CN302

CN306

CN307

CN312

CN305

E

Front panel assembly

Joint d

Front panel assembly

Joint e

(Bottom)

1-7

MX-J270V

Removing the rear cover, the 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.

1.

Remove the two screws F and the rear cover on the back of the body.

2.

Remove the four screws G and the seven screws H attaching the main board and the heat sink to the rear panel.

3.

Remove the screw I attaching the rear panel to the chassis base.

4.

Remove the two screws J attaching the rear panel to the voltage selector.

5.

Remove the two screws K attaching the rear panel to the video board.

F

Rear cover

H

G

(To Earth bracket)

H

Rear panel

F

Fig.12

Rear panel

J

K

6.

Release the lower two joints f and g on both sides of the rear panel using a screwdriver and detach the rear panel backwards.

Rear panel

G

I

Fig.13

Joint f

Fig.14

1-8

Rear panel

Joint g

Fig.15

MX-J270V

Prior to performing the following procedures, remove the metal cover, the CD changer mechanism assembly, the rear cover, the rear panel, the voltage selector and the video board. It is not necessary to remove the front panel assembly.

Disconnect the card wires from connector CN302, CN306, CN307 and the harnesses from CN301, CN305, CN901A and CN901B on the inside of the main board.

Disconnect the harness from CN312 on the video board.

From the right side of the body, remove the screw M attaching the main board to the chassis base.

1.

2.

3.

Removing the main board

(See Fig.16 to 19)

Prior to performing the following procedure, remove the rear cover, rear panel, voltage selector and the video board.

Remove the two screws N attaching the heat sink to the main board. Remove the IC bracket 1 and 2 on the back of the heat sink.

Pull out the heat sink toward you.

1.

2.

~To remove the heat sink from

the main board~

Prior to performing the following procedures, remove the main board.

Release the two joints h and i using a screwdriver and detach the DSP board toward you.

1.

Removing the DSP board

(See Fig.19)

Fig.16

Fig.17

M

Main board

CN306

CN307

CN302

CN305

CN301

CN901A,CN901B

Fig.18

Heat sink

N

Main board

Fig.19

Heat sink

IC bracket 2

IC bracket 1

CN312

DSP board

Joint i

Joint h

DSP board

Video board

1-9

MX-J270V

Removing the power transformer assembly (See Fig.20 to 22)

Prior to performing the following procedure, remove the metal cover, the CD changer mechanism assembly and the voltage selector.

1.

Disconnect the harness from connector CN901A and CN901B on the inside of the main board.

2.

Cut off the tie band j of the power transformer assembly and unsolder the power cord. (Make sure to bundle the wires after repair.)

3.

Remove the four screws O attaching the power transformer assembly.

When removing the power transformer assembly with the power cord, remove the rear panel and pull out the power cord stopper from the bottom chassis upward.

CN901A,CN901B

Video board

Voltage selector board

Power transformer assembly

Fig.20

O

Voltage selector board

Front panel

assembly

Voltage selector board

Video board

Tie band j

Rear panel

Power cord stopper

O

Fig.21

Power transformer

Fig.22

Power transformer

assembly

1-10

MX-J270V

Removing the MIC/headphone board (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.

1.

Remove the two screws P attaching the MIC /headphone board.

2.

Pull out the MIC LEVEL knob from front side.

Removing the cassette mechanism assembly (See Fig.25)

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

1.

Disconnect the card wire from connector CN305 on the cassette amplifier board.

2.

Remove the eight screws Q attaching the cassette mechanism assembly.

3.

Detach the cassette mechanism assembly toward you.

Removing the cassette amplifier board

(See Fig.26)

Fig.23

Cassette mechanism assembly

Q

MIC/headphone board

Front panel assembly

P

MIC LEVEL knob

Fig.24

Front panel assembly

CN305

Q

Prior to performing the following procedure, remove the cassette mechanism assembly.

1.

Disconnect the card wire from connector CN301 and CN302 on the cassette amplifier board.

2.

Remove the six screws R attaching the cassette amplifier board.

3.

Unsolder the soldering k on the harness for the DC motor.

4.

Detach the cassette amplifier board toward you.

Q

Cassette amplifier board

DC motor

R

Soldering k

CN302

R

Q

R

Q

Fig.25

Fig.26

Cassette amplifier board

Cassette mechanism

board

R

CN301

R

1-11

MX-J270V

Removing the display board and the bracket (See Fig.27 and 28)

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

1. the cassette amplifier board.

Remove the four screws S attaching the front panel

2. assembly.

Remove the four screws T attaching the front panel

3. assembly.

Unsolder FW701, FW702, FW703, FW704 and

4. FW705 on the display board. Disconnect the harnesses extending from the power switch board, the eject switch board, the volume board and the multi-control board respectively

Removing each board in the front panel assembly (See Fig.29 to 31)

Prior to performing the following procedure, remove the display board.

~Removing the multi-control board~ (See Fig.29)

1.

Remove the eight screws U attaching the multicontrol board.

~Removing the volume board~ (See Fig.30 and 31)

1.

Pull out the volume knob on the front side of the front panel assembly and remove the nut attaching the volume board.

2.

Unhook the two hooks l on the back of the front panel assembly and detach the volume board.

~Removing the eject switch board ~ (See Fig.29)

Remove the four screws V attaching the eject switch

1.

board.

~Removing the power switch board~ (See Fig.29)

Remove the three screws W attaching the power

1.

switch board.

Front panel

assembly

Bracket

Display board

FW703

FW701

T

Display board

Eject

switch

board

Volume

board

U

V

T

S

Fig.27

Fig.28

U

Front panel assembly

FW702

T

FW704 FW705

W

Power

switch

board

Multi-

control

board

U

1-12

Fig.30

Volume

knob

Volume

board

Fig.31

Hooks l

Front panel assembly

U

Fig.29

CD Traverse Mechanism Type:C3CN Section

Removing the CD Servo control board (See Fig.1)

1.

Remove the Metal cover.

2.

Remove the CD Traverse mechanism assembly.

3.

From bottom side the CD Traverse mechanism assembly, remove the one screw A retaining the CD Servo control board. From the connectors CN601, CN603, CN604 on the CD

4. Servo control board, disconnect the card wire, from the connector CN602, disconnect the six pin connector wire. Disengage the two engagements "a" , remove the CD

5. Servo control board.

Removing the CD tray assembly (See Fig.2~4)

Remove the front panel assembly.

