Jvc KS-T807 Service Manual
SERVICE MANUAL
CASSETTE RECEIVER
MA06920042
KS-T807,KS-T707
Area suffix
EE --------- Russian Federation
KS-T807
KS-T707
KS-T807EE KS-T707EE
CHANGING the STANDARD PLATE
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24
COPYRIGHT © 2004 VICTOR COMPANY OF JAPAN, LIMITED
No.MA069
2004/2
SPECIFICATION
AUDIO AMPLIFIER SECTION
Maximum Power Output Front 45 W per channel
Rear 45 W per channel
Continuous Power Output (RMS) Front 17 W per channel into 4 Ω, 40 Hz to 20 000 Hz at no more
than 0.8% total harmonic distortion.
Rear 17 W per channel into 4 Ω, 40 Hz to 20 000 Hz at no more
than 0.8% total harmonic distortion.
Load Impedance 4 Ω (4 Ω to 8 Ω allowance)
Tone Control Range Bass ±10 dB at 100 Hz
Treble ±10 dB at 10 kHz
Frequency Response 40 Hz to 20 000 Hz
Signal-to-Noise Ratio 70 dB
Line-Out Level/Impedance 2.0 V/20 kΩ load (250 nWb/m)
TUNER SECTION
Frequency Range FM1/FM2 87.5 MHz to 108.0 MHz
FM3 65.00 MHz to 74.00 MHz
AM (MW) 522 kHz to 1 620 kHz
(LW) 144 kHz to 279 kHz
[FM Tuner] Usable Sensitivity 11.3 dBf (1.0 µV/75 Ω)
50 dB Quieting Sensitivity 16.3 dBf (1.8 µV/75 Ω)
Alternate Channel Selectivity (400 kHz) 65 dB
Frequency Response 40 Hz to 15 000 Hz
Stereo Separation 30 dB
Capture Ratio 1.5 dB
[MW Tuner] Sensitivity 20 µV
Selectivity 35 dB
[LW Tuner] Sensitivity 50 µV
CASSETTE DECK SECTION
Wow & Flutter 0.11% (WRMS)
Fast-Wind Time 100 sec. (C-60)
Frequency Response 30 Hz to 16 000 Hz (Normal tape)
Signal-to-Noise Ratio 56 dB
Stereo Separation 40 dB
GENERAL
Power Requirement Operating Voltage DC 14.4 V (11 V to 16 V allowance)
Grounding System Negative ground
Allowable Operating Temperature 0ºC to +40ºC
Dimensions (W × H × D) Installation Size (approx.) 182 mm × 52 mm × 150 mm
Panel Size (approx.) 188 mm × 58 mm × 12 mm
Mass (approx.) 1.5 kg (excluding accessories)
Design and specifications are subject to change without notice.
1-2 (No.MA069)
1.1 Safety Precautions
SECTION 1
PRECAUTION
!
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.
(No.MA069)1-3
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.
1-4 (No.MA069)
SECTION 3
DISASSEMBLY
3.1 Main body section
3.1.1 Removing the front panel assembly
(See Fig.1)
(1) Push the detach button in the lower right part of the front
panel assembly and remove the front panel assembly.
3.1.2 Removing the bottom cover
(See Fig.2)
(1) Turn the main body up side down.
(2) Insert a screwdriver under the joints to release the two
joints a on the left side, two joints b on the right side and
joint c on the back side of the main body, then remove the
bottom cover from the main body.
Note:
When releasing the joints using a screwdriver, do not damage
the main board.
Front panel assembly
Detach button
Fig.1
Bottom cover
Joint b
Joint a
3.1.3 Removing the front chassis assembly
(See Fig.3 and 4)
• Prior to performing the following procedures, remove the front
panel assembly and bottom cover.
(1) Remove the two screws A on the both sides of the main
body. (See fig.3.)
(2) Remove the two screws B on the front side of the main
body. (See fig.4)
(3) Release the two joints d and two joints e on the both sides
of the main body, then remove the front chassis assembly
toward the front. (See fig.3.)
Joint a
Joint d
Joint d
Joint c
Fig.2
A
Front chassis assembly
Fig.3
Front chassis assembly
B
Fig.4
Joint b
Joint e
A
Joint e
(No.MA069)1-5
3.1.4 Removing the side panel
(See Fig.5)
• Prior to performing the following procedure, remove the front
panel assembly as required.
(1) Remove the two screws C and screw D attaching the side
panel on the left side of the main body, and remove the side
panel.
3.1.5 Removing the rear bracket
(See Fig.6)
• Prior to performing the following procedure, remove the bottom
cover.
(1) Remove the two screws E, screw F and three screws G at-
taching the rear bracket on the back side of the main body.
(2) Remove the rear bracket.
3.1.6 Removing the main board
(See Figs.6 and 7)
• Prior to performing the following procedures, remove the front
panel assembly, bottom cover and side panel.
• Remove the front chassis assembly as required.
(1) Remove the two screws E attaching the rear bracket on the
back side of the main body. (See Fig.6.)
(2) Remove the two screws H attaching the main board. (See
Fig.7.)
(3) Disconnect the connector CP401
the main body and take out the main board with the rear
bracket. (See Fig.7.)
