JVC MXK-10-R, MXK-15-R, MXK-30-R Service manual

MX-K10R/K30R/K15R

SERVICE MANUAL

COMPACT COMPONENT SYSTEM

REPEAT

BASS EX.

CD1CD2CD

SOUND MODE

ACTIVE

MX-K

STANDBY/ON

SLEEP

AUX

FM MODE

FM /AM

CD1CD2CD

PROGRAM

REPEAT

/RANDOM

TAPE A/B

TAPE

DISPLAY

SELECT

PTY/EON MODE

SOUND MODE

FADE

ACTIVE

MUTING

BASS EX.

LUME

10R/K30R/K15R

MX-K30R

..................

.................

..................

.................

3-CD

PLAY & EXCHANGE

COMPACT COMPONENT SYSTEM

MX-K30R

1 BIT

DUAL D/A CONVERTER

PROGRAM

PANDOM

ANDBY/ON

ECO

STANDBY

SET

CANCEL

/ DEMO

PRESET

TAPE

AUX

/ AM

PHONES

TUNING

REC START / STOPCD REC START DUBBING

CLOCK

TAPE

SELECT

PTY / EON

DISPLAY MODE

/TIMER

A / B

EJECT EJECT

CD SYNCHRO RECORDING

FULL - LOGIC CONTROL

PLAY

CD-R/RW PLAYBACK

SOUND

MODE

REPEAT

I K S

C S I

D C

ACTIVE

D C

BASS EX.

D C

REC / PLAY

MX-K10R

..................

.................

MX-K15R

.................

Area Suffix

Continetal Europe

Northern Europe

U.K.

E. Europe/Russia

Continetal Europe

Northern Europe E. Europe/Russia

E. Europe/Russia

SP-MXK30 CA-MXK30R SP-MXK30

BASS-REFLEX BASS-REFLEX

STANDBY/ON

SLEEP

AUX

FM MODE

FM /AM

PROGRAM /RANDOM

TAPE A/B

TAPE

DISPLAY

SELECT

PTY/EON MODE

FADE

MUTING

OLUME

3-CD

PLAY & EXCHANGE

COMPACT COMPONENT SYSTEM

MX-K10R

1 BIT

DUAL D/A

CONVERTER

PROGRAM

PANDOM

ANDBY/ON

ECO

STANDBY

SET

CANCEL

/ DEMO

PRESET

TAPE

AUX

/ AM

PHONES

TUNING

REC START / STOPCD REC START DUBBING

CLOCK

TAPE

SELECT

PTY / EON

DISPLAY MODE

/TIMER

A / B

EJECT EJECT

CD SYNCHRO RECORDING

FULL - LOGIC CONTROL

PLAY

CD-R/RW PLAYBACK

SOUND

MODE

REPEAT

IP K S

C S I

D C

ACTIVE

D C

BASS EX.

D C

REC / PLAY

CD1CD2CD

REPEAT

SELECT

SOUND MODE

ACTIVE BASS EX.

STANDBY/ON

SLEEP

AUX

FM MODE

FM /AM

PROGRAM /RANDOM

TAPE A/B

TAPE

DISPLAY

PTY/EON MODE

FADE MUTING

LUME

BASS-REFLEX BASS-REFLEX

3-CD

PLAY & EXCHANGE

COMPACT COMPONENT SYSTEM

MX-K15R

1 BIT

DUAL D/A CONVERTER

PROGRAM

PANDOM

ANDBY/ON

ECO

STANDBY

SET

CANCEL

/ DEMO

PRESET

TAPE

AUX

/ AM

PHONES

TUNING

REC START / STOPCD REC START DUBBING

CLOCK

TAPE

SELECT

PTY / EON

DISPLAY MODE

/TIMER

A / B

EJECT EJECT

CD SYNCHRO RECORDING

FULL - LOGIC CONTR OL

PLAY

CD-R/RW PLAYBACK

SOUND

MODE

REPEAT

IP K S

C S I

ACTIVE

D C

BASS EX.

