JVC RCBX-30 Service manual

SERVICE MANUAL

CD PORTABLE SYSTEM

RC-BX30

Area suffix

UJ --------------------- U.S.Military

RC-BX30

Contents

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

1-2 1-3 1-4 1-5 1-14 1-17

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

1-18 1-19 1-19 1-20 1-22

No.21171

Dec. 2002

RC-BX30

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-BX30

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

1. 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

2. 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.

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.

3.

Handle the flexible wire 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.

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 flexible wire is removed from the CD servo board. (If the flexible wire is disconnected without applying solder, the CD pickup unit may be destroyed by static electricity.) In the assembly, be sure to remove solder from the short land after connecting the fiexible wire.

Short land

Fiexible wire

CD pickup unit

1-3

RC-BX30

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

RC-BX30

Disassembly method

Removing the handle (See Fig. 1.)

Open the CD door.

1.

Lift the handle slightly.

2.

While pressing the claws a of the rear cabinet

3. 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 4.)

1.

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

Handle

Claw a

A

CD door

Claw a

11

2

Rear cabinet assembly

Fig.1

A

2.

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

3.

Slide the lower part of the front cabinet assembly slightly in the direction of the arrow 1. (See Fig.3.)

4.

While removing the front cabinet assembly from the cassette knobs and remove it in the upward direction 2. (See Fig.3.)

5.

Disconnect the speaker wire from the connector CN401 on the main board. (See Fig.4.)

Main board

CN401

Rear cabinet assembly

A

Front cabinet assembly

2

A

Fig.2

Rear cabinet assembly

Front cabinet assembly

1

Cassette knobs

Fig.3Fig.4

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RC-BX30

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

Removing the right and left speaker

assemblies (See Fig. 5.)

1.

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

2.

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

3.

Take out the right and left speaker assemblies.

Right speaker assembly

B

Soldered section b

Front cabinet assembly

B

Left speaker assembly

B

Speaker wires

Soldered section b

B

[Note]

When attaching the screws B, apply a locking agent to the screws B.

Removing the cassette door gear

assembly (See Fig. 6.)

1.2.From the inside of the front cabinet assembly, remove the two screws C retaining the cassette door gear assembly.

Take out the cassette door gear assembly.

[Note]

When attaching the screws C, apply a locking agent to the screws C.

Removing the cassette door

(See Fig. 7.)

Prior to performing the following procedures, remove the cassette door gear assembly.

Section c

Fig.5

C

Front cabinet assembly

Cassette door gear assembly

C

Fig.6

1.2.While pressing the section c of the cassette door in the direction of the arrow, remove the boss d of the cassette door from the section e of the front cabinet assembly.

Disengage the boss f of the cassette door from the section g of the front cabinet assembly.

[Note]

1-6

Be sure to hang the spring to the section h before attaching the cassette door to the front cabinet assembly.

Boss d

Section e

Fig.7

Spring

Cassette door

Section h

Section g

Boss f

RC-BX30

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

Removing the tuner board

(See Figs. 8 to 10.)

1.

From the rear side of the rear cabinet assembly, remove the screw D retaining the FM antenna.

(See Fig.8.)

2.

Pull out the band and fine tune knobs from the tuner board. (See Fig.9.)

3.

Disconnect the wire from the connector CN101 on the tuner board. (See Fig.9.)

4.

Remove the screw E and two screws F retaining the tuner board. (See Fig.9.)

5.

Take out the tuner board, then remove the screw G retaining the antenna connector plate. (See Fig.10.)

Rear cabinet assembly

D

CN101

F

FM antenna

Fig.8

Band knob

Tuner board

Fine tune knob

F

[Note]

When attaching the screws G, apply a locking agent to the screws G.

Removing the main board

(See Figs. 9 and 11.)

1.

Disconnect the wire from the connector CN101 on the tuner board. (See Fig.9.)

2.

Pull out the volume, DBB and function knobs from the main board. (See Fig.11.)

3.

Disconnect the wires from the connectors CN302, CN303 and CN501 on the main board.

(See Fig.11.)

4.

