JVC KS-AX6700 User manual

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
COPYRIGHT 2000 VICTOR COMPANY OF JAPAN, LTD.
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.
1.
2.
3.
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.)
1.
2.
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.
3.
4.
Removing the main P.C. board
(see Fig. 2 to 8)
(Side view)
Scale or suitable lever
D
Top plate
C
Volume knob
Control panel
Bottom cover
B
Fig. 1
Fig. 3
Fig. 2
Fig. 4
A
D
C
A
B
Volume knob
Switch knob

KS-AX6700
1-6
Remove the 6 screws E retaining the panels on both
sides of the main unit.
5.
To remove the wire ass'y, lift up the main P.C. board
a little.
7.
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.)
6.
Fig. 7
Fig. 5
GND wire
Main P.C. board
Main P.C. board
Wire assemb'y
F
F
Rear panel
E
Fig. 6
Front panel
E
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.
1.
2.
3.
Then remove the insulation sheet on top of the CCFL
P.C. board.
4.
Remove the 4 screws H retaining the CCFL P.C.
board.
5.
Remove the CCFL P.C. board by sliding it a little
towards the arrow mark.
6.
Removing the CCFL board
(see Fig. 9 to 12)
Fig. 9
Fig. 10
CCFL cover
G
G G
H
CCFL P.C. board
Insulation sheet
Fig. 11
CCFL P.C. board
H
Fig. 12
This section is cought
by the portion.

KS-AX6700
1-8
Adjustment method
1.
.
Check the voltage and frequency of the secondary
toroidal coil.
2.
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
L
R
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
COPYRIGHT 2000 VICTOR COMPANY OF JAPAN, LTD.
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
2-1
Block diagram
R-IN
L-IN
R
L
HI-INPUT
INPUT
AMP
U101
-A
U101
-B
U102
-A
U102
-B
U106
-A
U206
-A
VR103A
VR103B
U103
-A
U103
-B
U104
-A
U104
-B
VR102A
VR102B
U105
-A
U105
-B
SW101A
SW101B
LPF
HPF
OFF
LPF
HPF
OFF
Q142-Q146
Q148,Q149
Q152
Q161-Q166
R-OUT
L-OUT
POWER
INPUT
+12V
D.C.
REM
F01,F02
Q701
Q702 U701
POWER
CONTROL
Q730,Q731
Q745-Q747
Q755-Q757
POWER
REGULATOR
T1
U703
U704
TRANS
& REGULATOR
+/-15V
VCC
VEE
Q150
Q250
MUTE
CONTROL
Q705
-708
Q171-Q176
Q272
PROTECT
VR101B
VR101A
VR102C
VR102D
7
6
2 2
1 1
6
7
POWER
AMP
Q790
CCFL+12V INVERTER LOAD
CCFL
board
Q780
VR701
Q242-Q246
Q248,Q249
Q252
Q261-Q266
BOOST 0-12dB CROSSOVER
31 3131
6731
57
312121
576767
VARIABLE/INV.CIRCUIT(Gain1)/Amplifier 50-250Hz 12dB/OCT VARIABLE

6
5
4
3
2
1
BCDEFGH I JA
7
KS-AX6700
2-2
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.
Indicates main signal
Standard schematic diagrams
Main board and sub [1/2] /sub2 board circuit diagram
SUB2 PCB SUB1 PCB

6
5
4
3
2
1
BCDEFGH I JA
7
KS-AX6700
2-3
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.
Main board [2/2] and CCFL board circuit diagram
CCFL PCB
Parts are safety assurance parts.
When replacing those parts make
sure to use the specified one.
CCFL - Inverter board

6
5
4
3
2
1
BCDEFGH I JA
7
KS-AX6700
2-4
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.
Printed circuit boards
Main board
Surface side view

6
5
4
3
2
1
BCDEFGH I JA
7
KS-AX6700
2-5
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.
Bottom side view

6
5
4
3
2
1
BCDEA
7
KS-AX6700
Sub1/sub2 P.C. board (Volume board)
CCFL P.C. board
2-6

KS-AX6700
3-1
PARTS LIST
* All printed circuit boards and its assemblies are not available as service parts.
- Contents -
Exploded view of enclosure assembly and parts list
Electrical parts list
Packing and accessories
KS-AX6700
3-2
3-4
3-10
Areas suffix
J --------------- Nothem America
E ------------ Continental Europe