Reference:
Remove the rear bracket from the main body as required. (See
“3.1.5 Removing the rear bracket”.)
on the main board from
H
CCD
E
Side panel
Rear bracket
Fig.5
G
Fig.6
Main board
G
F
G
E
H
1-6 (No.MA069)
CP401
Fig.7
3.1.7 Removing the cassette mechanism assembly
(See Fig. 8)
• Prior to performing the following procedure, remove the front
panel assembly, bottom cover, side panel, rear bracket and
main board.
• Remove the front chassis assembly as required.
(1) Remove the four screws J attaching the cassette mecha-
nism assembly on the top chassis.
(2) Take out the cassette mechanism assembly.
Cassette mechanism assembly
J
J
3.1.8 Removing the mecha control board
(See Fig.9)
• Prior to performing the following procedure, remove the front
panel assembly, bottom cover, side panel, rear bracket, main
board and cassette mechanism assembly.
(1) Disconnect the wire from the connector CN402
mecha control board.
(2) Disconnect the card wire from the connector CN403 on the
mecha control board.
(3) Remove the screw K attaching the mecha control board.
(4) Bend the hook f in direction of the arrow 1 and move the
mecha control board in the direction of the arrow 2.
(5) Remove the mecha control board from the mecha bracket
(L) of the top chassis.
on the
K
J J
CN402
CN401
Top chassis
Fig.8
Mecha control board
CN403
Fig.9
Hook f
1
2
Mecha bracket (L)
(No.MA069)1-7
3.1.9 Removing the front board
(See Figs.10 to 12)
• Prior to performing the following procedures, remove the front
panel assembly.
(1) Remove the four screws L on the back side of the front
panel assembly. (See Fig.10.)
(2) Release the ten joints g and remove the rear cover. (See
Fig.11.)
(3) Take out the front board from the front panel assembly.
(See Fig.12.)
Caution:
Take care not to lose the springs.
Joints g
L
Rear cover
Fig.10
Joints g
Joints g
Spring
Front panel assembly
Rear cover
Joints g
Fig.11
Front board
Spring
Fig.12
1-8 (No.MA069)
3.2 Cassette mechanism assembly
r
REFERENCE:
Prior to performing the following procedures, turn the mode
gear on the bottom of the body until the respective part comes
to the EJECT position (Refer to Fig.1).
3.2.1 Removing the cassette guide
(See Fig.2)
(1) Turn the mode gear to set to RVS play or subsequent
mode.
(2) Remove the cassette guide from the main chassis while re-
leasing each two joint tabs a in the direction of the arrow.
Mode gea
Fig.1
Cassette guide
3.2.2 Removing the load arm
(See Fig.3)
(1) Remove the E-washer attaching the load arm.
(2) Move the load arm in the direction of the arrow and release
the joint b on the cassette catch.
Load arm
E-washer
Tab a
Tab a
Fig.2
Joint b
Fig.3
(No.MA069)1-9
3.2.3 Removing the cassette hanger assembly / cassette holder
r
(See Fig.4 to 7)
(1) Check the mode is set to EJECT. Push down the front part
of the cassette holder and move in the direction of the arrow to release the joint c.
(2) Move the rear part of the cassette hanger assembly in the
direction of the arrow to release it from the two joint bosses
d.
(3) Release the holder stabilizer spring from the hooks e and
f, then pull out from the cassette hanger assembly.
(4) Bring up the rear side of the cassette hanger assembly to
release the joint g and h.
(5) Pull out the cassette catch from the cassette hanger as-
sembly.
Cassette holder assembly
Side bracket
Joints c
Cassette holder assembly
Fig.4
Boss d
Cassette hanger
assembly
Boss d
Cassette stabilizer spring
Hook e
Cassette holder
assembly
Hook g
Cassette hange
assembly
Hook f
Fig.5
Cassette hanger
assembly
Hook h
Fig.6
Cassette hanger assembly
1-10 (No.MA069)
Cassette catch
Cassette holder assembly
Fig.7
3.2.4 Removing the side bracket assembly
(See Fig.8 to 10)
(1) Remove the screw A attaching the side bracket assembly.
(2) Detach the front side of the side bracket assembly upward
and pull out forward to release the joint i and j in the rear.
CAUTION:
When reassembling, make sure that the boss k of the
main chassis is set in the notch of the load rack under the
side bracket assembly. Do not reattach the load rack on
the boss k.
CAUTION:
After reattaching the side bracket assembly, confirm operation.
Side bracket assembly
Joint i
Joint j
A
Side bracket assembly
Fig.8
Side bracket assembly
Joint i
Joint j
Load rack
Load rack
Boss k
Fig.9
Boss k
Fig.10
(No.MA069)1-11
3.2.5 Removing the pinch arm (F) assembly
r
(See Fig.11 and 12)
(1) Remove the polywasher and pull out the pinch arm (F) as-
sembly.
(2) Remove the compulsion spring.
3.2.6 Removing the pinch arm (R) assembly
(See Fig.11 and 12)
(1) Remove the polywasher and pull out the pinch arm (R) as-
sembly.
