JVC RCBM-5 Service manual

SERVICE MANUAL

CD PORTABLE SYSTEM

RC-BM5

Area suffix

J ----------------------------- U.S.A. C -------------------------- Canada

RC-BM5

Contents

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

1-2 1-3 1-4

1-5 1-6 1-16

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

1-19

1-20 1-21 1-21 1-22 1-37

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No.21129 Oct. 2002

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

Importance administering point on the safety

CN204

CN203

RC-BM5

CN206

F201

Power amplifier board

Caution: For continued protection against risk of fire, replace only with same type: 2.5A/250V for F201. This symbol specifies type of fast operating fuse.

Precaution: Pour eviter les risques de feu, remplacez le fusible de surete par le meme type: 2,5A/250V pour F201. Ce symbole specifie le type du fusible a fonctionnement rapide.

1-5

RC-BM5

Disassembly method

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

1-6

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

RC-BM5

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]

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

Cassette door damper Bracket

Fig.8

1-7

RC-BM5

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.

Section i

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.

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

[Note]

Be sure to hang the spring to the section q before attaching the cassette door bracket.

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

1-8

RC-BM5

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

Removing the volume switch board

(See Fig. 12 and 13.)

Disconnect the wire from the connector H402 on the volume switch board.

Remove the four screws G retaining the control bracket of the volume switch board.

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.)

Removing the power amplifier board and phone jack board (See Fig. 14.)

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

Volume switch board

Control bracket

Volume switch board

H402

Fig.12

Volume switch

(Bottom side)

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.

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

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.

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

Soldered section r

Phone jack board

L K

Board holder (A)

Notch s

Board holder (B)

Soldered section u

Fig.13

CN206

Fig.14

Wire(blue)

Main board

Power amplifier board

Notch t

Wire(black)

Power transformer

CN801

Remove the two screws M retaining the power transformer.

Remove the two screws N retaining the AC jack.

Take out the power transformer together the AC jack.

[Note]

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

AC jack

Tie band

Fig.15

Soldered section v

1-9

RC-BM5

Removing the tuner board

(See Figs. 16 and 17.)

Remove the wire from the connector H801 on the tuner board.

Remove the two screws P and board holders (B) retaining the tuner board.

Pull out the tuner board from the notches w and x of the rear cabinet assembly.

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

(See Fig.17.)

Removing the cassette deck

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

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

H801

Board holder (B)

Fig.16

Soldered section y

Fig.17

Cassette deck mechanism assembly

Notch w

Notch x

Tuner board

Board holder (B)

Tuner board (Reverse side)

Wire clamp

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

Remove the three screws R retaining the cassette board.

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.

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

From the forward side of the cassette board, disconnect the wire from the connector H602 and then remove the cassette board.

[Notes]

When attaching the screw Q', attach the wire at the same time. After assembly, apply a locking agent to the screws Q and Q'.

Cassette deck mechanism assembly

CN602 (Forward side)

Fig.18

H602 (Forward side)

Fig.19

Soldered section aa

Cassette board

Soldered section z

1-10

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 S retaining the CD/Cassette mechanism assembly. (See Fig.12.)

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 T 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 U retaining the main board.

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 V and screw V' 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 V', attach the wire 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. 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

RC-BM5

Removing the CD mechanism assembly (See Fig. 26.)

Prior to performing the following procedures, remove the main board from the CD/Cassette mechanism assembly.

From the bottom side of the CD/Cassette mechanism assembly, remove the four screws W retaining the CD mechanism assembly.

[Note]

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

Removing the CD door switch board

(See Fig. 27.)

From the bottom side of the CD/Cassette mechanism assembly, remove the screw X retaining the CD door switch board.

Removing the hanger and CD door

button (See Fig. 27.)

From the bottom side of the CD/Cassette mechanism assembly, loosen the screw Y of the spring plate holding the hanger and then move the spring plate in the direction of the arrow 1.

