Download: SERVICE MANUAL COMPACT COMPONENT SYSTEM MX-K350V

MX-K350V

SERVICE MANUAL COMPACT COMPONENT SYSTEM MX-K350V

Area Suffix US ... SINGAPORE UX ... SAUDI Contents Safety precautions - 1- 2 Flow of functional Important for laser products - 1- 3 operation until TOC read - 1-20 Preventing static electricity - 1- 4 Maintenance of laser pickup - 1-21 Disassembly method - 1- 5 Replacement of laser pickup - 1-21 Adjustment method - 1-18 Description of major ICs - 1-22 No.21166 COPYRIGHT © 2001VICTOR COMPANY OF JAPAN, LTD. 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 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.).

Warning ! CAUTION

1. This equipment has been designed and manufactured to meet international safety standards. Burrs formed during molding may 2. It is the legal responsibility of the repairer to ensure that these safety standards are maintained. be left over on some parts of the 3. Repairs must be made in accordance with the relevant safety standards. chassis. Therefore, pay attention 4. It is essential that safety critical components are replaced by approved parts. to such burrs in the case of 5. If mains voltage selector is provided, check setting for local voltage. 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. 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) 1-2,

Important for laser products

1. CLASS 1 LASER PRODUCT 5. CAUTION : If safety switches malfunction, the laser is able 2. DANGER : Invisible laser radiation when open and inter to function. lock failed or defeated. Avoid direct exposure to beam. 6. CAUTION : Use of controls, adjustments or performance of 3. CAUTION : There are no serviceable parts inside the Laser procedures other than those specified herein may result Unit. Do not disassemble the Laser Unit. Replace the in hazardous radiation exposure. complete Laser Unit if it malfunctions. 4. CAUTION : The compact disc player uses invisible laser ! CAUTION Please use enough caution not to radiation and is equipped with safety switches which see the beam directly or touch it in prevent emission of radiation when the drawer is open case of an adjustment or operation and the safety interlocks have failed or are defeated. It is check. dangerous to defeat the safety switches. VARNING : Osynlig laserstrålning är denna del är ADVARSEL : Usynlig laserstrål ing ved åbning, når öppnad och spårren är urkopplad. Betrakta sikkerhedsafbrydere er ude af funktion. ej strålen. Undgå udsættelse for stråling. VARO : Avattaessa ja suojalukitus ohitettaessa olet ADVARSEL : Usynlig laserstrål ing ved åpning, når alttiina näkymättömälle lasersäteilylle. Älä sikkerhetsbryteren er avslott. Unngå katso säteeseen. utsettelse for stråling.

REPRODUCTION AND POSITION OF LABELS WARNING LABEL

1-3,

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 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 testers internal power source can easily destroy the laser diode. 4. Handling the CD changer 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 ad- justs 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 as shown in Fig.1 and 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 Top cover CD changer unit Front panel assembly Chassis unit CD changer unit Removing the main PCB Removing the CD changer mechanism assembly Removing the CD pickup Replacing the loading motor and belt of the CD changer tray Replacing the CD tray rotor belt of CD changer, and removing the motor Front panel assembly Removing the cassette deck mechanism Removing the earphone jack PCB Removing the control/FL PCB Removing the switch PCB and ACTIVE BASS EX. switch PCB Removing the cassette deck main motor, and replacing the main belts Removing the leaf switches of the cassette deck mechanism Removing the cassette deck heads Chassis unit Removing the 3-pin regulator Removing the power amp and supply PCB and the Power Trans PCB Removing the sub power PCB 1-5, Replacing the power IC (See Fig.2 ) Replacement of the fuses and the power IC Prior to performing the following procedure, removethe top cover.

Replacing the fuses (See Fig.1, Fig.3) 1. Remove the two screws “ A ” from the heat sinkbetween

the power IC. Prior to performing the following procedure, remove the left side BOARD and remove tuner PCB (Fig.3,BB) 2. Remove the solder fixing the power IC. 1. Replace the fuses inside. [Caution] Be sure to use fuses with the specified ratings.

