JVC MXJ-100 Service manual

SERVICE MANUAL

COMPACT COMPONENT SYSTEM

MX-J100

POWER

TIMER

SLEEP

ON/OFF

SOUND

ACTIVE

PROGRAM

REPEAT

MODE

BASS EX.

/SET

TAPEA/B

TUNING MODE FM MODE

TAPE

FM/AM AUX

DISC SKIP

VOL.

FADE

MUTING

VOL.

–

RM–SMXJ100J

REMOTE CONTROL

Contents

SP-MXJ100

COMPACT

DIGITAL AUDIO

CA-MXJ100

STANDBY

POWER

COUNTER

CLOCK/TIMER

RESET

DEMO

ACTIVE BASS EX. SOUND MODE

PROGRAM/SET

PHONES

REPEAT

COMPU

PLAY

CONTROL

FULL-LOGIC CONTROL

CD1CD2CD

PLAY & EXCHANGER

AUX FM/AM

CD TAPE

TUNING TUNING +

PRESET

–

PLAY REC/PLAY

CD SYNCHRO RECORDING

SP-MXJ100

OPEN / CLOSE

DISC CHANGE

COMPACT

DIGITAL AUDIO

VOLUME

–

CD REC START

TAPE A/B

REC/PAUSE

A B

DUBBING

EJECTEJECT

Area Suffix

J C

U.S.A.

Canada

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

1-2 1-3 1-4 1-5 1-19

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

1-23 1-24 1-24 1-25

No.20817

Jun. 2000

MX-J100

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 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 current 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 each exposed metal part, particularly any exposed metal part having a return path to the chassis, and measure 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-J100

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 laser

radiation and is equipped with safety switches which prevent 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.

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.

1-3

MX-J100

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 CD mechanism assembly is decomposed

*Please refer to "Disassembly method" in the text for pick-up and how to detach the CD mechanism assembly.

CD changer unit

1. Remove the CD changer unit.

2. Remove the CD changer mechanism.

3. Solder is put up before the card wire is removed from the pickup unit connector on the CD mechanism assembly. (When the card wire is removed without putting up solder, the CD pick-up assembly might destroy.)

4. Please remove solder after connecting the card wire with the pickup unit connector when you install picking up in the substrate.

1-4

Card wire

Picup unit connector

Soldering

Fig.2

Fig.1

CD changer mechanism

Card wire

Picup unit connector

MX-J100

Disassembly method

Removing the top cover and the side covers (See Fig.1 to 3)

Remove the three screws A on the back of the body and the two screws B on both sides of the body.

Remove the top cover upward from behind.

Remove the two screws C attaching the side covers on the back of the body and the six screws D on both sides.

Slide the right and left covers backward and unhook the two hooks a in the lower part of the side covers as shown in Fig.2-2.

Hook

Side cover(L)

Fig.1

Top cover

Side cover(R)

Hook

Side cover(R)

Hooks a

Fig.2Fig.2-2

Top cover

Hooks a

Fig.3

Side cover(L)

1-5

MX-J100

Removing the CD Tray fitting

(See Fig. 4 to 6)

Prior to performing the following procedure, remove the top cover and the side covers.

ATTENTION:

Be sure to remove the CD tray fitting before removing the CD changer unit.

Press the POWER button. Press the OPEN/CLOSE button to eject the CD tray.

Move the CD tray fitting upward and release the joint b.

Press the OPEN/CLOSE button to insert the tray.

Removing the CD Tray fitting

(See Fig. 5 to 7)

CD tray

OPEN/CLOSE button

POWER button

Fig.4

Joint b

CD tray fitting

- How to eject the CD tray without turning on power -

Turn the black loading pulley gear marked c from the back of the CD changer unit as shown in Fig.7 and draw the CD tray toward the front.

Move the CD tray fitting upward and release the joint b.

Push and insert the CD tray manually.

Joint b

Fig.5

CD tray

Marked c Loading pulley gear

1-6

This slot of the board.

