SERVICE MANUAL
COMPACT COMPONENT SYSTEM
MB20820043
MX-SK3
(SP-XSSK3) (SP-XSSK3)
M X - S K 3
DISC
U
M
L
O
V
SELECT
E
SELECT
EJECTEJECT
(SP-XSK3)
SP-MXSK3
ON SCREEN
VIDEO INTRO
PREV. NEXT
SET
ENTER
PBC STILL KEY CONTROL
DISC
1
DISC 2DISC
REPEATPROGRAM RANDOM
SOUND
TAPE-A
TURBO
SOUND
KARAOKE MPX
MODE
ACTIVE
ECHO
BASS EX.
REMOTE CONTROL
FM MODE
REC
START/STOP
FADE
MUTING
STANDBY/ON
SLEEP
AUX
FM/AM
HIGHLIGHT
RETURN
DISC
3
PROGRAM
CANCEL
TAPE-B
VOLUME
COMPACT
(SP-XSK3)
SP-MXSK3
COMPACT
COMPACT
DIGITAL VIDEO
ACTIVE
BASS EX.
PHONES
CA-MXSK3
Area suffix
DIGITAL VIDEO
DIGITAL AUDIO
EE --------- Russian Federation
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-30
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-34
COPYRIGHT © 2004 VICTOR COMPANY OF JAPAN, LIMITED
No.MB208
2004/4
SPECIFICATION
Amplifier section CA-MXSK3
Output Power MAIN SPEAKERS 80 W per channel min. RMS both channels driven into
6 Ω at 1 kHz with no more than 0.9% total harmonic
distortion.
SURROUND SPEAKER 20 W per channel min. RMS both channels driven into
16 Ω at 1 kHz with no more than 0.9% total harmonic
distortion.
Audio input sensitivity/Impedance
(Measured at 1 kHz with tape recording signal 300 mV)
FM tuning range 87.50 MHz to 108.00 MHz
AM tuning range At 9 kHz intervals 531 kHz to 1 710 kHz
CD capacity 3 CDs
Dynamic range 85 dB
Signal-to-noise ratio 90 dB
Wow and flutter Immeasurable
Frequency response Normal (type I) 50 Hz to 14 000 Hz
Wow and flutter 0.15% (WRMS)
Power requirement AC 110 V / AC 127 V / AC 220 V / AC 230 V to AC 240 V (adjustable with the voltage selector)
Power consumption 50 Hz / 60 Hz
Dimensions (approx.) 270 mm x 306 mm x 433.5 mm (W/H/D)
Mass (approx.) 9.3 kg
Type 3-Way 3 Speaker Bass-Reflex (Magnetically-Shielded Type)
Speakers Main woofer 15cm cone x 1
Power Handling Capacity 100 W
Impedance 6 Ω
Frequency Range 42 Hz to 30 000Hz
Sound Pressure Level 84 dB/W.m
Dimensions (W x H xD) 215mm x 306 mm x 243 mm
Mass 3.4 kg
Type Full range bass-reflex type
Speakers Full range 8cm cone x 1
Power Handling Capacity 30 W
Impedance 16 Ω
Frequency Range 85 Hz to 20 000Hz
Sound Pressure Level 83 dB/W.m
Dimensions (W x H xD) 160mm x 110 mm x 136 mm
Mass 0.55 kg
Design & specifications are subject to change without notice.
AUX 400 mV/50 kΩ
MIC 3 mV/10 kΩ
Tuner
At 10 kHz intervals 530 kHz to 1 710 kHz
CD player
Cassette deck
General
100 W (at operation)
20 W (on standby)
Speaker Specifications
Mid Range 5.0cm cone x 1
Tweeter 2.0cm dome x 1
Speaker Specifications SP-XSSK3 (Surround Speaker)
1-2 (No.MB208)
SECTION 1
PRECAUTION
1.1 Safety Precautions
(1) This design of this product contains special hardware and
many circuits and components specially for safety purposes. For continued protection, no changes should be made
to the original design unless authorized in writing by the
manufacturer. Replacement parts must be identical to
those used in the original circuits. Services should be performed by qualified personnel only.
(2) Alterations of the design or circuitry of the product should
not be made. Any design alterations of the product should
not be made. Any design alterations or additions will void
the manufacturers warranty and will further relieve the
manufacture of responsibility for personal injury or property
damage resulting therefrom.
(3) Many electrical and mechanical parts in the products have
special safety-related characteristics. These characteristics are often not evident from visual inspection nor can the
protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special
safety characteristics are identified in the Parts List of Service Manual. Electrical components having such features
are identified by shading on the schematics and by ( ) on
the Parts List in the Service Manual. The use of a substitute
replacement which does not have the same safety characteristics as the recommended replacement parts shown in
the Parts List of Service Manual may create shock, fire, or
other hazards.
