JVC MXKB-30 Service manual

SERVICE MANUAL

COMPACT COMPONENT SYSTEM

MB15720042

MX-KB30

STANDBY/ON

SLEEP

AUX

FM MODE

FM /AM

CD

CD1CD2CD

3

PROGRAM/RANDOM

REPEAT

TAPE

A/B

SOUND

VOLUME

MODE

FADE

ACTIVE

SOUND

MUTING

BASS EX.

TURBO

CA-MXKB30SP-MXKB30 SP-MXKB30

Area Suffix

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

TABLE OF CONTENTS

1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

2 SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21

No.MB157

2004/2

SPECIFICATION

Amplifier Output Power 150 W per channel, min. RMS, driven into 6 Ω at 1kHz, with no more

than 10% total harmonic distortion Input Sensitivity/Impedance (1 kHz) AUX IN : 300 mV/50 kΩ Speaker terminals 6 - 16 Ω Phones 32 Ω - 1 kΩ

Cassette Deck Frequency Response

Type I (NORMAL) Wow And Flutter 0.15% (WRMS)

CD Player CD Capacity 3 CDs

Dynamic Range 85 dB Signal-To-Noise Ratio 85 dB Wow And Flutter Unmeasurable

Tuner FM Tuner Tuning Range : 87.5 MHz - 108.0 MHz

AM Tuner Tuning Range : 530 kHz - 1 710 kHz

Unit Dimensions 267 mm × 305 mm × 433 mm (W/H/D)

Mass Approx. 8.7 kg (19.2 lbs)

Speaker Specifications (each unit)

Power Specifications Power Requirements AC 120 V , 60 Hz

SP-MXKB30 3-way bass-reflex type Type Woofer: 16 cm (6-5/16") cone × 1 Speaker Unit Mid: 5cm (2") cone × 1

Power Handling Capacity 150 W Impedance 6 Ω Frequency Range 45 Hz - 22,000 Hz Sound pressure level 87 dB/W Dimensions 244 mm × 321 mm × 258 mm (W/H/D)

Mass Approx. 3.6 kg (8.0 lbs)

Power Consumption 135 W (power on mode)

15 mW/ch output into 32 Ω

63 Hz - 12 500 Hz

(10-9/16" × 12-1/16" × 17-1/16")

Tweeter: 2 cm (13/16") dome × 1

·m

(9-5/8" × 12-11/16" × 10-3/16")

18 W (in Standby mode)

Design and specifications are subject to change without notice.

1-2 (No.MB157)

SECTION 1

PRECAUTION

1.1 Safety Precautions

(1) This design of th is product contains special hardw are 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 manufacturers 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 reassembling.

(5) Leakage shock hazard testing

After reassembling 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.

• Pl ug 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, 1,000Ω per volt or more sensitivity in the following manner. Connect a 1,500Ω 10W resistor paralleled by a 0.15µF 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 measure the AC voltage across the resistor. Now, reverse the plug in the AC outlet and repeat each measurement. Voltage measured any must not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.).

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

0.15 F AC TYPE

Place this probe on

1500 10W

Good earth ground

1.2 Warning

(1) This equipment has been designed and manufactured to

meet international safety standards.

(2) It is the legal resp onsibility 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 compone nts are replaced

by approved parts.

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

voltage.

1.3 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.

1.4 Critical parts for safety

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. (This regulation dose not Except the J and C version)

each exposed metal part.

(No.MB157)1-3

1.5 Preventing 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.

1.5.1 Grounding to prevent damage by static electricity

Static electricity in the work area can destroy the optical pickup (laser dio de) in devices such as CD players. Be careful to use proper grounding in the area where repairs are being performed.

(1) Ground the workbench

Ground the workbench by laying conductive material (such as a conductive sh eet) or an iron plate over it before placing the traverse unit (optical pickup) on it.

(2) Ground yourself

Use an anti-static wrist strap to release any static electricity built up in your body.

