JVC XVNA-7-SL Service manual

A0036200209

XV-NA7SL

SERVICE MANUAL

DVD AUDIO/VIDEO PLAYER

XV-NA7SL

TABLE OF CONTENTS

1 Important Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3 Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4 Adjustment method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

5 Description of major ICs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

6 Glossary of term and abbreviations(for AV Decoder section). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

No.A0036

2002/10

SECTION 1

Important Safety Precautions

1.1 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 vo id the manufacturers 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 specia l safety characteristics are identified in the Parts List of Service Manual. Electrical components having such featur es ar e 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 reassembling.

(5) Leakage shock hazard testing)

After reassembling 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 direct ly into the AC outle t. Use a n AC voltmeter having, 1,000 ohms per volt or more sensitivity in the following manner. Connect a 1,500 ohm 10W resistor paralleled by a 0.15 µF AC-type capacitor between an exposed metal part and a known good earth ground. Measure the AC voltage across the resistor with the AC

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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.).

1.2 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 lo-

cal voltage.

1.3 Caution 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.

1.4 Critical parts for safety

In regard with component parts appearing on the silk-screen printed 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 " " ma rk 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 JC version)

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1.5 Preventing static electricity

Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.

1.5.1 Grounding to prevent damage by static electricity

Static electricity in the work area can destroy the optical pickup (laser dio de) in devices such as DVD players. Be careful to use proper grounding in the area where repairs are being performed.

(1) Ground the workbench

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

(2) Ground yourself

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

(3) Handling the optical pickup

• 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.)

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

1.6 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 picku p. 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)I t is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.

1.7 Important for laser products

(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.

VARNING

Osynlig laserstrålning är denna del är öppnasd och spårre n är urkopplad. Betrakta ej strålen.

VARO

Avattaessa ja suojalulitus ohitettaessa olet alttiina näkymättömälle lasersateilylle. Älä katso säteeseen.

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(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 dir ectly or touch it in case of anadjustment or operation check.

ADVARSEL

Usynlig laserstrling ved åbning, når sikkerhedsafbrydere er ude af funktion. Undgå udsasttelse for stråling.

ADVARSEL

Usynlig laserstråling ved åpning, når sikkerhetsbryteren er avslott. unngå utsettelse for stråling.

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1.8 Precautions for Service

1.8.1 Handling of Traverse Unit and Laser Pickup

(1) Do not touch any peripheral element of the pickup or the actuator. (2) The traverse unit and the pickup are precision devices and therefore must not be subjected to strong shock. (3) Do not use a tester to examine the laser diode. (The diode can easily be destroyed by the internal power supply of the tester.) (4) To replace the traverse unit, pull out the metal short pin for protection from charging. (5) When replacing the pickup, after mounting a new pickup, remove the solder on the short land which is provided at the center

of the flexible wire to open the circuit.

(6) Half-fixed resistors for laser power adjustment are adjusted in pairs at shipment to match the characteristics of the optical block.

Do not change the setting of these half-fixed resistors for laser power adjustment.

1.8.2 Destruction of Traverse Unit and Laser Pickup by Static Electricity

Laser diodes are easily destroyed by static electricity charged on clothing or the human body. Before repairing peripheral elements of the traverse unit or pickup, be sure to take the following electrostatic protection:

(1) Wear an antistatic wrist wrap. (2) With a conductive sheet or a steel plate on the workbench on whi ch the traverse unit or th e pick up is to be repaired, ground

the sheet or the plate. (3) After removing the flexible wire from the connector (CN101), short-circuit the flexible wire by the metal clip. (4) Short-circuit the laser diode by soldering the land which is provided at the center of the flexible wire for the pickup.

After completing the repair, remove the solder to open the circuit.

Please refer to "Fig.8" of "Disassembly method" for details.

SECTION 2

Disassembly method

There is a part different from the photograph a ccording to the model and the destination though explains this disassembly method by using version for europe.