Rubber (Orange)

Cassette mechanism assembly

Rubber (Pink)

CD mechanism assembly

Fig.26

(To be loosened)

Claw ad

Rubber (Pink)

CD tray assembly

Hanger

While pressing the claws ac of the hanger in the direction of the arrow 2, remove the hanger from the CD tray assembly.

Press the claws ad of the CD open knob in the direction of the arrow 3 and then take out the CD open knob from the top side of the CD tray assembly.

[Note]

After assembly, apply a locking agent to the screw Y.

Removing the CD door damper

(See Fig. 27.)

1.2.From the bottom side of the CD/Cassette mechanism assembly, remove the two screws Z retaining the CD door damper holder.

Take out the CD door damper.

[Note]

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

Removing the CD door (See Fig. 28.)

Open the CD door.

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

Arm af

Fig.27

Claws ac

CD door switch board

CD door damper

CD door damper holder

CD door

Spring plate

Claw ad

Section ag

Spring

Arm ae

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

[Note]

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

Fig.28

1-13

RC-BM5

Removing the CD pickup unit

(See Figs. 1 to 2.)

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

Remove the three screws A retaining the CD pickup cover.

Remove the slit washer retaining the feed middle gear and take out the feed middle gear.

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

Take out the CD pickup unit.

[Note]

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

(See Fig.2.)

CD pickup cover

CD mechanism assembly

Fig.1

CD pickup unit

Sliding Spring

Feed middle gear

Fig.2

CD pickup unit

Slit washer

Shaft

1-14

RC-BM5

Prior to performing the following procedures, remove the cassette mechanism assembly from the rear cabinet assembly. (See Fig.17 and 18 of "Rear cabinet section" on page 1-10.)

Removing the capstan motor

(See Figs.1 and 2.)

Remove the capstan motor belt.

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

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]

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

Capstan motor

Capstan motor belt

Flywheel assembly

Leaf switch

Cassette mechanism assembly

Fig.1

Capstan motor

Bracket

Fig.2

Removing the erase head

(See Fig.4.)

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

Removing the REC/PB head

(See Fig.4.)

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

[Notes]

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 F.

Removing the flywheel assembly

(See Figs. 4 and 5.)

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

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

Erase head

REC/PB head

Washer

Shaft

Fig.3

Main belt

Fig.4

Slit washer

Claw a

Flywheel assembly

Notch b

Spring

Pinch roller arm assembly

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

Cassette mechanism assembly

Flywheel assembly

Fig.5

1-15

RC-BM5

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 0.5W(1.2V) 3.2 ohm Standard mode of function knob : Selects FM or AM in tuner mode Bass boost: OFF Preset EQ: Flat Main volume: Reference output

Cassette amplifier section Reference output : Speaker output 0.5W(1.2V) 3.2 ohm Standard mode of function knob : Press TAPE knob of select TAPE mode

CD section CD test disc : CTS-1000

Measurement conditions

Power supply voltage AC120V/60Hz

1-16

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: Speakers

Test tape: VT712 (3kHz) Signal output terminal: Speakers

Test tape: VT702 Signal output terminal: Speakers Tape: Normal Signal output terminal: Cassette REC./PLAY HEAD Test tape: AC225 Signal input: SG 1kHz -20dBs with emphasis Signal output terminal: Speakers

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-6dB). While recording, check to see if the frequency at the measuring point is (75+2kHz-2kHz) if not adjust T605 until the frequency counter indicates (75+2kHz-2kHz).

In recording FM mode, and record the reference 1kHz signal and 8kHz signal alternately repeatedly. While playing back the recorded signal of the 1kHz signal differ from that of the 8kHz signal by within (0+4dB4dB).

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-6dB)

Level difference for 1kHz singnal: Within (0+4dB-4dB)

RC-BM5

Head azimuth adjusting screw (To be used only after head replacement) See Fig.1 on page 1-18.

Tape speed: Motor semifixed resistor

See Fig.2 on page 1-18. Check only

T605 See Fig.3 on page 1-18.

