JVC KS-AX4500 Manuel utilisateur

SERVICE MANUAL

KS-AX4500KS-AX4500

No. 49622

Apr. 2001

KS-AX4500

POWER AMPLIFIER

Printed in Japan

200104(S)

(No. 49622)

VICTOR COMPANY OF JAPAN, LIMITED

MOBILE ELECTRONICS DIVISION

PERSONAL & MOBILE NETWORK B.U. 10-1,1Chome,Ohwatari-machi,Maebashi-city,Japan

Caution

If electricity is connected during disassembly, it must be a no load current. If it is load

current, be sure to attach a heat sink to the power-amp IC. This will be damaged if the

above precautions are not followed, as it does not have a sub heat sink attached to it.

Contents

Safety precaution

Location of main parts

Removal of main parts

Test method

Description of major ICs

1-2

1-3

1-5

1-7

1-8

Area Suffix

Continental Europe

Northern America

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KS-AX4500

1-2

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.

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KS-AX4500

1-3

Location of main parts

REAR PANEL

HEAT SINK

OUTPUT TERMINAL for FRONT(L/R)

INPUT for POWER FUSE OUTPUT TERMINAL for REAR(L/R)

FRONT PANEL

HIGH INPUT connector for REAR

LOW INPUT jack for REAR(L)

LOW INPUT jack for FRONT(L)

HIGH INPUT connector for FRONT

HEAT SINK

LOW INPUT jack for REAR(R)

LOW INPUT jack for FRONT(R)

CONTROL PANEL

HEAT SINK

SWITCH KNOB VOLUME KNOB

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KS-AX4500

1-4

GND wire

MAIN PCB

SUB PCB

DIODE POWER TRANSISTER

HEAT SINK

(Bottom view)

MAIN PCB POWER TRANSISTER

POWER FET

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KS-AX4500

1-5

From the bottom side of the main unit, remove the 4

screws A retaining the bottom cover.

Then remove the 6 screws B retaining the bottom

cover.

Remove the bottom cover.

Removal of main parts

Removing the bottom cover (see Fig. 1)

Remove the bottom cover from the main unit.

Loosen and remove the 2 screws C retaining the top

plate on the main unit. (Stoppers are attached to the

backs of the C screws so that they cannot be

removed easily.)

Remove the 4 volume knobs on top of the control

panel. If it cannot be pulled out easily, insert a rope

or wire between the base of the volume knob and the

control panel so that the volume knob is raised a little

above the surface and then remove it.

(Be careful when inserting a lever etc. not to

scratch the surface of the control panel).

Remove the 4 screws D retaining the control panel.

Then detach the control panel and the switch knobs.

Removing the MAIN PCB

(see Fig. 2 to 8)

(Side view)

Rope or wire

Volume knob

Control panel

Bottom cover

Fig. 1

Fig. 3

Fig. 2

Fig. 4

If electricity is connected during disassembly,

it must be a no load current. If it is load

current, be sure to attach a heat sink to the

power-amp IC. This will be damaged if the

above precautions are not followed, as it

does not have a sub heat sink attached to it.

CAUTION:

Top panel

Switch knob Control panel

D D

Volume knob

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KS-AX4500

1-6

Remove the 13 screws E retaining the panels on

both sides of the main unit.

Remove the MAIN PCB by lift up the arrow mark.7.

Remove the 14 screws F attaching the MAIN PCB to

the bottom of the main unit.

Fig. 7

Fig. 5

Fig. 6

Fig. 8

Rear panel

MAIN PCB

(Side view)

Front panel

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KS-AX4500

1-7

Test method

Check the voltage and frequency of the secondary

toroidal coil.

Measure the secondary toroidal coil, if the standard

frequency value of 22.87 kHz ± 50 Hz is not attained,

measure the R60 terminal, then adjust the SV01 so

that the R60 terminal becomes 22.87 kHz ± 50Hz.