2.1 Main body section

2.1.1 How to remove a top cover (See Figure 1)

(1) Screw A attaches a top cover to the main part. Remove

the two screws A from the both sides of the main part.

(2) Screw B attaches the top cover to the main part. Remove

the three screws B from the rear side of the main part.

(3) Raise the both sides and lower pa rt of the rear of the top

cover, with opening them slightly in an outward direction. And the top cover will be removed.

2.1.2 How to remove a front panel assembly (See Figure 2, 3, and 4.)

• Please remove a top cover before removing a front panel as-

sembly.

• Front panel assembly can be removed without removing

mechanism assembly. (1) Insert a kind of screwdriver in a hole located in the left side

of mechanism assembly, and push a lever until it cannot be inserted any further.

(2) And then, a tray will come out. Remove the tray in an up-

per direction, with slightly opening the lower part of fitting in an outward direction.

(3) Screw C attaches LCD display & operation switch board to

the main part. Remove the screw C.

(4) Extract a card wire from connector CN1 on LCD display &

operation switch board.

(5) Remove I screw that attach the front panel assembly to the

main part.

(6) Remove two hook "a"s and two "b"s. Remove front panel

assembly in a front direction.

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Fig.1

Fig.2

Fig.3

Fig.4

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2.1.3 How to remove a rear panel (See Figure 5 and 6)

• Please remove a top cover before removing a rear panel.

(1) Screw D attaches a rear panel to the main part. Remove

the thierteen screws D.

(2) Extract a power cord from socket P901 on a power supply

board.

(3) Remove two tie bands.

2.1.4 How to remove a mechanism assembly & servo control board (See Figure 7 and 8)

• Please remove a top cover, a front panel assembly, and a rear

panel before removing a mechanism assembly & servo control board. (1) Extract flat wire from connector JT911, JT912, and JT913

on a power supply board.

(2) Extract card wire from connector CN902 and CN704 on a

power supply board and servo control & main board .

(3) Screw E attaches servo control & main board to the main

part. Remove one screw E.

(4) Screw F attaches a mechanism assembly. Remove three

screws F.

(5) Remove two hook "c"s. And then, remove servo control &

main board with sliding it in a front direction.

(6) Two card wires are connected to servo control & main

board. Extract this card wire from CN201 and CN202 respectively.

(7) A wire is connected to servo control & main board from a

pickup. Extract it from CN101.

ATTENTION: At this time, please extract the wire after short-circuited of two places on the wire in part d with solder. Please remove the solder two places of part d after connecting the wire with CN101 when reassembling.

Fig.5

Fig.6

Fig.7

Fig.8

2.1.5 How to remove a power supply board (See Figure 9 and 5)

• Please remove a top cover before removing a power supply

board. (1) Extract flat wire from connector JT911, JT912, and JT913

on a power supply board.

(2) Extract card wire from connector CN902 on apower supply

board.

(3) Extract power supply cord from socket P901 on a power

supply board.

(4) Remove one screw G that attaches a power supply board

and four screws D that attaches a power supply board from the rear side.

2.1.6 How to remove a surround audio board (See Figure 10)

• Please remove a top cover before removing a surround audio

board. (1) Extract card wire from connector CN704 on a servo control

& main board.

(2) Remove two screws J that attaches a surround audio

board and two screws K that attaches a surround aud io board from the rear side.

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Fig.9

Fig.5

Fig.10

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2.1.7 How to remove LCD display & operation switch board (See Figure 11, 12, and 13)

• Please remove a top cover and a front panel assembly before

removing LCD display & operation switch board. (1) Extract card wire and flat wire from connector CN2, CN 3,

and CN8 on LCD display board.

(2) Remove four screws H that attach an operation switch

board, and then operation switch board.

(3) Remove support button, LCD display board, and push but-

ton in this order.

• When the main part is assembled, parts must be assem-

bled in the following order: Push button LCD display board Side LED board

Support button Operation switch board.

• After the operation switch board is attached to its place,

let a card wire through a slit on the operation switch board, and then insert it in CN2. (See Figure 11.)