Replacing the heat sink cover

1. Remove the six screws from the back panel. 2. Pull the heat sink cover outward. 1-6,

Removing the top cover and two sides

BOARD (See Fig.4 and 5) 1. Remove the six screws “ B ” that retain the top cover from the rear of the body. 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. 1-7,

Removing the CD changer unit

(See Fig.6 and 9) 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 damage. a. From the front panel side of this set, push in the sections marked with arrows and pull out the CD tray toward the front. b. Remove the CD tray panel by pushing both of its extremities 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 CN704, CN607, CN1101 and disconnect CN1 (shield wire) from back panel. 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, take out unit. Fig.6 1-8,

Removing the front panel assembly

(See Fig.10 and 11) Prior to performing the following procedures, remove the top cover and both sides board. Also remove the CD changer unit. 1. Disconnect the parallel wire and card wire from the connectors CN702, CN701, CN703, CN850 on the power amp 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 amp and supply PCB. 4. Disengage the claws “ c ” on both sides at the bottom of the front panel assembly and then remove the assembly. 1-9,

Removing the CD PCB

(See Fig.12 and 13) Prior to performing the following procedures, remove the top cover and both sides board. Also remove the CD changer unit. 1. The two screws “ E ” that retain the VCD assembly should be removed. 2. Disconnect the wires from CN602, CN603, CN604 and CN605 on the CD PCB, which is located on the back side of the CD changer unit. 3. The two screws “ J ” that retain the CD PCB should be removed. 4. Remove the CD PCB by pulling it toward the side where the CN601 is located. 5. 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 con- nection. 6. Disconnect the card wire from the connector CN601 on the main PCB and then remove the main PCB. 1-10,

Removing the CD changer mechanism

assembly (See Fig.14 and 16) Prior to performing the following procedures, remove the top cover and both sides board. Also remove the CD changer unit. 1. Remove the screws “ d ” from the front chuch base of the CD changer mechanism unit. 2. Turn the CD changer mechanism cover base and remove the screws “ e ” connecting the unit to the CD changer mechanism assembly. 3. Removing the four screws “ k ” retaining the CD mechanism holder assembly. [Caution] When replacing the CD changer mechanism assembly, be sure not to mistake the positions of the silver color and copper color spring. 1-11,

Removing the CD PCB (See Fig.17)

Prior to performing the following procedures, remove 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.

Replacing the loading motor and rotor belt

of the CD changer (See Fig.18) Prior to performing the following procedure, remove 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.

Replacing the CD turn table and removing

the motor (See Fig. 19 and 20) Prior to performing the following procedures, remove 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 changer 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. 1-12,

Removing the cassette deck mechanism

(See Fig.21) Prior to performing the following procedure, remove the top cover and both sides board. Also remove the CD changer unit. Also remove the front panel assembly. 1. Remove the five screws “ Z ” retaining the cassette deck mechanism.

Removing the earphone jack PCB And Mic Jack PCB (See Fig.22)

Prior to performing the following procedure, remove the top cover and both sides board. Also remove the CD changer unit. Also remove the front panel assembly. 1. Remove the screw with the washer, “ P ” that retains the earphone jack PCB.

Removing the control/FL PCB

(See Fig.23) Prior to performing the following procedure, remove the top cover and both sides board. Also remove the

CD changer unit.

Also remove the CD changer unit. Also remove the front panel assembly. 1. Remove the four screws “ Q ” that retain the control/FL

PCB from the back of the front panel unit.

1-13,

Removing the switch PCB and sound

mode and CD function switch PCB (See Fig.23 to 26) 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 and MIC Volume 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. 1-14,

Removing the cassette deck main motor,

and replacing the main belts (See Fig. 21, 27 and 28) 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. Remove the five screws “ z ” retaining the cassette deck mechanism. 2. Remove the cassette deck mechanism. 3. Remove the two screws “ t ” retaining the main motor from the front side of the cassette 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 attaching the main belts, use the longer belt for cassette A.