Remove the solders from the soldered section i connecting the wires to the main board.

(See Fig.11.)

5.

Remove the three screws H retaining the main board. (See Fig.11.)

Rear cabinet assembly

Volume knob

Main board

DBB knob

Fig.9

Fig.10

H

FM antenna wire

Antenna connector plate

G

FM antenna wire

Tuner board

Function knob

Rear cabinet assembly

CN302

H

Soldered section i

CN303

CN501

Fig.11

1-7

RC-BX30

Removing the cassette deck/CD

mechanism assembly

(See Figs.12 and 13.)

1.

From the rear side of the rear cabinet assembly, remove the two screws J retaining the cassette deck/CD mechanism assembly. (See Fig.12.)

2.

Disconnect the wires from the connectors CN302, CN303 and CN501 on the main board.

(See Fig.13.)

3.

Remove the two screws K retaining the cassette deck/CD mechanism assembly. (See Fig.13.)

[Note]

When attaching the screws K, apply a locking agent to the screws K.

Removing the display board

(See Figs.14 and 15.)

1.

From the bottom side of the CD mechanism assembly, remove the tie bands bundling the wires from the CD mechanism assembly. (See Fig.14.)

CN302

CN303

J

Fig.12

Cassette deck/CD mechanism assembly

Rear cabinet assembly

2.

Disconnect the wires from the connectors BC01, BC02 and BC03 on the CD servo board.

(See Fig.14.)

3.

Remove the solders from the soldered section j connecting the wires to the micro switch board.

(See Fig.14.)

4.

Remove the two screws L retaining the display board. (See Fig.15.)

5.

Press the claws k in the direction of the arrow, remove the display board. (See Fig.15.)

Cassette desk mechanism assembly

Display board

Claws k

CN501

Rear cabinet assembly

Fig.13

BC03Tie bands

K

Tie band

CD mechanism assembly

Micro switch board

1-8

Soldered section j

BC01

L

BC02

Fig.14Fig.15

CD servo board

RC-BX30

Removing the cassette board

(See Fig. 16.)

1.

From the back side of the cassette deck mechanism assembly, remove the tie band bundling the wires.

2.

Remove the solders from the soldered section m connecting the wires of the capstan motor and leaf switch.

3.

Remove the four screws M retaining the cassette board.

4.

From the reverse side of the cassette board, remove the solders from the soldered section n connecting the wires of the REC/PB head.

Removing the cassette deck mechanism assembly (See Fig. 17.)

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

1.

Remove the solders from the soldered section p connecting the wires of the leaf switch.

Soldered section n

M

Cassette board

M

Tie band

Soldered section m

Cassette deck mechanism assembly

Fig.16

2.

Remove the solders from the soldered section q connecting the wires of the REC/PB head.

3.

Remove the two screws N retaining the cassette deck mechanism assembly.

[Note]

When attaching the screws N, apply a locking agent to the screws N.

N

Cassette board

Wires (Leaf switch)

Wires (REC/PB head)

Cassette board

Soldered section q

Soldered section p

Cassette board

Cassette deck mechanism assembly

Fig.17

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RC-BX30

Removing the power transformer

(See Figs.18 to 20.)

Prior to performing the following procedures, remove the main board and cassette deck/CD mechanism assembly.

1.

From the rear side of the rear cabinet assembly, remove the battery door. (See Fig.18.)

2.

Remove the two screws P retaining the voltage selector switch. (See Fig.18.)

3.

From the inside of the rear cabinet assembly, remove the three screws Q retaining the cassette deck bracket. (See Fig.19.)

4.

Remove the solders from the soldered section r and s connecting the wires(red and black).

(See Fig.19.)

5.

Remove the two screws R retaining the power transformer. (See Fig.20.)

6.

Remove the two screws S retaining the socket cover. (See Fig.20.)

Rear cabinet assembly

Voltage selector switch

P

Battery door

Fig.18

Rear cabinet assembly

7.

Take out the power transformer together the socket cover and voltage selector switch.

[Note]

When attaching the screws P and R, apply a locking agent to the screws P and R.