Fig.11

Fig.13

Fig.12

SECTION 3

Mechanism

3.1 Loading assembly section

3.1.1 Removing the clamper assembly (See Fig.1)

(1) Remove the four screws A attaching the clamper assembly. (2) Move the clamper in the direction of the arrow to release

the two joints a on both sides.

ATTENTION:

When reattaching, fit the clamper to the two joints a.

3.1.2 Removing the tray (See Fig2. and 3)

Note:

• Prior to performing the following procedure, remove the clamper assembly.

(1) Push b of the slide cam into the slot on the left side of the

loading base until it stops.

(2) Draw out the tray toward the front.

ATTENTION:

Before reattaching the tray, slide the part c of the slide cam to the right as shown in Fig.3.

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Fig.1

Fig.2

Fig.3

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3.1.3 Removing the traverse mechanism assembly (See Fig.4 and 5)

Note:

• Prior to performing the following procedure, remove the clamper assembly and the tray.

(1) Remove the four screws B attaching the traverse mechanism

assembly.

ATTENTION:

Before reattaching the traverse mechanism assem bly, pass the card wire extending from the spind le motor board through the notch d of the elevator.

Fig.4

Fig.5

3.1.4 Removing the elevator (See Fig.6)

Note:

• Prior to performing the following procedure, remove the clamper assembly, the tray and the traverse mechanism assembly. (1) Extend each bar e inside of the loading base outward and detach the elevator shaft.

ATTENTION:

When reattaching, first fit the two shafts on the front of the elevator to the slots f of the slide cam.

Fig.6

3.1.5 Removing the motor assembly (See Fig.7 and 8)

Note:

• Prior to performing the following procedure, remove the clamper assembly, the tray.the traverse mechanism assembly and the elevator.

(1) Remove the belt from the pulley. (2) Remove the screw C attaching the motor assembly. (3) Turn over the body and remove the screw D attaching the

motor assembly.

(4) Release the two tabs g retaining the motor board.

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Fig.7

Fig.8

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3.1.6 Removing the Idle gear/pully gear/middle gear/s litecam (See Fig.9 to 11)

Note:

• Prior to performing the followong procedure,remove the clamper assembly,the tray,the traverse mechanism assembly,the elevator and the motor assembly.

(1) Press the two tabs h inward and pull out idle gear. (2) Remove the screw E attaching the pulley gear bracket.

Slide t h e p u l l ey gear br a c k et in the d i r ection of the arrow and pull out the pulley gear. (3) Slide the side cam in the direction of the arrow to release the two joints i and remove upward. (4) Remove the middle gear.

Fig.10

Fig.9

Fig.11

3.2 Traverse mechanism assembly section

3.2.1 Removing the feed motor assembly (See Fig.12)

(1) Unsolder the two soldering j on the spindle motor board. (2) Remove the four screws F attaching the feed moto r as-

sembly.

3.2.2 Removing the feed motor (See Fig.12 to 14)

Note:

• Prior to performing the following procedure, remove the feed motor assembly.

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Fig.12

(1) Remove the screw G attaching the thrust spring.

ATTENTION:

When reattaching the thrust spring, make sure that the thrust spring presses the feed gear (M) and the feed gear (E) reasonably.

(2) Remove the feed gear (M). (3) Pull out the feed gear (E) and the lead screw. (4) Remove the two screws H attaching the feed motor.

ATTENTION:

When reattaching, pass the two cables extending from the feed motor through the notch k of the feed holder as shown in Fig13.

Fig.13

Fig.14

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3.2.3 Removing the pickup (See Fig.16 and 18)

(1) Remove the screw I attaching the T spring (S) and the

shaft holder. Remove also the plate.

ATTENTION:

When reattaching,make sure that the T spring (S) presses the shaft.

(2) Pull out the part l of the shaft upward. Move the part m in

the direction of the arrow and detach from the spindle base.

(3) Disengage the joint n of the pickup and the shaft in the

direction of the arrow. (4) Pull out the shaft from the pickup. (5) Remove the two screws J attaching the actuator. (6) Disengage the joint of the actuator and the lead spring.