3.2.7 Removing the slide chassis assembly
(See Fig.13 and 14)
REFERENCE:
It is not necessary to remove the head and the tape guide.
(1) Move the slide chassis assembly in the direction of the ar-
row to release the two joints l and remove from the main
chassis.
(2) Remove the rack link.
CAUTION:
When reassembling, first reattach the rack link, and next
fit the boss m and hook n of the slide chassis assembly
to the hole of the main chassis, and engage the two joints
l.
Joint l
Joint l
Slide chassis assembly
Fig.13
Head
Tape guide
Boss m
Rack link
Hook n
Polywasher
Polywasher
Compulsion
spring
Pinch arm
(R) assembly
Pinch arm
(F) assembly
Fig.11
Pinch arm (F) assembly
Pinch arm
(R) assembly
Polywashe
Fig.14
Polywasher
1-12 (No.MA069)
Fig.12
3.2.8 Removing the head / tape guide
(See Fig.16 and 17)
REFERENCE:
It is not necessary to remove the slide chassis assembly.
(1) Remove the band attaching the wire to the head.
(2) Remove the two screws B, the head and the head support
spring.
(3) Remove the pinch arm spring from the tape guide.
(4) Remove the tape guide and the pinch spring arm.
CAUTION:
When reattaching the pinch arm spring, set both end of
it to the pinch spring arm (remarked o).
CAUTION:
When reattaching the head, set the wires into the groove
of the tape guide (Fig.16).
3.2.9 Removing the flywheel assembly (F) & (R)
(See Fig.18 and 19)
REFERENCE:
It is not necessary to remove the slide chassis assembly.
(1) Remove the belt at the bottom.
(2) Remove the two polywashers on the upper side.
(3) Pull out each flywheel assembly downward.
B
Slide chassis assembly
Flywheel assembly (F)
Flywheel assembly (R)
Belt
Fig.17
Polywasher
Polywasher
Head
Head support spring
Tape guide
o
Pinch spring arm
Head
Fig.15
Tape guide
B
Pinch arm spring
Flywheel assembly (F)
Flywheel assembly (R)
Fig.18
o
Slid chassis assembly
Fig.16
(No.MA069)1-13
3.2.10 Disassembling the flywheel assembly (F)
r
(See Fig.19 and 20)
(1) Push and turn counterclockwise the spring holder (F) to re-
lease the three joints p on the bottom of the flywheel.
(2) The spring holder (F), the TU spring and the friction gear
play come off.
(3) Remove the polywasher and felt.
3.2.11 Disassembling the flywheel assembly (R)
(See Fig.19 and 20)
(1) Push and turn clockwise the spring holder (R) to release
the three joints q on the bottom of the flywheel.
(2) The spring holder (R), the FF spring and the friction gear
FF come off.
(3) Remove the polywasher and the felt.
3.2.12 Removing the reel board
(See Fig.21 and 22)
(1) Remove the two screws C attaching the reel board.
(2) Move the reel board in the direction of the arrow to release
the joint r.
(3) Unsolder the wires if necessary.
CAUTION:
When reattaching, confirm operation of the MODE
switch and the ST-BY switch.The mode position between EJECT and ST-BY is optimum for reattaching.Connect the card wire extending from the reel board
to the FFC pad before reattaching the reel board.
FFC pad
C
Joint
Reel board
C
Fig.21
FFC pad
CT-1 switch
MODE switch
Flywheel
assembly (F)
Joint p
Joints p
Fig.19
Polywasher
Spring holder (R)
Spring holder (F)
TU spring
Friction gear FF
Friction gear play
Polywasher
FF spring
Flywheel
assembly (R)
Joints q
Joint q
Soldering
ST-BY switch
Fig.22
Flywheel assembly (F)
1-14 (No.MA069)
Felt
Felt
Flywheel assembly (R)
Fig.20
3.2.13 Removing the gear base arm / gear base link assembly
(See Fig.23 to 25)
(1) Move the gear base arm in the direction of the arrow.
(2) Insert a slotted screwdriver to the gear base spring under
the gear base arm, and release the gear base arm upward
from the boss on the gear base assembly.
(3) Remove the gear base arm from the main chassis while re-
leasing the two joints s.
(4) Move the gear base link assemby in the direction of the ar-
row to release the two joints t.
REFERENCE:
When reattaching the gear base arm, make sure that the
boss on the gear base assembly is inside the gear base
spring.
3.2.14 Removing the FFC pad
(See Fig.25 and 27)
(1) Push each joint hook u of the FFC pad and remove toward
the bottom.
Gear base
link assembly
Gear base spring
Joint t
Joint t
Gear base arm
Joints s
Hook u
FFC pad
Hook u
Fig.23
Gear base arm
Gear base link
assembly
Screwdriver
Fig.24
Gear base arm
FFC pad
Fig.25
(No.MA069)1-15
3.2.15 Removing the mode gear
r
r
(See Fig.26 and 29)
(1) Remove the polywasher on the bottom and pull out the
mode gear.
3.2.16 Removing the mode switch actuator
(See Fig.26, 27 and 29)
(1) Pull out the mode switch actuator at the bottom.
REFERENCE:
When reattaching the mode switch actuator to the main
chassis, make sure to set on the shaft and insert v into
the slot w.