1. Remove the CD Traverse mechanism assembly.

2. Remove the CD Servo control board.

3. Remove the screw B retaining the disc stopper

4. (See Fig.3). Remove the three screws C retaining the T.bracket

5. (See Fig.3). From the clamper base section "c" , remove both of the

6. edges fixing the rod(See Fig.2 and 3). Remove the screw D retaining the clamper assembly

7. (See Fig.3). From the left side face of the chassis assembly, remove

8. the one screw E retaining both of the return spring and lock lever(See Fig. 4). By removing the pawl at the section "d" fixing the return

9. spring, dismount the return spring(See Fig.4). Remove the three lock levers(See Fig.4).

10.

Disc stopper

T.Braket

MX-J270V

A

CD servo control board

CN604

CN 602

CN603

CN601

a

Fig.1

Clamper base

b

Rod

c

T.Braket

Fig.2

d

C

b

c

Clamper ass'y

B

C

Lod stopper (C/J version only)

Return spring

C

D

E

Lock lever

Fig.4

Fig.3

1-13

MX-J270V

11.

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

12. shown in Fig.6 from to the second or fifth hole on the left side face of the CD Traverse mechanism assembly.

[Caution]

13.

14.

15.

Chassis assembly

In case the driver unit elevator is not at above position, set the elevator to the position as shown in Fig.7 by manually turning the pulley gear as shown in Fig.8.

Manually turn the motor pulley in the clockwise direction until the lifter unit stopper is lowered from the section "e" of CD tray assembly(See Fig.8). Pull out all of the three stages of CD tray assembly in the arrow direction "f" until these stages stop (See Fig.6). At the position where the CD tray assembly has stoppend, pull out the CD tray assembly while pressing the two pawls "g and g' "on the back side of CD tray assembly(See Fig.9). In this case, it is easy to pull out the assembly when it is pulled out first from the stage CD tray assembly.

Stopper

e

CD tray assembly

Fig.5

Refer to Fig.7

Pulley gear

Pawl

CD tray assembly

g

f

Drive unit of elevator

Fig.7Fig.6

CD tray assembly

1-14

Motor pulley

Fig.8

Pawl ,

g

Fig.9

g'

MX-J270V

Removing the CD mechanism assembly (See Fig.10)

1.2.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. Remove the four screw F retaining the CD mechanism assembly.

Removing the CD mechanism (See Fig.11 and 12 )

For dismounting only the CD mechanism without

1. removing the CD mechanism assembly, align the shaft "j" of the CD mechanism assembly to the position shown Fig.11 while turning the cam R1 and R2 assembly in the arrow direction "k". By raising the CD mechanism assembly in the arrow

2. direction "l" , remove the assembly from the lifter unit (See Fig.12).

Cam R1, R2 assembly

Cams R1, R2 assembly

Arrow

h

i

F

CD mechanism assembly

F

Fig.10

CD mechanism

Arrow

k

j

Fig.11

Removing the CD pick unit (See Fig.13 )

Move the cam gear in the arrow direction m . Then, the

1. CD pickup unit will be moved in the arrow direction n . According to the above step, shift the CD pickup unit to

2. the center position. While pressing the stopper retaining the shaft in the

3. arrow direction o , pull out the shaft in the arrow direction p . After dismounting the shaft from the CD pickup unit,

4. remove the CD pickup unit

Lifter unit

o

Stopper

Shaft

Fig.12

CD Pickup unit

n

m

Shaft

p

Stopper

Fig.13

Arrow

CD mechanism

Shaft

Cam gear

l

1-15

MX-J270V

Removing the actuator motor board (See Fig.14, 15)

Absorb the four soldered positions "q" of the right and

1. left motors with a soldering absorber(See Fig.14). Remove the two screws G retaining the actuator motor

2. board(See Fig.14). Remove the two screws H retaining the tray select

3. switch board(See Fig.15).

Removing the cam unit (See Fig.15 to 18 )

1.

Remove the CD mechanism assembly.

2.

While turning the cam gear r, align the pawl "s" position of the drive unit to the notch position(Fig.15) on the cam gear r. Pull out the drive unit and cylinder gear(See Fig.17).

3. While turning the cam gear r, align the pawl "t" position

4. of the select lever to the notch position(Fig.18) on the cam gear r. Remove the four screws I retaining the cam unit(cam

5. gear r and cams R1/R2 assembly)(See Fig.18).

Motor L

G

Motor R

q

G

Actuator motor board

Fig.14

Chassis assembly

CN801

Fig.15

CN802

Drive unit

Tray select switch board

Cylinder gear

CN804

Drive unit

s

H

Cam gear L

I

Cam gear r

Fig.16

I

Cams R1, R2 assembly

Cam unit

I

1-16

Fig.17

t

Select lever

Fig.18

MX-J270V

Removing the actuator motor and belt (See Fig.19 to 22)

1.

Remove the two screws J retaining the gear bracket (See Fig.19).

2.

While pressing the pawl "u" fixing the gear bracket in the arrow direction, remove the gear bracket (See Fig.19). From the notch "v section" on the chassis assembly

3. fixing the edge of gear bracket, remove and take out the gear bracket(See Fig. 20). Remove the belts respectively from the right and left

4. actuator motor pulleys and pulley gears(See Fig. 19). After turning over the chassis assembly, remove the

5. actuator motor while spreading the four pawls "w" fixing the right and left actuator motors in the arrow direction(See Fig. 21).

[Note]

When the chassis assembly is turned over under the conditions wherein the gear bracket and belt have been removed, then the pulley gear as well as the gear, etc. constituting the gear unit can possibly be separated to pieces. In such a case, assemble these parts by referring to the assembly and configuration diagram in Fig. 22.

Pully gear

Gear bracket

Belt

Motor pulley

J

Fig.19

Actuator motor

Pulley gear Belt Motor pulley

J

Pawl

u

Chassis assembly

v

Gear bracket

Fig.20

Assembly and Configuration Diagram

Pulley gear

w

Fig.21

Pulley gear

Gear B

Cylinder gear

Gear B

Gear C

Select gear

Gross gear L

Fig.22

Gross gear U

Gear C

1-17

MX-J270V

Removing the cams R1/R2 assembly and cam gear r (See Fig.23)

Remove the slit washer fixing the cams R1 and R2

1. assembly. By removing the two pawls "x" fixing the cam R1,

2. separate R2 from R1. Remove the slit washer fixing the cam gear r.

3. Pull out the cam gear r from the C.G. base assembly.

4.

Slit washer

Cam gear r

Removing the C.G. base assembly (See Fig.23 and 24)

Remove the three screws K retaining the C.G. base assembly.

[Caution]

To retassemble the cylinder gear, etc.with the cam unit (cam gear and cans R1/R2 assembly), gear unit and drive unit, align the position of the pawl "s" on the drive unit to that o f the notch on the cam gear r. Then, make sure that the gear unit is engaged by turning the cam gear r (See Fig. 24).