Fig.7

Fig.6

MX-J100

Removing the CD changer unit

(See Fig.8 to 10)

Prior to performing the following procedure, remove the top cover, the side covers and the CD Tray fitting.

Disconnect the card wire from connector SCW1 of the CD servo board on the back of the CD changer unit.

Disconnect the harness from connector FW2 on the inner side of the mother(main) board in the body.

Remove the two screws E attaching the CD changer unit on the back of the body.

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

CD servo board

SCW1

Mother(main) board

Fig.8

CD changer unit

FW2

Rear panel

Front panel assembly

Fig.9

CD changer unit

Rear panel

Fig.10

1-7

MX-J100

Removing the front panel assembly

(See Fig.11 to 13)

Front panel assembly

Mother (main) board

Prior to performing the following procedure, remove the top cover, the side covers, the CD Tray fitting and the CD changer unit.

There is no need to remove the rear panel.

Disconnect the harness from head wire connector DW1 and DW2 on the inner side of the mother (main) board in the body.

Disconnect the harness from connector HCW1 of the headphone board on the right side of the body.

Remove the three screws F attaching the front panel assembly on both sides of the body. Remove the screw V attaching the earth terminal extending from the front compartment.

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

Release the two joints d on both sides and two joints e on the bottom of the body using a screwdriver. At the same time, disconnect the front compartment from connector CCW1 and CCW2 of the mother(main) board.

Joint d

earth wire

CCW1

CCW2

DW2

DW1

Fig.11

Front panel assembly

Headphone board

HCW1

Mother (main) board

Fig.12

Joint e

Fig.13

Joint d

Joint e

1-8

MX-J100

Prior to performing the following procedure, remove the top cover, the side covers, the CD Tray fitting and the CD changer unit.

There is no need to remove the front panel assembly.

Remove the seven screws H attaching the mother(main) board and the tuner board to the rear panel on the back of the body.

Remove the three screws I attaching the heat sink to the rear panel on the back of the body.

Remove the three screws J attaching the rear panel on the back of the body.

Removing the rear panel (See Fig.14)

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

Disconnect the harness from connector HCW1 of the mother(main) board on the right side of the body. Release the harness from the clamp in the body.

Disconnect the harness from head wire connector DW1 and DW2 extending to the mother(main) board in the body.

Disconnect the harness from connector RCW1 of the power transformer.

Remove the screw K attaching the earth terminal to the base chassis.

Disconnect connector CCW1 and CCW2 connected to the mother(main) board from the front compartment (The mother(main)) board will be detached with the tuner board and the assembly.

Removing the mother(main) board

(See Fig.15 and 16)

Fig.14

Fig.15

Fig.16

Rrear panel

Front panel assembly

Mother (main) board

Headphone board

HCW1

Mother (main) board

Heat sink

Tuner board

DW2

DW1

CCW2

CCW1

Power transformer

RCW1

Clamp

1-9

MX-J100

Removing the heat sink

(See Fig.17 and 18)

Prior to performing the following procedure, remove the mother(main) board.

Remove the three screws L attaching the heat sink cover plate.

Remove the two screws M attaching the power IC to the heat sink and the three screws N attaching the heat sink to the mother (main) board.

Removing the tuner Board

(See Fig. 18 to 20)

The tuner board can be removed even if the mother(main) board is attached.

Release the joint tab f of the tuner board holder and the mother(main) board, and disconnect connector FW1 connected to the mother(main) board. Remove the tuner board assembly (Refer to Fig.18).

Remove the screw O attaching the tuner board holder. Release the two tabs g outward and remove the tuner board from the holder.

Removing the power transformer

(See Fig .21)

Prior to performing the following procedure, remove the top cover and the side covers.

Heat sink cover plate

Tuner board

Heat sink cover plate

Heat sink

Fig.17

Joint tab f

Fig.18

FW1

Mother(main) board

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

Disconnect the harness from connector RCW1 of the power transformer.

Remove the four screws P attaching the power transformer and the screw Q attaching the earth terminal.