(caption) Anti-static wrist strap

1M

Conductive material (conductive sheet) or iron palate

(3) Handling the optical pickup

• In order to maintain quality during transport and before instal lation, both sides of the laser di ode on the replacement optica l 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.

1.6 Handling the traverse unit (optical pickup)

(1) Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit. (2) 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 traverse unit. Be careful not to take too long

a time when attaching it to the connector. (3) Handle the flexible cable carefully as it may break when subjected to strong force. (4) I t is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.

1.7 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 sections before the flexible wir e is disconnected from the connector on the CD servo 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 sections after connecting the flexible wire.

CD changer

unit

1-4 (No.MB157)

Flexible cable

Soldering

1.8 Importance administering point on the safety

Caution: For continued protection against risk of fire, replace only with same type 3.15A/250V for F951 and 1.6A/250V for F952. This symbol specifies type of fast operating fuse.

Precaution: Pour eviter risques de feux, remplacez le fusible de surete de F951 comme le meme type que 3.15A/250V, et 1.6A/250V pour F952. Ce sont des fusibles suretes qui functionnes rapide.

^

(No.MB157)1-5

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

1-6 (No.MB157)

SECTION 3

DISASSEMBLY

3.1 Main body

3.1.1 Replacing the fuses (See Fig.1)

• Prio r to performing the following procedure, remove the top

cover. (1) Replace the fuse s inside.

Caution:

Be sure to use fuses with the specified ratings.

3.1.2 Replacing the power IC (See Fig.2)

• Prio r to performing the following procedure, remove the top

cover. (1) Remove the two screws A from the heat sink between the

power IC.

(2) Remove the solder fixing the power IC.

Fuse(F952)

1.6A 250V

Fuse(F951)

3.15A 250V

Fig.1

A

3.1.3 Replacing the heat sink cover (See Fig.3)

(1) Remove four screws B from the rear panel. (2) Pull the heat sink cover outward.

Fig.2

B

Fig.3

(No.MB157)1-7

3.1.4 Removing the top cover (See Fig.4 and 5)

(1) Remove six screws C that retain the top cover from the

panel rear of the body.

(2) Remove six screws D that retain the top cover from the two

sides of the body.

(3) Remove the top cover from the body by lifting it toward the

rear.

Top cover

C

Fig.4

Right Front panel assembly

Left Front panel assembly

D

C

D

DD

Fig.5

1-8 (No.MB157)

3.1.5 Removing the CD changer unit

y

(See Fig.6 to 9)

• Prio r to performing the following procedures, remove the top

cover.

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.

• From the fron t panel side of this set, push in the sections marked with arrows and pull out the CD tray toward the front.

• Remove the CD tray panel by pushing both of its extremities upward in the direction of the arrows.

• Push the CD tray deep into the set.

(1) Disconnect the cord wires from the CD board CN703

and

CN203.

(2) From the rear of the set, remove two screws E three screws

F and four screws G on the front panel left and right side.

(3) Handle the CD changer unit rear, take out the unit.

CD tray panel

E

Antenna terminal

F

Accessor terminal

Fig.8

Fig.6

CD changer unit

G

Fig.9

CD tray panel

Fig.7

(No.MB157)1-9

3.1.6 Removing the front panel assembly (See Fig.10 to 11)

• Prior to performing the following procedures, remove the top

cover.

• Also remove the CD changer unit.

(1) Disconnect the parallel wire and the cord wire from the

connectors CN701

(2) Remove one screws H retaining the front panel assembly

onto the bottom of the body.

(3) Remove two screws I on the left and right side of the set

retaining the panel front from the bottom and then remove then GND lug b that comes from the power amp and supply PCB.

(4) Disengage the claws c on both sides of the front panel

assembly and then remove the assembly.

, CN101 on the power amp. board.

*

Fig.10

Power amp and

supply PCB

GND lug b

Fig.11

I

Claw c

1-10 (No.MB157)

3.1.7 Removing the CD board

(See Fig.12 to 13)

• Prio r to performing the following procedures, remove the top

cover.