(4) The leads in the products are routed and dressed with ties,
clamps, tubings, barriers and the like to be separated from
live parts, high temperature parts, moving parts and/or
sharp edges for the prevention of electric shock and fire
hazard. When service is required, the original lead routing
and dress should be observed, and it should be confirmed
that they have been returned to normal, after reassembling.
(5) Leakage shock hazard testing
After reassembling the product, always perform an isolation check on the exposed metal parts of the product (antenna terminals, knobs, metal cabinet, screw heads,
headphone jack, control shafts, etc.) to be sure the product
is safe to operate without danger of electrical shock.Do not
use a line isolation transformer during this check.
• Plug the AC line cord directly into the AC outlet. Using a
"Leakage Current Tester", measure the leakage current
from each exposed metal parts of the cabinet, particularly any exposed metal part having a return path to the
chassis, to a known good earth ground. Any leakage current must not exceed 0.5mA AC (r.m.s.).
• Alternate check method
Plug the AC line cord directly into the AC outlet. Use an
AC voltmeter having, 1,000Ω per volt or more sensitivity
in the following manner. Connect a 1,500Ω 10W resistor
paralleled by a 0.15µF AC-type capacitor between an ex-
posed metal part and a known good earth ground.
Measure the AC voltage across the resistor with the AC
voltmeter.
Move the resistor connection to each exposed metal
part, particularly any exposed metal part having a return
path to the chassis, and measure the AC voltage across
the resistor. Now, reverse the plug in the AC outlet and
repeat each measurement. Voltage measured any must
not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5
mA AC (r.m.s.).
AC VOLTMETER
(Having 1000
ohms/volts,
or more sensitivity)
0.15 F AC TYPE
Place this
probe on
1500 10W
Good earth ground
1.2 Warning
(1) This equipment has been designed and manufactured to
meet international safety standards.
(2) It is the legal responsibility of the repairer to ensure that
these safety standards are maintained.
(3) Repairs must be made in accordance with the relevant
safety standards.
(4) It is essential that safety critical components are replaced
by approved parts.
(5) If mains voltage selector is provided, check setting for local
voltage.
1.3 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.
1.4 Critical parts for safety
In regard with component parts appearing on the silk-screen
printed side (parts side) of the PWB diagrams, the parts that are
printed over with black such as the resistor ( ), diode ( )
and ICP ( ) or identified by the " " mark nearby are critical
for safety. When replacing them, be sure to use the parts of the
same type and rating as specified by the manufacturer.
(This regulation dose not Except the J and C version)
each exposed
metal part.
(No.MB208)1-3
1.5 Preventing static electricity
Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser
diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.
1.5.1 Grounding to prevent damage by static electricity
Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as CD players.
Be careful to use proper grounding in the area where repairs are being performed.
(1) Ground the workbench
Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing the
traverse unit (optical pickup) on it.
(2) Ground yourself
Use an anti-static wrist strap to release any static electricity built up in your body.
(caption)
Anti-static wrist strap
1M
Conductive material
(conductive sheet) or iron palate
(3) Handling the optical pickup
• In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement optical
pickup are shorted. After replacement, return the shorted parts to their original condition.
(Refer to the text.)
• Do not use a tester to check the condition of the laser diode in the optical pickup. The tester's internal power source can easily
destroy the laser diode.
1.6 Handling the traverse unit (optical pickup)
(1) Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit.
(2) Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific details, refer to the
replacement procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to take too long
a time when attaching it to the connector.
(3) Handle the flexible cable carefully as it may break when subjected to strong force.
(4) I t is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.
1.7 Attention when traverse unit is decomposed
*Please refer to "Disassembly method" in the text for the CD pickup unit.
• Apply solder to the short land sections before the flexible wire is disconnected from the connecto on the CD servo board. (If the
flexible wire is disconnected without applying solder, the CD pickup may be destroyed by static electricity.)
• In the assembly, be sure to remove solder from the short land sections after connecting the flexible wire.
1-4 (No.MB208)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.
(No.MB208)1-5
SECTION 3
AA
DISASSEMBLY
3.1 Main body
3.1.1 Removing the metal cover
(See Fig.1~3)
(1) Remove the six screws A on the back of the main body.
(2) Remove the four screws B on each side of the body.
(3) Remove the metal cover from the body by lifting the rear
part of the cover.
CAUTION :
Do not break the front panel tab fitted to the metal cover.
A
B
Fig.1
Fig.2
B
1-6 (No.MB208)
Fig.3
3.1.2 Removing the CD fitting
(See Fig.4~6)
• Prior to performing the following procedure, remove the metal
cover.
ATTENTION :
Be sure to remove the CD tray fitting before removing the
CD changer unit.