Pull out the lead spring.

Fig.16

Fig.15 The spring must be under the shaft when you install pick-up.

3.2.4 Removing the shaft holder / shaft (See Fig.18)

(1) Remove the screw K attaching the shaft holder. (2) Remove the shaft.

Fig.17

Fig.18

3.2.5 Removing the spindle motor assembly (See Fig.19 to 21)

(1) Remove the three screws L attaching the spindle motor on

the bottom of the mechanism base.

ATTENTION:

When reattaching, pass the card wire extending from the spindle motor board through the notch of the spindle base.

(2) Remove the three screws M attaching the spindle base.

Fig.19

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Fig.21

Fig.20

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SECTION 4

Adjustment method

4.1 Test mode setting method

(1) Take out the disc and close the tray. (2) Unplug the power plug. (3) Insert power plug into outlet while pressing both "PLAY" key and "STOP" key of the main body. (4) The player displays " TEST_ " on the LCD display. " " means the player version. (5) When the power supply is turned off, test mode is released.

The mode changes as follows whenever the "CHOICE" key of remote controller is pushed in test mode.

4.2 Initialization method Please initialize according to the following procedures when microprocessor or pick-up is exchanged and when the

up-grade is done.

(1) Makes to test mode. (2) "PAUSE" key of the main body is pushed. (3) When the DVD AUDIO indicator lights blue, it is initialization completion.

4.3 Method of displaying version of microcomputer

(1) Makes to test mode and initializes (2) When "CHOICE" key of remote controller is pushed once, the figure is displayed on the LCD display as follows.

* Version number of decoder is displayed on the television screen. * Last two digits are displayed on the FL display for the treble version number.

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4.4 Display of current value of laser

(1) Makes to test mode and initializes. (2) When "CHOICE" key of remote controller is pushed four times, It is displayed on the LCD display, "CHECK". (3) Afterwards, the laser current value can be switched by pushing the key to remote controller without turning on the disc.

Remote controller "4" key --- Laser of CD Remote controller "5" key --- Laser of DVD

(4) The laser output stops if the "STOP" key to remote controller is pushed.

It can be judged it is simply good if the displayed current value of the laser is smaller than that of the undermentioned value. Moreover, there must be a deteriorated possibility and the pick-up must exch ange the pick-up more than the undermentioned value.

Laser current value of CD ------ 49 mA or less Laser current value of DVD ---- 64 mA or less

4.5 Display of jitter value

(1) Makes to test mode and initializes. (2) When "CHOICE" key of remote controller is pushed four times, It is displayed on the LCD display, "CHECK". (3) The test disk (VT-501) is inserted, and the "PLAY" key to the main body is pushed. (4) After a few seconds, the jitter value is displayed on the LCD display as follows.

In the following cases, please "Flap adjustment of the pick-up guide shaft" referring to the following page. Before using the TEST disc VT-501, careful check it if there is neither damage nor dirt on the read surface.

< In the following cases, please adjustment >

• When you exchange the pick-up

• When you exchange the spindle motor

• When the reading accuracy of the signal is bad (There is a block noise in the scr een etc..)

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4.6 Upgrading of firmware

(1) The power supply is turned on pushing the "POWER" key. (2) The up-grade disc is inserted. (3) When LCD display of the main body changes from "READING" into "UPGRADE", cursor "UP" key ( ) of remote controller

is pushed. (4) The up-grade starts if the entire screen becomes blue and it is displayed, "Upgrade progress". (5) The tray opens automatically, the up-grade disc is removed. (6) The up-grade ends if the tray closes automatically, and the screen returns to the normal screen. (7) Please confirm the version of the microcomputer after makes to test mode and initializes.

The disc for the up-grade is usually one piece. The disc becomes two pieces according to the version. In that case, please note the undermentioned content.

