JVC KS-AX7300 Manual de usuario

SERVICE MANUAL

2003/03

KS-AX7300

POWER AMPLIFIER

49808200303 KS-AX7300

TABLE OF CONTENTS

1 Important Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

2 Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

3 Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

Area suffix

J ------------ Northern America

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KS-AX7300

1-2 (No.49808)

SECTION 1

Important Safety Precautions

1.1 Safety Precautions

!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-AX7300

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SECTION 2

Disassembly method

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.

2.1 Removing the bottom cover (see Fig. 1)

(1) From the bottom side of the main unit, remove the 4 screws

Aretaining the bottom cover.

(2) Then remove the 6 screws Bretaining the bottom cover.

(3) Remove the bottom cover.

Fig.1

2.2 Removing the Main board (see Fig. 2 to 8)

(1) Remove the bottom cover from the main unit.

(2) Loosen and remove the 2 screws Cretaining the top plate

on the main unit. (Stoppers are attached to the backs of the

Cscrews so that they cannot be removed easily.)

(3) Remove the 6 volume knobs on top of the control panel. If

it cannot be pulled out easily, insert a scale or suitable lever

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).

(4) Remove the 4 screws Dretaining the control panel. Then

detach the control panel and the switch knobs.

Fig.2

Fig.3

Fig.4

Bottom cove

Top plate

Volume knob

Switch knob

Control panel

(Side view)

Scale or suitable lever

Volume knob

Control panel

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KS-AX7300

1-4 (No.49808)

(5) Remove the 6 screws Eretaining the panels on both sides

of the main unit.

(6) Remove the 10 screws Fattaching the Main board to the

bottom of the main unit.

(The GND wire that protrudes from the Main board

must be re-installed to its original position during re-

assembly.)

(7) To remove the wire ass'y, lift up the Main board a little.

Fig.5

Fig.6

Fig.7

Fig.8

Rear panel

Front panel

GND wire

MAIN PCB

Wire ass'y

(Side view)

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KS-AX7300

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2.3 Removing the CCFL board (see Fig. 9 to 12)

(1) Remove the bottom cover.

(2) Then remove the Main board.

(3) From the bottom side of the main unit, remove the 4 screws

Gretaining the CCFL cover.

(4) Then remove the insulation sheet on top of the CCFL

board.

(5) Remove the 4 screws Hretaining the CCFL board.

(6) Remove the CCFL board by sliding it a little towards the

arrow mark.

Fig.9

Fig.10

Fig.11

Fig.12

CCFL cover

G G

CCFL PCB

Insulation sheet

CCFL PCB

This section is cought

by the portion.

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KS-AX7300

1-6 (No.49808)

SECTION 3

Adjustment

3.1 Adjustment method

(1) Check the voltage and frequency of the secondary toroidal

coil.

FREQUENCY:24.35kHz ± 50Hz

VOLTAGE VALUE:55Vp-p

(2) Measure the secondary toroidal coil, if the standard

frequency value of 24.35 kHz ± 50 Hz is not attained,

measure the R760 terminal, then adjust the VR701 so that

the R760 terminal becomes 24.25 kHz ± 30Hz.

NOTE:

When measuring, adjust and apply power with no

signal or load on each board.

DC/DC CONVERTER SECOND GENERATOR SWITCHING

TEST SET

FREQUENCY COUNTER

Main board

(+)

(

)

POWER SUPPLY

14.4V

R760

Measuring

Points

Main board

55Vp-p

±2.5V

TEST ITEM

VOLTAGE TEST

FREQUENCY CHECK

55Vp-p±2.5V

24.350KHz±30Hz

OSCILLOSCOPE

VOLT/DIV: 10

TIME/DIV: 10mcec

SPECIFICATION CONDITION

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KS-AX7300

(No.49808)1-7

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(No.49808)

AV & MULTIMEDIA COMPANY MOBILE ENTERTAINMENT CATEGORY 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan

VICTOR COMPANY OF JAPAN, LIMITED

200303WPC

Printed in Japan

KS-AX7300

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SCHEMATIC DIAGRAMS

POWER AMPLIFIER

No.49808SCH

2003/03

KS-AX7300

Area Suffix

J Northern America

Contents

Block diagrams

Standard schematic diagrams

Printed circuit boards

2-1

2-2

2-8~11

CD-ROM No.SML200303

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KS-AX7300

!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.

Safety precaution

TEL 13942296513 QQ 376315150 892498299

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