Removing the leaf switches of the cas-

sette deck mechanism (See Fig. 21 and 29) 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. Remove the five screws “ O ” that retain the cassette deck mechanism. 2. Remove the cassette deck mechanism. 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. 1-15,

Removing the cassette deck heads Removing the 3-pin regulator

(See Fig.21 to 30) (See Q904, Q907, 31) Prior to performing the following procedures, remove Prior to performing the following procedures, remove the top cover and both sides board. the top cover and both sides board. Also remove the CD changer unit. 1. Remove the two screws “ A ” that connect the heat Also remove the front panel assembly. sink cover to the rear panel. 1. Remove the five screws “ O ” that retain the cassette 2. Pull the heat sink outward. deck mechanism. 3. Remove the screw “ W ” that retains the heat sink the 2. Remove the cassette deck mechanism and place it so 3-pin terminal regulator Q904,Q907. that the front side faces up. 4. Remove the solder fixing the 3-pin regulator. 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. Fig.31 1-16,

Removing the power amp and supply PCB

and the power trans PCB (See Fig. 2, 32 to 34) Prior to performing the following procedures, remove the top cover and both sides board. Also remove heat sink cover.(Fig.3) 1. Remove the two screws “ A ” connecting the heat sink cover to the rear panel.(Fig.2) 2. Pull out the heat sink cover toward you. 3. Remove four(CA-MXK350V) screws “ AA” form the MX-K350V 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 ” and “ Y ” that retains the rear panel, and AC switch screw then remove the rear panel. 6. Disconnect the parallel wires from the connectors FW951 on the power trans PCB. 7. Remove the screw “ Z ” that retain the power amp and supply PCB and then remove the assembly. 8. Remove the clamp of AC power cord from the chassis. 9. Remove the four screws “ AB ” that retain the power trans PCB and then remove the assembly. 1-17,

Adjustment method

Measurement instruments required Adio input signal for adjustment AM modulation frequency : 400Hz 1. Low frequency oscillator Modulation factor : 30% FM modulation frequency : 400Hz This oscillator should have a capacity to output 0dB Frequency displacement : 22.5kHz to 600ohm at an oscillation frequency of 50Hz- 20kHz. Frequency Range 2. Attenuator impedance : 600ohm AM US: 531kHz~1629kHz (9kHz) 3. Electronic voltmeter 530kHz~1710kHz (10kHz) 4. Frequency counter UX: 531kHz~1602kHz (9kHz) 5. Wow flutter meter 530kHz~1600kHz (10kHz) 6. Test tape FM 87.5MHz~108MHz VT712 : For Tape speed and wow flutter ( 3kHz) VT703 : For Head angle(10kHz),Play back frequency Standard measurement positions of characteristics(1kHz), and dubbing fre- volume and switch quency characteristics (63,1,10kHz) Power: Standby (Light STANDBY Indicator) 7. Blank tape S, A, BASS : OFF TAPE I : AC-225 Sound mode : OFF 8. Torque gauge : For play and back tension forward ; Main VOL. : 0 Minimum TW2111A, Reverse ; TW2121A Fast Forward and Travers mecha set position : Disc 1 Rewind ; TW2231A Mic MIX VOL : MAX 9. Test disc: CTS-1000(12cm),GRG-1211(8cm), ECHO : OFF CD-T05A Precautions for measurement 10. Jitter meter 1. Apply 30pF and 33kohm to the IF sweeper output side 11. Television and 0.082 F and 100kohm in series to the sweeper input side. 2. The IF sweeper output level should be made as low as possible within the adjustable range. Measurement conditions 3. Since the IF sweeper is a fixed device, there is no (Select correct AC Line Volt.) need to adjust this sweeper. 4. Since a ceramic oscillator is used, there is no need to Power supply voltage perform any MPX adjustment. AC110/127/220/230-240V (50/60Hz) US/UX 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 Measurement case of simultaneously measuring the voltage in both output terminal : Speaker out of the input and output systems with an electronic : TP101(Measuring for TUNER voltmeter for two channels, therefore, the earth should DECK/CD/VCD) be connected particularly. : Dummy load 6ohm 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. 1-18,