Socket cover

R

Cassette deck bracket

Fig.19

S

P

Wire (red)

Soldered

section r

Voltage selector switch

1-10

Power transformer

Soldered section s

Wire (black)

Fig.20

RC-BX30

Removing the CD mechanism assembly (See Fig. 21.)

Prior to performing the following procedures, remove the cassette deck/CD mechanism assembly. (See Figs.12 and 13.)

1.2.From the bottom side of the cassette deck/CD mechanism assembly, disconnect the wires from the connectors BC01, BC02 and BC03 on the CD servo board.

Remove the four screws T retaining the CD mechanism assembly.

[Note]

When replacing the CD mechanism assembly, be sure not to mistake the positions of the pink and orange rubbers.

Rubber (oranmge)

Removing the micro switch board

(See Fig. 22.)

1.2.From the bottom side of the cassette deck/CD mechanism assembly, remove the solders from the soldered section t connecting the wires.

Rubber (orange)

T

Soldered section t

BC03

BC01

CD mechanism assembly

BC02

Fig.21

Cassette deck mechanism assembly

Rubber (pink)

T

Rubber (pink)

Micro switch board

Remove the screw U retaining the micro switch board.

Removing the CD gear assembly

(See Fig. 23.)

1.2.From the bottom side of the cassette deck/CD mechanism assembly, remove the two screws V retaining the CD gear assembly.

Take out the CD gear assembly.

Removing the CD door (See Fig. 23.)

1.

Open the CD door.

2.

While pressing the arm section u of the CD door in the direction of the arrow, remove the arm section u.

3.

Disengage the arm section v of the CD door, remove the CD door.

Cassette deck/CD mechanism assembly

CD door

Arm section v

U

V

CD gear assembly

Fig.22

Section w

Spring

Arm section u

[Note]

When attaching the CD door, hang the spring to the section w of the CD door.

Fig.23

1-11

RC-BX30

Removing the CD pickup unit

(See Figs. 1 to 3.)

Prior to performing the following procedures, remove the CD mechanism assembly.

1.

Remove the three screws A retaining the CD pickup cover. (See Fig.1.)

2.

Remove the slit washer retaining the feed middle gear and take out the feed middle gear. (See Fig.2.)

3.

Loosen the two screws B retaining the shaft and pull out the shaft in the direction of the arrow.

(See Fig.2.)

4.

Take out the CD pickup unit.

[Caution]

Be sure to apply the solder in order to the short land section a on the CD pickup unit before removing the flexible wire from the CD pickup unit.

(See Fig.2.) If the flexible wire is disconnected without apply this solder, the CD pickup may be damaged.

A

CD pickup unit

A

CD mechanism assembly

Pickup cover

Fig.1

Short land section a

A

5.From the bottom side of the CD mechanism assembly, remove the solders of the flexible wire from the soldered section b on the CD servo board.

[Caution]

[Note]

After re-connecting the flexible wire, be sure to remove the solder from the short land section a.

In the assembly, be sure to attach the sliding spring in the correct orientation before attaching the CD pickup unit.

(See Fig.2.)

Sliding spring

B

Feed middle gear

Fig.2

CD pickup unit

Slit washer

Soldered section b

B

Shaft

1-12

CD servo board

Fig.3

RC-BX30

Prior to performing the following procedures, remove the cassette deck mechanism assembly from the rear cabinet assembly. (See Fig.17 of "Rear cabinet section" on page 1-9.)

Removing the capstan motor

(See Figs.1 and 2.)

1.

Remove the capstan motor belt.

2.

Remove the two screws A retaining the bracket of the capstan motor from the cassette deck mechanism assembly.

3.

Remove the two screws B retaining the bracket from the capstan motor. (See Fig.2.)

Removing the leaf switch (See Fig.3.)

Pressing the claw a of the leaf switch in the direction of the arrow 1 and take out the leaf switch in the direction of the arrow 2.

Removing the pinch roller arm assembly (See Fig.4.)

Remove the screw C retaining the pinch roller arm assembly and remove the pinch roller arm assembly in an upward direction.