Tuner section

Item Measuring condition Check and adjustment procedure Standard value Adjusting part

FM VT adjustment

AM VT adjustment

FM IF adjustment

AM IF adjustment

Signal input: FM antenna VT test point: IC101 pin8 Signal input: AM loop antenna VT test point: IC101 pin8 Signal input: IC101 pin3 Voltage test point: IC101 pin19 and pin20

Signal input: IC101 pin2 Signal output: IC101 pin10

Set the FM signal generator at 108MHz and output

1. level at 60dBu. Adjust L102, so that the VT is within (8+0.2V-0.2V).

Set the AM signal generator at 1710kHz and output

1. level at 100dBu. Adjust T102, so that the VT is within (8V+0.1V-0.1V).

Set the FM signal generator at 10.7MHz with no

1. signal deviation and output level at 90dBu. Short IC101 pin21 to GND.

2. Adjust T103 so that the voltage between IC101 pin19

3. and pin20 is within (0+3mV-3mV). Set the intermediate frequency sweep generator to

1. AM 450kHz. Adjust T104 and T105 for maximum and center

2. output. Adjust T106 so that the voltage between IC101 pin19

3. and pin20 is within (0+2mV-2mV).

VT=8+0.2V-0.2V

VT=8+0.1V-0.1V

0+3mV-3mV

L102 See Fig.4 on page 1-18.

T102 See Fig.4 on page 1-18.

T103 See Fig.4 on page 1-18.

T104 T105 T106 See Fig.4 on page 1-18.

1-17

RC-BM5

Item Measuring condition Check and adjustment procedure Standard value Adjusting part

AM tracking adjustment

FM tracking adjustment

FM stereo separation adjustment

Signal input: AM ANT. COIL antenna Signal output: IC101 pin14 or IC101 pin15 Signal input: FM antenna Signal output: IC101 pin14 or IC101 pin15 Signal input: FM antenna Signal output: IC101 pin14 or IC101 pin15

Location of adjusting parts

Cassette mechanism section

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

Set the AM signal generator at 600kHz and the unit

1. receiving 600kHz, adjust L105(AM ANT. COIL) for maximum output. Set the AM signal generator at 1400kHz and the unit

2. receiving 1400kHz, adjust TC101 for maximum output.

Set the FM signal generator at 90MHz and the unit

1. receiving 90MHz, adjust L101 for maximum output. Set the FM signal generator at 106MHz and the unit

2. receiving 106MHz, adjust TC102 for maximum output.

Set the AM signal generator at 98MHz with stereo

1. deviation and the unit receiving 98kHz. Adjust VR101, so that the separation between the R

2. and L channels for maximum.

L105

TC101 See Fig.4 on page 1-18. L101

TC102 See Fig.4 on page 1-18.

VR101 See Fig.4 on page 1-18.

max

Cassette board

T605

Head

Azimuth adjustment screw

Fig.1 Head output signal

Adjustment

Tuner board

T105

T106

CASSETTE MOTOR

T102

T104

1pin

IC101

15pin

T103

Tape Speed Adj.

L101

TC1

TC102

VR101

14pin

TC10

TC101

L102

Fig.2

L105

(AM ANT. COIL)

1-18

Fig.3

Fig.4

Trouble shooting

RC-BM5

Circuit Symptom Cause

General

Tape

No sound

No sound, weak sound (Low sensitivity)

No sound/recording, unsteady tape sound, weak sound

The unit is on STANDBY mode.

Defective volume control

The unit is on MUTE mode.

Adjust the set position for the best reception.

AM VT faulty

Intermediate frequency tuning faulty

RF tracking faulty

Defective IC101

Adjust FM antenna position for the best reception.

Defective IC101

Intermediate frequency tuning faulty

Dirty capstan or head

Irregular cassette tape winding

Defective IC202

Remedy

Press STANDBY/ON button to turn on the unit.

