JVC RCBZ-6 Service manual

SERVICE MANUAL

CD PORTABLE SYSTEM

RC-BZ5LB/BZ5RD

RC-BZ6BU

RC-BZ5LB/BZ5RD

RC-BZ6BU

REMOTE CONTROL RM-SRCBZ5

RC-BZ5LB/BZ5RD

REMOTE CONTROL RM-SRCBZ6

RC-BZ6BU

Contents

Safety precautions Importance administering point on the safety Preventing static electricity Important for laser products Disassembly method Adjustment method Description of major ICs

1-2 1-3 1-4 1-5 1-6 1-15 1-18

Areas suffix

J ---------------- U.S.A.

C ------------- Canada

Comparison table

Item Jog dial circuit Not used Used Back light (LCD) Not used Used Bass boost circuit Not used Used Power amplifier 14W 18W Electrical volume Not used Used

RC-BZ5LB/BZ5RD

RC-BZ6BU

No.20819

July. 2000

RC-BZ5LB/BZ5RD RC-BZ6BU

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 alter ations of the product should not be made. Any design alterations or additions will void the manufacturer`s warranty and will further relieve the manufacture of responsibility for personal injury or property damage resulting therefrom.

3. Many electrical and mechanical parts in the products have special safety-related characteristics.

These characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in the Parts List of Service Manual. Electrical components having such features are identified by shading on the schematics and by ( ) on the Parts List in the Service Manual. The use of a substitute replacement which does not have the same safety characteristics as the recommended replacement parts shown in the Parts List of Service Manual may create shock, fire, or other hazards.

4. The leads in the products are routed and dressed with ties, clamps, tubings, barriers and the like to be separated from live parts, high temperature parts, moving parts and/or sharp edges for the prevention of electric shock and fire hazard. When service is required, the original lead routing and dress should be observed, and it should be confirmed that they have been returned to normal, after re-assembling.

5. Leakage current check (Electrical shock hazard testing) After re-assembling the product, always perfor m 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, par ticularly any exposed metal part having a return path to the chassis, and measure the AC voltage across the resistor. Now reverse the plug in the AC outlet and repeat each measurement voltage measured any must not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.).

0.15 F AC TYPE

1500 10W

Good earth ground

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

Place this probe on each exposed metal part.

1-2

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.

Importance administering point on the safety

Power supply board

D902

D903

R998

CN307CN306

F903

D901

D904

F902

POWER TRANSFORMER

RC-BZ5LB/BZ5RD

RC-BZ6BU

F901

Not used

S901

For USA and Canada / pour Etats - Unis d' Amerique et Canada

Caution: For continued protection against risk of fire, replace only with same type 3A/125V for F902 and F903. This symbol specifies type of fast operating fuse.

Precaution: Pour eviter risques de feux, remplacez le fusible de surete de F902 et F903 comme le meme type que 3A/125V. Ce sont des fusibles suretes qui functionnes rapide.

1-3

RC-BZ5LB/BZ5RD RC-BZ6BU

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

1. In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement optical pickup are shorted. After replacement, return the shorted parts to their original condition. (Refer to the text.)

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

4.Handling the traverse unit (optical pickup)

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

2. Remove solder of the land on the flexible cable after replacing the optical pickup. For specific details, refer to the replacement procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to take too long a time when attaching it to the connector.

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

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

CD Pick up

Attention when traverse unit is decomposed

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

1.Short the land before the card wire is removed from connector on the Main board as shown in Figure. (When the wire is removed without putting up solder, the CD pick-up assembly might destroy.)

2.Please remove solder after connecting the card wire with when you install picking up in the substrate.

1-4

Land

Important for laser products

RC-BZ5LB/BZ5RD

RC-BZ6BU

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.

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.

REPRODUCTION AND POSITION OF LABELS

WARNING LABEL

CLASS 1 LASER PRODUCT

1-5

RC-BZ5LB/BZ5RD RC-BZ6BU

Disassembly method

Removing the front cabinet assembly /

rear cabinet assembly (See Fig.1 to 3)

Detach the battery cover on the back of the body. Remove the eight screws A attaching the front cabinet assembly and the rear cabinet assembly.

Press STOP / EJECT button on the upper side of the body to open the cassette door.