K

Slit washer Cam R2

Pawl

Cam R1

x

Cam switch board

C.G. base assembly

Pawl

x

Notch

Pawl

s

Cylinder gear

Drive unit

Fig.23

Cam gear r

Cam R1, R2 assembly

Gear unit

Gear bracket

Fig.24

1-18

MX-J270V

< Cassette mechanism section >

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 the flywheel R in counterclockwise direction until the head mount has gone out with a click (See Fig. 1).

2. When the flywheel R is rotated in counterclockwise direction, the playback head will be turned in counterclockwise direction from the position in Fig.2 to that in Fig.3.

3. At this position, disconnect the flexible P.C.board (outgoing from the playback head) from the connector CN301 on the head amp. and mechanism control P.C. board.

4. After dismounting the FPC holder,remove the flexible P.C.board.

5. Remove the flexible P.C.board from the chassis base.

6. Remove the spring "a" from behind the playback head.

7. Loosen the reversing azimuth screw retaining the playback head.

8. Take out the playback head from the front of the head mount.

9. The recording and eraser heads should also be removed similarly according to Steps 1~8 above.

Reassembling the playback, recording and eraser heads (See Fig.2,3)

Cassette mechanism

Fig.1

Playback/Recording & eraser head

Flexible P.C.board

CN301

Head amplifier & mechanism control P.C. board

Fig.2

Flywheel R

Trigger armHead mount

(Mechanism A side)

Spring "a"

Trigger arm

Flywheel R

(Mechanism A side)

1. Reassemble the playback head from the front of the head mount to the position as shown in Fig.3.

2. Fix the reversing azimuth screw.

3. Set the spring a from behind the playback head.

4. Attach the flexible P.C.board to the chassis base, and fix it with the FPC holder as shown in Fig.3.

5. The recording and eraser heads should also be reassembled similarly according to Steps 1~4 above.

Playback head

Spring "a"

FPC holder

Fig.3

Reversing azimuth screw

Head mount

Flexible P.C.board

CN302

Head amplifier & mechanism control P.C. board

(Mechanism B side)

1-19

MX-J270V

Removing the head amp.and mechanism control P.C.board (See Fig. 4)

1.Remove the cassette mechanism assembly.

2.After turning over the cassette mechanism assembly, remove the five screws "A" retaining the head amp. and mechanism control P.C. board

3.Disconnect the connectors CN303 and CN304 on the P.C.Board and the connectors CN1 on both the right and left side reel pulse P.C.Boards.

4.When necessary, remove the 4pin parallel wire soldered to the main motor

Removing the capstan motor assembly

1.Remove the six screws "B" retaining capstan motor assembly (See Fig. 5).

2.While raising the capstan motor, remove the capstan belts A and B respectively from the motor pulley (See Fig. 6).

A

Flexible board

Head amplifier & mechanism control board

AA

CN304

CN302 CN301

Flexible board

CN303

Fig.4

BB

Capstan motor assembly

AA

Caution 1: Be sure to handle the capstan belts so carefully that these belts will not be stained by grease and other foreign matter. Moreover, these belts should be hand while referring to the capstan belt hanging method.

Capstan belt A

BBBB

Fig.5

Capstan motor

Capstan belt B

1-20

Capstan belt A

Capstan belt B

Motor pulley

Fig.7 Fig.6

MX-J270V

Removing the capstan motor (See Fig. 8)

From the joint bracket, remove the two screws "C" retaining the capstan motor.

Removing the flywheel (See Fig. 9,10)

1.Remove the head amp. and mechanism control P.C.Board.

2.Remove the capstan motor assembly.

3.After turning over the cassette mechanism, remove the slit washers "a" and "b" fixing the capstan shafts R and L, and pull out the flywheels R and L respectively from behind the cassette mechanism.

Removing the reel pulse P.C.board and solenoid

(See Fig. 11)

1.Remove the five pawls (c,d,e,f,g) retaining the reel pulse P.C.Board.

2.From the surface of the reel pulse P.C.Board parts, remove the two pawls "h" and "i" retaining the solenoid.

Capstan motor

Joint bracket

Flywheel R Flywheel L

Slit washer "a"

Slit washer "b"

Reel pulse board

Solenoid

C

a

b

c

d

e

f

g

hi

Fig.8

Fig.9

Fig.11

Fig.10

1-21

MX-J270V

Adjustment method

Measuring devices necessary for adjustment

1. Low-frequency oscillator It must have the ability to output 600ohm from 0 dBs at an oscillation frequency of 20 Hz - 50 Hz.

2. Attenuator impedance: 600ohm

3. Electronic voltmeter

4. Distortion meter

5. Frequency counter

6. Wow and flutter meter

7. Test tapes VT-712: tape speed and rotational distortion (3 kHz) VT-724: standard level (1 kHz) VT-703: head angle adjustment (10 kHz), or use VT-73 VT-739: reproduction of frequency characteristics (1 kHz, 63 Hz, 10 kHz)

Tuner section

Voltage input to the tuner ..................... +B: DC 5.7 V

VT: DC 12 V Standard measuring output ..26.1 mV (0.28 V) /3ohm

Input locations ................ AM: standard loop antenna

FM: TP1 (hot) and TP2 (GND)

Standard settings for measuring volume

Sound ................................................................. OFF

Effective hyper bass ........................................... OFF

Volume adjustment ...................................... VOL. 23

Precautions for measuring

1. Input 30 pF and 33 kohm to the IF sweeper output and 0.082 F and 100 kohm to the sweeper input, respectively.

2. Lower the output level of the IF sweeper as much as possible in the adjustable range.

8. Blank tape Type I : AC-225 (TDK-AD) Type II : AC-514 (TDK-SA)

9. Torque gauge: Tension gauge for playback,

fast-forward and rewind. FWD (TW211A), REW (TW212A) and FF/REW (TW2231A)

Specifications for measurement

Power supply voltage .......AC 110 to 240 V (50/60 Hz)

Standard output .....................Speaker: 0.775 V/6ohm

Headphone:0.245V/32ohm Standard frequency and input level

................ 1 kHz: AUX: -8 dBs

Input level for reproduction of recording characteristics

................... AUX: -28 dBs

Measuring output terminal ................. Speaker: JA303

Load resistance .................................................. 6ohm

Radio input signal

AM frequency ................................................... 400 Hz

Degree of modulation in AM band ....................... 30%

FM frequency ................................................... 400 Hz

Frequency deviation in FM band ................... 22.5 kHz

3. The IF sweeper needs no adjustment as it is a fixed component.

4. It is not necessary to perform any kind of adjustment on the MPX, as a ceramic oscillator is used for measuring.

5. FM tracking adjustment is not necessary as a fixed coil is used.

6. The grounding circuit is separate from the input and output. Therefore, be sure to connect to ground carefully when measuring both the input and output voltages simultaneously using 2 channels of the electronic voltmeter.