D C

REC / PLAY

SP-MXK10 CA-MXK10R SP-MXK10 SP-MXK15 CA-MXK15R SP-MXK15

Contents

Safety precautions

Important for laser products

Preventing static electricity

Disassembly method

Adjustment method

1- 2

1- 3

1- 4

1- 5

1-19

2002VICTOR COMPANY OF JAPAN, LTD.

Flow of functional

operation until TOC read

Maintenance of laser pickup

Replacement of laser pickup

Description of major ICs

1-21

1-22

1-23

No.21138

Dec.2002

Safety Precautions

1. This design of this product contains special hardware and many circuits and components specially or safety purposes. For continued protection, no changes should be ma de 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 de sign or circuitry of the product should not be made. Any design alterations of the product should not be made. Any design alterations or a ddition s will void the ma nufacturer`s warranty and will further relieve the ma nufa cture of responsibility f or personal injury or property da mage re sulting therefrom.

3. Many electrical and mechanical parts in the products have special safety-related characteristics. These characteristics are often not evident from visual in spe ction nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have the se 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 a nd dre ssed with ties, clamps, tubings, barriers and the like to be separated from live parts, high temperature parts, moving parts a nd/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 termin als, knobs, metal cabinet, screw heads, he adphone 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.

l 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.)

l 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 AC-type capacitor between an exposed metal part and a known good earth ground. Measure the AC voltage acros s the resi stor with the AC voltmeter.

Move the resistor connection to each exposed

metal part, pa rticularly 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 andrepeat 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.).

Warning

1. This equipment ha s been designed a nd manufa ctured 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 a ccordance with the releva nt safety standards.

4. It is essential that safety critical components are repla ced by a pproved parts.

5. If mains voltage selector is provided, check setting for local voltage.

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. When replacing them, be sure to use the parts of the same type and rating as specified by the manufacturer. (Except the J and C version)

! 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.

1-2

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 :

Laser Unit. Do not disassemble the Laser Unit. Replace the complete Laser Unit if it malfunctions.

4.CAUTION :

laser radiation and is equipped with safety switches which prevent emission of radiation when the drawer is open and the safety interlocks have failed or are defeated. It is dangerous to defeat the safety

switches.

VARNING : Osynlig laserstrålning är denna del är

VARO : Avattaessa ja suojalukitus ohitettaessa olet

There are no serviceable parts inside the

The compact disc player uses invisible

öppnad och spårren är urkopplad. Betrakta ej strålen.

alttiina näkymättömälle lasersäteilylle. Äl ä katso säteeseen.

5.CAUTION : If safety switches malfunction, the laser is able to function.

6.CAUTION :

mance of procedures other than those specified herein may result in hazardous radiation exposure.

CAUTION Please use enough caution not

Use of controls, adjustments or perfor-

to see the bea m directly or touch it in case of an adjustment or operation check.

ADVARSEL : Usynlig laserstråling ved åbning, nå r

sikkerhedsafbrydere er ude af funktion. Undgå udsættelse for stråling.

ADVARSEL : Usynlig laserstrå ling ved åpning, når

sikkerhetsbryteren er avslott. Unngå utsettelse for stråling.

REPRODUCTION AND POSITION OF LABELS

WARNING LABEL

1-3

Preventing static electricity

1. Grounding to prevent da mage 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 e arth processing for the de struction prevention by static electricity

In the equipment which uses optical pick-up (laser diode), optical pick-up is destroyed by the static electricity of the work environment. 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.

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 CD cha nger unit (optical pickup)

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

2. Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific

details, refer to the replacement procedure in the text. Remove the anti-static pin when replacing the CD changer 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.

Attention when traverse unit is decomposed

* Please refer to "Disassembly method" in the text for pick up and how to detach the CD changer mechanism.

1. Remove the CD changer unit.

2. Disconnect the harness from connector on the CD motor board.

3. Solder is put up before the card wire is removed from connector Cn601on the main board a s shown in Fig.1 a nd Fig. 2.

