JVC VS-DT88V Service Manual

SERVICE MANUAL

COMPACT COMPONENT SYSTEM

VS-DT88V

Area suffix

UF ---------------------------- China

VS-DT88V

STANDBY/ON

123

FM/AM

MD/AUX

+10

CANCELMPX

VCD No. VCD No.

SET

PBC

SCREEN

TREBLEBASSAHB PRO

PREV. CD SELECT NEXT

VIDEO

HIGH

INTRO

LIGHT&RETURN STILL

CLOCK

SLEEPDIMMER

REPEAT

/TIMER

PLAY

MODE

OPEN

DISPLAY

COLOR

/CLOSE

VOLUME

Contents

Safety precautions Preventing static electricity Important for laser products Disassembly method Flow of functional operation until TOC read

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

1-15

COMPACT COMPONENT SYSTEM

SP-VSDT88VCA-VSDT88VSP-VSDT88V

Maintenance of laser pickup Replacement of laser pickup Description of major ICs

1-16 1-16 1-17~34

No.21179

Sep. 2002

VS-DT88V

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 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 each exposed metal part, particularly any exposed metal part having a return path to the chassis, and meausre the AC voltage across the resistor. Now, reverse the plug in the AC outlet and repeat each measurement. Voltage measured any must not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.).

0.15 F AC TYPE

1500 10W

Good earth ground

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

Place this probe on each exposed metal part.

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

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

3. Repairs 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.

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 " " mark nearby are critical for safety. (This regulation does not correspond to J and C version.)

1-2

VS-DT88V

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

Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as CD players. 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

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 internal power source can easily destroy the laser diode.

4. Handling the traverse unit (optical pickup)

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

Remove solder of the short land on the flexible wire 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.

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

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

5. Attention when traverse unit is decomposed

*Please refer to "Disassembly method" in the text for the CD pickup unit.

Flexible wire

Apply solder to the short land before the flexible wire is disconnected from the connector CN601 on the (If the flexible wire is disconnected without applying solder, the CD pickup may be destroyed by static electricity.) In the assembly, be sure to remove solder from the short land after connecting the flexible wire.

CD servo board

CN601

Short land

CD servo board

1-3

VS-DT88V

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 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

CLASS 1

LASER PRODUCT

CAUTION: Invisible laser radiation when open and interlock failed or defeated. AVOID DIRECT EXPOSURE TO BEAM. (e)

ADVARSEL: Usynlig laserstråling ved åbning, når sikkerhedsafbrydere er ude af funktion. Undgåudsættelse for stråling. (d)

interlock failed or defeated.

AVOID DIRECT EXPOSURE

TO BEAM. (e)

CAUTION: Invisible laser

radiation when open and

ADVARSEL: Usynlig laser-

stråling ved åbning, når

sikkerhedsafbrydere er ude

af funktion. Undgåudsæt-

telse for stråling. (d)

VARNING: Osynlig laser-

strålning när denna del är

öppnad och spärren är

urkopplad. Betrakta ej

strålen. (s)

VARO: Avattaessa ja

suojalukitus ohitettaessa

oleta lttiina näkymättö-

mälle lasersäteilylle.

Älä katso

säteeseen. (f)

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

VARO: Avattaessa ja suojalukitus ohitettaessa oleta lttiina näkymättömälle lasersäteilylle. Älä katso

säteeseen. (f)

1-4

VS-DT88V

Disassembly method

Removing the top lens (See Fig. 1.)

From the top side of the main body, remove the four screws A attaching the top lens.

Removing the bottom panel

(See Figs. 2 and 3.)

From the rear side of the main body, remove the three screws B attaching the bottom panel.

(See Fig.2.)

From the bottom side of the main body, remove the two screws C attaching the bottom panel.

(See Fig.3.)

Remove the bottom panel in an upward direction.

Top lens

Fig.1

Top panel

Bottom panel

Fig.2

Removing the top panel (See Fig. 4.)

Remove the top lens. Remove the bottom panel.

1.2.Slide the top panel toward the rear (direction of the arrow), disengage it from the engagement sections a of the front panel assembly and engagement sections b of the bottom chassis.

Remove the top panel in an upward direction.

Bottom panel

Fig.3

Top panel

Front panel assembly

Fig.4

1-5

VS-DT88V

Removing the CD&Video CD mechanism assembly (See Fig. 5.)

Remove the top lens. Remove the bottom panel. Remove the top panel.

From the top side of the main body, disengage the claw c of the CD&Video CD mechanism assembly and then remove the push button.

Remove the five screws D, screw E and screw F attaching the CD&Video CD mechanism assembly.

Disconnect the wire from connector CN801 on the LED board.

Remove the CD&Video CD mechanism assembly in an upward direction.

Removing the front panel assembly

(See Figs. 6 and 7.)

Remove the top lens. Remove the bottom panel. Remove the top panel. Remove the CD&Video CD mechanism assembly.

Remove the tie band bundling the wires of the front panel assembly. (See Fig.6.)