Note:

TEST SET

FREQUENCY COUNTER

MAIN PCB

(+)

(

)

POWER SUPPLY

14.4V

60Vp-p

±2.5V

DC/DC CONVERTER SECOND GENERATOR SWITCHING

TEST ITEM

VOLTAGE TEST

FREQUENCY CHECK

60Vp-p±2.5V

22.87KHz±50Hz

OSCILLOSCOPE

VOLT/DIV: 10

TIME/DIV: 10mcec

SPECIFICATION CONDITION

FREQUENCY:22.87kHz ± 50Hz

VOLTAGE VALUE:60Vp-p ± 2.5V

When measuring, adjust and apply power

with no signal or load on each board.

R01

R60

R03

C01

J09

Q01

C31

C68

Measuring

Points

MAIN PCB

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KS-AX4500

1-8

PIN CONNECTIONS

(TOP View)

Noninv

Input

Inv

Input

Compen/PWN

Comp Input

Dead Time

Control

Ground

Noninv

Input

Inv

Input

Vref

Output

Control

VCC

Dead-Time

Comparator

Lockout

PWM

Comparator

Oscillator

Ck Q

Flip-

Flop

Reference

Regulator

0.7mA

0.7V

0.12V

3.5V

4.9V

7141615321

TL494

Description of major ICs

TEL 13942296513 QQ 376315150 892498299

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SERVICE MANUAL

KS-AX4500KS-AX4500

No. 49622

Apr. 2001

KS-AX4500

POWER AMPLIFIER

Printed in Japan

200104(S)

(No. 49622)

VICTOR COMPANY OF JAPAN, LIMITED

MOBILE ELECTRONICS DIVISION

PERSONAL & MOBILE NETWORK B.U. 10-1,1Chome,Ohwatari-machi,Maebashi-city,Japan

Caution

If electricity is connected during disassembly, it must be a no load current. If it is load

current, be sure to attach a heat sink to the power-amp IC. This will be damaged if the

above precautions are not followed, as it does not have a sub heat sink attached to it.

Contents

Safety precaution

Location of main parts

Removal of main parts

Test method

Description of major ICs

1-2

1-3

1-5

1-7

1-8

Area Suffix

Continental Europe

Nothem America

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KS-AX4500

2-1

Circuit block diagram

Q112,Q212

Q113,Q213

Q312,Q412

POWER

INPUT

+12V

D.C.

REM

F01

SV01

MUTE

CONTROL

MUTE

CONTROL

+/- 15V

VCC

VEE

Q80

Q300

Q400

Q05

~Q08

Q01

Q02

TRANS

T01

PROTECT

Q40,Q41

Q45,Q46

Q55,Q56

POWER

REGULATOR

POWER

CONTROL

U701

FRONT

R-IN

INPUT

AMP

POWER

AMP

Q100

Q200

FRONT

R-OUT

L-OUT

VR101A

U101

-A

U102

-A

VR102A

U103

-A

U104

-A

U104

-B

BASS BOOST

50Hz 0~12dB VARIABLE

CROSS OVER

80Hz 12dB/OCT FIXED

LPF

OFF

HPF

Q101~

Q111

L-IN

VR101B

U101

-B

FRONT

HI-INPUT

U102

-B

VR102B

U105

-A

U106

-A

U106

-B

LPF

OFF

HPF

Q201~

Q211

REAR

R-IN

INPUT

AMP POWER

AMP

REAR

R-OUT

L-OUT

VR301A

U301

-A

U302

-A

VR302A

U303

-A

U305

-A

U305

-B

BASS BOOST

50Hz 0~12dB VARIABLE

CROSS OVER

80Hz 12dB/OCT FIXED

LPF

SW301A

SW301B

OFF

HPF

Q301~

Q311

L-IN

VR301B

U301

-B

REAR

HI-INPUT

U302

-B

VR302B

U305

-A

U306

-A

U306

-B

LPF

OFF

HPF

Q401~

Q411

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