JVC RC BM5 Service Manual

SERVICE MANUAL

CD PORTABLE SYSTEM

RC-BM5

Area suffix

RC-BM5

A ------------------------------- Australia US --------------------------- Singapore UJ -------------------------- U.S.Military

Contents

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

1-2 1-3 1-4 1-5 1-16 1-19

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

1-20 1-21 1-21 1-22 1-36,37

No.21132

Feb. 2003

RC-BM5

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

RC-BM5

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.

Apply solder to the short land before the card wire is disconnected from the connector on the main board. (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 card wire.

Short land

CD/Cassette mechanism assembly

Main board

CD pickup unit

Card wire

1-3

RC-BM5

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 när 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. Undgåudsættelse for stråling. ADVARSEL : Usynlig laserstråling ved åpning,når

sikkerhetsbryteren er avslott. unngå utsettelse

for stråling.

REPRODUCTION AND POSITION OF LABELS

CLASS 1

LASER PRODUCT

1-4

Disassembly method

RC-BM5

Removing the handle (See Fig. 1.)

Lift the handle slightly.

While pressing the claws a of the rear cabinet

2. assembly in the direction of the arrow 1, slide the handle in the direction of the arrow 2.

Removing the front cabinet assembly and rear cabinet assembly

(See Figs. 2 to 5.)

Remove the eight screws A retaining the front cabinet and rear cabinet assemblies from the rear of the main body. (See Fig.2.)

Open the cassette door. (See Fig.3.)

Remove the two screws B retaining the front cabinet assembly. (See Fig.3.)

Slide the lower part of the front cabinet slightly in the direction of the arrow 1. (See Fig.4.)

While removing the front cabinet assembly from the cassette knobs and remove it in the upward direction 2. (See Fig.4.)

Handle

Claw aClaw a

Fig.1

Rear cabinet assembly

Fig.2

Disconnect the speaker wire from the connector CN205 on the phone jack board. (See Fig.5.)

Disconnect the parallel wire from the connector CN302 on the main board. (See Fig.5.)

CN205

CN302

Phone jack board

Main board

Fig.5

Front cabinet assembly Cassette door

Fig.3

Front cabinet assembly

Fig.4

Cassette knobs

1-5

RC-BM5

Prior to performing the following procedures, remove the front cabinet assembly from the rear cabinet assembly.

Removing the display board

(See Fig. 6.)

From the inside of the front cabinet assembly, remove the eight screws C retaining the display board and then take out the display board.

Removing the right and left main

speaker assemblies (See Fig. 7.)

From the inside of the front cabinet assembly, remove the six screws D retaining the right and left main speaker assemblies.

Remove the solders from the soldered sections b and c of the right and left main speaker assemblies, remove the wires.

Take out the right and left main speaker assemblies.

Display board

Front cabinet assembly

Right main speaker

Front cabinet assembly

Fig.6

Left sub speaker

Soldered sections e

Left main speaker

[Note]

After assembly, apply a locking agent to the screws D.

Removing the right and left sub

speaker assemblies (See Fig. 7.)

From the inside of the front cabinet assembly, remove the four screws E retaining the right and left sub speaker assemblies.

Remove the solders from the soldered sections d and e of the right and left sub speaker assemblies, remove the wires.

Take out the right and left sub speaker assemblies.

[Note]

After assembly, apply a locking agent to the screws E.

Removing the cassette door damper

(See Fig. 8.)

1.2.From the inside of the front cabinet assembly, remove the two screws F retaining the bracket of the cassette door damper.

Soldered section b

Right sub speaker

Front cabinet assembly

Soldered sections d

Fig.7

Soldered section c

Take out the cassette door damper.

[Note]

1-6

After assembly, apply a locking agent to the screws F.

Cassette door damper Bracket

Fig.8

Removing the cassette door

(See Fig. 9.)

Open the cassette.

While pressing the claws f on the left and right of the cassette door bracket, slide the cassette door.

Disengage the hooks g and h on the left and right of the cassette door bracket, and remove the cassette door.

Removing the cassette door bracket

(See Figs. 10 and 11.)