(When the wire is removed without putting up solder, the CD

pick-up assembly might destroy.)

4. Please remove solder after connecting the card wire with CN601 when you install picking up in the substrate.

1-4

Disassembly method

Commence disassembly of this set by removing the main units and then proceed to the components and assemblies inside the units.

Replacement of the fuses and the power IC

n Top cover n CD changer unit n Front panel assembly n Chassis unit

n CD changer unit

n Removing the main PCB n Removing the CD changer mechanism assembly n Removing the CD pickup n Replacing the loading motor and belt of the CD changer tray n Replacing the CD tray rotor belt of CD changer, and removing the motor

n Front panel assembly

n Removing the cassette deck mechanism n Removing the earphone jack PCB n Removing the control/FL PCB n Removing the switch PCB and ACTIVE BASS EX. switch PCB n Removing the cassette deck main motor, and replacing the main belts n Removing the leaf switches of the cassette deck me chanism n Removing the cassette deck heads

n Chassis unit

n Removing the 3-pin regulator n Removing the power amp and supply PCB and the Power Trans PCB n Removing the sub power PCB

1-5

<Disasse mbly of the main blocks of this set> Repla c ement of the fuses and the power IC

n Re pla cing the fuse s (See Fig.1, Fig.4)

Prior to performing the following procedure, remove

the left side BOARD a nd remove tuner PCB (Fig.4,BB)

1. Replace the fuses in side.

[Caution] Be sure to use fuses with the specified ratings.

For CA-MXK10R/15R Fig.1(A) BOTTOM SIDE

CN981

CAUTION

(don’t remove the safety sheet cover )

For CA-MXK10R/15R Fig.1(A) Component SIDE

Fuse(F981) T1AL 250V

Fuse(F952) T1.6AL 250V

FW981

Fuse (F981) T2AL 250V

CN981

For CA-MXK30R Fig.1(B) BOTTOM SIDE

HOLE

Fuse Hole

For CA-MXK30R Fig.1(B) Component SIDE

CAUTION

(don’t remove the safety sheet cover )

Fuse(F952)

FW951

Fuse (F952) T1.6AL 250V

FW981

Fuse(F981) T1AL 250V

CN981

n Repla cing the power IC (See Fig.2 to 3)

Prior to performing the following procedure, remove

the top cover.

1. Remove the two screws "A" from the heat sinkbetween

the power IC.

2. Remove the solder fixing the power IC.

For CA-MXK10R/15R Fig.2

Fuse(F952) T1.6AL 250V

For CA-MXK30R Fig.3

Fuse (F981) T2AL 250V

CN981

1-6

n Repla cing the he at sink cover

1. Remove the six screws "B" from the back pa nel.

2. Pull the heat sink cover outward.

For CA-MXK30R Fig.4

n Re moving the top cover a nd two side s BOAR D

(See Fig.5 and 6)

1. Remove the six screws "C" that retain the top cover from the rear of the body.

For CA-MXK15R Fig.5(B)

For CA-MXK10R/K30R Fig.6(A)

2. Remove the eight screws "C" and "D" that retain the top from the two sides of the body.

3. Remove the top cover from the body by lifting it toward the rear.

For CA-MXK10R/K30R Fig.5(A)

1-7

For CA-MXK15R Fig.6(B)

n Removing the CD changer unit

(See Fig.7 to 10)

Prior to performing the following procedures, remove the top cover and both sides BOARD.

[Caution] Although the CD mechanism unit can be

removed without removing the CD tray panel, it is still recommended to remove it in order to prevent da mage.

a. From the front panel side of this set, push in the sec-

tions marked with arrows and pull out the CD tray toward the front.

b. Remove the CD tray panel by pushing both of its ex-

tremities upward in the direction of the arrows.

c. Push the CD tray deep into the set.