Set the volume control to a proper sound level.

Press MUTE on the remote control.

Readjust (see "Adjustment method").

Check voltages. Replace if necessary.

Readjust (see "Adjustment method").

Clean the capstan or head with alcohol.

Replace tape.

Check voltages. Replace if necessary.

CD CD-R CD-RW MP3-CD

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

Cassette erasure prevention tabs broken out

Disc is inserted upside down.

Disc is dirty.

Disc is scratched.

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

MP3 formats not supported.

Replace tape or cover tab openings with adhesive tape.

Insert disc correctly.

Wipe clean with a soft cloth.

Use a new disc.

Use only a brand name disc.

Wait about 20 to 30 minutes.

Replace or repair as required.

Replace as required.

Use MP3-CD formats supported on this unit

1-19

RC-BM5

Flow of functional operation until TOC read

Power ON

Slider turns REST SW ON.

Laser ON

Focus start

FOK

Turn on focus servo

Confirm that the voltage at the pin5 of CN502 is "H"/"L"/"H"

Check that the voltage at the pin64(LD) of IC501 is +3.3V.

Disc spinning

Radial_error scaling

PLL Lock

Turn on radial servo

Read TOC

Check that the voltage at the pin1 and pin2 of CN502 is +0.78V.

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

1-20

RC-BM5

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

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.

1-21

RC-BM5

Description of major ICs

SAA7324 (IC501) : Digital servo processor & compact disc decoder

1. Terminal layout

HFREF

HFIN

ISLICE

SSA1

DDA1

ref

RIN

SSA2

CROUT

CRIN

2. Block diagram

SCL SDA RAB

SILD

HFIN

Iref

SUB

RCK

40 39 41 42

VRIN

HFREF

ISLICE

TEST1

TEST2

TEST3

SELPLL

CRIN

CROUT

CL16

CL11/4

SBSY

SFSY

STATUS

RESET

LDONV1V5V4MOTO2

646362616059585756555453525150

171819202122232425262728293021

DDA2

D1 D2 D3 D4

8 91011

ADC

SSD3VDDD2(C)

MOTO1

SLFORA

SAA7324H

pos

neg

TEST1

SELPLL

VSSA1

4 14 5 17 33 50 58 52 57

PRE.

PROCESSING

CL16

DD1(P)

CFLG

DATA

SCLK

WCLK

Vref

GENERATOR

MICROCONTROLLER

CONTROL

PART

INTERFACE

DIGITAL

FRONT-

END

PLL

EFM

DEMODULATOR

TEST

SRAM

RAM

ADDRESSER

TIMING

SUBCODE

PROCESSOR

DETECT

DECODER

MICRO-

CONTROLLER

INTERFACE

VERSATILE PINS

INTERFACE

63 34 61 62

V1 V2/V3 V4 V5 KILL

SSD2

DOBM

CL11/4 49

KILL

TEST2

CONTROL

FUNCTION

PROCESSOR

PEAK

KILL

48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33

AUDIO

SBSY SFSY SUB RCK TEST3 STATUS SILD RAB SCL SDA RESET SCLI SDI WCLI V2/V3 V

SSD1

DDD1(P)

OUTPUT STAGES

MOTOR

CONTROL

ERROR

CORRECTOR

FLAGS

EBU

INTERFACE

SERIAL DATA

INTERFACE

SERIAL DATA

(LOOPBACK)

INTERFACE

BITSTREAM

DAC

DDD2(C)

LDON

MOTO1

MOTO2

CFLG

DOBM

SCLK

WCLK

DATA

SCLI

WCLI

SDI

Vneg

VPOS

1-22

3. Pin function Pin No. Symbol I/O Function

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49

HFREF HFIN ISLICE

SSA1

V V

DDA1

Iref V

RIN

D1 D2 D3 D4 R1 R2

SSA2

V CROUT CRIN V

DDA2

LN LP V

neg

pos

RN RP SELPLL TEST1 CL16 DATA WCLK SCLK EF TEST2 KILL V

SSD1

V2/V3 WCLI SDI SCLI RESET SDA SCL RAB SILD STATUS TEST3 RCK SUB SFSY SBSY CL11/4

Comparator common mode input

Comparator signal input

Current feedback output from data slicer

Analog ground 1

Analog supply voltage 1

Reference current output

Reference voltage for servo ADCs

Unipolar current input 1 (central diode signal input)

