JVC MXC-55-C, MXC-55-J Service manual

SERVICE MANUAL

COMPACT COMPONENT SYSTEM

MB50820066

MX-C55J,MX-C55C

ECO DISC SKIP

SP-MXC55 SP-MXC55CA-MXC55

Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)

TABLE OF CONTENTS

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

2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11

COPYRIGHT © 2006 Victor Company of Japan, Limited

No.MB508

2006/6

SPECIFICATION

Amplifier section
CA-MXC55

Tuner FM tuning range 87.50 MHz - 108.00 MHz

CD player CD Capacity 3 CDs

General Power requirement AC 120 V , 60 Hz

Speaker section
SP-MXC55

Output Power SUBWOOFERS 170 W per channel, min. RMS, driven into 3 Ω at

63 Hz with no more than 10% total harmonic distor­tion

MAIN SPEAKERS 80 W per channel, min. RMS, driven into 6 Ω at 1

kHz with no more than 10% total harmonic distor­tion

Audio input sensitivity/Impedance
(at 1 kHz, measured at MAIN SPEAKERS)

Speakers/Impedance Subwoofers 3 Ω - 6 Ω

AM tuning range 530 kHz - 1 710 kHz

Dynamic range 85 dB

Signal-to-noise ratio 85 dB

Power consumption 80 W /136 VA (at operation)

Dimensions (approx.) 270 mm × 317 mm × 402 mm (W/H/D)

Mass (approx.) 5.9 kg (13 lbs)

Type 3-way bass-reflex type

Speaker units Subwoofer 16 cm (6 5/16 in.) cone ×1

Power handling capacity Subwoofer 170 W

Impedance Subwoofer 3 Ω

Frequency range Subwoofer 30 Hz - 1 000 Hz

Sound pressure level Subwoofer 74 dB/W·m

Dimensions (approx.) 220 mm × 435 mm × 316 mm (W/H/D)

Mass (approx.) 5.7 kg (12.6 lbs) each

AUX 400 mV/47 kΩ

USB USB Version 1.1

Main speakers 6 Ω - 16 Ω

7.3 W (on standby)
1 W (in ECO mode)

(10 11/16 in. × 12 1/2 in. × 15 7/8 in.)

Main Woofer 10 cm (3 15/16 in.) cone ×1
Tweeter 5 cm (2 in.) cone ×1

Main speaker 80 W

Main speaker 6 Ω

Main speaker 100 Hz - 20 000 Hz

Main speaker 81 dB/W·m

(8 11/16 in. × 17 13/16 in. × 12 1/2 in.)

Design and specifications are subject to change without notice.

1-2 (No.MB508)

SECTION 1

PRECAUTION

1.1 Safety Precautions

(1) This design of this product contains special hardware and

many circuits and components specially for safety purpos­es. For continued protection, no changes should be made
to the original design unless authorized in writing by the
manufacturer. Replacement parts must be identical to
those used in the original circuits. Services should be per­formed by qualified personnel only.

(2) Alterations of the design or circuitry of the product should

not be made. Any design 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.

• 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, 1,000Ω 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 ex-

posed 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 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.

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.MB508)1-3

1.5 Important for laser products

1.CLASS 1 LASER PRODUCT

2.CAUTION :

(For U.S.A.) Visible and/or invisible class II laser radiation
when open. Do not stare into beam.
(Others) Visible and/or invisible class 1M laser radiation
when open. Do not view directly with optical instruments.

3.CAUTION : Visible and/or invisible laser radiation when
open and inter lock failed or defeated. Avoid direct
exposure to beam.

4.CAUTION : This laser product uses visible and/or invisible
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.

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 here in may result in
hazardous radiation exposure.

!

Please use enough caution not to

see the beam directly or touch it

in case of an adjustment or operation

check.