ATTENTION:

RCW1

1-10

Prior to disconnecting the power cord from the body, remove the rear panel.

Power transformer

Fig.21

RCW2

Power cord

Tuner board

FW1

Tuner board holder

Fig.19

Tuner board

Fig.20

Tab g

MX-J100

Prior to performing the following procedure, remove the power / CD switch board.

Pull out the volume knob toward the front.

Disconnect the card wire from the mechanism board of the cassette mechanism assembly.

Remove the nine screws S attaching the system board.

Removing the system board

(See Fig.22 and 23)

Remove the three screws R attaching the power / CD switch board and release the three tabs h outward.

Disconnect the harness from connector UCW2 of the power / CD switch board.

Prior to performing the following procedure, remove the top cover, the side covers, the CD tray fitting and the front panel assembly.

Removing the power / CD switch board

(See Fig.22)

Disconnect the card wire from the mechanism board of the cassette mechanism assembly.

Remove the seven screws U attaching the cassette mechanism assembly.

Removing the cassette mechanism assembly (See Fig.25)

Remove the system board temporarily and remove the screw T attaching the headphone board. Pull out the headphone board.

Removing the headphone board

(See Fig.24)

Fig.22

Fig.23

Fig.24

Fig.25

Tab h

Power / CD switch board

Headphone board

Tab h

Cassette mechanism assembly

UCW2

System board

Mechanism board

Front panel assembly

Volume knob

Headphone board

Cassette mechanism assembly

Mechanism board

1-11

MX-J100

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

Removing the CD tray (See Fig.26 to 28)

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

Disconnect the card wire from connector SCW5 of the CD servo board on the upper side of the CD changer unit.

Push down the two tray stoppers marked i and pull out the CD tray.

Loading pulley gear marked c

CD tray

Fig.26

Reinstall the CD tray (See Fig.29 to 30)

Align the gear-cam with the gear-tray as shown fig.29, then mount the CD tray.

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

Gear-cam

Gear-tray

Fig.27

Tray stopper marked i

CD tray

Tray stopper marked i

CD servo board

SCW5

Fig.28

Gear-convert

1-12

Gear-tray

Gear-cam

timing point

Gear-tray

CD tray

Fig.29 Fig.30

Gear-synchro

Removing the sensor board / the tray motor (See Fig.31 to 33)

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

Release the two tabs j attaching the sensor board on the under side of the CD tray.

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

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

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

Hooks k

MX-J100

Tab j

CW1

Tab j

Sensor board

Fig.31

Tray turn table

Tray

Tray turn table motor assembly

Fig.32

Tab m

Fig.33

1-13

MX-J100

Removing the belt, the CD servo board and the switch board (See Fig.34 and 35)

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

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

Disconnect the card wire from the pickup unit connector on the under side of the CD changer unit.

Disconnect the motor wire harness from connector on the CD mechanism board.

Remove the two screws X attaching the CD servo board. First release the n side of the two tabs n and two tabs o attaching the CD servo board motor to raise the CD servo board slightly, then release the o side.

If the tabs n and o are hard to release, it is recommendable to unsolder the two soldered parts on the motor terminal of the CD servo board. Disconnect the terminal CW3 connected to the switch board and remove the CD servo board.

Tabs p

CD changer unit

Fig.34

CD servo board

Tabs o

Belt

Soldered parts

Motor

Tabs n

Release the three tabs p attaching the switch board outward and detach the switch board.

Switch board

CW3

Pickup unit connector

Fig.35

CD mechanism board

motor connecter

1-14

Removing the CD mechanism holder assembly (mechanism included)

(See Fig.36 to 39)

Disconnect the harness from connector on the CD mechanism board in the CD mechanism assembly on the under side of the CD changer unit. Disconnect the card wire from the pickup unit connector.

Remove the screw Y 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 mechanism holder assembly from behind in the direction of the arrow.

Turn the CD mechanism holder assembly half around the lift up slide shaft r of the CD mechanism holder assembly until the turn table is reversed, and pull out the CD mechanism holder assembly.