3.2.17 Removing the direction link / direction plate
(See Fig.27 to 29)
(1) Remove the polywasher attaching the direction link.
(2) Bring up the direction link to release the three joints x, y
and z at a time.
(3) Move the direction plate in the direction of the arrow to re-
lease the two joints a’.
REFERENCE:
When reattaching the direction plate, engage the two
joints a’ and move in the direction of the arrow (Refer to
Fig.28).
REFERENCE:
When reattaching the direction link, move the direction
plate in the direction of the arrow and engage the three
joint x, y and z at a time (Refer to Fig.29).
3.2.18 Removing the mode rack assembly
(See Fig.27 and 28)
(1) Move the mode rack assembly in the direction of the arrow
to release the two joints b’ and the joint c’.
REFERENCE:
When reattaching, set the two b’ on the bottom of the
mode rack assembly into the slots of the main chassis
and move in the direction of the arrow (See Fig.28).
Direction plate
Direction plate
Joints a'
Joint z
Direction link
Direction plate
Mode switch actuator
Direction link
Fig.26
Slot w
Joint y
Polywasher
Fig.27
Mode rack assembly
Joint b'
Mode gear
Polywashe
Mode rack assembly
Joint x
Joint b'
Joint c'
1-16 (No.MA069)
Joints a'
Fig.28
Direction link
Mode switch actuator
Polywasher
v
Mode gea
Direction plate
Mode rack assembly
Fig.29
3.2.19 Removing the gear base assembly / take up gear / reflector gear
r
(See Fig.30 to 32)
(1) Push in the pin d’ of the gear base assembly on the upper
side of the body and move the reflector gear toward the
bottom, then pull out.
(2) Remove the polywasher on the bottom and pull out the
take up gear.
(3) Move the gear base assembly in the direction of the arrow
to release it from the two slots e’ of the main chassis.
REFERENCE:
The parts are damaged when removed. Please replace
with new ones.
3.2.20 Removing the reel driver / reel spindle
(See Fig.32)
(1) Draw out the reel driver from the shaft on the main chassis
and remove the reel driver spring and the reel spindle respectively.
CAUTION:
The reel driver is damaged when removed. Please replace with a new one.
Gear base assembly
Pin d'
Polywasher
Slot e'
Slot e'
Fig.30
Take up gear
Reflector gear
Reel driver
Reel driver spring
Reel spindle
Main chassis
Reflector gear
Fig.31
Reel driver
Reel driver spring
Reel spindle
Gear base assembly
Slots e’
Take up gea
Polywasher
Fig.32
(No.MA069)1-17
3.2.21 Removing the side bracket assembly
(See Fig.33 to 37)
(1) Remove the eject cam plate spring.
(2) Push the joint f’ through the slot to remove the load rack
downward.
(3) Move the eject cam limiter in the direction of the arrow to
release it from the boss g’ of the side bracket assembly and
from the two joints h’.
(4) Move the eject cam plate in the direction of the arrow to re-
lease the joint i’.
CAUTION:
When reassembling, confirm operation of each part before reattaching the eject cam plate spring.
Joint f'
Side bracket assembly
Boss g'
Eject cam plate
Fig.36
Side bracket assembly
Joint i'
Eject cam plate spring
Side bracket assembly
Joint h'
Side bracket
assembly
Boss g'
Boss g'
Load rack
Fig.33
Eject cam limiter
Joint f'
Fig.34
Eject cam limiter
Eject cam plate
Joint i'
Fig.37
Joint h'
Load rack
Joint h'
1-18 (No.MA069)
Eject cam plate
Fig.35
Joint h'
3.2.22 Removing the main motor assembly / sub motor assembly
r
r
r
(See Fig.38 to 40)
(1) Remove the belt at the bottom.
(2) Remove the polywasher and pull out the mode gear.
(3) Pull out the reduction gear (B).
(4) Remove the polywasher and pull out the reduction gear
(A).
(5) Remove the two screws attaching the main motor assem-
bly.
(6) Remove the two screws E attaching the sub motor assem-
bly.
(7) Unsolder the wires on the reel board if necessary.
CAUTION:
When reassembling, adjust the length of the wires extending from the sub motor asswmbly by attaching them
to the side of the sub motor assembly with the wires extending from the main motor assembly using a spacer.
Belt
Reduction gear (B)
Reduction gear (B)
E
Mode gear
Polywasher
Fig.38
Main motor
D
assembly
Reduction
gear (A)
Polywashe
Sub moto
assembly
E
Polywasher
Reduction gear (A)
D
Spacer
Main motor assembly
Sub motor assembly
Fig.39
Main motor assembly
Sub motor assembly
Fig.40
Space
(No.MA069)1-19
SECTION 4
ADJUSTMENT
4.1 Adjustment method
Test instruments required for adjustment
(1) Digital oscilloscope (100MHz)
(2) Frequency counter meter
(3) Electric voltmeter
(4) Wow & flutter meter
(5) Test tapes
• VT724...........................For DOLBY level measurement
• VT739..............For playback frequency measurement
• VT712....For wow flutter & tape speed measurement
• VT703........................For head azimuth measurement
(6) Torque gauge............................Cassette type for CTG-N
Measuring conditions (Amplifier section)
• Power supply voltage.............. DC14.4V (11V to 16V allowance)
• Load impedance............ 4Ω (4Ω to 8Ω allowance)
• Line out level/Impedance..............1.0V/20k load (250 nWb/m)
Standard volume position
Balance and Bass, Treble volume, Fader : Center (Indication "0")
Loudness, Dolby NR, Sound, Cruise : Off
Volume position is about 2V at speaker output with following
conditions, Playback the test tape VT721.