1-4 (No.MB508)

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

(No.MB508)1-5

SECTION 3

r

DISASSEMBLY

3.1 Main body section

3.1.1 Removing the top cabinet
(See Figs.1 and 2)

(1) From the both sides of the main body, remove the six

screws A attaching the top cabinet. (See Fig.1.)

(2) From the back side of the main body, remove the three

screws B attaching the top cabinet. (See Fig.2.)

(3) Take out the top cabinet from the main body while lifting the

rear section of the top cabinet in the direction of the arrow.
(See Fig.1.)

3.1.2 Removing the CD deck assembly
(See Figs.2 to 4)

• Remove the top cabinet.

(1) From the back side of the main body, remove the two

screws B attaching the CD deck assembly to the rear cab­inet. (See Fig.2.)

(2) From the bottom side of the CD deck assembly, turn the

gear cam in the direction of the arrow and draw the tray
disc out of the CD deck assembly in the direction of the ar­row 1. (See Figs.3 and 4.)

(3) Remove the CD door from the tray disc in the direction of

the arrow 2. (See Fig.4.)

(4) From the left side of the main body, disconnect the wire

from the connector CN103
Fig.4)

(5) Disconnect the card wire from the connector CW105

CD board. (See Fig.4)

(6) From the both sides of the main body, remove the two

screws D and then take out the CD deck assembly from the
main body. (See Fig.4.)

on the main AMP board. (See

on the

Gear cam

B

C

Rear cabinet

Fig.2

CD deck

OPEN

Top cabinet

Fig.1

A

Fig.3

2

CD board

Main AMP board

CW105

CD deck

Fig.4

D

CD doo

Tray disk

1

CN103

1-6 (No.MB508)

3.1.3 Removing the main AMP board

r

(See Figs.5 to 7)

• Remove the top cabinet and CD deck assembly.

(1) From the right side of the main body, remove the screw E

attaching the main AMP board to the main body. (See
Fig.5)

(2) From the top side of the main body, disconnect the wire

from the connector CN108
Fig.6.)

(3) Disconnect the card wire from the connector CN101

main AMP board. (See Fig.6.)

(4) Disconnect the wire from the connector CN102

AMP board. (See Fig.6.)

(5) Disconnect the wires from the connectors (SMCN01

SMCN02

(6) From the back side of the main body, remove the three

screws G attaching the main AMP board to the rear cabi­net. (See Fig.7.)

(7) Take out the main AMP board from the bottom cabinet.

3.1.4 Removing the SMPS board and rear cabinet

(See Figs.6 to 8)

• Remove the top cabinet, CD deck assembly and main AMP

board.
(1) From the top side of the main body, remove the screw F at-

taching the earth wire on the bottom cabinet. (See Fig.6.)

(2) From the back side of the main body, remove the three

screws H attaching the rear cabinet. (See Fig.7.)

(3) Remove the sections a toward this side and take out the

rear cabinet. (See Fig.7.)

(4) From the inside of the rear cabinet, remove the four screws

M attaching the SMPS board. (See Fig.8.)

(5) Release the claw b and take out the SMPS board from the

rear cabinet assembly. (See Fig.8.)

3.1.5 Removing the fan motor

(See Figs.7 and 8)

• Remove the top cabinet, CD deck assembly and main AMP

board.
(1) From the back side of the main body, remove the two

screws K attaching the fan motor to the rear cabinet. (See
Fig.7.)

(2) Take out the fan motor from the rear cabinet. (See Fig.8.)

) on the SMPS board. (See Fig.6.)

on the main AMP board. (See

on the

on the main

CN108

SMCN101

SMCN102

,

SMPS board

Main AMP board

CN101

CN102

F

Bottom cabinet

Fig.6

Rear cabinet

J

G

K

G

H

H

a

Fig.7

Rear cabinet

FAN moto

Main AMP board

E

Fig.5

Bottom cabinet

b

M

b

M

b

SMPS board

Fig.8

(No.MB508)1-7

3.1.6 Removing the front cabinet assembly
(See Figs.9 to 11)

• Remove the top cabinet and CD deck assembly.