*The up-grade is done by using the STEP1 disc according to "(1)" and "(4)" of the above-mentioned procedure. *The tray opens automatically after a few seconds and exchange for the disc of STEP2, please. *The tray closes automatically. There is only about five second time that the tray opens this time,and replace the disc quickly between

those, please.

ATTENTION:

• When the tray shuts with the STEP1 disc left for the tray

The up-grade starts again and exchange for the STEP2 disc, please when the tray opens automatically.

• When the tray closes with there no disc in the tray

Because the tray opens automatically, the disc of STEP2 is put on the tray. The power supply is turned off once pushing the "POWER" key. The up-grade starts when the "POWER" key is pushed afterwards.

* After the up-grade ends, the STEP2 disc is removed because the tray opens automatically. * Afterwards, it is the same as (6),(7) of the above-mentioned procedures.

4.7 Display of region code

(1) Makes to the stand-by state. (2) The "POWER" key is pushed while pushing the "BACK SKIP" key and the "FORWARD SKIP" key to the main body. (3) Region code is displayed on the LCD display as follows.

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4.8 Flap adjustment of the pick-up guide shaft

4.8.1 Tool list for adjustment

Hex wrench for adjustment : Off-the-shelf (1.3mm) Test disc : VT-501 or VT-502 Stand of about 150mm in height : 2 pcs

(1) Puts into the state to display the jitter value on the LCD display referring to "3.5 Display of the jitter value". (2) A hex-head wrench is inserted in the hole three places for the adjustment in the main body bottom, and the adjustment screw

is turned, and matches so that the jitter value displayed on the LCD display mey become maximum value.

ATTENTION:

As this value is bigger, the jitter is more allowable in this model.

POINT:

(1) Turns in the forward or the opposite direction, and makes to the position where the jitter value is good the half rotation of

adjustment screw a and b(180 degrees) respectively.

(2) Afterwards, adjustment screw b and c are turned in the same way, and makes to the best position.

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4.9 Attention when pick-up is exchanged

(1) Flexible wire, pick-up spring, switch actuator, and lead

spring are removed from an old pick-up (broken the one).

Guide:

Flexible wire, pick-up spring and switch actuator,lead spring are removed without each decomposing while assembled.

(2) The above-mentioned parts are installed in a new pick-up

(non-defective article). (3) A flexible wire is inserted in the connector which has taken

side with the pick-up, and solder is put up to short land part

"a" two places on a flexible wire. (4) The electrostatic breakdown protection circuit attached to

the pick-up is cut.

ATTENTION:

Please cut the electrostatic breakdown protection circuit attached to the pick-up after solder is put up to two places on a flexible wire short land part "a" of the insertion of a flexible wire this time in the connector without fail. The procedure might be mistaken and if solder has not surely adhered to two places on a flexible wire short land part "a", the laser diode in the pick-up be destroyed again.

(5) The pick-up is installed in the traverse mechanism. (6) A flexible wire is connected with connector CN101 on the

servo control board by installing the traverse mechanism

in the loading mechanism. (7) Solder in two places on a flexible wire in part "a" is re-

moved.

ATTENTION :

Please remove solder in two places in part "a" after connecting a flexible wire with connector CN101 on the servo control board without fail this time. When the procedure is mistaken, the laser diode in the pick-up might be destroyed. Please remove solder in two places in part "a" surely.

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4.10 Confirm method of operation Please confirm the operation of the undermentioned item after doing the repair and the upgrade of the firmware.

The EEPROM is initialized. Refer to the initialization method.

Opening picture check (Power ON) It should be display "JVC"

Muting working The noise must not be had to the performance beginning when you push "PLAY" button or

at ON/STANDBY.

FL Display The mark and the logo, etc. displayed by each operation must be displayed correctly.

FL Display should light correctly without any unevenness.

All Function button All function buttons should worked correctly with moderate click feeling.

Open and close movement of tray When press OPEN/CLOSE button the tray should move smoothly without any noise.

Remote controller unit working Check the correctly operation in use of remote controller unit.

Reading of TOC Be not long in the malfunction.

