JVC KS-AX6700 Manuale utente

SERVICE MANUAL

KS-AX6700KS-AX6700

No. 49559

Jun. 2000

KS-AX6700

POWER AMPLIFIER

Printed in Japan

200006(S)

(No. 49559)

Contents

Safety Precaution

Location of main parts

Removal of main parts

Adjustment method

Wire connection diagram

1-2

1-3

1-5

1-8

1-9

VICTOR COMPANY OF JAPAN, LIMITED

MOBILE ELECTRONICS DIVISION

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

This service manual is printed on 100% recycled paper.

Areas suffix

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.

J -------- Nothem America

E ----- Continental Europe

KS-AX6700

1-2

Safety precaution

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-AX6700

1-3

Location of main parts Volume knob

Control panel

Switch knob

Heat sink

Rear panel

Input for power Fuse Output terminal

Heat sink

Front panel

Low input(L) High input connector

Heat sink

Low input(R)

KS-AX6700

1-4

CCFL P.C. board

Wire assemb'y

(from Main)

Main P.C. board

GND wire

Heat sink

(Bottom view)

Sub1 P.C. board

Main P.C. board

Sub2 P.C. board

2pin connector

(to CCFL P.C. board)

KS-AX6700

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.

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:

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 3 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).

Remove the 4 screws D retaining the control panel.

Then detach the control panel and the switch knob.

Removing the main P.C. board

(see Fig. 2 to 8)

(Side view)

Scale or suitable lever

Top plate

Volume knob

Control panel

Bottom cover

Fig. 1

Fig. 3

Fig. 2

Fig. 4

Volume knob

Switch knob

KS-AX6700

1-6

Remove the 6 screws E retaining the panels on both

sides of the main unit.

To remove the wire ass'y, lift up the main P.C. board

a little.

Remove the 13 screws F attaching the main P.C.

board to the bottom of the main unit.

(The GND wire that protrudes from the main

P.C.board must be re-installed to its original

position during re-assembly.)

Fig. 7

Fig. 5

GND wire

Main P.C. board

Wire assemb'y

Rear panel

Fig. 6

Front panel

Fig. 8

(Side view)

KS-AX6700

1-7

Remove the bottom cover.

Then remove the Main P.C. board.

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

screws G retaining the CCFL cover.

Then remove the insulation sheet on top of the CCFL

P.C. board.

Remove the 4 screws H retaining the CCFL P.C.

board.

Remove the CCFL P.C. board by sliding it a little

towards the arrow mark.

Removing the CCFL board

(see Fig. 9 to 12)

Fig. 9

Fig. 10

CCFL cover

G G

CCFL P.C. board

Insulation sheet

Fig. 11

CCFL P.C. board

Fig. 12

This section is cought

by the portion.

KS-AX6700

1-8

Adjustment method

Check the voltage and frequency of the secondary

toroidal coil.

Measure the secondary toroidal coil, if the standard

frequency value of 24.35 kHz ± 10 Hz is not attained,

measure the R760 terminal, then adjust the VR701

so that the R760 terminal becomes 24.25 kHz ± 10Hz.

Note:

TEST SET

FREQUENCY COUNTER

MAIN PCB

(+)

(

)

POWER SUPPLY

14.4V

R760

Measuring

Points

88Vp-p

±2.5V

DC/DC CONVERTER SECOND GENERATOR SWITCHING

TEST ITEM

VOLTAGE TEST

FREQUENCY CHECK

88Vp-p±2.5V

24.350KHz±10Hz

OSCILLOSCOPE

VOLT/DIV: 10

TIME/DIV: 10mcec

VARIABLE: MINIMUM

SPECIFICATION CONDITION

FREQUENCY:24.35kHz ±10Hz

VOLTAGE VALUE:55Vp-p

When measuring, adjust and apply power

with no signal or load on each board.

KS-AX6700

1-9

Wire connection diagram

HIGH INPUT connector

WHITE

WHITE/BLACK

GRAY

GRAY/BLACK

GND +12V

CCFL PCB

MAIN PCB

CCFL

RED

BLACK

SERVICE MANUAL

KS-AX6700KS-AX6700

No. 49559

Jun. 2000

KS-AX6700

POWER AMPLIFIER

Printed in Japan

200006(S)

(No. 49559)

Contents

Safety Precaution

Location of main parts

Removal of main parts

Adjustment method

Wire connection diagram

1-2

1-3

1-5

1-8

1-9

VICTOR COMPANY OF JAPAN, LIMITED

MOBILE ELECTRONICS DIVISION

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

This service manual is printed on 100% recycled paper.

Areas suffix

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.

J -------- Nothem America

E ----- Continental Europe

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