• Also remove the CD changer unit.

(1) Disconnect the wires from CN603A

on the CD board, which is located on the back side of the CD changer unit.

(2) The four screws J that retain the CD board should be

removed.

(3) Remove the CD board by pulling it toward the side where

the CN601

(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 connector CN601

main board and then remove the main board.

is located.

, CN603B and CN604

on the

CD PCB

J

Fig.12

CD PCB

CN601

Short round

Fig.13

(No.MB157)1-11

3.1.8 Removing the CD changer mechanism assembly (See Fig.14 to 15)

• Prior to performing the following procedures, remove the top

cover.

• Also remove the CD changer unit.

(1) Turn the CD changer mech anism cover base an d remove

the screws d connecting the unit to the CD changer mechanism assembly.

(2) Removing four screws e 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.

CD changer unit

CD changer mechanism assembly

Fig.14

e (Silver color)

Fig.15

d

e (copper color)

1-12 (No.MB157)

3.1.9 Removing the CD pickup

r

(See Fig.16)

• Prio r to performing the following procedures, remove the top

cover.

• 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, pu sh the sectio n g

in the direction of the arrow to remove the shaft, and th en remove the CD pickup.

CD pic kup

f

3.1.10 Replacing the loading motor and rotor belt of the CD changer

(See Fig .17)

• Prio r to performing the following procedures, remove the top

cover.

• Al so open the CD changer tray.

(1) Remove the two screws L retaining the CD cha nger 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.

3.1.11 Replacing the CD turn table and removing the motor

(See Fig. 18)

• Prio r 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 sto pper 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 chang er 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.

g

Shaft

Fig.16

M

L

Fig.17

Turn table motor

Motor locker

Obligue gea

Fig.18

(No.MB157)1-13

3.1.12 Removing the cassette deck mechanism (See Fig.19)

• Prior to performing the following procedures, remove the top

cover.

• Also remove the CD changer unit.

• Also remove the front panel assembly.

(1) Remove six screws Z retaining the cassette deck

mechanism.

3.1.13 Removing the earphone jack board (See Fig.20)

• Prior to performing the following procedures, remove the top

cover.

• 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.

KEY 1 PCB

Front panel assembly

Z

Fig.19

Front panel assembly

Earphone jack PCB

P

3.1.14 Removing the control/FL board (See Fig.21)

• Prior to performing the following procedures, remove the top

cover.

• Also remove the CD changer unit.

• Also remove the front panel assembly.

(1) Remove six screws Q that retain the control/FL PCB from

the back of the front panel unit.

Q

KEY 2 PCB

Fig.20

Front panel assembly

Q

Control/FL PCB

Fig.21

1-14 (No.MB157)

3.1.15 Removing the switch board and sound mode and CD function switch board

y

(See Fig.20 to 23)

• Prio r to performing the following procedures, remove the top

cover.

• 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.(Fig.22)

(2) Remove six screws Q retaining the front panel

assembly.(Fig.21) (3) Remove the control/FL board. (4) Remove eleven screws R retaining the switch (key 1)

board.(Fig.20) (5) Remove two screws S retaining the sound mode and CD

function (key 2) switch board.(Fig.21)

Volume Knob

Front panel assembl

Fig.22

Front panel assembly

Volume shaft

Fig.23

(No.MB157)1-15

3.1.16 Removing the leaf switches of the cassette deck mechanism

r

(See Fig. 19 and 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) Remove the six screws Z that retain the cassette deck

mechanism. (Fig.19) (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.

3.1.17 Removing the cassette deck main motor, and replacing the main belts (See Fig.19, 24 and 25)

• 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 six screws Z retaining the cassette deck

mechanism. (Fig.19) (2) Remove the cassette deck mechanism. (3) Remove 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.