While pressing the sections i on the left and right of the cassette door bracket in the direction of the arrow 1, remove the cassette door bracket from the bosses j of the front cabinet assembly and then open the cassette door bracket in the direction of the arrow 2. (See Fig.10.)

Section i

RC-BM5

Cassette door bracket

Cassette door

Hook h

Claw f

Hook g

Fig.9

Section i

Press the section k of the cassette door bracket and remove the cassette door bracket from the boss m of the front cabinet assembly. (See Fig.11.)

Disengage the section n of the cassette door bracket from the boss p of the front cabinet assembly and remove the cassette door bracket.

(See Fig.11.)

[Note]

Be sure to hang the spring to the section q before attaching the cassette door bracket. (See Fig.11.)

Boss j

Section n

Boss p

Spring

Section q

Fig.10

Fig.11

Boss j

Cassette door bracket

Section k

Boss m

Cassette door bracket

1-7

RC-BM5

Prior to performing the following procedures, remove the front cabinet assembly from the rear cabinet assembly.

Removing the volume switch board

(See Figs. 12 and 13.)

Disconnect the wire from the connector H402 on the volume switch board. (See Fig.12.)

Remove the four screws G retaining the control bracket of the volume switch board. (See Fig.12.)

While pressing the power and volume buttons of the volume switch board, take out the volume switch board.

From the forward side of the volume switch board, remove the five screws H retaining the volume switch board to the control bracket. (See Fig.13.)

From the bottom side of the control bracket, remove the two screws J retaining the volume switch board and volume button to the control bracket. (See Fig.13.)

Volume switch board

Control bracket

Volume switch board

H402

Fig.12

Volume button

(Bottom side)

Removing the power amplifier board

and phone jack board (See Fig. 14.)

Remove the tie band bundling the wires from the main board.

Disconnect the wire from the connector CN206 on the power amplifier board.

Disconnect the wire from the connector CN801 on the main board.

Remove the wire from the soldered section r on the power amplifier board.

Remove the two screws K and board holders (A)/(B) retaining the power amplifier board.

Remove the two screws L retaining the phone jack board.

Soldered section r

Phone jack board

L K

Board holder (A)

Notch s

Board holder (B)

CN206

Fig.13

Tie band

Fig.14

Main board

CN801

Power amplifier board

Notch t

Pull out the power amplifier board from notches s and t, and then take out the power amplifier board together the phone jack board.

1-8

RC-BM5

Removing the power transformer

(See Fig. 15.)

1.2.Remove the tie band bundling the wires from the power transformer and battery plate.

Remove the wire from the soldered section u on the power amplifier board.

[Reference]

Remove the wire(blue) from the soldered section v of the battery plate.

Remove the two screws M retaining the power transformer.

Remove the two screws N retaining the AC jack.

From the bottom side of the rear cabinet assembly, remove the label and then remove the two screws P retaining the voltage selector switch.

Take out the power transformer together the AC jack and voltage selector switch.

It is not necessary to remove the wire(black) from the battery plate.

(Except for A version)

Tie band

Wire(blue)

Soldered section u

AC jack

Wire(black)

Power transformer

Soldered section v

Nut

Put a mark here.

Nut

[Caution]

Voltage selector switch

P P

[Caution]

Label

AC220-230V

Make sure direction is correct.

Fig.15

Front side

AC110-127V

VOLTAGE SELECTOR

[Caution]

Before removing the voltage selector switch, put a mark on the voltage selector switch as shown in Fig.15. When reinstalling, attach the voltage selector switch in the same position as marked before removing. When affixing a label, make sure it is in the correct direction.

[Note]

After assembly, apply a locking agent to the screws M, N and nuts.

Removing the tuner board

(See Figs. 16 and 17.)

Remove the wire from the connector H801 on the tuner board. (See Fig.16.)

Remove the two screws Q and board holders (B) retaining the tuner board. (See Fig.16.)

Pull out the tuner board from the notches w and x of the rear cabinet assembly. (See Fig.16.)

H801

Board holder (B)

Notch w

Notch x

Tuner board

Board holder (B)

Fig.16

Remove the FM antenna wire from the soldered section y on the reverse side of the tuner board.