(1) From the top side of the main body, remove the screw N at-

taching the earth wire on the bottom cabinet. (See Fig.9.)

(2) Disconnect the card wire from the connector CN101

main AMP board. (See Fig.10.)

(3) Disconnect the wire from the connector CN102

AMP board. (See Fig.10.)

(4) From the both sides of the main body, remove the two

screws P attaching the front cabinet assembly. (See
Fig.11.)

(5) From the both and bottom sides of the main body, release

the joints (c, d) and then take out the front cabinet assem­bly from the main body in the direction of the arrow. (See
Figs.11.)

on the

on the main

Front cabinet assembly

Bottom cabinet

N

Fig.9

Main AMP board

CN101

c

Bottom cabinet

P

CN102

Fig.10

Front cabinet assembly

d

d

1-8 (No.MB508)

Fig.11

3.1.7 Removing the VFD board

(See Figs.12 and 13)

• Remove the top cabinet, CD deck assembly and front cabinet

assembly.
(1) From the front side of the front cabinet assembly, pull out

the two knobs. (See Fig.12.)

(2) From the inside of the front cabinet assembly, remove the

seven screws Q attaching the VFD board. (See Fig.13.)

(3) Take out the VFD board from the front cabinet assembly

and then disconnect the wires from the connectors
(UW101
(See Fig.13.)

3.1.8 Removing the front board

• Remove the top cabinet, CD deck assembly, front cabinet as-

sembly and VFD board.
(1) From the inside of the front cabinet assembly, remove the

four screws R attaching the front board.

(2) Take out the front board from the front cabinet assembly.

, UW201, FW102, FW104) on the VFD board. .

(See Fig.12)

Fig.12

Front board

Knob

Front cabinet assembly

RR

Q

FW104

VFD board

FW102UW201UW101

Fig.13

(No.MB508)1-9

3.1.9 Removing the USB board
(See Fig.14)

• Remove the top cabinet, CD deck assembly, front cabinet as-

sembly, Knobs and VFD board.
(1) From the inside of the front cabinet assembly, remove the

three screws S attaching the USB board.

(2) Take out the USB board from the front cabinet assembly.

3.1.10 Removing the LED1 board, LED2 board and LED3
board
(See Fig.14)

• Remove the top cabinet, CD deck assembly, front cabinet as-

sembly, knobs and VFD board.
(1) From the inside of the front cabinet assembly, release the

claws e and then take out the LED1 board from the front

cabinet assembly.
(2) Remove the screw T attaching the LED2 board.
(3) Release the claw f and then take out the LED2 board from

the front cabinet assembly.
(4) Take out the LED3 board from the front cabinet assembly.

LED1 board

e

LED2 board

f

T

USB board

SSS

LED3 board

Fig.14

SECTION 4

ADJUSTMENT

This service manual does not describe ADJUSTMENT.

1-10 (No.MB508)

5.1 Amplifier

5.1.1 Power Malfunction

SECTION 5

TROUBLESHOOTING

Front pcb

u-com Vdd

normal?

YES

Front pcb dose

UX101(10MHz)

oscillate?

YES

Front pcb

When the power on

"H" pin

no.94(UIC01)

YES

CHECK the AMP PCB

AIC01,FIC01,WIC01,WIC02

NO

NO

SMIC42 input

voltage normal?

Check amp PCS

wire CN107

Front pcb p­sense voltage
normal?(#82)

Replace u-COM IC

NO

SMPS pcb

YES

YES

(UIC01)

SMIC01,SMD43

NO

Check the SMPS

NO

check the

SMD44

5.1.2 No Output

Amp pcb

AIC01,WIC01,02

pin No.4,7,12,15

B+ normal?

YES

Amp pcb

AIC01,pin No.51

normal?