Remove the front cabinet assembly toward the front and pull out the volume knob at the same time.

Disconnect the speaker harness from connector CN309 on the main board in the rear cabinet assembly.

Front cabinet assembly

Battery cover

Fig.1

Rear cabinet assembly

STOP / EJECT button

assembly /

Cassette door

Volume knob

Fig.2

Rear cabinet assembly

1-6

Main board

CN309

Front cabinet assembly

Fig.3

RC-BZ5LB/BZ5RD

RC-BZ6BU

Removing the speaker (L) and (R)

(See Fig.4)

Prior to performing the following procedure, remove the front cabinet assembly.

Remove the eight screws B in the front cabinet.

Removing the cassette door

(See Fig.5 and 6)

Prior to performing the following procedure, remove the front cabinet assembly.

Remove the door spring in the front cabinet assembly.

Insert a screwdriver between the door arm and the front cabinet and slide the door arms inward, then detach the cassette door from the front cabinet.

Speaker (L)

Speaker (R)

Fig.4

Door arms

Reattaching the door spring

Reattach the door spring to the cassette door shaft with opening the cassette door.

Fit another end of the door spring to the front cabinet rib.

Fit the shorter end of the door spring to the cassette door.

Screwdriver

Fig.5

Shaft

Door spring

Fig.6

1-7

RC-BZ5LB/BZ5RD RC-BZ6BU

Removing the CD / cassette and amplifier assembly from the rear cabinet

(See Fig.7 and 8)

Prior to performing the following procedure, remove the front cabinet assembly and the rear cabinet assembly.

For the harness connecting the amplifier board with the power board, disconnect it from connector CN306 on the power board in the right rear cabinet assembly. For the harness connecting the battery terminal wire with the power board, disconnect it from CN307 on the power board.

Remove the two screws C on the bottom of the cassette mechanism unit.

Release the harnesses from the slot a, b and c and the notch of the main board in the rear cabinet.

Remove the CD / cassette and amplifier assembly from the rear cabinet.

CD / cassette and amplifier assembly

Slot a

Release the hornese

CD / cassette and amplifier assembly

Slot c

Fig.7

Power board

CN307

CN306

Now the CD / cassette and amplifier assembly is ready to conduct burn-in.

Slot b

Fig.8

CD door eject button

1-8

Key switch / display board

CN704

Fig.9

Removing the CD cover and door unit

(See Fig.9 and 10)

Prior to performing the following procedure, remove the CD / cassette and amplifier assembly.

Disconnect the harness from connector CN704 on the key switch / display board (The harness is extending from the door switch board).

Press EJECT button to open the CD door.

Remove the two screws D on the front of the CD cover and door unit.

Raise the front part of the CD cover and door unit and detach upward. Then push the whole unit backward until it comes off.

RC-BZ5LB/BZ5RD

RC-BZ6BU

CD cover and door unit

Fig.10

ATTENTION:

At this point, the CD mechanism unit will become removable. So handle the rear cabinet with care.

Removing the CD door switch board

(See Fig.11)

Prior to performing the following procedure, remove the CD cover and door unit.

Turn over the CD cover and door unit and gently spread apart the locking tab. Then remove the CD door switch board in the direction of the arrow while releasing it from joint d.

Removing the key switch / display board

(See Fig.12)

Prior to performing the following procedure, remove the front cabinet assembly and the rear cabinet assembly.

Tab

Joint d

CD door switch board

Fig.11

Key switch / display boardKey switch / display board

CN702(RC-BZ5 only)

CN704

Disconnect the card wires from connector CN701, CN702 and CN703, then the harness from CN704 on the key switch / display board.

Remove the four screws E attaching the key switch / display board. The key switch / display board can be removed even if the mechanism cover is attached.

CN703

Cassette mechanism assembly

Fig.12

CN701

1-9

RC-BZ5LB/BZ5RD RC-BZ6BU

Removing the cassette mechanism assembly (See Fig.13 to 15)

Prior to performing the following procedure, remove the CD / cassette and amplifier assembly, the CD cover and door unit and disconnect the harnesses connected to the key switch / display board.

The cassette mechanism cover is still attached.

