JVC KS-AX4500 Manuel utilisateur
SERVICE MANUAL
COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD.
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
E
J
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.
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 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.
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
CC
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.
5.
Remove the MAIN PCB by lift up the arrow mark.
7.
Remove the 14 screws F attaching the MAIN PCB to
the bottom of the main unit.
6.
Fig. 7
Fig. 5
Fig. 6
Fig. 8
Rear panel
E
E
E
E
MAIN PCB
F
MAIN PCB
(Side view)
Front panel
F
F
KS-AX4500
1-7
Test method
1.
.
Check the voltage and frequency of the secondary
toroidal coil.
2.
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.
5
6
7
3
R01
R60
R03
C01
J09
Q01
C31
C68
Measuring
Points
MAIN PCB
KS-AX4500
1-8
PIN CONNECTIONS
(TOP View)
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Noninv
Input
Inv
Input
Compen/PWN
Comp Input
Dead Time
Control
Ground
C1
CT
RT
Noninv
Input
Inv
Input
Vref
Output
Control
E2
E1
VCC
C2
Dead-Time
Comparator
UV
Lockout
PWM
Comparator
Oscillator
12
QD
Ck Q
Flip-
Flop
Q1
Q2
Reference
Regulator
0.7mA
0.7V
0.12V
3.5V
4.9V
8
13
9
11
10
12
7141615321
4
5
6
TL494
Description of major ICs
SERVICE MANUAL
COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD.
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
E
J
Continental Europe
Nothem America
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3
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