Download KS-AX4500

KS-AX4500
KS-AX4500
SERVICE MANUAL
POWER AMPLIFIER
KS-AX4500
Area Suffix
E
J
Continental Europe
Northern America
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
VICTOR COMPANY OF JAPAN, LIMITED
MOBILE ELECTRONICS DIVISION
PERSONAL & MOBILE NETWORK B.U. 10-1,1Chome,Ohwatari-machi,Maebashi-city,Japan
(No. 49622)
Printed in Japan
200104(S)
COPYRIGHT
2001 VICTOR COMPANY OF JAPAN, LTD.
No. 49622
Apr. 2001
KS-AX4500
! 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.
1-2
KS-AX4500
Location of main parts
HEAT SINK
CONTROL PANEL
SWITCH KNOB
VOLUME KNOB
HEAT SINK
REAR PANEL
INPUT for POWER
FUSE
OUTPUT TERMINAL for REAR(L/R)
OUTPUT TERMINAL for FRONT(L/R)
LOW INPUT jack for REAR(R)
LOW INPUT jack for FRONT(R)
HEAT SINK
FRONT PANEL
HIGH INPUT connector for REAR
HIGH INPUT connector for FRONT
LOW INPUT jack for FRONT(L)
LOW INPUT jack for REAR(L)
1-3
KS-AX4500
HEAT SINK
(Bottom view)
GND wire
MAIN PCB
SUB PCB
POWER TRANSISTER
DIODE
POWER FET
1-4
MAIN PCB
POWER TRANSISTER
KS-AX4500
Removal of main parts
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.
B
Bottom cover
Removing the bottom cover (see Fig. 1)
1. From the bottom side of the main unit, remove the 4
screws A retaining the bottom cover.
A
2. Then remove the 6 screws B retaining the bottom
cover.
3. Remove the bottom cover.
A
B
Fig. 1
Top panel
Removing the MAIN PCB
(see Fig. 2 to 8)
1. Remove the bottom cover from the main unit.
2. 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.)
C
C
Fig. 2
3. 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).
Volume knob
D
D
Switch knob
Control panel
Fig. 3
4. Remove the 4 screws D retaining the control panel.
Then detach the control panel and the switch knobs.
Rope or wire
Volume knob
Control panel
(Side view)
Fig. 4
1-5
KS-AX4500
5. Remove the 13 screws E retaining the panels on
both sides of the main unit.
E
Rear panel
E
Fig. 5
E
Front panel
E
Fig. 6
F
6. Remove the 14 screws F attaching the MAIN PCB to
the bottom of the main unit.
F
F
MAIN PCB
Fig. 7
MAIN PCB
7. Remove the MAIN PCB by lift up the arrow mark.
(Side view)
Fig. 8
1-6
KS-AX4500
Test method
1. Check the voltage and frequency of the secondary
toroidal coil.
.
FREQUENCY COUNTER
FREQUENCY:22.87kHz ± 50Hz
VOLTAGE VALUE:60Vp-p ± 2.5V
POWER SUPPLY
TEST SET
14.4V
MAIN PCB
(+)
(-)
5
6
7
R01
Measuring
Points
3
Q01
C01
C68
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.
J09
R60
C31
R03
Note: When measuring, adjust and apply power
with no signal or load on each board.
MAIN PCB
DC/DC CONVERTER SECOND GENERATOR SWITCHING
TEST ITEM
SPECIFICATION
VOLTAGE TEST
60Vp-p±2.5V
FREQUENCY CHECK
22.87KHz±50Hz
CONDITION
OSCILLOSCOPE
VOLT/DIV: 10
TIME/DIV: 10mcec
60Vp-p
±2.5V
1-7
KS-AX4500
Description of major ICs
PIN CONNECTIONS
Noninv
Input
1
16
Noninv
Input
Inv
Input
2
15
Inv
Input
Compen/PWN
Comp Input
3
14
Vref
Dead Time
Control
4
13
Output
Control
CT
5
12
VCC
RT
6
11
C2
Ground
7
10
E2
C1
8
9
E1
(TOP View)
TL494
13
8
6
Oscillator
D
5
Q
Q1
9
FlipFlop
Dead-Time
Comparator
Ck
0.12V
11
Q
Q2
10
4
0.7V
12
4.9V
PWM
Comparator
0.7mA
1
UV
Lockout
Reference
Regulator
2
3.5V
1
1-8
2
3
15 16
14
7
KS-AX4500
KS-AX4500
SERVICE MANUAL
POWER AMPLIFIER
KS-AX4500
Area Suffix
E
J
Continental Europe
Nothem America
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
VICTOR COMPANY OF JAPAN, LIMITED
MOBILE ELECTRONICS DIVISION
PERSONAL & MOBILE NETWORK B.U. 10-1,1Chome,Ohwatari-machi,Maebashi-city,Japan
(No. 49622)
Printed in Japan
200104(S)
COPYRIGHT
2001 VICTOR COMPANY OF JAPAN, LTD.
No. 49622
Apr. 2001