[Note]

Remove the screw D retaining the erase head and remove the erase head in an upward direction.

Remove the screw E, washer and screw F retaining the REC/PB head and remove the REC/PB head.

[Notes]

1.

From the bottom side of the cassette deck mechanism assembly, remove the main belt.

In the assembly, hang the notch b of the pinch roller arm assembly to the spring.

Removing the erase head

(See Fig.4.)

Removing the REC/PB head

(See Fig.4.)

When removing or replacing the REC/PB head, perform the REC/PB head adjustment. (See "Adjustment method".) After adjusting the REC/PB head, apply

a locking agent to the screws E and F.

Removing the flywheel assembly

(See Figs. 4 and 5.)

Capstan motor

Capstan motor belt

Flywheel assembly

Leaf switch

REC/PB head

D

Erase head

Washer

Cassette deck mechanism assembly

A

Fig.1

Capstan motor

Bracket

B

Fig.2

2

1

Claw a

Fig.3

Flywheel assembly

Notch b

Spring

Shaft

Main belt

FE

Fig.4

Slit washer

C

Pinch roller arm assembly

2.

From the top side of the cassette mechanism assembly, remove the slit washer retaining the shaft of the flywheel assembly.

3.

Pull out the flywheel assembly in the direction of the arrow. (See Fig.5.)

Cassette deck mechanism assembly

Main belt

Flywheel assembly

Fig.5

1-13

RC-BX30

Adjustment method

Measuring instructions required for adjustment

1. AM signal generator

2. FM signal generator

3. Inter mediate frequency sweep generator

4. FM stereo signal generator

5. Low-frequency oscillator (oscillation frequency 50Hz-20kHz, 0dB output with 600 ohm impedance)

6. Attenuator (600 ohm impedance)

7. Electronic voltmeter

8. Distortion meter

9. Torque gauge (cassette for CTG-N)

10. Wow & flutter meter

11. Frequency counter meter

12. Test tape VT712 : For tape speed and wow flutter VT724 : For reference level VT702 : For playback frequency VT702 : For head azimuth adjustment

13. Blank tape TAPE : AC-225

Measuring instruments

Radio section FM 1kHz, 22.5kHz deviation FM STEREO : 1kHz, 67.5kHz deviation pilot signal 7.5kHz AM : 1kHz, 30% modulation Reference output : Speaker output 0dBs (0.447V)/4 ohm H.phone output -10dBs (0.245V)/32 ohm Standard position of function switch : Selects FM in tuner mode Bass boost: OFF Main volume: Reference output

Amplifier section Reference output : Speaker output 0dBs (0.447V)/4 ohm H.phone output -10dBs (0.245V)/32 ohm Standard position of function switch : Selects TAPE mode

CD section CD test disc : CTS-1000

Measurement conditions

Power supply voltage AC110V-127V/210V-230V (60Hz/50Hz)

1-14

Cassette amplifier section

Item Measuring condition Check and adjustment procedure Standard value Adjusting part

Head azimuth adjustment

Tape speed and wow/flutter check and adjustment

PB frequency response check

Bias frequency check

REC and PB frequency response adjustment

Test tape: VT702 (8kHz) Signal output terminal: PHONES (with 32 ohm load)

Test tape: VT712 (3kHz) Signal output terminal: PHONES (with 32 ohm load)

Test tape: VT702 Signal output terminal: PHONES (with 32 ohm load) Tape: Normal Signal output terminal: Cassette REC./PLAY HEAD

Test tape: AC225 Signal input: FM22.5 DEV 60dBu with emphasis Signal output terminal: PHONES (with 32 ohm load)

Play back the test tape VT702 (8kHz).

1. Adjust the head azimuth adjusting screw so that the

2. phase difference between the R and L channels is minimized at an output level that is within (+2dB-2dB) of the maximum output level in the FWD and REV operations. After this adjustment, lock the head azimuth adjusting screw with screw sealant to cover more than a half of the screw head. When the head azimuth is maladjusted, correct it with

3. the head azimuth adjusting screw in the FWD and REV operations alternately. Play back the test tape VT712 (3kHz) by the end

1. portion. Connect a frequency counter and check that it reads

2. between 2940 and 3090Hz. If not, adjust the frequency with the motor semifixed resistor. Check that the wow/flutter is within 0.38%

3. (unweighted).