(See Fig.17.)

Soldered section y

Tuner board (Reverse side)

Fig.17

1-9

RC-BM5

Removing the cassette deck

mechanism assembly and cassette board (See Figs. 18 and 19.)

Remove the three screws R and screw R' retaining the cassette deck mechanism assembly.

(See Fig.18.)

Cassette deck mechanism assembly

Wire clamp

Lift the cassette deck mechanism assembly slightly and move it as shown in Fig.19.

Remove the three screws S retaining the cassette board. (See Fig.19.)

Lift the cassette board slightly, remove the capstan motor wire and REC/PB head wire from the soldered sections z and aa on the cassette board. (See Fig.19.)

From the forward side of the cassette board, disconnect the wire from the connector CN602 and then remove the cassette deck mechanism assembly. (See Fig.19.)

From the forward side of the cassette board, disconnect the wire from the connector H602 and then remove the cassette board. (See Fig.19.)

[Notes]

When attaching the screw R', attach the wire clamp at the same time.

(See Fig.18.) After assembly, apply a locking agent to the screws R and R'. (See Fig.18.)

Cassette deck mechanism assembly

CN602 (Forward side)

Fig.18

H602 (Forward side)

Soldered section aa

Cassette board

Soldered section z

1-10

Fig.19

RC-BM5

Removing the CD/Cassette mechanism

assembly

(See Figs. 12,14,16 and 20 to 22.)

[Reference]

From the back side of the rear cabinet assembly, remove the two screws T retaining the CD/Cassette mechanism assembly. (See Fig.20.)

Disconnect the wire from the connector H402 on the volume switch board. (See Fig.12.)

Disconnect the wire from the connector CN206 on the power amplifier board. (See Fig.14.)

Disconnect the wire from the connector CN801 on the main board. (See Fig.14.)

Disconnect the wire from the connector H801 on the tuner board. (See Fig.16.)

Remove the four screws U retaining the CD/Cassette mechanism assembly. (See Fig.21.)

It is not necessary to remove the cassette deck mechanism assembly from the rear cabinet assembly.

Rear cabinet assembly

Fig.20

Slide the CD/Cassette mechanism assembly in the direction of the arrow and take out it. (See Fig.22.)

CD/Cassette mechanism assembly

Fig.21

Rear cabinet assembly

CD/Cassette mechanism assembly

Fig.22

1-11

RC-BM5

Removing the main board

(See Figs. 23 to 25.)

[Caution]

From the bottom side of the CD/Cassette mechanism assembly, remove the screw V retaining the main board. (See Fig.23.)

Disconnect the wire from the connector H602 on the cassette board. (See Fig.23.)

Disconnect the wire from the connector H302 on the main board. (See Fig.24.)

From the top side of the CD/Cassette mechanism assembly, remove the three screws W and screw

W' retaining the main board. (See Fig.24.)

[Note]

Remove the main board from the CD/Cassette mechanism assembly, lift the CD/Cassette mechanism assembly as shown in Fig.25.

Disconnect the wire from the connector H502 on the main board. (See Fig.25.)

Apply solder to the short land section ab on the CD pickup unit. (See Fig.25.)

[Caution]

When removing the main board, be careful not to scratch or damage the CD door.

When attaching the screw W', attach the wire clamp at the same time.

Be sure to solder the short land section ab on the CD pickup unit before disconnecting the card wire from the CD pickup unit. (See Fig.25.) If the card wire is disconnected without applying solder, the CD pickup may be destroyed by static electricity.

Main board

CD/Cassette mechanism assembly

H602Cassette board

Fig.23

Fig.24

Main board

CD/Cassette mechanism assembly

Wire clamp

H302

CD pickup unit

8.After soldering, disconnect the card wire from the CD pickup unit and then remove the main board.

(See Fig.25.)

[Caution]

1-12

In the assembly, be sure to remove solder from the short land section ab on the CD pickup unit after connecting the card wire.

Short land section ab

Card wire

H502

Fig.25

+ 26 hidden pages

JVC RC BM5 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Preventing static electricity

Important for laser products

Disassembly method