1. Disconnect the card wires from the CD PCB CN703 and CN203.

2. From the rear of the set, remove the two screws "E" and two serews "G" on the front panel left and right side.

3. Handle the CD changer unit rear, ta ke out unit.

1-8

For CA-MXK10R/30R Fig.9(A)

For CA-MXK15R Fig.9(B)

1-9

n Removing the front panel assembly

(See Fig.11 and 12)

Prior to performing the following procedures, remove

the top cover and both sides board.

Also remove the CD cha nger unit.

1. Disconnect the parallel wire and card wire from the connectors CN702,CN701,CN101on the power a mp and supply PCB.

2. Remove the two screws "H" retaining the front panel assembly onto the bottom of the body.

3. Remove the screw "I" retaining the cassette deck mechanism and then remove then GND lug "b" that comes from the power a mp and supply PCB.

4. Disengage the claws "c" on both side s at the bottom of the front panel assembly and then remove the assembly.

1-10

n Removing the CD PCB

(See Fig.13 and 14)

Prior to performing the following procedures, remove

the top cover and both sides board.

Also remove the CD cha nger unit.

1. Disconnect the wires from CN603A, CN603B and CN604 on the CD PCB, which is located on the back side of the CD changer unit.

2. The two screws "J" that retain the CD PCB should be removed.

3. Remove the CD PCB by pulling it toward the side where the CN601 is located.

4. Using solder, short the CD pickup to connect to short round.

[Caution] After re-connecting the wires, be sure to

remove the shorting solder from the GND connection.

5. Disconnect the card wire from the conne ctor CN601 on the main PCB and then remove the main PCB.

1-11

n Removing the CD changer mechanism

assembly

Prior to performing the following procedures, remove the top cover and both sides board.

Also remove the CD cha nger unit.

1. Remove the screws "d" from the front chuch ba se of the CD cha nger me cha nism unit.

2. Turn the CD changer mechanism cover base and remove the screws "e" connecting the unit to the CD changer mecha nism assembly.

3. Removing the four screws "k" retaining the CD

mechanism holder assembly.

[Caution] When repla cing the CD cha nger mecha nism

assembly, be sure not to mistake the positions of the silver color and copper color spring.

(See Fig.15 to 17)

1-12

n Removing the CD pickup (See Fig.18)

Prior to performing the following procedures, re-

move the top cover and both sides board.

Also remove the CD changer unit.

Also remove the CD changer mechanism.

1. Widen the section "f".

2. While keeping the section "f" wide open, push the section "g" in the direction of the arrow to remove the shaft, and then remove the CD pickup.

n Replacing the loa ding motor and rotor belt

of the CD changer (See Fig .19)

Prior to performing the following procedure, re-

move the top cover.

Also open the CD changer tray.

1. Remove the two screws "L" retaining the CD changer tray loading motor.

2. Remove the two screws "M" retaining the gear plate and take it out, after remove the rotor belt from the pulley.

n Replacing the CD turn table and remov-

ing the motor (See Fig. 20 and 21)

Prior to performing the following procedures, re-

move the top cover.

Also remove the CD changer unit.

1. Remove the one screws "N" retaining the CD (Turn table).

2. Remove the two screws "O" retaining the stopper brackets on both sides of the CD cha nger unit.

3. Remove the stopper brackets from both sides of the CD changer unit.

4. Pull out the CD tray from the CD changer unit, all the way and lift the tray (u/~ ward) to remove.

5. Remove the gear and after push out the tray motor locker and pull out the tray motor from the CD tray.

1-13

n Removing the cassette deck mechanism

(See Fig.22)

Prior to performing the following procedure, remove the top cover and both sides board.

Also remove the CD cha nger unit.

Also remove the front panel assembly.

1. Remove the five screws "Z" retaining the ca ssette deck mechanism.

n Removing the earphone jack PCB

(See Fig.23)

Prior to performing the following procedure, remove the top cover and both sides board.

Also remove the CD cha nger unit.

Also remove the front panel assembly.