Search Both forward-searches and backward-searches should be able to be done.

Do not stop be searching or after the search.

Skip Both forward-skip and backward-skip should be able to be done.

Do not stop be after the skip.

Playback Do not find abnormality etc. of tone quality and the picture quality.

Most outside TITLE playback check Play VT-501 TITLE 59 CHAPTER 1 , check normal playback.

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4.11Troubleshooting

4.11.1 Servo volume

Fig.1

4.12Check points for each error

4.12.1 Spindle start error

(1) Defective spindle motor

• Are there several ohms resistance between each pin of CN201 "5-6","6-7","5-7"? (The power supply is turned off and measured.)

• Is the sign wave of about 100mVp-p in the voltage had from each terminal? [ CN201"9"(H1-),"10"(H1+),"11"(H2-),"12"(H2+),"13"(H3-),"14"(H3+) ]

(2) Defective spindle motor driver (IC251)

• Has motor drive voltage of a sine wave or a rectangular wave gone out to each terminal(SM1~3) of CN201"5,6,7" and IC251"2,4,7"?

• Is FG pulse output from the terminal of IC251"24"(FG) according to the rotation of the motor?

• Is it "L(about 0.9V)" while terminal of IC251"15"(VH) is rotating the motor?

(3) Has the control signal come from servo IC or the microcomputer?

• Is it "L" while the terminal of IC251"18"(SBRK) is operating? Is it "H" while the terminal of IC251"23"(/SPMUTE) is operating?

• Is the control signal input to the terminal of IC251"22"(EC)? (changes from VHALF voltage while the motor is working.)

• Is the VHALF voltage input to the terminal of IC251"21"(ECR)?

(4) Is the FG signal input to the servo IC?

• Is FG pulse input to the terminal of IC301"69"(FG) according to the rotation of the motor?

4.12.2 Disc Detection, Distinction error (no disc, no RFENV)

• Laser is defective.

• Front End Processor is defective (IC101).

• APC circuit is defective. --- Q101,Q102.

• Pattern is defective. --- Lines for CN101 - All patterns which relate to pick-up and patterns between IC101

• IC101 --- For signal from IC101 to IC301, is signal output from IC101 "20" (ASOUT) and IC101 "41"(RFENV) and IC101 "22" (FEOUT)?

4.12.3 Traverse movement NG

(1) Defective traverse driver

• Has the voltage come between terminal of CN101 "1" and "2" ?

(2) Defective BTL driver (IC201)

• Has the motor drive voltage gone out to IC201"17" or "18"?

(3) Has the control signal come from servo IC or the microcomputer?

• Is it "H" while the terminal of IC201"9"(STBY1) ?

• TRSDRV Is the signal input? (IC301 "67")

(4) TRVSW is the signal input from microcomputer? (IC401 "50")

4.12.4 Focus ON NG

• Is FE output ? --- Pattern, IC101

• Is FODRV signal sent ? (R209) --- Pattern, IC301 "115"

• Is driving voltage sent ?

• IC201 "13", "14" --- If NG, pattern, driver, mechanical unit .

• Mechanical unit is defective.

4.12.5 Tracking ON NG

• When the tracking loop cannot be drawn in, TE shape of waves does not settle.

• Mechanical unit is defective. Because the self adjustment cannot be normally adjusted, the thing which cannot be normally drawn in is thought.

• Periphery of driver (IC201) Constant or IC it self is defective.

• Servo IC (IC301) When improperly adjusted due to defective IC.

XV-NA7SL

4.12.6 Spindle CLV NG

• IC101 -- "35"(RF OUT), "30"(ARF-), "31(ARF+).

• Does not the input or the output of driver's spindle signal do the grip?

• Has the tracking been turned on?

• Spindle motor and driver is defective.

• Additionally, "IC101 and IC301" and "Mechanism is defective(jitter)", etc. are thought.

4.12.7 Address read NG

• Besides, the undermentioned cause is thought though specific of the cause is difficult because various factors are thought. Mechanism is defective. (jitter) IC301, IC401. The disc is dirty or the wound has adhered.