KS-AX6700
3-2
CONTROL
P
ANEL
This parts is WR1 of the electrical parts list.
Exploded view of enclosure assembly and parts list
Block No.
MM
M
1

KS-AX6700
3-3
Item Parts number Parts name AreaQ'ty Description
1 MAHS070047-2 HEAT SINK 1
2 MAFP076019-1 FRONT PANEL 1
3 MARP706021-1 REAR PANEL 1
4 MABC076014-1 BOTTOM COVER 1
5 MATC041489-1 CONTROL PANEL 1
6 MASO051491-1 CCFL COVER 1
7 MABR031494-0 TR BRACKET
(
A
)
2
8 MABR031493-0 TR BRACKET
(
B
)
1
9 MABR031495-0 TR BRACKET
(
C
)
1
10 MOCU011504-2 TR BRACKET CUS 4
11 MOCU011503-2 TR BRACKET CUS 2
12 MOCU011505-2 TR BRACKET CUS 2
13 MASP001519-0 SILICON PAD
(
A
)
2
14 MASP001509-0 SILICON PAD
(
B
)
1
15 MASP001520-0 SILICON PAD
(
C
)
1
16 MAPO022903-0 PIPE 1
17 MATC036022-1 TOP PLATE 1
18 MAIL001501-1 ILLUMINATOR 1
19 MOKB076023-1 VOLUME KNOB 3
20 MOKB076024-1 SWITCH KNOB 1
21 MOWA051506-0 POLY WASHER 2
22 MABU031496-0 WIRE BUSHING 1
23 MOCU111508-0 INSULATION SHEE 1
24 MOCU111535-1 INSULATION SHEE 1
25 MOFI011538-0 FIBER PLATE 1
26 MOCU011511-1 CCFL CUSHION
(
A
)
1
27 MOCU011512-0 CCFL CUSHION
(
B
)
2
28 MOCU001521-0 RUBBER CUSHION 1
29 MOCU014097-0 RUBBER CUSHION 1
30 MOCU014097-0 RUBBER CUSHION 2
31 MOCU021701-0 FIBER CUSHI 3
33 MOCU061498-0 EVA CUSHION 2
34 MNSC00140-9.3 SCREW 2
36 MNSC00740-14 SCREW 13
37 MBSC03230-08 SCREW 6
38 MBSC00230-06 SCREW 14
39 MNSC00630-06 SCREW 8
40 MBSC04330-05 SCREW 4
41 MBSC00330-08 SCREW 6
A
Parts list ( Enclosure assembly
)
Block No. M1MM