AM mode 999kHz/62dB, INT/400Hz, 30%
modulation signal on receiving.
FM mono mode 97.9MHz/66dB, INT/400Hz, 22.5kHz
deviation pilot off mono
FM stereo mode 1kHz, 67.5kHz dev. pilot 7.5kHz dev.
Output level 0dB (1µV,50Ω/open terminal)
1-20 (No.MA069)
Information for using a car audio service jig
(1) We're advancing efforts to make our extension cords common for all car audio products.
Please use this type of extension cord as follows.
(2) As a U-shape type top cover is employed, this type of extension cord is needed to check operation of the mechanism assembly
after disassembly.
(3) Extension cord : EXTKSRT002-18P ( 18 pin extension cord ) For connection between mechanism assemblyand main board.
(4) Check for mechanism driving section such as motor ,etc.
Disassembly method
(1) Remove the front panel assembly.
(2) Remove the bottom cover.
(3) Remove the front chassis.
(4) Remove the rear panel
(5) Remove the heat sink.
(6) Remove the main board.
(7) Reattach the heat sink with the two screws B. (Refer to DISASSEMBLY.)
(8) Install the front chassis and front panel assembly.
(9) Confirm that current is being carried by connecting an extension cord jig.
NOTE:
Available to connect to the CJ601
CAUTION :
Be sure to attach the heat sink and rear panel on the power amplifier IC and regulator IC of a main board when supplying
the power.If voltage is applied without attaching those parts, the power amplifier IC and regulator IC will be destroyed
by heat.
connector when installing the front panel.
To
Cassette mechanism
EXTKSRT002-18P
Extension cord
EXTKSRT002-18P
To
Main board
Front panel assembly
Cassette mechanism
Main board
(No.MA069)1-21
Arrangement of adjusting & test points
A
Cassette mechanism
(Surface)
Motor assembly
Tape speed adjust
Azimuth screw
(Forward)
Playback head
Azimuth screw B
(Reverse)
Head section view
Azimuth screw B
(Reverse)
Playback head
Azimuth screw A
(Forward)
1-22 (No.MA069)
Item Conditions Adjustment and Confirmation methods S.Values Adjust
1. Head azimuth adjustment
Test tape:
SCC-1659
VT703 (10kHz)
Head height adjustment
Adjust the azimuth directly. When you adjust the height
using a mirror tape, remove the cassette housing from
the mechanism chassis. After installing the cassette
housing, perform the azimuth adjustment.
(1) Load the SCC-1659 mirror tape. Adjust with height
adjustment screw A and azimuth adjustment screw
B so that line A of the mirror tape runs in the center
between Lch and Rch in the reverse play mode.
(2) After switching from REV to FWD then to REV,
check that the head position set in procedure 1 is not
changed. (If the position has shifted, adjust again
and check.)
(3) Adjust with azimuth adjustment screw B so that line
B of the mirror tape runs in the center between Lch
and Rch in the forward play mode.
Head shield
The head is at low position
during.
Head shield
The head is at High position
during REV.
A line
B line
2. Tape speed
and wow flutter confirmation
3. Play back
frequency response confirmation
Test tape:
VT724 (1kHz)
VT703 (10kHz)
VT721 (315Hz)
Test tape:
VT712 (3kHz)
Test tape:
VT724 (1kHz)
VT739 (63Hz /
1kHz / 10kHz)
Head azimuth adjustment
(1) Load VT724 (1kHz) and play it back in the reverse
play mode. Set the Rch output level to max.
(2) Load VT703 (10kHz) and play it back in the forward
play mode. Adjust the Rch and Lch output levels to
max, with azimuth adjustment screw B. In this case,
the phase difference should be within 45 .
(3) Engage the reverse mode and adjust the output lev-
el to max, with azimuth adjustment screw C.(The
phase difference should be 45 or more.)
(4) When switching between forward and reverse
modes, the difference between channels should be
within 3dB. (Between FWD L and R, REV L and R.)
(5) When VT721 (315Hz) is played back, the level differ-
ence between channels should be within 1.5dB.
(1) Check to see if the reading of the F, counter / wow
flutter meter is within 3015Hz to 3045Hz (FWD/
REV), and less than 0.35% (JIS RMS).
(2) In case of out of specification, adjust the motor with
a built-in volume resistor.
(1) Play test tape VT724, and set the volume position at
2V.
(2) Play test tape VT739 and confirm.1kHz / 10kHz: -1
±3dB,1kHz / 63Hz: 0 ±3dB,
(3) When 10kHz is out of specification, it will be neces-
sary to read adjust the azimuth.