Cassette dec k mechanism

(Bac k side)

Main belt (For B cassete)

Solder side of leaf switch

(Frint side)

t

Fig.24

Casset dec k main moto

Main belt (For A cassete)

Fig.25

1-16 (No.MB157)

Cassette dec k mechanism

(Bac k side)

Fig.26

3.1.18 Removing the cassette deck heads (See Fig. 19 and 27)

• Prio r 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 six screws Z that retain the cassette deck

mechanism. (Fig.19)

(2) Remove the cassette deck mechanism and place 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 screw U that retains the head. (5) Remove screw V that retains the head. (6) Hold the head and slide it in the direction of the arrow to

remove it.

3.1.19 Removing the 3-pin regulator and bridge diode (See Q904

• Prio r to performing the following procedures, remove the top

cover and both sides board. (1) Remove two screws A that connect the heat sink. (2) Remove two screws W that connect the heat sink. (3) Remove the solder fixing the the 3-pin terminal regulator

Q904

(4) Remove the solder fixing the 4-pin bridge diode (D901,

D914

, Q907, D901, D914 and Fig.28)

, Q907. ).

PB Head

Cassette dec k mechanism

(Front side)

V

U

Fig.27

WA

U

V

REC/PB Head

Fig.28

(No.MB157)1-17

3.1.20 Removing the power amp and supply board and the power trans board

A

(See Fig. 3, 29 to 31)

• Prior to performing the following procedures, remove the top cover and CD changer unit. (1) Remove four screws B from the rear panel. (Fig.3) (2) Pull the heat sink cover outward. (3) Remove four screws AA from the rear panel between the

heat sink holder.

(4) Remove two screws X that retain the speaker terminals

and AUX terminal.

(5) Remove screws YY that retains the rear panel, and then

remove the rear panel.

(6) Disconnect the parallel wires from the connectors FW951

on the power trans board. (7) Remove the clamp of AC power cord from the chassis. (8) Remove four screws AB that retain the pow er trans board

and then remove the assembly.

Fuse(F952)

1.6A 250V

A

Fuse(F951)

3.15A 250V

Fig.29

Power amp and supply PCB

X

Clamp

YY

Fig.30

Rear panel

AB Chassis

Fig.31

1-18 (No.MB157)

SECTION 4

ADJUSTMENT

4.1 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 50Hz-20kHz. (2) Attenuator impedance : 600Ω (3) Electronic voltmeter (4) Frequency counter (5) Wow flutter meter (6) Test tape

VT712 : For Tape speed and wow flutter ( 3kHz)

VT703 : For Head angle (10kHz) (7) Blank tape

TAPE I : AC-225

TAPE II : AC-514 (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

4.2 Measurement conditions

Power supply voltage : AC 120V (60Hz) Measurement output terminal : Speaker out : TP101(Measuring for TUNER/DECK/CD) : Dummy load 6Ω

4.3 Radio input signal

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

4.4 Frequency Range

AM : 530kHz~1710kHz FM : 87.5MHz~108MHz

4.5 Standard measurement positions of volume and switch

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

4.6 Precautions for measurement

(1) Apply 30pF and 33k<ohm> to the IF sweeper output side

and 0.082<micro>F and 100kohm in series to the sweeper input side.

(2) The IF sweeper output level should be made as low as pos-

sible within the adjustable range.

(3) Since the IF sweep er is a fixed device, there is no need to

adjust this sweeper.

(4) Since a ceramic oscillator is used, there is no need to per-

form 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 systems with anelectronic voltmeter for two channels, therefore, the earth 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.

(No.MB157)1-19

4.7 Arrangement of adjusting positions

Cassette deck mechanism (Front side)

PB Head

k-A)

(Dec

Head azimuth screw

(Forward side)

Head azimuth screw

erse side)

(Rev

4.8 Tape recorder section

Items

Cassette Head Azimuth Alignments

Measurement

conditions

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

REC/PB Head (Deck-B)

Head azimuth screw

(Forw

ard side)

Head azimuth screw

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

2. Adjust the head azimuth screw to obtain maximum

3. Put on the screw lock paint after alignments.

(Reverse side)

Measurement method

output and both output of L / R is in 3dB.

