JVC KS-AX4500 Manuale utente

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

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.

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

KS-AX4500

1-4

GND wire

MAIN PCB

SUB PCB

DIODE POWER TRANSISTER

HEAT SINK

(Bottom view)

MAIN PCB POWER TRANSISTER

POWER FET

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

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.

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

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

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

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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