Output
level:
Maximum
PBHead
FWD Adj B
REV Adj C
(0 ) (45 )
Tape speed:
3015Hz to 3045Hz
Wow flutter:
less than 0.35%
Speaker out
1kHz / 63Hz: 0 ±3dB
1kHz / 10kHz: -1 ±3dB
HEIGHT Adj A
phase
Built-in volume
resistor
The tuner section is of an adjustment-freedesign. In case the tuner is in trouble, replace the tuner pack.
(No.MA069)1-23
5.1 16 PIN CORD DIAGRAM
SECTION 5
TROUBLESHOOTING
10
12
14
16
BR
YL
NC
BK
NC
NC
11
13
BL/WH
15
RD
1
2
3
4
5
6
7
8
10
9
VI
VI/BK
GY
GY/BK
WH
WH/BK
GN
GN/BK
BR
VI/BK
2
GY/BK
4
WH/BK
6
8
GN/BK
RR+
RR-
FR+
FR-
FL+
FL-
RL+
RL-
TEL
VI
GY
WH
GN
1
BK
RD
Black
Red
3
BL
5
7
WH White
BR
Blue
Brown
GN
VI
GY
YL
Green
Violet
Gray
Yellow
RR
FR
FL
RL
REMOTE
YL
12
BL/WH
13
RD
15
16
BK
Rear Right
Front Right
Front Left
Rear Left
Remote out
MEMORY
REMOTE
ACC
GND
ANT
ACC
TEL
GND
MEMORY
MEMORY BACKUP
DIRECT TO BATTERY
+12Volt
ACC + 12Volt
GROUND
Auto Antenna
ACC Line
Telephone Muting
Ground
Memory Backup Battery+
1-24 (No.MA069)
(No.MA069)1-25
VICTOR COMPANY OF JAPAN, LIMITED
AV & MULTIMEDIA COMPANY MOBILE ENTERTAINMENT CATEGORY 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan
(No.MA069)
Printed in Japan
WPC
SCHEMATIC DIAGRAMS
CASSETTE RECEIVER
KS-T807,KS-T707
CD-ROM No.SML200402
Area suffix
EE --------- Russian Federation
KS-T807
Contents
Block diagram
Standard schematic diagrams
Printed circuit boards
KS-T707
KS-T807EE KS-T707EE
CHANGING the STANDARD PLATE
2-1
2-2 to 7
2-8, 9
COPYRIGHT 2004 VICTOR COMPANY OF JAPAN, LTD.
No.MA069SCH
2004/2
Safety precaution
!
!
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.
Please use enough caution not to see the beam directly or touch it in case of an
adjustment or operation check.
Block diagram
HEAD
CN402
FWD-L
FWD-R
REW-L
REW-R
IC401
PB EQ
SUBMO+
SUBMO-
IC402
DC MOTOR
DRIVER
F/R
MSOUT
LCH
RCH
FF/REW
SUBMO+
SUBMO-
CN403
MOTOR
TAPEIN
MODE
STANDBY
REEL
SUB
MOTOR
MAIN
MOTOR
SWITCH
TAPE END.
STANDBY
CN401
CP401
SUBMO+
SUBMOMOTOR
TAPEIN
STANDBY
MODE
REEL
F/R
MSOUT
FF/REW
IC702
RESET
RESET
J1
ANT
PLLCE
PLLDA
PLLCL
PLLDI
IC31
PLL
FM/AM OSC
FM VT
AM VT
IC701
CPU
TU1
FM/AM
TUNER
L-CH
R-CH
SD/ST
MONO
SM,IFC-CONT
FM/AM
SEEK/STOP
RDSCL
RDSDA
SCL
SDA
IC161
E.VOLUME
VOLDA
VOLCL
IC71
RDS
DETECTOR
IC771
EPROM
OUTLF
OUTLR
OUTRF
OUTRR
TAPE.L
TAPE.R
IC901
REGULATOR
FRONT R, FRVONT L
REAR L, REAR R
IC301
POWER
AMP.