MX-J100

Motorconnecter

CD changer unit

CD mechanism assembly

Pickup unit connector

Fig.36

Lift up slide shaft

Stopper

CD mechanism holder assembly

Fig.37

Lift up slide shaft r

CD mechanism holder assembly

Fig.39

CD mechanism holder assembly

Fig.38

1-15

MX-J100

Removing the CD mechanism holder from the CD chassis to remove the CD mechanism. (Refer to "Removing the CD mechanism holder assembly" (Pag.2-11))

Removing the pickup unit.

1. Loosen the two screws A fixing the chassis.(Fig.1)

2. Removing the feed gear stopper c on the bottom of the mechanism and pull out the gear. (Fig.1, Fig.3, Fig.4)

3. Pull out the shaft by opening the pickup shaft stopper outward to unlock.(Fig.1, Fig.2)

4. Removing the pickup unit.(Fig.1)

Removing the motor board.

1. Unsolder the motor terminal on the motor board.(Fig.3)

2. Remove the moter board.(Fig.3)

Removing the feed motor.

Remove the two motor fixing screws at B and removing the feed motor.(Fig.1, Fig.3)

Removing the spindle motor.

The spindle motor cannot be removed as a single unit. When removing the spindle motor, change the chasis and turntable together as aunit.(Fig.5)

Stopper

Shutter

Pickup unit

Fig.1

Fig.2

Shaft

Feed Gear

Shaft

Screw

Turn table

Screw

Spindle motor

Motor board

Feed motor

Spindle motor

Unsolder

Fig.3

1-16

Chassis

(Feed gear stopper)

Fig.4Fig.5

MX-J100

• Removing the record/playback mechanism.

Removing the R/P head.

1. Remove the screw A on the right side of the R/P head.(Fig.1, Fig.2)

2. Remove the screw B on the left side of the R/P head.(Fig.1, Fig.2)

Remove the erase head.

Remove the screw C fixing the erase head.(Fig.1)

Removing the pinch roller.

1. Pull out the pinch roller by opening the pinch roller stopper outward to unlock .(Fig.3)

2. When reassembling the pinch roller, refer to fig. 4 to hook up the spring.

R/P Head

E. Head

Stoppsr

Fig.1

Pinch roller assembly

Spring

Pinch roller

Return spring

R/P Head Fig.2

Pinch roller

stopper

Fig.3

Pinch roller

spring

Return spring

Fig.4

1-17

MX-J100

Removing the motor.

1. Remove the two screws D fixing the motor. Be careful to grease's splash when the

drive belt comes off.(Fig.5, Fig.6)

2. Unsolder the motor terminal.(Fig.5)

Removing the mechanism board.

1. Unsolder the four parts a on the solenoid

coil terminal.(Fig.5)

2. Remove the two screws E fixing the board.(Fig.5)

3. Unhook the three parts b from the board.(Fig.5)

4. Remove the mechanism board.(Fig.5)

Removing the flywheel.

Remove the cut-washers at c and d from the

capstan shaft, then remove the flywheen. When reassembling the flywheel, be sure to use new washers as they cannot be reused.(Fig.8, Fig.9)

Drive belt

Mecha.

board

Motor

terminal

Fig.5

Drive belt

Fig.6

Drive belt

Motor

1-18

Sleeve

Flywheel

Washer

Sleeve

FR belt

Capstan

washer

Flywheel

Fig.7

FR belt

Fig.8Fig.9

Capstan

washer

Flywheel

TESTER

MAIN PCB

VT GND

Ajustment method

Tuner

MX-J100

ITEAM

Received FREQ.

Adjustment point

Output

Adjustment Location of Tuner PCB

AM(MW) OSC Adjustment

520~1720 KHz

Adjustment

Non-

1~7.0±0.5V

590 KHz

AM(MW) RF Adjustment

MW -ANT

Maximum Output(Fig1-4)

Fig 1-4 OSC Voltage

1-19

MX-J100

FM THD Adjustment

SSG FREQ.