KS-AX6700
3-4
Item Parts number Parts name Area Remarks
C 101 ELE4.7/50VSMS CAPACITOR ELECTROLYTIC SM
C 102 ELE4.7/50VSMS CAPACITOR ELECTROLYTIC SM
C 104 CER22PF50VNPO CAPACITOR CERAMIC DISK 50
C 105 CER100PF50VNPO CAPACITOR CERAMIC DISK 50
C 106 CER22PF50VNPO CAPACITOR CERAMIC DISK 50
C 119 ELE4.7/50VSMS CAPACITOR ELECTROLYTIC SM
C 120 CER100PF50VNPO CAPACITOR CERAMIC DISK 50
C 121 CER104PF50V CAPACITOR CERAMIC DISK 50
C 122 CER104PF50V CAPACITOR CERAMIC DISK 50
C 123 CER104PF50V CAPACITOR CERAMIC DISK 50
C 124 CER104PF50V CAPACITOR CERAMIC DISK 50
C 142 CER104PF50V CAPACITOR CERAMIC DISK 50
C 143 MAL224J63VTL CAPACITOR MYLAR 5% 63V T
C 144 CER104PF50V CAPACITOR CERAMIC DISK 50
C 145 ELE100/63VSMS CARBON RESISTOR ELECTROLYTIC S
C 146 CER100PF50VNPO CAPACITOR CERAMIC DISK 50
C 147 CER100PF50VNPO CAPACITOR CERAMIC DISK 50
C 148 CER5PF50VNPO CAPACITOR CERAMIC DISK 50
C 149 ELE100/16VSMS CAPACITOR ELECTROLYTIC SM
C 160 ELE4.7/50VSMS CAPACITOR ELECTROLYTIC SM
C 161 ELE4.7/50VSMS CAPACITOR ELECTROLYTIC SM
C 162 CER102PF50VCH CAPACITOR AXIAL CERAMIC 5
C 163 CER102PF50VCH CAPACITOR AXIAL CERAMIC 5
C 171 ELE100/50VSMS CARBON RESISTOR ELECTROLYTIC S
C 172 CER102PF50V CAPACITOR CERAMIC DISK 50
C 173 ELE100/16VSMS CAPACITOR ELECTROLYTIC SM
C 190 ELE330/16VSMS CAPACITOR ELECTROLYTIC S
C 191 MAL104J63VTL CAPACITOR MYLAR 5% 63V T
C 201 ELE4.7/50VSMS CAPACITOR ELECTROLYTIC SM
C 202 ELE4.7/50VSMS CAPACITOR ELECTROLYTIC SM
C 204 CER22PF50VNPO CAPACITOR CERAMIC DISK 50
C 205 CER100PF50VNPO CAPACITOR CERAMIC DISK 50
C 206 CER22PF50VNPO CAPACITOR CERAMIC DISK 50
C 219 ELE4.7/50VSMS CAPACITOR ELECTROLYTIC SM
C 220 CER100PF50VNPO CAPACITOR CERAMIC DISK 50
C 242 CER104PF50V CAPACITOR CERAMIC DISK 50
C 243 MAL224J63VTL CAPACITOR MYLAR 5% 63V T
C 244 CER104PF50V CAPACITOR CERAMIC DISK 50
C 245 ELE100/63VSMS CARBON RESISTOR ELECTROLYTIC S
C 246 CER100PF50VNPO CAPACITOR CERAMIC DISK 50
C 247 CER100PF50VNPO CAPACITOR CERAMIC DISK 50
C 248 CER5PF50VNPO CAPACITOR CERAMIC DISK 50
C 249 ELE100/16VSMS CAPACITOR ELECTROLYTIC SM
C 260 ELE4.7/50VSMS CAPACITOR ELECTROLYTIC SM
C 261 ELE4.7/50VSMS CAPACITOR ELECTROLYTIC SM
C 262 CER102PF50VCH CAPACITOR AXIAL CERAMIC 5
C 263 CER102PF50VCH CAPACITOR AXIAL CERAMIC 5
C 291 MAL104J63VTL CAPACITOR MYLAR 5% 63V T
C 345 ELE470/16VSMS CAPACITOR ELECTROLYTIC S
C 701 ELE10/25VSMS CAPACITOR ELECTROLYTIC SM
C 705 ELE47/25VSMS CAPACITOR ELECTROLYTIC SM
C 706 CER104PF50V CAPACITOR CERAMIC DISK 50
C 715 CER104PF50V CAPACITOR CERAMIC DISK 50
C 716 MAL334J63VTL CAPACITOR MYLAR 5% 63V T
C 717 ELE47/16VSMS CAPACITOR ELECTROLYTIC SM
C 718 ELE220/16VSMS CAPACITOR ELECTROLYTIC S
C 720 CER104PF50V CAPACITOR CERAMIC DISK 50
C 721 ELE10/25VSMS CAPACITOR ELECTROLYTIC SM
C 722 ELE47/25VSMS CAPACITOR ELECTROLYTIC SM
C 724 CER104PF50V CAPACITOR CERAMIC DISK 50