FRONT LEFT (+)
FRONT LEFT (-)
FRONT RIGHT (+)
FRONT RIGHT (-)
REAR LEFT (+)
REAR LEFT (-)
REAR RIGHT (+)
REAR RIGHT (-)
J321
LINE OUT
LCD1
COM1
COM2
COM3
S1 to S50
IC602
REMOCON
REMOCON
IC601
LCD
DRIVER
LCDCL
LCDDA
LCDCE
S601 to S617
KEY MATRIX
KEY0
KEY1
KEY2
JS686
ENCODER
ENC1
ENC2
CN601
CN701
KEY0
KEY1
KEY2
LCDCL
LCDDA
LCDCE
REMOCON
ENC1
ENC2
TAPE.L
TAPE.R
SI,SO,I/O
INT,SCK
SI
IC801
JVC BUS
CH.L
CH.R
CH.SCK
EACH BLOCK
J801
CN901
SPK
BATTERY
CD CHANGER
CONTROL
2-1
Standard schematic diagrams
Main amplifier section
TU1
QAU0314-001
L1
QAX0616-001Z
IC31
TB2118F-X
C33
47/6.3
47/6.3
C76
C75
47p
UDZS6.2B-X
UDZS6.2B-X
D707
D706
C37
10p
C77
0.01
C74
82p
UDZS6.2B-X
D708
47k
R802
4.7u
1SS355-X
D1
C40
10/16
C48
0.047
10
R42
R71
X71
QAX0263-001Z
UDZS6.2B-X
C716
D709
R805
100k
R804
22k
R803
100
C32
47p
1000p
C46
C47
R43
470
2.2k
0.1
R38
C38
0.01
0.047
C42
C41
0.01
Q31
UN2211-X
R72
2.2k
C717
0.1
1SS355-X
D2
100
R39
39k
R40
C43
0.047
0.01
R44
220
C50
100p
IC71
SAA6579T-X
REMOCON
ENC1
ENC2
LCDCE
LCDDA
LCDCL
KEY2
KEY1
KEY0
HD74HC126FP-X
220/10
C8
0
R41
C44
R806
0.033
IC801
0.01
C6
C39
0.001
3.9k
C49
0.01
C7
6800p
C45
0.001
100/10
C31
220/10
C1
FM/AM
SD/ST
SQ
10k
C2
0.047
R9
68
2SB624/4/-X
R7
4.7K
10
R31
C71
560p
C72
0.022
C73
2.2/50
220/10
C4
C10
22p
Q6
Q7
UN2211-X
R58
470
C55
0.47/50
C78
SI
R810
C801
0.22
0.01
C3
R6
47k
R57
15k
R56
10k
Q52
2SC2412K/R/-X
0.01
R765
R808
330
100
To CN401
(SHEET 3)
To CN601
(SHEET 2)
CP401
QGB1214J1-18S
CN701
QNZ0605-001
R37
R36
PLLCE
PLLDA
R35
PLLCL
R34
PLLDI
R718
J801
QNZ0095-001
C35
10p
2.2k
2.2k
2.2k
2.2k
R33
68k
UDZS6.2B-X
D701
C36
7p
10k
UDZS6.2B-X
D702
J1
QNB0100-002
C34
0.047
Q701
2SC2412K/R/-X
STANDBY
TAPEIN
MODE
SUBMO+
SUBMO-
REEL
MSIN
DOLBY
F/R
FF/REW
MOTOR
UDZS6.2B-X
D703
CH.R
CH.L
B802
B801
X31
R32
6.2K
UDZS6.2B-X
UDZS6.2B-X
D704
D705
220
220
TAPE.L
TAPE.R
SO
R809
22k
R801
47k
100
R74
2.2k
R73
510
2SB709A/R/-X
D4
1SS355-X
C54
0.1
C53
0.0047
D718
SLR-56MC3F
SI
SO
I/O
R807
100k
INT
SCK
SCK
0.012
0.001
0.012
C84
C95
C94
Q5
R4
3.3k
R54
R53
10k
47k
C52
0.01
2.2k
R55
Q51
2SC2412K/R/-X
0.001
C85
R5
47k
D5
1SS355-X
R52
47k
A.GND
Q1
UN2211-X
22k
C51
330P
R51
RDSDA
RDSCL
R760
R759
MOTOR
FF/REW
F/R
DOLBY
MSIN
REEL
SUBMO-
SUBMO+
MODE
CN702
QGA2006F1-02
SM
MUTE
C706
0.047
VOLDA
VOLCL
R762
R761
47k
R713
R1
47k
R712
C9
12
MONO
47k
R711
C718
R716
R715
R714
47k
R710
1/50
4.7/25
R717
47k
47k
47k
47k
47k
R709
D712
0.01
1/50
C81
C91
1/50
C5
R3
4.7k
Q3
UN2111-X
UN2111-X
1SS355-X
SEEK/STOP
AFCK
IC701
uPD784215AGC226
0
VDD
4.7K
4.7K
VPP
10K
47k
47k
56K
47k
R705
R706
R707
R708
D711
1SS355-X
B18
0
UDZS6.2B-X
Q2
2SD601A/R/-X
Q84
D84
R2
47k
47k
R704
R703
STEERING
9.1K
R81
9.1K
R91
Q91
2SD601A/R/-X
R93
4.7k
C83
0.1
R8
10k
Q8
UN2211-X
R758
47k
PCT
DIMIN
10k
1k
R721
R722
47k
TAPEIN
STANDBY
X1
GND
C705
0.047
C92
33K
33K
0.0022
R95
R92
Q9
UN2111-X
R94
0R0
Q53
UN2211-X
VSS
PLLDI
PLLCL
TELMUTE
10M
R755
R702
L702
1R0u
C714
0.047
QAX0617-001Z QAX0401-001
Q81
2SD601A/R/-X
R83
4.7k
47k
R59
PLLDA
PLLCE
R754
X701
0
C704
8p
FM/AM
820
C703
33K
R82
27p
33K
R85
AFCK
SEEK/STOP
0
10k
10k
R725
R723
R724
47k