Arrangement of adjusting positions Tape recorder section

Items Measurement Measurement method Standard Adjusting conditions values positions Cassette Head Test tape : 1. Playback the test tape VT703 (10KHz) or equivalent. Maximum output Adjust the Azimuth Alignments VT703 (10kHz) 2. Adjust the head azimuth screw to obtain maximum head azimuth Measurement output and both output of L / R is in 3dB. screw only output terminal : when the head Left and Right 3. Put on the screw lock paint after alignments. has been speaker output changed. (6-ohm loaded) or Headphone Output (32-ohm loaded) Recording Bias Test tape : 1. Insert the recording tape in deck-B. 80kHz+/-3kHz Use the High- Frequency Alignment TYPE I AC-225 2. Starting the recording. Impedance Measurement Probe or output terminal : 3. Adjust the oscillation frequency to 80KHz+/-3KHz Frequency Erase head by core of Oscillation coil of L301. counter input. terminal (CN308 8-Pin)

Tuner section

Items Measurement Standard Adjusting conditions Measurement method values positions AM Tracking Input signal: 1. Set the Signal Generator signal to 530KHz (529KHz) V.T : Adjust the OSC Alignments 530kHz (529kHz) the feed to Loop Antenna. 1.40V+/-0.05V coil only when 600kHz (603kHz) 2. Receiving the signal and the adjust the OSC coil (L2) the AM coil Adjustment obtain the V.T is 1.40V +/-0.05V. block has been point: Antenna coil (L2) 3. Change the receiving frequency to 600KHz (603KHz). changed. 4. Adjust the Antenna coil ( L2 ) obtain maximum Maximum sensitivity .(Adjust the SSG output to out of AGC sensitivity range.) AM IFT Input signal: 1. Set the receiving frequency to 530KHz (529KHz ). Maximum output Adjust the IFT Alignments 530kHz (529kHz) 2. Feed the 450KHz signal to AM antenna input. only when the Adjustment IFT block has point: IFT (T1) 3. Adjust the IFT Block T1 obtain to maximum output.(Adjust the SSG output to out of AGC been changed. range.) Note: The adjustment of CD section is not required. 1-19, Flow of functional operation until TOC read 1-20,

Maintenance of laser pickup Replacement 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. 1. The level of RF output (EFM output: ampli tude of eye pattern) will below. (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,

Description of major ICs

VIDEO CD PROCESSOR CHIP PINOUT VIDEO PC PROCESSOR CHIP PIN DESCRIPTION 1-22, VIDEO CD COMPANION CHIP 1. Pinout 1-23, 2. Pin description 1-24,

BA15218/BA15218F(IC102/IC852): Dual operational amplifier

1. Terminal layout & block diagram

BA3837(IC103): MIC Mixer

1. Terminal layout & block diagram 2. Pin function

BU9253AS(IC851): Low pass filter & echo mixer

1. Terminal layout & block diagram 2. Pin function 1-25,

TA8189N (IC401) : REC/PB amp.

1. Terminal layout 2. Block diagram 3. Pin function 1-26,

TC74HC4094AP (IC402) : 8-bit shift and store resister

1. Terminal layout 2. Block diagram 1-27,

TDA7440D (IC101) : Audio processor

1. Terminal layout 2. Block diagram 1-28, < MEMO>,

MX-K350V

VICTOR COMPANY OF JAPAN, LIMITED AUDIO & COMMUNICATION BUSINESS DIVISION PERSONAL & MOBILE NETWORK B.U.10-1, 1 Chome, Ohwatari-machi, maebashi-city, 371-8543, Japan

No.21166 Printed in Japan200212

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