CN801

LED board

Main board

Wire holder

Claw c

CN171

CN183

Push button

Fig.5

CN182

CD&Video CD mechanism assembly

Bottom chassis

Tie band

Disconnect the wires from connectors CN106 and CN182 on the main board. (See Fig.6.)

Disconnect the card wires from connectors CN171 and CN183 on the main board. (See Fig.6.)

Remove the wire holder holding the card wire of the front panel assembly. (See Fig.6.)

From the front side of the main body, remove the two screws G attaching the front panel assembly.

(See Fig.7.)

Disengage the claws d of the front panel assembly from the bottom chassis and then remove the front panel assembly in the direction of arrow.

(See Fig.6.)

[Reference] Before attaching the front panel assembly, pass the card wire of the front panel assembly through the hole on the bottom chassis. After attaching the front panel assembly, bundling the card wire and wires of the front panel assembly using a wire holder and tie band.

Claws d

Fig.6

Fig.7

CN106

Front panel assembly

Claws d

Front panel assembly

1-6

Removing the tuner board

(See Figs. 8 and 9.)

Remove the top lens. Remove the bottom panel. Remove the top panel. Remove the CD&Video CD mechanism assembly.

Disconnect the card wire from connector CN111 on the main board. (See Fig.8.)

Disconnect the wire from connector CN190 on the tuner board. (See Fig.8.)

From the rear side of the main body, remove the two screws H attaching the FM/AM antenna terminals on the tuner board. (See Fig.9.)

Take out the tuner board from the bottom chassis.

Wire clamp

Speaker board

CN103

CN102

Tuner board

Bottom chassis

Notch

Tie band

CN190

CN111

VS-DT88V

CD & Video CD mechanism wire

CN101

Fig.8

Tie band

Main board

Removing the speaker board

(See Figs. 8 and 9.)

Remove the top lens. Remove the bottom panel. Remove the top panel. Remove the CD&Video CD mechanism assembly.

Remove the tie bands bundling the wires on the speaker board. (See Fig.8.)

Disengage the wire clamp bundling the wire of the CD&Video CD mechanism wire. (See Fig.8.)

Disconnect the wires from connectors CN101, CN102 and CN103 on the speaker board.

(See Fig.8.)

From the rear side of the main body, remove the four screws J attaching the speaker/digital out terminals on the speaker board. (See Fig.9.)

Take out the speaker board from the bottom chassis.

[Reference] After connecting the wires to the speaker

board, bundle them using a tie band. Insert the CD&Video CD mechanism assembly wire into the notch on the bottom chassis. (See Fig. 8.)

Rear panel

Speaker terminal Digital out terminal

Fig.9

FM antenna terminal

AM antenna terminal

1-7

VS-DT88V

Removing the main board

(See Figs. 10 to 12.)

Remove the top lens. Remove the bottom panel. Remove the top panel. Remove the CD&Video CD mechanism assembly. Remove the front panel assembly. Remove the tuner board. Remove the speaker board.

From the bottom side of the bottom chassis, remove the screw K attaching the main board.

(See Fig.10.)

Disengage the wire clamp bundling the wire of the power transformer. (See Fig.11.)

Disconnect the wires from connectors CN181, CN191 and CN194 on the main board.

(See Fig.11.)

Disconnect the wire from connector CN192 on the power amplifier board.(See Fig.11.)

Remove the screw L, which retains the main board, together with the wire holder. (See Fig.11.)

Remove the two screws M, screw M' and screw N attaching the main board. (See Fig.11.)

Remove the two screws P attaching the main board and then remove the rear panel. (See Fig.12.)

Main board

Wire holder

Bottom chassis

Fig.10

Bottom chassis

Wire clamp

CN191

CN194

CN181

LM'

CN192

Earth wire

Power transformer

Power amplifier board

Take out the main board with the power amplifier board from the bottom chassis.

[Reference] Attaching the main board When attaching the screw M', attach the earth wire of the main board at the same time. When attaching the screw L, also attach the wire holder together with it.

Removing the power amplifier board

(See Fig. 13.)

Remove the top lens. Remove the bottom panel. Remove the top panel. Remove the CD&Video CD mechanism assembly.

1.2.Disconnect the wires from connectors CN192 and CN193 on the power amplifier board.

Remove the two screws Q attaching the fan motor.

[Reference] It is not necessary to remove the wire from the fan motor.

3.4.Remove the two screws R attaching the power amplifier board.

Lift the power amplifier board, disengage the two hooks e from the heat sink of the main board and take out the power amplifier board.

Rear panel

Main board

Fig.11

Fig.12

CN192

CN193

Power amplifier board

Fig.13

Hook e

Fan motor

Heat sink

Q Q

1-8

Removing the power transformer

(See Fig. 14.)

VS-DT88V

Remove the top lens. Remove the bottom panel. Remove the top panel. Remove the CD&Video CD mechanism assembly.

Disengage the wire clamp and tie band bundling the wires of the power transformer.

Disconnect the wire from connector CN192 on the power amplifier board.