1. Remove the screw with the washer, "P" that retains the earphone jack PCB.

nRemoving the control/FL PCB

(See Fig.24)

Prior to performing the following procedure, remove the top cover and both sides board. Also remove the CD cha nger unit.

Also remove the CD cha nger unit.

1. Remove the four screws "Q" that retain the control/FL PCB from the back of the front pa nel unit.

1-14

 Removing the switch PCB and sound

mode and CD function switch PCB

(See Fig.24 to 27)

 

Prior to performing the following procedures, remove

the top cover and both sides board.

 

Also remove the CD changer unit.

 

Also remove the front panel assembly.

1. Pull out the volume control knob from the front of the front panel assembly.

2. Remove the four screws "Q" retaining the front panel assembly.

3. Remove the control / FL PCB.

4. Remove the eleven screws "R" retaining the switch (key 1) PCB.

5. Remove the three screws "S" retaining the sound mode (key 2) switch PCB.

6. Remove two screws "T" retaining the CD function (key

3) switch PCB.

1-15

n Re moving the ca ssette de ck main motor ,

and re placing the main belts

(See Fig. 22, 28 and 29)

Prior to performing the following procedures, remove

the top cover and both sides board.

Also remove the CD cha nger unit.

Also remove the front panel assembly.

1. Remove the five screws "z" retaining the ca ssette deck mechanism.

2. Remove the ca ssette deck me chanism.

3. Remove the two screws "t" retaining the main motor from the front side of the ca ssette deck.

[Caution] After attaching the main motor, check the

orientation of the motor and the polarity of the wires.

4. From the backside of the cassette deck, remove the main motor and two main belts.

[Caution] The lengths of the cassette A (playback

only) and cassette B (record/play) main belts are different. When atta ching the main belts, use the longer belt for cassette A.

n Removing the leaf switches of the cas-

sette deck mechanism

(See Fig. 22 and 30)

Prior to performing the following procedures, remove

the top cover and both sides board.

Also remove the CD cha nger unit.

Also remove the front panel assembly.

1. Remove the five screws "O" that retain the cassette deck mechanism.

2. Remove the ca ssette deck me chanism.

3. Turn the cassette deck mechanism upside down.

4. Remove the solder from around the leaf switches.

5. Pull out the leaf switches from the front side of the cassette deck mechanism.

1-16

n Removing the cassette deck heads

(See Fig. 22 and 31)

Prior to performing the following procedures, remove the top cover and both side board.

Also remove the CD cha nger unit.

Also remove the front panel assembly.

1. Remove the five screws "O" that retain the cassette deck mechanism.

2. Remove the ca ssette deck mecha nism a nd pla ce it so that the front side faces up.

3. Remove the solder from the bottom side of the head terminal and disconnect the wire.

4. Remove the screw "U" that retains the head.

5. Remove the screw "V" that retains the head.

6. Hold the head and slide it in the direction of the arrow to remove it.

n Removing the 3-pin regulator

(See Q904, Q907, 32 and 33)

Prior to performing the following procedures, remove the top cover and both sides board.

1. Remove the two screws "A" that connect the heat sink cover to the rear panel.

2. Pull the heat sink outward.

3. Remove the screw "W" that retains the heat sink the 3-pin terminal regulator Q904,Q907.

4. Remove the solder fixing the 3-pin regulator.

For CA-MX K30R Fig.32

For CA-MX K10R/K15R Fig. 33

1-17

n Removing the power amp and supply

PCB and the power trans PCB

(See Fig. 2, 3, 32, 34 to 37)

For CA-MXK10R/K15R Fig.34(A)

Prior to performing the following procedures, remove the top cover and both sides board.

Also remove heat sink cover .(Fig.4)

1. Remove the two screws "A" connecting the heat sink cover to the rear panel.(Fig.2, 3)

2. Pull out the heat sink cover toward you.

3. Remove the three (CA-M XK10/K15R)/ four(CA-MXK30) screws "AA" form the (CA-MXK10/K15R) chassis / MX-K30 back panel between the heat sink.