98 MHz

Adjustment point

FM DETECTOR COIL

(TL3)

Output

60 dB

Minumum Distortion (0.3% below) (Figure 1-1)

FM Search Level Adjustment

SSG FREQ.

Adjustment point

(TSR1)

Output

BEACON SENSITIVITY SEMI-VR(20K½)

28 dB(±2dB)

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 TSR1 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

520 kHz

Adjustment point

AM I.F COIL

(TL2)

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 k½

TL2

1-20

(GND)

VTVM

1. To adjust tape speed

1) Measuring tape: VT 712 (or equivalent)

(Tapes recorded with 3kHz)

2) Connect the cassette deck to the frequency counter as in figure 1-5.

Notes

NOR SPEED Control

OUT (connected to the frequency counter)

Turn UVR2 to left and right (FRONT PCB)

3KHz

Remark

Standard

To Adjust

Pre-Setup

Item

Step

Pre-Setup Condition

1) Deck A:VT 712

2) Press PLAY SW button

3) Deck B:Same as above

Cassette Deck

output

SPK OUT

Frequency Counter

Figure 1-5

Figure 1-6

SPK OUT

Recording /Play head

FWD PLAY

REVERSE PLAY

AZIMUTH control screw

Figure 1-7

In Out

Cassette Deck

Oscilloscope

±1% range

Figure 1-8

Audio OSC.

SET (MAIN PCB)

Oscilloscope

AUX IN

LINE OUT

VTVM

DW2

IN OUT

Cassette deck

MX-J100

1-21

MX-J100

2. To adjust playback lebel/REC

Notes

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

2) Measuring tape : i) VT 705(or equivalent 12.5kHz AZIMUTH control)

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

1 Adjust Deck A Play Level

Step

Item

Pre-Setup Condition

Pre-Setup

To Adjust

Standard

Remark

After putting VT705

TP1 OUT

AZIMUTH

Adjust Deck B Play Level/REC BIAS

Step

Item

AZIMUTH

Recording Bias Voltage

(VTVM is connected to the scope)

Pre-Setup Condition

TP1 OUT (VTVM is connected to the scope)

Fig 1-8

into Deck A

- Press FWD PLAY button.

After putting VT705 into Deck B

1)Press FWD PLAY button.

2)Press REV PLAY button.

After putting MTT5512 into Deck B

1)Press REC PLAY button.

2)MAIN PCB DCW2, connectted to VTVM

Pre-Setup

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

To Adjust

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

Turn DVR1,DVR2

to the right and left

Max output and same phase (both channels)

Standard

Max output and same phase (both channels)

7V(±0.5V)

After adjustment secure it with REGION LOCK.

Remark

After adjustment secure it with REGION LOCK.

1-22

Flow of functional operation until TOC read

Power ON

Play Key

RESET a CD LSI

Confirm that the voltage at the pin38 of KB9223(IC922) is "L" "H".

MX-J100

Check Point

LIMIT SW ON

SET Default value of TE gain, TE balance

Automatic adjusting of

focus bias

Automatic adjusting of

FE offset

Automatic adjusting of

TE offset

LASER power ON

Detection of disk

Confirm that the voltage at the pin41 of KB9223(IC922) is "H" "L" "H".

Confirm that the voltage at the pin70 of KB9223(IC922) is 3.5V.

Tracking error waveform at TOC reading

Pin 54 of KB9223/TE (IC922)

Approx

0.4V

2.50V

Disc states to rotate

Approx.3.7sec

Disc is rotated

Automatic adjusting of

TE balance

Automatic adjusting of

TE gain

TOC reading

Play a disc

Confirm that the signal from pin46 of KB9223(IC922) is 3.5V as a accelerated pulse during approx.1.96s.

Confirm the waveform of the Tracking error signal at the pin 54 of KB9223(IC922).

Confirm the eye-pattern at the pin74 of KB9223(IC922).

1-23

+ 51 hidden pages