Push inward the locking tabs e on both sides of the cassette mechanism cover and remove the mechanism cover in the direction of the arrow.

Disconnect the harnesses from connector CN301 and CN308 on the main board.

Remove the upper two screws F and the cassette mechanism assembly toward the front.

Removing the CD mechanism assembly

(See Fig.16)

Prior to performing the following procedure, remove the CD / cassette and amplifier assembly, the CD cover and door unit.

Disconnect the harness from connector P011 on the motor board in the lower part of the CD mechanism assembly. Then disconnect the pickup card wire from CN601 on the main board.

Remove the CD mechanism assembly upward.

Cassette mechanism assembly

Fig.13

Locking tab e

Cassette mechanism cover

Fig.14

Locking tab e

Cassette mechanism

Cassette mechanism assembly

cover

1-10

Motor board

P011

Main board

CN601

CD mechanism assembly

CN301

Cassette mechanism assembly

Fig.15Fig.16

Main board

CN308

RC-BZ5LB/BZ5RD

RC-BZ6BU

Removing the main board

(See Fig.17 to 19)

Prior to performing the following procedure, remove the CD / cassette and amplifier assembly, the CD cover and door unit and the CD mechanism assembly.

Disconnect the harnesses from connector CN301 and CN308 on the main board (The harnesses are extending from the cassette mechanism assembly).

Disconnect the harness from connector CN702 on the key switch/display board (RC-BZ5 only).

Remove the two screws G on the underside of the main board and release the two joint tabs f from the chassis in the direction of the arrow.

ATTENTION:

When reassembling, get the harness extending from FW301 and FW302 on the m a i n board through the two slots g of the chassis. Get the card wire extending from CN304 on the main board through the hook h and the slot i.

CN308

CN702

Key switch/display bord

CN301

Main board

Fig.17

Main board

Joint tab f

Fig.18

Chassis

FW302(RC-BZ5 only)

CN304

FW301

Fig.19

1-11

RC-BZ5LB/BZ5RD RC-BZ6BU

Removing the power transformer assembly (See Fig.20)

Prior to performing the following procedure, remove the front cabinet assembly and the rear cabinet assembly.

Disconnect the harnesses from connector CN306 and CN307 on the power board in the power transformer assembly.

Remove the two screws H attaching the AC jack of the power board and the two screws I attaching the power transformer. Remove the power transformer assembly toward the front.

Power transformer assembly

Power board

CN307

CN306

Fig.20

Removing the battery board

(See Fig.21 and 22)

Prior to performing the following procedure, remove the front cabinet assembly and the rear cabinet assembly.

Disconnect the battery terminal wire from connector CN307 on the power board.

Remove the battery board on the back of the rear cabinet.

Release the hornese

Power board

CN307

Fig.21

1-12

Battery board

Fig.22

Capstan motor ass’ y

RC-BZ5LB/BZ5RD

RC-BZ6BU

Motor bracket

Eject slide

lever

Flywheel ass’ y Leaf switch

Fig.1

Capstan motor

1. Remove the cassette mechanism assembly. (Refer to the article “Cassette mechanism assembly” appearing on a previous page.)

2. Remove one screw A retaining the capstan motor assembly from the back of the cassette mechanism assembly.

3. Disengage the main belt from the flywheel assembly. Then slide the capstan motor slightly in the direction of the arrow a while lifting it upwards to remove together with the main belt.

(Fig.1)

Main belt

Stopper arm

Fig.2

Eject slide lever

1. Place the cassette mechanism back side frontward and disengage the stopper arm b of the Eject slide lever by pressing it inwards through the opening of the chassis with a small screwdriver as shown in Fig.2.

Leaf switch

1. Press the leaf switch in the direction of the arrow c and then remove it in the direction of the arrow d referring to Fig.3.

(Fig.2)

(Fig.3)

Leaf switch

Fig.3

1-13

RC-BZ5LB/BZ5RD RC-BZ6BU

Stopper

Rec/PB

head

Capstan shaft

Erase head

Fig.4

Pinch roller arm ass’y

Base ass’y

Stopper

Fig.5 Fig.6

Pinch roller arm assembly

1. Pull out the stopper protruding from the base assembly in the direction of the arrow e to remove it from the pinch roller arm assembly.