7. The speaker's minus terminal cannot be connected to ground when using a BTL format amplifier. Therefore, do not connect any type of ground wire to this terminal. The OTL format is used with this system.

8. Use a large wire to connect to the dummy impedance generator when measuring the output.

9. Be sure to use a band pass filter (DV-12) when using mixed tape.

1-22

Arrangement of Adjusting Positions

MX-J270V

Cassette mechanism section (Mechanism A section)

Head azimuth

adjusting screw

(Forward side)

Playback

head

Head azimuth

adjusting screw

(Reverse side)

Cassette mechanism section (Back side)

Head azimuth

adjusting screw

(Forward side)

Playback,recording and eraser

heads or playback head

Head azimuth

adjusting screw

(Reverse side)

Cassette Mechanism Unit Section

Head amplifier mechanism control board

Tape speed ADJ

Bias ADJ L

Bias ADJ R

1-23

MX-J270V

Tape Recorder Section

Items Measurement

Confirmation of head angle

conditions

Test tape :VT703(10kHz) Measurement output terminal :Speaker terminal Speaker R (Load resistor:3ohm) :Headphone terminal

Measurement method

1.Playback the test tape VT703(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.

Standard

values

Maximum output

Adjusting

positions

Adjust the head azimuth screw only when the head has been changed.

Confirmation of tape speed

Test tape :VT712(3kHz) Measurement output terminal :Headphone terminal

<Constant speed> 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.

Reference Values for Confirmation items

Items Measurement

Double tape speed

Difference between the forward and reverse speed. P.mecha and R/P mecha speed

conditions

Test tape :VT712(3kHz) Measurement output terminal :Speaker terminal Speaker R (Load resistance :3ohm) measurement output terminal :Headphone terminal

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.

Measurement method

Tape speed of decks (A and B) :3,000Hz 60Hz

Standard

values

4,800+400/

-300Hz

60Hz or less

VR301

Adjusting

positions

Playback mechanism side

Both the playback and recording & playback mechanism

Wow & flutter

1-24

Test tape :VT712(3kHz) Measurement output terminal :Headphone terminal

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).

with in

0.25% JIS(WTD)

Both the playback and recording & playback mechanism

Electrical Performance

Items Measurement

Adjustment of recording bias current (Reference value)

conditions *Mode : Forward or reverse mode *Recording mode *Test tape :AC-514 and AC-225 Measurement output terminal :Both recording and headphone terminals

Measurement method

1.With the recording and playback mechanism, load the test tapes(AC-514 to TYP and AC-225 to TYP ),and set the mechanism to the recording and pausing conditions in advance.

2.After connecting 100ohm 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 ) and 4.20 A(TYP ).

Standard

values AC-225 :4.20 A AC-514 :4.0 A

MX-J270V

Adjusting

positions

LcH :VR101 RcH :VR201

Adjustment of recording and playback frequency characteristics

Reference frequency :1kHz and 10kHz (REF:-20dB) Test tape :TYP AC-514 Measurement input terminal :OSC IN

1.With the recording and playback mechanism,load the test tape(AC-514 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.

Reference Values for Electrical Function Confirmation Items

Items Measurement

Recording bias frequency

conditions

*Recording and playback side forward or reverse *Test tape :TYP AC-514 *Measurement terminal BIAS TP on P.C.board

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-514 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.

Measurement method

Output deviation between 1kHz and 10kH :-1dB 2dB

Standard

values 100kHz +9kHz

-7kHz

LcH :VR101 RcH :VR201

Adjusting

positions

Eraser current (Reference value)

*Recording and playback side forward or reverse *Recording mode *Test tape :AC-514 and AC-225 Measurement terminal Both of the eraser head

1.With the recording and playback mechanism, load the test tapes(AC-514 to TYP and AC-225 to TYP ),and set the mechanism to the recording and pausing condition in advance.

2.After setting to the recording conditions,connect 1Mohm in series to the eraser head on the recording and playback mechanism side,and measure the eraser current from both of the eraser terminal.

TYP :120mA TYP :75mA

1-25

MX-J270V

Flow of functional operation until TOC read

Power ON

Power Key

Slider turns REST SW ON.

Automatic tuning of TE offset

Check Point

Check that the voltage at the pin 5 of CN602 is 0V (a moment)?

VREF

Tracking error waveform at TOC reading

pin 25 of IC601(TE)

Approx

1.8V

Tracking servo

Disc statas to rotate

off statas

Automatic measurement of TE amplitude and automatic tuning of TE balance

Approx.3sec

Tracking servo on statas

Disc to be braked to stop

TOC reading finishes

500mv/div 2ms/div

Fig.1

Laser ON

Detection of disc

Automatic tuning of Foucus offset

Automatic measurement of Focus A-curve amplitude

Disc is rotated

Focus servo ON (Tracking servo ON)

Automatic measurement of Tracking error amplitude

Automatic tuning of Tracking error balance

Check that the voltage at the pin3 of IC601 + side is + 5V?

Confirm that the Focus error S-cuve siganl at the pin27 of IC601 is approx.2Vp-p

Confirm that the siganl from pin24 IC603 is 0V as a accelerated pulse during approx.400ms.

Confirm the waveform of the Tracking error signal at the pin25 of IC601 (R612) (See fig-1)

1-26

Automatic tuning of Focus error balance

Automatic tuning of Focus error gain

Automatic tuning of Tracking error gain

TOC reading

Play a disc

Confirm the eys-pattern at the lead of TP602

MX-J270V

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 (Fig.1) When the life of the laser diode has expired, the following symptoms wil appear. (1) The level of RF output (EFM output:ampli tude of eye pattern) will below.

Is RF output

1.1 0.15Vp-p?

YES

O.K

NO

Replace it.

Replacement of laser pickup

Turn off the power switch and,disconnect 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 laser beam directly.

Play a disc.

(Fig.1)

(3) Semi-fixed resistor on the APC PC board The semi-fixed resistor on the APC printed circuit board which is attached to 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 be replaced. If the semi-fixed resistor is adjusted while the pickup is functioning normally,the laser pickup may be damaged due to excessive current.

Check the eye-pattern at TP1.

Finish.