4.12.8 Between layers jump NG (double- layer disc only)

Mechanism defective Defect of driver's IC(IC201) Defect of servo control IC(IC301)

4.12.9 Neither picture nor sound is output

(1) It is not possible search

• Has the tracking been turned on?

• To "(5) Tracking ON NG" in "Check points for each error" when the tracking is not normal.

• Is the feed operation normal? To "(3) traverse movement NG" in "Check points for each error" when it is not normal. Are not there caught of the feeding mechanism etc?

4.12.10 Picture is distorted or abnormal sound occurs at intervals of several seconds.

Is the feed operation normal? Are not there caught of the feeding mechanism etc?

4.12.11 Others

• The image is sometimes blocked, and the image stops.

• The image is blocked when going to outer though it is normal in suroundings in the disk and the stopping sympton increases.

There is a possibility with bad jitter value for such a symptom.

4.12.12 CD During normal playback operation

(1) Is TOC reading normal?

• Displays total time for CD-DA.

• Shifts to double-speed mode for V-CD

(2) Is playback afterwards possible? (3) When can not do a normal playback

• --:-- is displayed during FL search. According to [It is not possible to search ] for DVD(9), check the feed and tracking systems.

• No sound is output although the time is displayed.(CA-DA) DAC, etc, other than servo.

• The passage of time is not stable, or picture is abnormal.(V-CD)

• The wound of the disc and dirt are confirmed.

SECTION 5

Description of major ICs

5.1 74LCX373MTC-X(IC512,IC513)

• Pin layout • Pin function Symbol

D0~D7 LE OE Q0~Q7

• Truth table

H = HIGH Voltage level L = LOW Voltage level Z = High impedance X = Immaterial Q0 = Previous Q0 before HIGH to LOW transition of latch enable

Description Data inputs Latch enable input Output enable input 3-State latch outputs

X H H L

INPUTS OUTPUTS

L L L

Dn Qn

X L H X

Z L H

XV-NA7SL

5.2 BA5983FM-X (IC201) : 4CH Driver

• Block diagram

• Pin function Pin No. Symbol I/O Description

1 BIAS IN I Input for Bias-amplifier 2 OPIN1(+) I Non inverting input for CH1 OP-AMP 3 OPIN1(-) I Inverting input for CH1 OP-AMP 4 OPOUT1 O Output for CH1 OP-AMP 5 OPIN2(+) I Non inverting input for CH2 OP-AMP 6 OPIN2(-) I Inverting input for CH2 OP-AMP 7 OPOUT2 O Output for CH2 OP-AMP 8 GND - Substrate ground

9 STBY1 I Input for CH1/2/3 stand by control 10 PowVcc1 - Vcc for CH1/2 power block 11 VO2(-) O Inverted output of CH2 12 VO2(+) O Non inverted output of CH2 13 VO1(-) O Inverted output of CH1 14 VO1(+) O Non inverted output of CH1 15 VO4(+) O Non inverted output of CH4

Pin No. Symbol I/O Description

16 VO4(-) O Inverted output of CH4 17 VO3(+) O Non inverted output of CH3 18 VO3(-) O Inverted output of CH3 19 PowVcc2 - Vcc for CH3/4 power block 20 STBY2 I Input for Ch4 stand by contro l 21 GND - Substrate ground 22 OPOUT3 O Output for CH3 OP-AMP 23 OPIN3(-) I Inverting input for CH3 OP-AMP 24 OPIN3(+) I Non inverting input for CH3 OP-AMP 25 OPOUT4 O Output for CH4 OP-AMP 26 OPIN4(-) I Inverting input for CH4 OP-AMP 27 OPIN4(+) I Non inverting input for CH4 OP-AMP 28 PreVcc - Vcc for pre block 29 - Connect to ground 30 - Connect to ground

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JVC XVNA-7-SL Service manual

Specifications and Main Features

Frequently Asked Questions

User Manual