Disconnect the wires from connectors CN191 and CN194 on the main board.

Remove the two screws S and two washers attaching the power transformer.

[Reference] After connecting the wires, bundling them using a wire clamp and tie band.

Main board

Treat the wire from the fan motor.

Fan motor

Tie band

Wire clamp

CN191

CN194

CN192

CN181

Power amplifier board

Fig.14

Power transformer

Washers

Fan motor

Removing the fan motor

(See Figs. 14 and 15.)

Remove the top lens. Remove the bottom panel. Remove the top panel. Remove the CD&Video CD mechanism assembly. Remove the front panel assembly.

1.2.Disconnect the wire from connector CN181 on the main board. (See Fig.14.)

From the right side of the main body, remove the two screws Q attaching the fan motor. (See Fig.15.)

[Reference] After mounting the fan motor, treat the wire from the fan motor as shown in fig. 14.

Bottom chassis

Fig.15

1-9

VS-DT88V

Remove the top lens. Remove the bottom panel. Remove the top panel. Remove the CD&Video CD mechanism assembly. Remove the front panel assembly.

Removing the switch board

(See Fig. 16.)

From the back side of the front panel assembly, remove the four screws T attaching the switch board.

Removing the open/close board

(See Figs. 16 and 17.)

1.2.From the back side of the front panel assembly, remove the two screws U attaching the door motor assembly.

Remove the screw V attaching the open/close board of the door motor assembly.

Removing the door motor (See Fig. 16.)

Remove the door motor assembly.

Remove the washers attaching the clutch assembly and gear 2.

Remove the clutch assembly and Gear 2.

Door motor assembly

Clutch assembly

Washer

Gear 2

Front panel assembly (Back side)

Switch board

Front panel assembly (Back side)

Fig.16

Door motor

Open/close board

Door motor assembly

Fig.17

Rod gear assembly

Remove the two screws W attaching the door motor.

Removing the front board

(See Figs. 18 to 21.)

While widening section f of the front base in the direction of the arrow, remove the rod gear assembly. (See Fig.18.)

Slide the moving panel assembly all the way in the direction of the arrow. (See Fig.18.)

While slightly widening sections g toward the front, take out the moving panel assembly in the direction of the arrow. (See Fig.19.)

Remove the two screws X attaching the moving base of the moving panel assembly. (See Fig.20.)

Disengage the engagement sections h on the inside of the moving base and at the inside of the moving panel assembly and remove the moving base. (See Fig.20.)

Remove the screw Y and screw Y' attaching the front board. (See Fig.21.)

Disengage the claws i of the moving panel and remove the front board. (See Fig.21.)

[Reference] Before attaching the moving base, pass the card wire of the front board through the hole on the moving base. (See Fig.20.) When attaching the screw Y', attach the wire at the same time.

Fig.18

Fig.19

Fig.20

Fig.21

Front base

Moving panel assembly

Hole

Front base

Moving base

Front board

Moving panel

Card wire

Wire

1-10

VS-DT88V

<CD&Video CD mechanism assembly section>

Removing the LED board (See Fig. 1.)

From the top side of the CD&Video CD mechanism assembly, disengage the claw a of the top chassis attaching the LED board and then remove the LED board.

Removing the CD&Video CD

mechanism assembly (See Fig. 2.)

From the back side of the CD&Video CD

1. mechanism assembly, raise the protector in the direction of arrow.

Remove the three screws A attaching the

2. CD&Video CD mechanism assembly on the top chassis and then remove the CD&Video CD mechanism assembly.

Removing the CD servo board and

video board (See Fig. 3.)

[Caution] Be sure to solder the short land section b on the flexible wire before disconnecting the flexible wire from connector CN601 on the CD servo board. If the flexible wire is disconnected without attaching solder, the pickup unit may be destroyed by static electricity.

From the back side of the CD&Video CD mechanism assembly, attach solder to the short land section b of the flexible wire that is connected to the connector CN601 of the CD servo board.

Claw a

Protector

LED board

Top chassis

Fig.1

CD&Video CD mechanism assembly

Top chassis

Fig.2

Disconnect the flexible wire from connector CN601 on the CD servo board.

Disconnect the card wires from connectors CN611, CN612, CN691 and CN692 on the CD servo board.

Remove the two screws B attaching the CD servo board.

Lift the front edge of the CD servo board slightly and disengage it from the projection c and then from the engagement section d.

[Caution] In the assembly, be sure to remove solder from the short land section b after connecting the flexible wire.

6.7.From the back side of the CD&Video CD mechanism assembly, disconnect the card wires from connectors CN101 and CN102 on the video board.

Remove the two screws C attaching the video board and then remove the video board.

Flexible wire

Projection c

Short land section b

CN612

CN601

CN691

CN611

CN692

CD servo board

Engagement section d

CN102

CN101

Video board

Fig.3

1-11

+ 25 hidden pages

JVC VS-DT88V Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Preventing static electricity

Important for laser products

Disassembly method