1-27

MX-J270V

Description of major ICs

AN8806SB (IC601) : RF&Servo AMP

1.Pin layout

PD

LD LDON LDP VCC RF- RF OUT RF IN

C.AGC ARF C.ENV

C.EA

CS BDO

BDO CS BRT OFTR

/RFDET

GND

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16 17 18

36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19

PDAC PDBD PDF PDE PDER PDFR TBAL FBAL FE FE OUT TE TE OUT CROSS TE BPF VDET LD OFF VREF ENV

2.Block diagram

36

--

+

35

-+

31

34

-+

32

33

-+

6

--

VCBA

+

29

728

-+

--

+

VCBA

--

+

VCBA

--

VCBA

+

--

-+

+

--

27

-+

--

EQ

+

--

+

--

910 17

8

AGC

OFTR

BDO

RF DET

11

12 19

ENV CURCUIT

13

14

15 16

-+

20

21

2

1-28

24 25

30

23

26

22

14

3

35 36

34

33

32

31

30

29

28

27

26

25

24

23

22

21

20

19

18

17

16

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

3. Pin function

PD AC

FBAL TBAL

PDFR PDER

PDE PDF

PD BD

TE BPF

VDET

CROSS TE OUT

TE-

FE OUT

FE-

/RFDET

GND

LD OFF

VREF

ENV

OFTR

C.AGC

ARF

C.ENV

C.EA

CS BDO

BDO

CS BRT

LD

LD ON

LDP

VCC

RF-

RF OUT

RF IN

PD

Pin No.

Symbol

I/O

I

O

I

--

-I

O

I

I/O

O I/O I/O

I/O

O I/O

O O

-O O

-O

I O O

I O

I

I/O I/O

I

I I-V amp input

I-V amp input I-V amp input

I-V amp input

E I-V amp gain control

F I-V amp gain control

Tracking balance control

Focus balance control

Inverse input pin for focus error amp

Output pin of focus error

Inverse input pin for tracking error amp

Tracking error signal output

Tracking error cross output

Input pin of tracking error through BPF

Vibration detection signal output

Connect to ground

Reference voltage output

Description

APC amp input terminal APC amp output terminal

APC ON/OFF control terminal

Envelope output

Ground

RF detection signal output

Of-track status signal output

BDO output pin

A capacitor is connected to this terminal to detect the envelope of RF signal

RF output

Connecting pin of AGC loop filter

RF input

RFamp output

Inverse input pin for RF amp

Power supply

Connect to ground

A capacitor is connected to this terminal to detect the envelope of RF signal

A capacitor is connected to detect the lower envelope of RF signal

MX-J270V

1-29

MX-J270V

BA15218F (IC852) : OP AMP.

1OUT1

2-IN1

-

8

7

CC

V

OUT2

1

3+IN1

+

-

-IN2

6

2

4

+

+IN2

5GND

BA15218N (IC301,303,305,307) : Dual Ope. Amp.

+

1

-

1 2 3 4 5 6 7 8

OUT1 +IN1 +IN1

+IN2 -IN2 OUT2

GND

2

-

Vcc

TA8409S (IC851,852) : Motor driver

1.Pin layout 2.Pin function

1

IN2

VCC

OUT 2

NC

GND

VS

OUT 1

VREF

IN1

2 3 4 5 6 7 8 9

TA8409S

INPUT OUTPUT MODE

IN1

IN2

0

1

0

1

TC7SH04FU (IC108) : CMOS Inverter

NC

IN A

1

2

5

VCC

OUT1

H

L L

OUT2

L

H

L

MOTOR

STOP CW/CCW CCW/CW

BRAKE

1-30

GND

3

4

OUT Y

BA6897FP (IC801) : 4channel driver

MX-J270V

CH1-OUTA

CH1-OUTB

CH1-INA

CH1-INB

TEST1

TEST2

MUTE

GND

CH2-INB

CH2-INA

CH2-OUTB

CH2-OUTA

GND

D.BUF

1

2

D.BUF

3

4

5

6

7

8

9

10

D.BUF

11

12

D.BUF

13

- +

Level

shift

Level shift

- +

+ Level shift

T.S.D

DRIVER

MUTE

+-

-+

Level shift + -

-+

+-

D.BUF

-+

D.BUF

28

27

26

25

24

23

22

21

20

19

18

17

16

GND

CH4-OUTA

CH4-OUTB

CH4-INA

CH4-INB

BIAS IN

Vcc

CH3-INB

CH3-INA

CH3-OUTB

CH3-OUTA

OP IN(+)

OP-OUT

14

-+

15

OP IN(-)

1-31

MX-J270V

BH3854 (IC306) : E.Volume

1.Terminal layout

2.Block diagram

IN2

RIP

32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17

NF2

32 17

116

TC

BVN2

BIN2

BVO2

2K

TIN2

TVO2

OUT2

10K

VC

10K

BC

CLK

DATA

LATCH

VREF

( BASS ) (TREBLE)

TONE CONTROL

20K

Vcc

20K

47K

20K

VOLUME

MATRIX SURROUND SOUND

VOLUME

3.8V

CONTROL

Ref.Voltage

VOLUME

TONE CONTROL

( BASS )

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

IN1

A-GND

NF1

BVN1

BIN1

(TREBLE)

20K

BV01

TIN1

TVO1

Vcc

OUT1

Vcc

200K

SC

PORT1

PORT2

PORT3

PORT4

VSS

1-32

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. Impedance of VC, TC and BC terminals is 10 K (Typ.). Impedance of SC terminal is 200K (Typ.).

MX-J270V

PIN PIN Name Function PIN PIN Name Function

1 2 3 4 5 6 7 8

9 10 11

12 13 14 15 16

A-GND IN1 NF1 BVN1 BIN1 BV01 TIN1 TV01 OUT1 Vcc SC

PORT1 PORT2 PORT3 PORT4 VSS

Analog system ground Terminal for 1ch volume

input Terminal for gain adjustment of input step AMP Terminal for connection of 1ch low-frequency filter Terminal for connection of 1ch low-frequency filter Terminal for connection of 1ch low-frequency filter Terminal for connection of 1ch high-frequency filter Terminal for connection of 1ch high-frequency filter Terminal for 1ch volume output Terminal for power supply

Terminal for time constant attachment for switching shock protection

Terminal for port output Terminal for port output Terminal for port output Terminal for port output Digital system ground

17 18 19 20 21

22

23

24 25 26 27 28 29 30 31 32

VREF LATCH DATA CLK BC

TC

VC

OUT2 TV02 TIN2 BV02 BIN2 BVN2 NF2 IN2 RIP

Terminal for 3.8V reference voltage output Terminal to receive latch data

Terminal to receive data Terminal to receive clock Terminal for time constant

attachment for switching shock protection

Terminal for time constant attachment for switching shock protection

Terminal for 2ch volume output Terminal for connection of 2ch high-frequency filter Terminal for connection of 2ch high-frequency filter Terminal for connection of 2ch low-frequency filter Terminal for connection of 2ch low-frequency filter Terminal for connection of 2ch low-frequency filter Terminal for gain adjustment of input step AMP Terminal for 2ch volume output Terminal for filter

BH3854

3. Pin function

1-33

MX-J270V

BU2173F (IC105) : VCO

1.Terminal Layout 2.Block diagrams

VDD TSTO XTALI

XTALO CTRLA CTRLB CTRLC

TSTI

VSS

1 2 3 4 5 6 7 8 9

18 17 16 15 14 13 12 11 10

3.Pin function

Pin No.