2. Then, pull out the pinch roller arm assembly in the direction of the arrow f.

(Fig.4 to 5)

Stopper

Pinch roller arm ass’y

Stopper

Erase head

P washer

Base ass’y

Rec/PB head and erase head

1. Remove two screws B, C retaining the Rec/PB head.

2. Pull out the stopper of the erase head in the direction of the arrow g.

3. Pull out the erase head in the direction of the arrow h.

Flywheel assembly

1. Remove the split washer retaining the flywheel assembly in the direction of the arrow i.

2. Pull the flywheel assembly out of the back side of the cassette mechanism assembly in the direction of the arrow j.

1-14

(Fig.7)

(Fig.4 to 6)

Flywheel

Fig.7

Adjustment method

RC-BZ5LB/BZ5RD

RC-BZ6BU

Test Instruments required for adjustment

1. Low frequency oscillator (Frequency range: 50Hz to 20kHz) (Output: 0 dBs across 600 Ω terminating resistor)

2. Attenuator(Impedance: 600 Ω)

3. T est Tapes VT712 For tape speed, wow & flutter check VT722, 724 For playback, output level check VT738 For playback frequency response check VT702 For head azimuth adjustment

4. Blank tape TYPE1:AC–225

5. Electronic voltmeter

6. Distortion meter

7. Frequency counter

8. Wow and flutter meter

9. Torque gauge(Cassette type) CTG – N

10. Test disc CTS1000

11. Jitter meter NJM631

12. TE Offset LTM9055

Measuring conditions(Amplifier section)

Supply voltage AC120V(60Hz)

DC12V(UM–1 x 8)

Reference output level Speaker

: 0 dBs(0.775V) / 3 Ω Headphone : –10 dBs(0.245V) / 32 Ω

Reference input level

: –20 dBs supplied to test point CN1 Standard test frequency 1kHz Output measuring point Speaker terminal

:Dummy load 3 Ω

Standard position of switches

Function switch TAPE Beat cut switch NORMAL

Standard position of controls

Tone Maximum position Main volume adjust 0 dBs output position

Test remarks

1. Negative side of the input and output terminals of the testing set, shall be isolated from each other. The negative side should not be commonly connected when a 2channel electronic voltmeter is connected.

2. A dummy load shall be connected to the output terminal and the lead wires of dummy load shall be as thick as possible.

Measuring condition(Tuner section)

Power supply voltage to tuner Vcc: DC 6V Reference output Speaker: 0.245V/3 Ω AM modulation 400Hz, 30% FM modulation 400Hz, deviation 22.5kHz

Remarks for alignment

1. Connect 30 pF capacitor and 33k Ω resistor to the output terminal of the IF sweeper in series while

0.082 µ F capacitor and 100k Ω resistor to the input terminal in series.

2. Set the output level of the IF sweeper as low as adjustable.

3. IF alignment is not necessary for both AM and FM MPX alignment is not necessary either. All IFTs and MPX coil are non-adjusting type.

1-15

RC-BZ5LB/BZ5RD RC-BZ6BU

Cassette amplifier section

Item

Head azimuth adjustment

Tape speed, Wow & flutter check

Conditions Adjustment & Confirmation Method Standard Value Adjusting Point

• Test tape: VT702(8 kHz)

• Test output from: Speaker terminal (with 3 Ω load)

• Function selector: TAPE

• Test tape: VT712 (3 kHz)

•Test output from: Speaker terminal (with 3 Ω load)

1. Play back the test tape VT702 (8 kHz signal).

2. Adjust the azimuth adjusting screw so that phase difference between R and L channels is minimum with the output level that is the maximum level plug less than 2 dB in the FWD and REV mode. After the adjustment apply screw sealant onto the azimuth adjusting screw for more than half the screw head.

3. If the head azimuth is still maladjusted, readjust it with the azimuth adjusting screw alternately in the FWD and REV modes.

1. Play back the end portion of the test tape VT712 (3 kHz signal).

2. At that time check to see if the frequency counter reads 2940 to 3090 Hz. If not, adjust the semi-fixed resistor inside the motor to obtain the specified frequency.