Play back the test tape VT702 while con-firming that deviation between the 1kHz signal and 8kHz signal should be 0(+3dB~-6)dB.

Set the FUNCTION switch to TAPE and the record and play tape mechanism, check to see if the frequency at the measuring point is (80kHz+2kHz

-2kHz) if not adjust L201 until the frequency counter indicates (80kHz+2kHz-2kHz). Set the FUNCTION switch to the radio position, set the BAND switch to the FM position, and record the reference 1kHz signal and 8kHz signal alternately repeatedly. While playing back the recorded signal differ from that of the 1kHz signal by within 0 (+3~

-6)dB.

Output level: Within (+2dB-2dB) of maximum output level Phase difference R and L channels: Minimum

2940 to 3090Hz

Within 0.38% (unweighted)

Deviation between 1kHz and 8kHz: 0(+3dB~-6)dB

Level difference between REC and PB: Within 0 (+3~-6)dB

RC-BX30

Head azimuth adjusting screw (To be used only after head replacement) See Fig.1 on page 1-16.

Tape speed: Motor semifixed resistor

See Fig.2 on page 1-16. Check only

L201 See Fig.4 on page 1-16.

Tuner section

Item Measuring condition Check and adjustment procedure Standard value Adjusting part

MW/SW IF adjustment

FM IF adjustment

SW tracking adjustment

Signal input: Loop ANTENNA Signal output: IC101 pin19 Signal input: FMANT, FMGND Signal output: IC101 pin19 Signal input: Dummy antenna ANT GND Signal output: PHONES (with 32 ohm load)

Set the intermediate frequency sweep generator to

1. MW/SW 455kHz. Adjust the T102 for maximum and center output.

2.

Set the intermediate frequency sweep generator to

1. FM (10.7MHz). Adjust the T101, T103 for maximum and center

2. output. Set the dial at low end, set the S/G at (5.75MHz

1. +0.4MHz-0.4MHz). Adjust the L104, check to see the output is maximum. Set the dial at high end, set the S/G at (17.8MHz

2. +0.5MHz-0.5MHz). Adjust the VC101, check to see the output is maximum. Set the dial while receiving a 7MHz signal from S/G at

3. maximum. Adjust the L101, check to see the output is maximum.

T102 See Fig.3 on page 1-16.

T101, T103 See Fig.3 on page 1-16.

L104

VC101

L101 See Fig.3 on page 1-16.

1-15

RC-BX30

Tuner section

Item Measuring condition Check and adjustment procedure Standard value Adjusting part

FM tracking adjustment

MW tracking adjustment

Signal input: Dummy antenna ANT GND Signal output: PHONES (with 32 ohm load)

Signal input: Loop antenna Signal output: PHONES (with 32 ohm load)

Set the dial at low end, set the FM signal generator at

1. (87.35MHz+0.2MHz-0.2MHz). Adjust the L107, check to see the output is maximum. Set the dial at high end, set the FM signal generator

2. at (108.25MHz+0.25MHz-0.25MHz). Adjust the PVC11-C2, check to see the output is maximum. Set the dial while receiving a 90MHz signal from an

3. FM signal generator at maximum. Adjust the L106 for maximum output. Set the dial while receiving a 106MHz signal from an

4. FM signal generator at maximum. Adjust the PVC11

-C1 for maximum output. Repeat the adjustment of the above steps 3 and 4.

5. Set the dial at low end, set the S/G at (515kHz+5kHz

1.

-5kz). Adjust the L105, check to see the output is maximum. Set the dial at high end, set the S/G at (1620kHz

2. +15kHz-15kHz). Adjust the PVC11-C4, check to see the output is maximum. Set the dial while receiving a 600kHz signal from an

3. AM signal generator at maximum. Adjust the AM ANT COIL L102 for maximum output. Set the dial while receiving a 1400kHz signal from an

4. AM signal generator at maximum. Adjust the PVC11

-C3 for maximum output. Repeat the adjustment of the above steps 3 and 4.