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16 17 18

AVDD FPUT4 VDDIO FOUT1 TEST FOUT2 VSSIO FOUT3 AVSS

Symbol I/O Function

VDD TSTO XTALI

XTALO CTRLA CTRLB CTRLC

TSTI

VSS

AVSS

FOUT3

VSSIO

FOUT2

TEST FOUT1 VDDIO FOUT4

AVDD

-

Digital VDD . Use open this pin for normal operation.

I

Reference oscillation input.

O

Reference oscillation output. Frequency select for V-CD/CD-G. Force H for normal operation. PAL/NTSC select for CD-G mode. Force L for normal operation.

-

Digital GND.

-

Analog GND. Use open this pin for normal operation.

-

I/O GND.

O

Clock output (2). Force L for normal operation.

O

Clock output (1).

-

I/O VDD .

O

Clock output (4).

-

Analog VDD .

1-34

1 2 3 4 5 6 7

8,9

10

11 15

16 17 18 19 20 21 22

23 28

29 30,31 32,33

34 37

38

39 42

43

44

45

46

47

48

49

50 51,52

53 57

58

59 63

64

65

66 72

73

74 76

77

78 80

81

82 84

85

86 89

90

91 94

95

96 97 98

99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122

123 124 125 126 127 128

HA2

DS

W/R

IRQ

DTACK

HD0

IO VDD

HD1,2

CKT VSS

HD3 7

IOVSS

TEST

XTLVSS

XTLIN XTLOUT XTLVDD

CKTVDD

MD0 5

IOVDD

MD6,7

MCE01

MD8 11

IOVSS

MD12 15

5VVDD

LCAS

LCASIN

CKTVSS

MWE

UCAS

IOVDD

UCASIN

RAS0,1 MA9 5

IOVSS

MA4 0

PIO0 IOVDD VD0 6

IOVSS

VD7 9

CKTVDD

VD10 12

IOVDD

VD13 15

CKTVSS

VD16 19

IOVSS

VD20 23

VSYNC

HSYNC

VOE

VCOVDD

VCLK

VCOVSS

RESET

IOVSS

C2PO

CDLRCK

CDDATA

CDBCK

DALRCK

DADAT A

DABCK

IOVDD

XCK

CKTVDD

PIO12 PIO11 PIO10

PIO9 PIO8 PIO7 PIO6 PIO5 PIO4 PIO3

5VVDD

PIO2

IOVSS

PIO1

HA0 HA1

Host address. Data strobe terminal. I/O read terminal. Interact terminal. Acknowledge data output. Host data terminal. Power supply for input/output. Host data terminal. Connected to GND. Date data terminal. Ground terminal for Input/Output. Test terminal. Oscillator ground terminal. Oscillator input terminal. Oscillator output terminal. Power supply for oscillator. Power supply. DRAM data / ROM data terminal. Power supply for Input/Output. DRAM data/ROM data terminal. Chip enable output for ROM bank. DRAM data/ROM data terminal. Ground terminal for Input/Output. DRAM data/ROM address terminal. Power supply (+5V). DRAM LCAS/ROM address terminal. DRAM LCAS input. Connect to GND. DRAM write enable signal output. DRAM UCAS/ROM address terminal. Power supply for Input/Output. DRAM UCAS input terminal. DRAM RAS0,1 terminal. DRAM data/ROM address terminal. Ground terminal for Input/Output. DRAM data/ROM address terminal. ROM address extension terminal. Power supply for Input/output. Video data terminal (R6/CrCb6/YCrCb066) Ground terminal for Input/Output. Video data terminal (R7/CrCb7/YCrCb7)(G0,1/Y0,1) Power supply.

Video data terminal (G24/Y24) Power supply for Input/Output. Video data terminal (G57/Y57) Connect to GND. Video data terminal(B0B3) Ground terminal for Input/Output. Video data terminal(B47) Vertical comparator/Composite comparator output. Horizontal synchronizing signal. Video output enable signal. Power supply of VCO. Video clock terminal. Ground of VCO. Reset signal input. Ground terminal for Input/Output. Data error flag input. L/R word clock input. Bit serial data input. Bit clock output. L/R clock output. Bit serial PCM audio signal output. Bit clock output. Power supply for Input/Output. Bit clock input terminal. Power supply. Interact 2 signal output. Non connect. Host enable signal input. Boot ROM enable signal input. Non connect. DAC emphasis signal output. CD-DA emphasis signal output. Non connect. FMV detect signal output. CD-DA video CD select signal output Low:Video CD. Power supply (+5V). Non connect. Ground for Input/Output. Non connect. Host address input. Host address input.

I I

I O O

I/O

-

I/O

-

I/O

-

I

I O

-

I/O

-

I/O

O

I/O

-

I/O

-

O

I

O O

-

O O

O

-

O

-

O

-

O

-

O

I/O

I

-

I/O

I

I I I

I O O O

-

I

O O

I

I O O

I O O O

-

O

-

O

-

Pin No.

Symbol

I/O

Function

Pin No.

Symbol

I/O

Function

CL480-F1 (IC101) : MPEG-1 Audio / Video decoder

MX-J270V

1-35

MX-J270V

HD74HCT244 (IC113) : Buffer

1. Terminal la yout

2. Block diagram

1-36

1. Pin layout

1 2 3 4 5 6 7 8 9 10 11

22 21 20 19 18 17 16 15 14 13 12

XT

FM/AM

CE

DI

CLOCK

DO

FM/ST/VCO

AM/FM

SDIN

XT GND LPFIN LPFOUT PD VCC FMIN AMIN

IFCONT IFIN

Pin No.

1 2 3

4

5 6

7

8 9 10 11

Pin No.