Standard

values

Maximum output

Adjusting

positions

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

Recording Bias F

requency Alignment

Test tape : TYPE I AC-514 Measurement output terminal

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.

: Erase head terminal (CN308 8-Pin)

4.9 Tuner section

Items

AM Tracking Alignments

Measurement

conditions

Input signal : 530kHz

600kHz

Adjustment point : Antenna coil (L2)

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

2. Receiving the signal and the adjust the OSC coil (L2) obtain the V.T is 1.40V +/-0.05V.

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

4. Adjust the Antenna coil ( L2 ) obtain maximum sensitivity. (Adjust the SSG output to out of AGC range.)

AM IFT Alignments

Input signal : 530kHz Adjustment point : IFT (T1)

1. Set the receiving frequency to 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.

Measurement method

80kHz+/-3kHz

Standard

values

V. T : 1.40V+/-0.05V

Maximum sensitivity

Maximum output

Use the HighImpedance Probe or Frequency counter input.

Adjusting

positions

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

Adjust the IFT only when the IFT block has been changed.

1-20 (No.MB157)

SECTION 5

TROUBLESHOOTING

This service manual does not describe TROUBLESHOOTING.

(No.MB157)1-21

1-22 (No.MB157)

VICTOR COMPANY OF JAPAN, LIMITED

AV & MULTIMEDIA COMPANY AUDIO/VIDEO SYSTEMS CATEGORY 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan

(No.MB157)

Printed in Japan

WPC

SERVICE MANUAL

COMPACT COMPONENT SYSTEM

MB15720042

MX-KB30

STANDBY/ON

SLEEP

AUX

FM MODE

FM /AM

CD

CD1CD2CD

3

PROGRAM/RANDOM

REPEAT

TAPE

A/B

SOUND

VOLUME

MODE

FADE

ACTIVE

SOUND

MUTING

BASS EX.

TURBO

CA-MXKB30SP-MXKB30 SP-MXKB30

Area Suffix

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

TABLE OF CONTENTS

1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

2 SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21

No.MB157

2004/2

SPECIFICATION

Amplifier Output Power 150 W per channel, min. RMS, driven into 6 Ω at 1kHz, with no more

than 10% total harmonic distortion Input Sensitivity/Impedance (1 kHz) AUX IN : 300 mV/50 kΩ Speaker terminals 6 - 16 Ω Phones 32 Ω - 1 kΩ

Cassette Deck Frequency Response

Type I (NORMAL) Wow And Flutter 0.15% (WRMS)

CD Player CD Capacity 3 CDs

Dynamic Range 85 dB Signal-To-Noise Ratio 85 dB Wow And Flutter Unmeasurable

Tuner FM Tuner Tuning Range : 87.5 MHz - 108.0 MHz

AM Tuner Tuning Range : 530 kHz - 1 710 kHz

Unit Dimensions 267 mm × 305 mm × 433 mm (W/H/D)

Mass Approx. 8.7 kg (19.2 lbs)

Speaker Specifications (each unit)

Power Specifications Power Requirements AC 120 V , 60 Hz

SP-MXKB30 3-way bass-reflex type Type Woofer: 16 cm (6-5/16") cone × 1 Speaker Unit Mid: 5cm (2") cone × 1

Power Handling Capacity 150 W Impedance 6 Ω Frequency Range 45 Hz - 22,000 Hz Sound pressure level 87 dB/W Dimensions 244 mm × 321 mm × 258 mm (W/H/D)

Mass Approx. 3.6 kg (8.0 lbs)

Power Consumption 135 W (power on mode)

15 mW/ch output into 32 Ω

63 Hz - 12 500 Hz

(10-9/16" × 12-1/16" × 17-1/16")

Tweeter: 2 cm (13/16") dome × 1

·m

(9-5/8" × 12-11/16" × 10-3/16")

18 W (in Standby mode)

Design and specifications are subject to change without notice.

1-2 (No.MB157)