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SERVICE MANUAL
COPYRIGHT
2001 VICTOR COMPANY OF JAPAN, LTD.
KS-AX4700
KS-AX4700
No. 49621
Apr. 2001
KS-AX4700
POWER AMPLIFIER
Printed in Japan
200104(S)
(No. 49621)
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
E
J
Continental Europe
Northern America


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KS-AX4700
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-AX4700
1-3
Location of main parts
REAR PANEL
HEAT SINK
INPUT for POWER
FUSE
OUTPUT TERMINAL (L/R)
FRONT PANEL
LOW INPUT (L)
HEAT SINK
LOW INPUT (R)
CONTROL PANEL
HEAT SINK
SWITCH KNOB
VOLUME KNOB


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KS-AX4700
1-4
GND wire
MAIN PCB
DIODE
SUB PCB
HEAT SINK
(Bottom view)
POWER TRANSISTER
POWER FET
POWER TRANSISTER


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KS-AX4700
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.
1.
2.
3.
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.)
1.
2.
Remove the 6 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.
3.
4.
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:
A
B
A
B
Top panel
C
C
Switch knob
Control panel
D
D
Volume knob