12 13 14

15

16 17

18

19 20 21 22

Symbol

XT

FM/AM

CE

DI

CLOCK

DO

FM/ST/VCO

AM/FM

LW

MW

SDIN

Symbol

IFIN

IFCONT

AMIN

FMIN

VCC

PD

LPFOUT

LPFIN

GND

XT

Function X'tal oscillator connect (75kHz) LOW:FM mode When data output/input for 4pin(input) and 6pin(output): H Input for receive the serial data from controller Sync signal input use Data output for Controller Output port "Low": MW mode

Open state after the power on reset Input/output port Input/output port Data input/output

Function IF counter signal input

IF signal output Not use

AM Local OSC signal output

FM Local OSC signal input Power suplly(VDD=4.5-5.5V) When power ON:Reset circuit move PLL charge pump output(H: Local OSC frequency Height than Reference frequency. L: Low Agreement: Height impedance) Output for active lowpassfilter of PLL Input for active lowpassfilter of PLL Connected to GND X'tal oscillator(75KHz)

I/O

I

O

I

O

O I/O I/O I/O

I/O

I

O

-

I

-

O

I

Reference

Driver

Phase

Detector

Charge Pump

Unlock

Detector

Universal

Counter

Swallow Counter

1/16,1/17 4bit

12bit

Programmable

DriverS

Swallow Counter

1/16,1/17 4bit

Data Shift Register & Latch

Power

on

Reset

C

2B

I/F

1/2

782

11

13

21

17

6

5

4

3

15

16

22

1

18 19

20

12

2. Block diagram

3. Pin function

LC72136 (IC2) : PLL Frequency Synthesizer

MX-J270V

1-37

MX-J270V

LH531HEG (IC102) : 1M ROM

1.Terminal Layout

VPP

A16 A15 A12

A7 A6 A5 A4 A3 A2 A1 A0 D0 D1 D2

GND

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16

32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17

VCC

A18 A17 A14 A13

A8 A9

A11

CE

A10

CE

D7 D6 D5 D4 D3

2.Block diagram

2

A16

3

A15

29

A14

28

A13

4

A12

25

A11

23

A10

26

A9

27

A8

5

A7

6

A6

7

A5

8

A4

9

A3

10

A2

11

A1

12

A0

22

CE

BUFFER

ADDRESS/BUFFER

CE

ADDRESS/DECODER

TIMING

GENERATOR

MEMORY

MATRIX

(131,072 8bit)

CORAM

SELECTOR

SENS AMP.

3.Pin Function Pin No.

1 2 3 4

5 12

13 15

16

17 21

22 23 24

25 26,27 28,29 30,31

A13,A14

D17,D18

32

Symbol

VPP

A16 A15

A12 A7A0 D0D2

GND

D3D7

CE

A10

CE

A11

A9,A8

VCC

I/O

I I I I

O

-

O

I I I I I I

O

-

OE

BUFFER

24

CE

Function Power supply. Adress input. Adress input. Adress input. Adress input. Data output. Connect to GND Data output. Chip enable input. Adress input. Chip enable input. Adress input. Adress input. Adress input. Data output. Power supply.

BUFFER OUTPUT

32

16

GNDVCC

13 141517 18 19 20 21

D0 D1 D2 D3 D4 D5 D6 D7

1-38

MN171601AK8J2 (IC111) : HOST Micro Computer

1.Terminal Layout 64 49

MX-J270V

1

16

17 32

2.Pin Function Pin No.

1 2 3 4 5 6 7 8

9 10 11 12

13 15

16

17 24 25 39

40

41 48

49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64

Symbol

480RST

MREQ

ACTINT

GDET

GND

DTACK

GND GND

DIR

N/PAL

RGB

W/R

HA02

DS

HD07

SA014

SCS SD18 SR/W

PAL60

RESET

X1 X2

VSS

OSC2 OSC1

VDD

HREQ SRCLK M2HDT

M2MDT

HRDY

VCD/G

PALCDG

48

33

I/O Function O

I/O

O

I/O

O O

I/O

O

O I/O I/O

O

Reset signal output. Input the transfer request data signal.

I

Interact 2 signal input.

I

CD-G detect terminal H:CD-G

I

Connected to GND.

Acknowledge signal input.

I

Connect to GND.

Input/Output control for IC114.

Not use.

Video out control signal (H:RGB L:composite)

Read/Write signal input/output. Address signal output for MPEG LSI. Data strobe signal output. Data terminal for MPEG LSI. SRAM address signal output. SRAM chip select signal output. SRAM data Input/Output terminal. SRAM read/write signal input/output. Not use.

Reset signal input.

I

Non connect

Non connect.

Connect to GND.

Non connect.

Clock input terminal.

I

Power supply.

Communication signal output.

Clock signal for data request. Serial data output. Serial data input.

I

Communication signal output. Video swith switching signal output. CD-G PAL/NTSC clock select terminal.

1-39

MX-J270V

MN35510 (IC651) : Digital servo & digital signal processor

1. Terminal Layout

2.Block Diagram

LRCKIN(MSEL) BCLK(SSEL) SRDATAIN (PSEL)

IOSEL

CLVS CRC BLKCK CLDCK SBCK SUBC DEMPH RESY FLAG6(RESY)

SSEL SQCK SUBQ AVDD2

AVDD2

PCK EFM PLLF DSLF IREF DRF ARF RSEL PSEL

MLD MCLK MDATA

CK384(EFM) VCOF BYTCK SMCK FCLK CSEL MSEL X2 X1

ÊSTAT

DIGITAL DEEMPHSIS

SUB CODE BUFFER

DSL. PLL VCO

VCO

ITUNING GENERATION PITCH CONTROL

20 ~ 1

21

~

40

41 ~ 60

8TIMES OVER SAMPUNC DIGITAL FILTER

EFM DEMODULATION

SYNC INTERPOLATION

SUBCODE DEMODULATION

MICRO COMPUTER INTERFACE

CONVERTER

A/D

80

~

61

CIRC ERROR CORRECTION DEINTERLEVE

CLV SERVO

1BIT DAC LOGIC S

16k SRAM

INPUT

PEM (R)

PEM (L)

D/A CONVERTER

OUTPUT

DIGITAL AUDIO INTERFASE

INTER POLATION SOFT MUTING DIGITAL ATTENUATION PEAK DETECTIVE AUTO CUE

PORT

SERVO TIMING GENERATOR

AVSS1 AVDD1 OUTR

OUTL

FLAG IPFLAG

TX

ECM

PC

LRCK SRDATA BCLK DMUTE

TRKV KICK VREF TRVSTR ECS TVD TRD FOD TBAL FBAL TOFS TES /TLOCK /FLOCK PLAY LDON WVEL SENSE

1-40

D

/

D

V

S

D

S

D

D 1

/

R

V

T

S

E

T

S

1

T

F E

R

T

F

E

E N V

T R C R S

B

V

D

O

E T

/ R F D E

O F T

3. Description

Pin No.