4. Remove the three screws "X" that retain the speaker terminals and AUX terminal.

5. Remove the screw "YY" that retains the rear panel, and then remove the re ar panel.

6. Disconnect the parallel wires from the connectors FW951 and CN981 on the power tra n s PCB.

7. Remove the screw "Z" that retain the power a mp a nd supply PCB and then remove the assembly.

8. Remove the cla mp of AC power cord from the cha ssis.

9. Remove the four screws "AB" that retain the power trans PCB and then remove the assembly.

CLAMP

For CA-MXK10R/K15R Fig.34(A)

For CA-MXK10R/K15R Fig.35 (A) Component SIDE

Fuse (F952) T1.6AL 250V

FW981

Fuse(F981) T1AL 250V

Fig.36

CN981

For CA-MXK30R Fig.35(B) Component SIDE

Fuse(F952) T1.6AL 250V

For CA-MXK10R/K15R Fig.37 (A)

Fuse (F981) T2AL 250V

For CA-MXK30R Fig.34(B)

CN981

For CA-MXK30R Fig.37(B)

Fuse F981 T2AL 250V

CLAMP

Fuse F952 T1.6AL 250V

FW 951

1-18

Adjustment method

Measurement instruments required for adjustment

1. Low frequency oscillator, This oscillator should have a capacity to output 0dB

to 600ohm at an oscillation frequency of 50Hz20kHz.

2. Attenuator impedance : 600ohm

3. Electronic voltmeter

4. Frequency counter

5. Wow flutter meter

6. Test tape VT712 : For Tape speed and wow flutter ( 3kHz) VT703 : For Head a ngle(10kHz),Play ba ck frequency

characteristics(1kHz), and dubbing frequency characteristics (63,1,10kHz)

7. Blank tape

TAPE I : AC-225

8. Torque gauge : For play and back tension forward ; TW2111A, Reverse ; TW2121A Fast Forward and Rewind ; TW2231A

9. Test disc: CTS-1000(12cm),GRG-1211(8cm)

10. Jitter meter

Measurement conditions

Power supply voltage AC230V (50Hz)

Measurement output terminal : Speaker out

: TP101(Measuring for TUNER/

DECK/CD)

: Dummy load 6ohm

Radio input signal

AM modulation frequency : 400Hz Modulation factor : 30% FM modulation frequency : 1kHz Frequency displacement : 22.5kHz

Frequency Range

FM 87.5MHz~108MHz MW 522kHz~1629kHz LW 144kHz~228kHz

Standard me asurement positions of volume and switch

Power: Standby (Light STANDBY Indicator) S, A, BASS : OFF Sound mode : OFF Main VOL. : 0 Minimum Travers mecha set position : Disc 1

Precautions for measurement

1. Apply 30pF and 33kohm to the IF sweeper output side and 0.082 sweeper input side.

2. The IF sweeper output level should be made as low as possible within the adjustable range.

3. Since the IF sweeper is a fixed device, there is no need to adjust this sweeper.

4. Since a ceramic oscillator is used, there is no need to perform any MPX adjustment.

5. Since a fixed coil is used, there is no need to adjust the FM tracking.

6.The input and output earth systems are separated. In case of simultaneously measuring the voltage in both of the input and output syst ems with an electronic voltmeter for two cha nnels, theref ore, the e arth should be connected particularly.

7. In the case of BTL connection amplifier, the minus terminal of speaker is not for earthing. Therefore, be sure not to connect any other earth terminal to this terminal. This system is of an OTL system.