R701
X702
27p
C702
C701
C82
0.0022
S702
QSW0451-001
2.2K
R719
STEERING
INT
47k
22p
R753
RDSCL
TU.R
TU.L
A.GND
MONO
10k
R726
R751
RDSDA
REMOCON
2-2
SD/ST
10k
R728
10k
CH.L
TU.L
TAPE.L
TAPE.R
TU.R
CH.R
R750
ENC1
47k
R767
RB160M-30-X
R249
D242
220
R167
22K
C172
0.0082
C169
0.0082
CPU.VDD
R165
C244
0.22
R168
2.2K
22K
2.2K
R166
C711
100/10
C713
0.01
C712
0.01
R247
47k
C173
0.18
C174
0.22
C171
0.18
C170
L701
4.7u
C245
0.22/50
2.2/50
C166
C165
TEA6320T-X
0R00R0
270
270
R771
R772
R732
R733
R734
R735
R736
R737
R738
R739
R740
D714
R741
R742
R743
R744
R745
R746
10k
R720
22K
R764
100
1SS355-X
D710
IC161
C709
R730
RD
C164
C163
C162
C161
C771
0.047
10k
0.01
1/50
1/50
1/50
1/50
2.2/50
IC771
BR24L16F-W-X
R731
47k
S701
QSW0451-001
10k
10k
2.2k
2.2k
2.2k
0
4.7k
4.7k
4.7k
UDZS5.6B-X
10k
10k
10k
10k
10k
S703
QSQ1A11-V06Z
D713
UDZS5.6B-X
IC702
IC-PST600M/G/-W
C710
47/6.3
LCDCE
LCDCL
LCDDA
I/O
SCK
SO
SI
KEY2
KEY1
KEY0
ENC2
R747
R748
R749
R766
C167
47/16
BUZZER
LEVEL
4.7k
4.7k
4.7k
47k
SM
SQ
C168
100/16
BUZZER
DIMIN
PCT
TELMUTE
R757
2.2k
R162
0R0
R164R163
R161
0R0
R729
47k
TD
10k
RESET
R756
47k
0.22
D241
C243
0.047
1SS355-X
R245
47
1k
R246
C176
C175
R891
47k
Q891
C242
22/16
2SD601A/R/-X
0.033
0.033
UN2211-X
R243
12k
R244
22k
Q241
R169 D161
220K 1SS355-X
R170
220K
0.0056
C178
C179
0.082
0.0056
C177
R892
1k
1SS355-X
D892
1SS355-X
D891
C891
0.1
R242
180k
C241
1/50
R241
47k
D162
1SS355-X
C180
R978
0R0
0R0
R979
R240
0
R171
100/16
R976
27k
R977
12k
IC901
HA13164A
10
C882
22/16
R881
47k
R248
D781
1SS355-X
C781
47/6.3
2200/6.3
C909
C181
C183
C184
C182
Q976
UN2211-X
Q977
2SA1037AK/RS/-X
Q881
UN2211-X
C881
0.1
4.7/25
4.7/25
D902
1SS355-X
C908
220/10
4.7/25
4.7/25
R999
R173
R172
MUTE
Q781
UN2111-X
R882
2SA1037AK/RS/-X
4.7k
9V
LEVEL
FL
RL
270
VOLDA
270
VOLCL
RR
FR
D782
1SS355-X
Q784
UN2111-X
BZ841
QAN0023-001Z
R841
2.2K
1SS355-X
D903
C907
Q904
Q903
UN2211-X
R781
10K
1/50
RR
RL
FR
FL
PCT
UN2211-X
D783
UDZS11B-X
Q841
UN2211-X
R909
47K
R908
2.2K
R782
47K
R783
1.8K
Q782
C782
100/16
C841
0.1/50
Q902
2SA1855/RST/-T
R907
47K
R906
1K
Q901
UN2211-X
R306
R308
47k
47k
0.1/50
C905
R910
R309
47k
R307
4.7K
100/16
C906
IC301
LA4743K
R301
C308
27K
0.22/50
R902
4.7k
R903
R302
27K
C309
0.22/50
C318
R311
0.22/50
27K
R312
27K
R305
1K
R352
R342
1K
R343
D343
1SS355-X
2.2k
R353
2.2k
D353
1SS355-X
D333
1SS355-X
R333
2.2k
D323
1SS355-X
2.2k
R332
1K
1K
R322
R901
47
C901
10/16
C902
0.047
RB160M-30-X
10K
R323
C313
C303
390p
C319
0.22/50
390p
1K
100
R331
B12
390p
C304
390p
C314
Q351
Q341
2SD1781K/QR/-X
Q331
2SD1781K/QR/-X
100
R321
C982
10/16
D982
QNN0489-001
0
0.47/25
C328
C301
4.7/25
2SD1781K/QR/-X
Q321
2SD1781K/QR/-X
100
R351
0.1
C981
D981
J321
100
R341
RB160M-30-X
C904
C903
L901
QQR0703-001
2.2k
2.2k
R982
CN901
QNZ0112-001
0.047
2200/16
D901
1N5401-F64
R981
C302
47/16
C911
C307
2.2
2.2/50
C327
22/16
QMFZ047-150-T
C306
C329
0.47/50
0.1
C305
0.1
0.10.10.10.1
C323C324C325C326
F1
Parts are safety assurance parts.
When replacing those parts make
47k
sure to use the specified one.
10K
R905
18K
R904
SHEET 1
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