symbol

I/O

O O O

1 2 3 4 5 6

7

8

9 10 11

12 13

14

15

16

17

18 19 20 21 22 23

24

25

26

27

28

29

30 31 32 33

34 35

36

37 38

39 40

Pin No.

symbol

I/O

42

41

43 44 45 46

47

48 49 50 51

52 53 54 55

56

57

58 59 60 61 62

63 64

65 66

67

68

69

70 71 72

73

74

75

76

77

78

79

80

O

I

I I I

O

BCLK LRCK SRDATA DVDD1 DVSS1 TX

MCLK

MDATA MLD

I

I SENSE FLOCK TLOCK BLKCK SQCK

O

I

SUBQ DMUTE

STATUS

I

O O

RST SMCK

PMCK

TRV TVD

PC

ECM

ECS

KICK

TRD

O

O O

O

I

FOD

VREF

FBAL

TBAL

FE

TE

I

RF ENV

VDET OFT TRCRS

I

O

RFDET

BDO LDON

Description

Not used

Connected to GND Digital audio interface output

Power supply (Digital)

Micom command clock signal input

Micom command load signal input

Micom command data input

Focus lock signal output Active :Low

Sence signal output

(Data is latched at signal's rising point)

Tracking lock signal output Active :Low

sub-code - block - clock signal output Outside clock for sub-code Q resister input Sub-code Q -code output Connected to GND

Status signal (CRC,CUE,CLVS,TTSTOP,ECLV,SQOK)

Reset signal input (L:Reset)

Not used

Traverse enforced output

Traverse drive output

Not used

Spindle motor drive signal (Enforced

mode output) 3-State Spindle motor drive signal (Servo error

signal output)

Kick pulse output Tracking drive output

Focus drive output

Reference voltage input pin for D/A

output block (TVD,FOD,FBA,TBAL)

Focus Balance adjust signal output

Tracking Balance adjust signal output

Focus error signal input(Analog input) Tracking error signal input(Analog input) RF envelope signal input(Analog input)

Vibration detect signal input(H:detect)

Off track signal input(H:off track)

Track cross signal input

RF detect signal input(L:detect)

BDO input pin(L:detect)

Laser ON signal output(H:on)

I I I

I/O

I

III

I

Description

Not used Not used

TES PLAY

WVEL ARF IREF DRF

DSLF

PLLF

Tracking error shunt signal output(H:shunt)

RF signal input Reference current input pin Bias pin for DSL

Not used

Loop filter pin for DSL Loop filter pin for PLL

Power supply(Analog)

Connected to GND(Analog)

Not used

I

Connected to GND(for X'tal oscillation circuit)

I

O

I

O

I

III

I

II

I

I I

Not used Not used Not used

Not used

Not used Not used

Not used

Pull up

Connected to GND

Connected to GND Connected to GND

pull up

pull up pull up

Power supply(Digital)

Lch audio output

Connected to GND Rch audio output

Power supply(for X'tal cscillation circuit)

Input of 16.9344MHz X'tal oscillation circuit

Output of X'tal oscillation circuit

VCOF AVDD2

AVSS2

EFM

PCK PDO

SUBC SBCK

VSS

XI X2

VDD

BYTCK CLDCK

FLAG

IPPLAG

FLAG

CLVS

CRC

DEMPH

RESY

IOSEL

TEST

AVDD1

OUT L

AVSS1

OUT R

RSEL

SSEL

MSEL

PSEL

CSEL

MX-J270V

1-41

MX-J270V

TA2057N (IC1) : FM/AM IF AMP & Detector

1.Block Diagrams

FM IF IN

24 23 22 21 20 19 18 17 16 15 14 13

AM MIX OUT Vstb QUAD FM OUT AM OUT MPX IN LPF 1 LPF 2 VCO L OUT

REG

FM IF

AM IF IN

FM DET

AM

VCO

DIVIDE

DECODE

MUTE

AM MIX

123456789 1110 12

AM RF IN

2.Pin Function

Pin No.

I/O

1

I 2 3 4 5 6 7 8 9

10 11

12

AM S.SENS FM S.SENS

AM OSC OUT

O

-

I

-

O O O

O

S.SENSFMS.SENS

Symbol AM RF

AM OSC

VCC AGC

GND IF OUT TU IND ST IND

Rch OUT

AMRF signal input

AM local oscillation circuit AM local oscillation signal output Power supply AGC voltage input terminal Connect to GND IF REQ signal output to IC2 Indicator drive output when tuning Stereo indicator output "H"mono . "L"stereo Output Rch

I/O

O O O

O

I O O

FM QUAD

I

AM MIX OUT

O

I

LEVEL SW

IF BUFF

IF REQ SW

Symbol

Lch OUT

VCO

LPF2

LPF1

MPX IN AM OUT FM OUT

AM IF IN

Vst

FM IF IN

TUN LED

/REQ

Output Lch Voltage controlled terminal When voltage of terminal is MONO at "H" and ST at "L" When voltage of terminal is AM at "H" and FM at "L" Multi plex signal input AM detection signal output FM detection signal output Bypass to FMIF Input of AMIF signal Fixed voltage output terminal Output terminal for AM mixer Input of FMIF signal

TUN LED

AM IF

AM OSC

AM OSCAMOSC

BUFF

OUT

Function Function

AM DET

AGC

Vcc AGC GND IF OUT

Pin No.

13 14 15

16

17 18 19 20 21 22 23 24

AM/FM MONO SW

ST LED

R OUTAM

1-42

TC9409BF (IC601) : KARAOKE DSP

MX-J270V

1-43

MX-J270V

TDA7295 (IC101, IC201) : Audio AMP

1. Pin arrangement chart

2. Block diagram

15 14 13 12 11 10

9 8 7 6 5 4 3 2 1

BOOTSTRAP

-Vp (POWER) OUT +Vp (POWER) N.C. N.C. MUTE STAND-BY

-Vs (SIGNAL) +Vs (SAIGNAL) BOOTSTRAP N.C. SUR NON INVERTING INPUT INVERTING INPUT STAND-BY GND

+Vs

IN+

IN-

BIPOLAR

TRANSCONDUCTANCE

INPUT STAGE

MOS GAIN &

LEVEL SHIFTING

STAGE

MOS OUTPUT STAGE

BOOTSTRAP

OUTPUT

-Vs

SHORT CIRCUIT

PROTECTION

1-44

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

No.20880

Printed in Japan 200011(V)