F and 100kohm in series to the

1-19

 Arrangement of adjusting positions

 Tape recorder section

Items

Cassette Head Azimuth Alignments

Recordi ng Bi as Frequency Alignment

 Tuner section

Items

AM Tracking Alignments

Measurement

condi tions

Test tape : VT703 (10kHz) Measurement output terminal : Left and Right speaker output (6-ohm loaded) or Headphone Output (32-ohm loaded)

Test tape : TYPE I AC-225 Measurement output terminal : Erase head terminal (CN308 8-Pin)

Measurement

condi tions

Input signal : 529kHz (530kHz) 603kHz (600kHz)

Measurement point : Resistor(R3) terminal

Measu rement meth o d

1. Playback the test tape VT703 (10KHz) or equivalent.

2. Adjust the head azimuth screw to obtain maximum output and both output of L / R is in 3dB.

3. Put on the screw lock paint after alignments.

1. Insert the recording tape in deck-B.

2. Starting the recording.

3. Adjust the oscillation frequency to 80KHz+/-3KHz by core of Oscillation coil of L301.

Measurement method

1. Set the Signal Generator signal to 529KHz (530KHz) the feed to Loop Antenna.

2. Receiving the signal and the adjust the OSC coil

L4(MW)/L5(LW) obtain the V.T is 1.40V +/-0.05V.

3. Change the receiving frequency to 603KHz (600KHz).

4. Adjust the Antenna coil L2(MW)/L3(LW) obtain

maximum sensiti vity .(Adjust the SSG output to out of AGC range.)

Standar d

values

Maximum output Head azimuth

80kHz+/-3kHz Bias coil: L301

Standard

values

V.T :

1.40V+/-0.05V

Maximum sensitivity

Ad ju stin g

posi tions

screw

Adjust the head azimuth screw only when the head has been changed.

Use the HighImpedance Probe or Frequency counter input.

Ad ju stin g

posi tions

OSC coil: L4(MW)/L5(LW) Antenna coil: L2(MW)/L3(LW)

Adjust the OSC coil only when the AM coil block has been changed.

AM IFT Alignments Input signal :

530kHz (529kHz)

1. Set the receiving frequency to 529KHz (530KHz ).

2. Feed the 450KHz signal to AM antenna input.

3. Adjust the IFT Block T1 obtain to maximum output. (Adjust the SSG output to out of AGC range.)

Note: The adjustment of CD section is not required.

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Maximum output IFT(T1)

Adjust the IFT only when the IFT b lo c k ha s been changed.

Flow of functional operation until TOC read

Power ON Play Key

Tracking error waveform at TOC reading

pin 20 of IC611(TE)

Approx.3sec

Slider turns REST

SW ON.

Automatic tuning

of TE offset

Laser ON

Detection of disc

Automatic tuning of

Focus offset

Automatic measurement of

Focus S-curve amplitude

Disc is rotated

Focus servo ON

(Tra cking servo ON)

Check Point

Confirm that the voltage at the pin5 of CN602 is "H"\"L"\"H".

Check that the voltage at the pin40 of IC601 is + 5V?

Confirm that the Focus error S-cuve signal at the pin32 of IC601 is approx.2Vp-p

Confirm that the signal from pin24 IC601 is 0V as a accelerated pulse during approx.400ms.

Approx

1.8V VREF

Disc states to rotate

Automatic measurement of TE amplitude and automatic tuning of TE balance

Tracking servo off states

Tracking servo on states

Disc to be braked to stop

TOC reading finishes

500mv/div 2ms/div Fig.1

Automatic measurement of

Tracking error amplitude

Automatic tuning of

Tracking error balance

Automatic tuning of

Focus error balance

Automatic tuning of

Focus error gain

Automatic tuning of

Tracking error gain

TOC reading

Play a disc

Confirm the waveform of the Tracking error signal. at the pin 20 of IC61 1 (R643) (See fig-1)

Confirm the eys-pattern at the lead of Tp3

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Maintenance of laser pickup

(1) Cleaning the pick up lens

Before you replace the pick up, please try to clean the len s with a alcohol soaked cotton swab.

(2) Life of the la ser diode

When the life of the la ser diode has expired, the following symptoms will a ppe ar.

1. The level of RF output (EFM output: a mpli tude of eye pattern) will below.

Repla cement of laser pickup

(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 chara cteristics of the whole optical block, do not touch the semi-fixed resistor. If the la ser power is lower than the specif ied value, the la ser 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.

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