5.

L107

PVC11-C2

L106

PVC11-C1 See Fig.3 on page 1-16.

L105

PVC11-C4

L102

PVC11-C3 See Fig.3 on page 1-16.

Location of adjusting parts

Cassette mechanism section

(Caution) For adjusting any head, be sure to use a screw driver degaussed.

Adjustment

Head

max

Azimuth adjustment screw

Fig.1 Head output signal

Tuner board

CASSETTE MOTOR

Tape Speed Adj.

Cassette board

Fig.2

(Bias Frequency Adj.)

L201

1-16

1

IICC11001

Fig.3 Fig.4

Trouble shooting

RC-BX30

Circuit Symptom Cause

General

MW

SW

No sound

No sound, weak sound (Low sensitivity)

Speakers are not connected.

Wrong function is selected.

Defective volume control

Defective earphone jack

Improper location of unit

Defect in IFT102

Defect MW antenna coil L102 or oscilloscope coil L105

Intermediate frequency tuning faulty

MW tracking faulty

Defective IC101

Defective Q101, Q102, Q103, Q104, Q105

SW antenna not connected

Defect in IFT102

Defect SW antenna coil or oscilloscope coil

Remedy

Check the speaker connection

Set switch to the proper position.

Set the volume control to a proper sound level.

Replace the earphone jack.

Rotate or reposition the unit.

Check resistance, voltage and current. Replace as needed.

Replace if necessary.

Readjust (see "Adjustment method").

Check voltages. Replace if necessary.

Connect the built-in external antenna

Check resistance, voltage and current. Replace as needed.

Replace if necessary.

FM

Tape

CD

No sound, weak sound (Low sensitivity)

No sound/recording, unsteady tape sound, weak sound

Cannot read the table of content. No display, no sound

Intermediate frequency tuning faulty

SW tracking faulty

Defective IC101

Defective Q101, Q102, Q103, Q104, Q105

FM antenna not connected

Defective band selector switch

Defective IC101

Intermediate frequency tuning faulty

Poor contact in FM antenna circuit

Dirty capstan or head

Irregular cassette tape winding

Defective IC201

Cassette erasure prevention tabs broken out

Disc is inserted upside down.

Disc is dirty.

Disc is scratched.

Readjust (see "Adjustment method").

Check voltages. Replace if necessary.

Connect the built-in external antenna

Replace or repair the switch

Check voltages. Replace if necessary.

Readjust (see "Adjustment method").

Resolder or repair as required.

Clean the capstan or head with alcohol.

Replace tape.

Check voltages. Replace if necessary.

Replace tape or cover tab openings with adhesive tape.

Insert disc correctly.

Wipe clean with a soft cloth.

Use a new disc.

Disc is seriously warped.

A non-standard disc has been inserted.

Moisture has formed inside the CD deck.

Defect in the servo control board

Defect in the CD pickup mechanism

Use a new disc.

Use only a brand name disc.

Wait about 20 to 30 minutes.

Replace or repair as required.

Replace as required.

1-17

RC-BX30

Flow of functional operation until TOC read

Power ON

Slider turns REST SW ON.

Laser ON

Focus start

FOK

Turn on focus servo

Disc spinning

Radial_error scaling

PLL Lock

Turn on radial servo

Read TOC

1-18

RC-BX30

Maintenance of laser pickup

(1) Cleaning the pick up lens Before you replace the pick up, please try to clean the lens with a alcohol soaked cotton swab.

(2) Life of the laser diode When the life of the laser diode has expired, the following symptoms will appear.

The level of RF output (EFM output:ampli tude of eye pattern) will below.

Is the level of

RF OUT under

1.25V 0.22Vp-p?

YES

O.K

NO

Replace it.

Replacement of laser pickup

Turn off the power switch and,disconnect the power cord from the AC OUTLET.