Unipolar current input 2 (central diode signal input)

Unipolar current input 3 (central diode signal input)

Unipolar current input 4 (central diode signal input)

Unipolar current input 1 (satellite diode signal input)

Unipolar current input 2 (satellite diode signal input)

Analog ground 2

Crystal/resonator output

Crystal/resonator input

Analog supply voltage 2

DAC left channel differential negative output

DAC left channel differential positive output

DAC negative reference input

DAC positive reference input

DAC right channel differential negative output

DAC right channel differential positive output

Selects whether internal clock multiplier PLL is used

Test control input 1 (this pin should be tied LOW)

16.9344MHz system clock output

Serial d4(1) data output (3-state)

Word clock output (3-state)

Serial bit clock output (3-state)

C2 error flag output (3-state)

Test control input 2 (this pin should be tied LOW)

Kill output (programmable;open-drain)

Digital ground 1

I/O

Versatile I/O:versatile input 2 or versatile output 3 (open-drain)

Word clock input (for data loopback to DAC)

Serial data input (for data loopback to DAC)

Serial bit clock input (for data loopback to DAC)

Power-on reset input (active LOW)

I/O

Microcontroller interface data I/O line (IIC-bus;open-drain output)

Microcontroller interface clock line input (IIC-bus)

Microcontroller interface R/W and load control line input (4-wire bus mode)

Servo interrupt request line/decoder status register output (open-drain)

Test control input 3 (this pin should be tied LOW)

Subcode clock input

P-to-W subcode bits output (3-states)

Subcode frame sync output (3-sates)

Subcode block sync output (3-sates)

11.2896 or 4.2336MHz (for microcontroller) clock output

RC-BM5

1-23

RC-BM5

Pin No. I/O FunctionSymbol

50 51 52 53 54 55 56 57 58 59 60 61 62 63 64

AN7312 (IC601) : Dual recording/Playback pre-amplifier circuit with ALC

1. Terminal layout

14 8

SSD2

V DOBM V

DDD1(P)

CFLG RA FO SL V

DDD2(C)

SSD3

MOTO1 MOTO2 V4 V5 V1 LDON

Digital ground 2

Bi-phase mark output (externally buffered;3-state)

Digital supply voltage 1 for periphery

Correction flag output (open-drain)

Radial actuator output

Focus actuator output

Sledge control output

Digital supply voltage 2 for core

Digital ground 3

Motor output 1;versatile (3-state)

Motor output 2;versatile (3-state)

Versatile output 4

Versatile output 5

Versatile input 1

Laser drive on output (open-drain)

2. Block diagram

Vcc

14 13 12 11 10

Ripple Filter

1 2 3 4 5 6

GND

ALC

3. Pin function Pin No. Symbol Function

GND

ALC time constant

ALC input Ch.1

Output Ch.1

Phase compensation Ch.1

N.E.B. Ch.1

Input Ch.1

Input Ch.2

N.E.B. Ch.2

Phase compensation Ch.2

Output Ch.2

ALC input Ch.2

Ripple filter

Vcc

I/O

GND

ALC time constant by resistance and capacitor

Right channel ALC input

Right channel output

Not connect

Right channel negative feed back input

Right channel signal input

Left channel signal input

Left channel negative feed back input

Not connect

Left channel output

Left channel ALC input

Ripple filter

Power supply

Amp.

Ch2

Amp.

Ch1

1-24

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JVC RCBM-5 Service manual

Specifications and Main Features

Frequently Asked Questions

User Manual