3. Wow and flutter must be 0.38 % or less (unweighted).

• Output: Max. level plus less than 2 dB

• Phase difference between R & L ch: Minimum

Frequency: 2940-3090 Hz

0.38 % or less

(unweighted)

Azimuth adjusting screw (after head replacement only)

Tape speed (with semi-fixed resistor inside motor)

Playback output check

Playback frequency response check

REC/PB sensitivity check

• Function selector: TAPE

• Test tape: VT722, VT724 (1 kHz)

• Test output from: Speaker terminal (with 3 Ω load)

• Function selector: TAPE

• Test tape: VT738

• Test output from:

Speaker terminal (with 3 Ω load)

• Function selector: TAPE

• Mode: Recording

• Test input to:

CN301

1. With the test tape VT722 (1 kHz signal) being played back, confirm that the speaker output is 2.1 W or more with 10 % distortion.

2. With the test tape VT724 being played back, confirm that the deviation between R-ch and L-ch outputs is less than 3 dB.

With the test tape VT738 being played back, confirm that the deviation between 1 kHz and 125 Hz signals is 6 ± 3 dB and that between the 1 kHz and 8 kHz signals is 0 ± 4 dB.

With the input of 1 kHz, –20 dBs signal to the test point CN301, confirm that the level difference between the recording and playback is 0 ± 3 dB or less.

• Speaker output with 10 % distortion:

2.1W or more

• Deviation between R & L ch outputs: 3 dB or less

• Deviation between 1 kHz & 125 Hz: 6 ± 3 dB

• Deviation between 1 kHz & 8 kHz: 0 ± 4 dB

• Level difference between REC & PB: 0 ± 3 dB or less

1-16

RC-BZ5LB/BZ5RD

Tuner sections

Item Conditions Adjustment & Confirmation Methods Stand. values Adjust

RC-BZ6BU

FM, AM IF adjustment

MPX adjustment

FM tracking adjustment

Since a solid IF is being used, no adjustment is required.

Since a ceramic resonator is being used, no adjustment is required.

Since a fixed coil is being used, no adjustment is required.

1-17

RC-BZ5LB/BZ5RD RC-BZ6BU

Description of major IC's

MN35510 (IC603) : Digtal servo & digtal signal processor

1. Block diagram

BYTCK

SMCK

PMCK

VDD

VSS DVDD1 VDSS1

/RST

/TEST

MSEL

STAT

CSEL

PITCH CONTROL

FCLK

GENERATOR

VCOF

TIMING

CK384(EFM)

MDATA

MCLK

MLD

PSEL

RSEL

ARF

DRF

DSLF

PLLF

IREF

PLL VCO

DSL

DEMODULATION

AVDD2

EFM

PCK

SUBCODE

AVSS2

INTERPOLATION

SYNC

SQCK

SUBQ

SUBCODE

BUFFER

DEMODULATION

SSEL

EFM

FLAG5(RESY)

DEMPH

RESY

SUBC

SBCK

/CLDCK

BLKCK

CRC

SRDATAIN(PSEL)

LRCKIN(MSEL)

BCLKIN(SSEL)

IOSEL

CLVS

MN35510

DEEMPHSIS

DIGITAL

8TIMES

OVER SAMPPUNG

DIGITAL FILTER

RFENV

TRCRS

VDET

BDO

/RFDET

OFT

VCO

A/D CONVERTER

INPUT PORT

SERVO

TIMING GENERATOR

MICRO COMPUTER

INTERFACE

SERVO

CPU

OUTPUT

PORT

D/A

CONVERTER

ATTENUATION

PEAK DETCT

AUTO CUE

SRAM

SOFT MUTING

DIGITAL

15K

INTER POLATION

DEINTERLEVE

CORRECTION

CIRC ERROR

SERVO

CLV

1BIT DAC

LOGIS

PWM

INTERFACE

DIGITAL

AUDIO

(L)

–

PWM

(R)

–

1-18

SENSE

WVEL

LDON

PLAY

TES

/TLOCK

/FLOCLK

TOFS

FBAL

TBAL

FOD

TRD

TVD

ECS

(BYTCK)TRVSTR

VREF

KICK

TRV

DMUTE

BCLK

SRDATA

LRCK

ECM

FLAG

IPFLAG

OUTL

OUTR

AVDD1

AVSS1

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