Replace the pickup with a normal one.(Refer to "Removing the CD pickup" on the previous page)

Plug the power cord in,and turn the power on. At this time,check that the laser emits for about 3 seconds and the objective lens moves up and down. Note: Do not observe the laser beam directly.

Play a disc.

Check the eye-pattern at the "RF" test point.

Finish.

(3) Semi-fixed resistor on the APC PC board The semi-fixed resistor on the APC printed circuit board which is attached to the pickup is used to adjust the laser power. Since this adjustment should be performed to match the characteristics of the whole optical block, do not touch the semi-fixed resistor. If the laser power is lower than the specified value,the laser diode is almost worn out, and the laser pickup should be replaced. If the semi-fixed resistor would be adjusted when the pickup operates normally,the laser pickup may be damaged due to excessive current.

1-19

RC-BX30

Description of major ICs

AN7312 (IC201) : Dual recording/Playback pre-amplifier circuit with ALC

1. Terminal layout

1 2 3 4 5 6 7

3. Pin function

14 13 12 11 10

9 8

2. Block diagram

Vcc

14 13 12 11 10

Ripple Filter

ALC

1 2 3 4 5 6

GND

Amp.

Ch2

Amp.

Ch1

9

8

7

Pin No. Symbol Function

1

GND

2

ALC time constant

3

ALC input Ch.1

4

Output Ch.1

5

Phase compensation Ch.1

6

N.E.B. Ch.1

7

Input Ch.1

8

Input Ch.2

9

N.E.B. Ch.2

10

Phase compensation Ch.2

11

Output Ch.2

12

ALC input Ch.2

13

Ripple filter

14

Vcc

I/O

GND

ALC time constant by resistance and capacitor

Right channel ALC input

I

Right channel output

O

Not connect

Right channel negative feed back input

I

Right channel signal input

I

Left channel signal input

I

Left channel negative feed back input

I

Not connect

Left channel output

O

Left channel ALC input

I

Ripple filter

Power supply

-

LA1824 (IC101) : Tuner

1. Terminal layout & Block diagram

24 23 22 21

FM RF

CND2

Vcc2

20 19 18 17

FM

OSC

16 15 14 13

DECODER

PHASE

COMP

DET

1-20

AM

RF

FM

MIX

AM

MIX

REG

1

AM

OSC

Vcc1

2 3 4 5 6 7 8

TRIG ST-SW VCO FF FF FF

GND1

TUN LED

ST

LED

9 10 11 12

S-METER

FM-IF

PILOT

AGCDET

AM-IF

TA8227P (IC401) : Amplifier

1. Terminal layout 2. Block diagram

SDBY

ROUT

RBS

SGND

RNF

RIN

1

2

3

13

4

5

6

12

VC

11

LOUT

10

LBS

RIN

RNF

6

45

5

W

14

9

RIP

8

LNF

7

LIN

Bias Circuit

9 4

RIP

Thermal Shut Down Protection Circuit

7

LIN

45

LNF

8

W

SDBY VC

1 12

CH-1

30k

W

CH-2

30k

W

11

10

3

2

RC-BX30

RBS

ROUT

S-GND

LOUT

LBS

MC14094 (IC601) : XXXXX

1. Terminal layout

STR

CP

OP0

OP1

OP2

OP3

GND

1

2

0

3

4

5

6

7

8

16

VCC

15

CE

14

OP4

13

OP5

12

OP6

11

OP7

10

OS2

9

OS1

pre-GND

1-21

1-22

RC-BX30

Wiring connection

SPEAKER L SPEAKER R

Power transformer

AC INPUT POWER SELECT SWITCH

(Voltage selector switch)

6

110-127V 220-230V

BATT-

DECK HEAD

(REC/PB head)

BATT+

4

Main board

OW20-42042-16K

(Forward side)

14

CN302

R CH L CH

14

CN401

4

6

10

CN303CN501

6

1

4

1

10

9

1

4

Tuner board

(Forward side)

1

OW20-42042-09K

1

0

2

AC SOCKET

2

0

3

1

1614

4

10

6

1

CD MODULE

(CD servo board)

1

10

1

5

2

0

49

16

Cassette board

(Forward side)

0

2

Display board

13

(Forward side)

1

5

0

Color codes are shown below.

