JVC KS-AX7300 Bedienungsanleitung
SERVICE MANUAL
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD. No.49808
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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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
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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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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
KS-AX7300
(No.49808)1-3
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
r
B
A
A
B
Top plate
CC
Volume knob
D
Switch knob
Control panel
D
(Side view)
Scale or suitable lever
Volume knob
Control panel
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
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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
E
Front panel
E
GND wire
MAIN PCB
F
F
MAIN PCB
Wire ass'y
(Side view)
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
KS-AX7300
(No.49808)1-5
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 G
CCFL PCB
Insulation sheet
H
CCFL PCB
H
This section is cought
by the portion.
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
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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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
(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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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
SCHEMATIC DIAGRAMS
POWER AMPLIFIER
No.49808SCH
2003/03
COPYRIGHT 2003 VICTOR COMPANY OF JAPAN, LTD.
KS-AX7300
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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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
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
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
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