(2.5 5V)

YES

Amp pcb

BIC01, pin No14

normal?(3.3V)

YES

Check the

master clock

(12.288MHz)

Check the FIC01

NO

NO

NO

Check

the SMPS

pcb SMIC02

YES

Check amp pcb

wire CN107

Check amp pcb

BIC02 pin #3,6,7

voltage(3.0 5V)

Replace of

BIC02

SMIC01,SMd43

NO

check the

(No.MB508)1-11

5.1.3 USB Malfunction

Front Jack

pcb UIC03 pin#10

voltage 5V

normal?

YES

NO

Check the USB cable

Front Jack

pcb UIC03 pin #7

voltage more than

2.5V? or normal?

Front jack pcb

JIC01 pin #14,15

analog signal

UIC02 pin #14

voltage 5V

Check the amp pcb

5.1.4 Compact Disc Player

CD playing N.G

YES

normal?

YES

Front pcb

normal?

YES

NO

NO

NO

Check the front pcb JIC01
pin #4 voltage
Check the oscillator
frequency 12MHz

Replace of JIC01

Check the amp pcb

EIC01 function IC

CD pack

5V,8V(motor)

normal?

1. CD pack to amp pcb
8 pin wire check
(CW106)

2. Amp pcb 5V,8V
supply check

Roulette

operating?

Check

pickup LD

LD and sied

operating?

Spindle

operationg?

1. Replace IC101

2. Replace IC201

1. Mecha reset

2. IC401 8V check

3. Mecha to CD pcb 8 pin cable check

4. CD pcb to front pcb 22 pin cable check

1. Pickup to CD pcb 6 pin wire check

2. Replace pickup

1. Check the Q302 output 3.3V

2. Check the IC101 pin No.6 voltage 3.3V

3. Check the IC301 pin No.21,22 voltage 8V

1. Check the IC201, JW11 voltage 1.2V

2. Check the Q303 output 2.0V

3. Check the IC201 pin No.87 reset normal?

1-12 (No.MB508)

5.1.5 SMPS

Standby LED

normal?

YES

Check

P-SENSE

NO NO

(smCN02

pin 9)

YES

Check amp pcb

Replace SMPS

Set play is

O.K.?

YES

Sound output

O.K.?

YES

Check

display circuit at

amp pcb

5.1.6 Tuner Malfunction (FM/AM)

Amp pcb t

tuner pack

pin No.4

voltage12V

normal?

Check

3V,5V,12V

(SMCN02 pin

NO NO

3,4,5,6 SMCN01

pin 9)

YES

Check AIC01

at amp pcb

Check

SMCN01

NO NO NO

pin 1 to 3

YES

Check

SMIC42,SMIC43

SMIC44 input

(pin No.1)

YES

Replace

SMIC42,43 or 44

SMNC01

pin 1, pin 4

short?

YES

Check amp pcb Check amp pcb

Check the Amp PCB SZ105

NO

Check the SMPS PCB SMIC44

Replace SMPS

NO

Replace SMPS

YES

Amp pcb

check the by-pass

condenser

EE01L,EE01R

YES

Amp pcb

check the

EIC02

pin #1,2

YES

Check the arround

EIC02, ER02R/L

EE10R/L

NO

Check the amp pcb ER01R,
ER01L open?
Check the amp pcb EIC1, EIC02
Rreplace tuner pack

Replace of EIC02

NO

(No.MB508)1-13

Victor Company of Japan, Limited
Audio/Video Systems Category 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan

(No.MB508)

Printed in Japan

VPT

SCHEMATIC DIAGRAMS

COMPACT COMPONENT SYSTEM

MX-C55J,MX-C55C

CD-ROM No.SML200606

ECO DISC SKIP

SP-MXC55 SP-MXC55CA-MXC55

Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)

Contents

Block diagrams
Standard schematic diagrams
Printed circuit boards

COPYRIGHT 2006 Victor Company of Japan, Limited.

2-1
2-3
2-11 to 17

No.MB508SCH

2006/6