1

BROWN

2

9

4

02

RED

3

ORANGE

4

YELLOW

5

GREEN

6

BLUE

7

VIOLET

8

GREY

9

WHITE

0

BLACK

OW20-41032-06K

Micro switch board

(Forward side)

RC-BX30 UJ VERSION

SCHEMATIC DIAGRAMS

CD PORTABLE SYSTEM

RC-BX30

CD-ROM No.SML200212

Area suffix

UJ --------------------- U.S.Military

RC-BX30

Contents

Block diagram Standard schematic diagrams Printed circuit boards

2-1 2-2 2-8 11

No.21171SCH

Dec. 2002

RC-BX30

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.)

2-6

Block diagram

RC-BX30

ROD. ANT.

FM.

5

L1

MW

SW

1

24

16

IC101 LA1824

L103

2

FM RF/IF/MPX AM RF/IF/DET

Tuner board

17

CN101

Main board

CN301

7 11

IC401 TA8227P

POWER AMP.

4

5 7 10

T101

T102

CF101

11

CF102

CN302

CN501

6 2

CN401

3

CD player

CN201

SW201B

SW201D

4

CN203

IC201 AN7312

2

L-CH

R/P

HEAD

S

7

R/P SYSTEM

8 11

X

N

ERASE

HEAD

1

SW201A

Cassette board

AB CD E F G

2-1

Standard schematic diagrams

Main section

RC-BX30

From

11.1V9.12V

CD module

5

4.04V

9.13V

3.38V

10.6V

10.5V3.38V

3.9V

From

4

Tuner board CN101

2.27V

1.5V

0.93V

0V

0.59V

6.03V

10.7V

5.7V

11.1V

3

From Cassette board CN203

1.5V

2.3V

0.93V

0V

0.59V

10.6V

5.68V

11.02V

2

11.1V6.16V

6.76V

To Cassette board CN204

1

Main board

RADIO SIGNAL

TAPE PB SIGNAL

TAPE REC SIGNAL

Parts are safety assurance parts. When replacing those parts, make sure to use the specified one.

CD SIGNAL

MAIN SIGNAL

2-2

HAB C DE FG

RC-BX30

Tuner section

0V

5.4V

5

5.4V

To Main board CN301

3.13V

1.4V

0.7V

4

0V

5.44V

0.36V

1.26V

1.42V

1.4V

0.59V

3.64V

5.44V

1.28V

5.43V

5.44V

3

5.4V 5.4V

4.78V 5.4V

5.44V

4.8V

5.44V

0V

5.44V

0V

1.28V

0.5V

2

MW/SW SIGNAL

FM SIGNAL

RADIO SIGNAL

1

AB CD E F G

2-3

RC-BX30

Cassette section

To Main board

5

CN302

0V

2.67V

1.38V

1.26V

0V

4

0V

1.26V

1.38V

2.6V

0V

5.11V

5.15V

0V

3

6.1V

5.9V

0V

2

6.1V

6.08V

5.71V

TAPE REC SIGNAL

TAPE PB SIGNAL

To Main board CN303

Parts are safety assurance parts. When replacing those parts, make sure to use the specified one.

1

2-4

HAB C DE FG

RC-BX30

Display & Key section

5

5.0V

0.012V

4

0.012V

To Main board

3

0.4V

0.07V

0.012V

0.019V

0.5V

0.012V

0.18V

3.03V

2

Display & Key board

From CD module

CD SIGNAL

1

Micro switch board

AB CD E F G

2-5

RC-BX30

VICTOR COMPANY OF JAPAN, LIMITED

AUDIO & COMMUNICATION BUSINESS DIVISION PERSONAL & MOBILE NETWORK BUSINESS UNIT. 10-1,1Chome,Ohwatari-machi,maebashi-city,371-8543,Japan

No.21171SCH

200212

JVC RCBX-30 Service manual

Specifications and Main Features

Frequently Asked Questions

User Manual