C 725 ELE10/100VSMS CAPACITOR ELECTROLYTIC SM
C 726 CER104PF50V CAPACITOR CERAMIC DISK 50
C 727 ELE10/100VSMS CAPACITOR ELECTROLYTIC SM
C 728 ELE10/100VSMS CAPACITOR ELECTROLYTIC SM
C 731 ELE100/16VSMS CAPACITOR ELECTROLYTIC SM
C 740 MAL102J CAPACITOR STICON
C 741 ELE47/25VSMS CAPACITOR ELECTROLYTIC SM
C 750 ELE2200/25VRX CAPACITOR ELECTROLYTIC R
C 751 ELE2200/25VRX CAPACITOR ELECTROLYTIC R
C 752 CER104PF50V CAPACITOR CERAMIC DISK 50
C 753 ELE1000/35VRX CAPACITOR ELECTROLYTIC R
C 760 MAL222J63VTL CAPACITOR MYLAR 5% 63V T
C 761 ELE2.2/50VSMS CAPACITOR ELECTROLYTIC SM
C 762 ELE4.7/50VSMS CAPACITOR ELECTROLYTIC SM
C 763 ELE47/25VSMS CAPACITOR ELECTROLYTIC SM
C 765 CER104PF50V CAPACITOR CERAMIC DISK 50
C 766 CER104PF50V CAPACITOR CERAMIC DISK 50
C 767 ELE1000/50VSD CAPACITOR ELECTROLYTIC S
C 768 ELE1000/50VSD CAPACITOR ELECTROLYTIC S
C 769 ELE2200/50VSHL CAPACITOR ELECTROLYTIC S
C 770 ELE2200/50VSHL CAPACITOR ELECTROLYTIC S
C 771 ELE2200/50VSHL CAPACITOR ELECTROLYTIC S
C 772 ELE2200/50VSHL CAPACITOR ELECTROLYTIC S
C 773 MAL105J63VTL CAPACITOR MYLAR 5% 63V T
C 774 MAL105J63VTL CAPACITOR MYLAR 5% 63V T
C 780 CER22PF50VNPO CAPACITOR CERAMIC DISK 50
C 781 ELE10/50VMS CAPACITOR ELECTROLYTIC SM
C 785 ELE100/35VSMS CAPACITOR ELECTROLYTIC SM
C 786 ELE100/35VSMS CAPACITOR ELECTROLYTIC SM
C 787 CER104PF50V CAPACITOR CERAMIC DISK 50
C 788 CER104PF50V CAPACITOR CERAMIC DISK 50
C 790 CER473PF50V CAPACITOR CERAMIC DISK 50
C 791 MAL105J63VTL CAPACITOR MYLAR 5% 63V T
C 792 CER473PF50V CAPACITOR CERAMIC DISK 50
C 850 ELE10/25VSMS CAPACITOR ELECTROLYTIC SM
C 861 CER223PF50V CAPACITOR CERAMIC DISK 50
C 862 CER104PF50V CAPACITOR CERAMIC DISK 50
C 863 MAL103J63VTL CAPACITOR MYLAR 5% 63V T
C 864 MAL103J63VTL CAPACITOR MYLAR 5% 63V T
C 867 CER104PF50V CAPACITOR CERAMIC DISK 50
CON01 LWL0640-2P WAFER
D 142 1N4148 GE DIODE SWITCHING SIGNA
D 143 1N4148 GE DIODE SWITCHING SIGNA
D 151 1N5235 DIODE ZENER 6.8V
D 170 1N4148 GE DIODE SWITCHING SIGNA
D 242 1N4148 GE DIODE SWITCHING SIGNA
D 243 1N4148 GE DIODE SWITCHING SIGNA
D 251 1N5235 DIODE ZENER 6.8V
D 701 1N5404 CARBON RESISTOR RECTIFIER
D 702 1N4004 DIODE RECTIFIER
D 704 1N4148 GE DIODE SWITCHING SIGNA
D 710 1N4148 GE DIODE SWITCHING SIGNA
D 711 1N4148 GE DIODE SWITCHING SIGNA
D 722 PR1504 DIODE FAST RECOVERY
D 723 PR1504 DIODE FAST RECOVERY
D 731 PR1504 DIODE FAST RECOVERY
D 732 PR1504 DIODE FAST RECOVERY
D 734 PR1504 DIODE FAST RECOVERY
D 735 PR1504 DIODE FAST RECOVERY
D 751 ESC25M02-D DIODE FAST RECOVERY
D 752 ESC25M02-D DIODE FAST RECOVERY
D 770 1N4148 GE DIODE SWITCHING SIGNA
D 771 1N4148 GE DIODE SWITCHING SIGNA
D 850 1N4148 GE DIODE SWITCHING SIGNA
F 1 FUSE25A/32V FUSE
A
TEFLON TUBE
F 2 FUSE25A/32V FUSE
A
TEFLON TUBE
Electrical parts list ( MAIN PCB )
Block No. 01
A
Item Parts number Parts name Area Remarks
A
Eiectrical parts list