(1) Press the STANDBY button. Press the OPEN/CLOSE but-
ton to eject the CD trey.
(2) Move the CD trey fitting upward and release the joint a.
(3) Press the OPEN/ CLOSE button to insert the tray.
CD tray
STANDBY / ON button
CD tray fitting
Joint
OPEN / CLOSE button
Fig.4
a
Joint a
CD tray
Fig.5
Fig.6
(No.MB208)1-7
3.1.3 Removing the CD fitting
(See Fig.5~7)
• How to eject the CD trey without turning on power.
(1) Turn the loading pulley gear marked b from the back of
the CD changer unit as shown in Fig.7 and draw the CD
tray toward the front.
(2) Move the CD tray fitting upward and release the joint a.
(3) Push and insert the CD tray manually.
3.1.4 Removing the CD changer unit
(See Fig.8 ~10)
• Prior to performing the following procedure, remove the metal
cover and the CD fitting.
(1) Disconnect the wire from connector CN13
board.
(2) On the right side of the body, disconnect the card wire from
connector CN651
changer unit.
(3) Remove the four screws D attaching the CD changer unit
on both sides of the body.
(4) Remove the three screws E on the back of the body.
(5) Move the CD changer unit in the direction of the arrow with
pulling the rear panel and the front panel assembly out-
ward.
CD changer unit
on the CD board in the bottom of the CD
on the main
Rear panel
D
Rear panel
CN651
Marked
Loading pulley gear
Fig.7
Main borad
(CN13)
Fig.9
b
CD changer unit
D
Front panel assembly
Front panel assembly
1-8 (No.MB208)
Main borad
(CN13)
Fig.8
E
E
CN651
Rear panel
Fig.10
3.1.5 Removing the CD board
(See Fig.11~13)
• Prior to performing the following procedure, remove the metal
cover and the CD changer unit.
Caution :
Before disconnecting the card wire extending from the CD
pickup, make sure to solder the short-circuit point on the CD
pickup(Fig.12 and 13). If you do not follow this instruction,
the CD pickup may be damaged.
(1) Remove the four screws F attaching the CD board on the
bottom of the CD changer unit.
(2) Turn and move the CD board as shown in Fig.12.
(3) Disconnect the wire from the CD mechanism board.
(4) Solder the short-circuit point on the CD pickup section.
(5) Disconnect the card wire from CN601
Caution :
When reassembling, unsolder the short-circuit point after connecting the card wire to CN601
on the CD board.
on the CD board.
CD changer unit
CD board
FF
CD mechanism board
Fig.11
CD mechanisum board
Short round
(Short-circuit)
Pick up
CD board (CN601)
Fig.12
Card wire
Short round
(short-circuit)
Fig.13
(No.MB208)1-9
3.1.6 Removing the front panel assembly
(See Fig.14~16)
• Prior to performing the following procedure, remove the metal
cover and the CD changer unit.
(1) Disconnect the card wire from the connector CN315,
and CN870 on the main board.
CN316
(2) Disconnect the wire from connector CN702
board and remove the band attaching the wire to the main
board.
(3) Disconnect the wire from the connector CN214
transformer board.
(4) Remove the two screws G attaching the front panel as-
sembly on the bottom of the body.
(5) Remove the two joints d and e on the lower part of the
sides using a screwdriver, and remove the front panel assembly toward the front.
on the speaker
on power
Front panel assembly
Main board
CN870
CN316
CN315
Band
d
Power transformer board
CN214
Front panel assembly
Speaker board
CN702
Fig.14
Front panel assembly
e
Fig.15
G
1-10 (No.MB208)
Fig.16
3.1.7 Removing the tuner pack assembly
(See Fig.17~18)
• Prior to performing the following procedure, remove the metal
cover and the CD changer unit.
(1) Disconnect the card wire from the connector CN1
tuner pack assembly on the right side of the body.
(2) Remove the two screws H on the rear panel on the back
of the body.
on the
Rear panel
Tuner pack
(CN1)
AUX & surround board
Fig.17
H
Rear panel
Fig.18
(No.MB208)1-11
3.1.8 Removing the AUX & surround board
(See Fig.19, 20)
• Prior to performing the following procedure, remove the metal
cover and the CD changer unit.
(1) Disconnect the card wire from the connector CN411,
on the on the AUX & surround board on the right
CN711
side of the body.
(2) Remove the two screws J on the rear panel on the back
of the body.
Rear panel
Tuner pack
AUX & surround board
(CN411)
AUX & surround board
(CN7Z11)
Fig.19
Rear panel
J
Fig.20
1-12 (No.MB208)
3.1.9 Removing the rear panel
(See Fig.21~25)
• Prior to performing the following procedure, remove the metal
cover and the CD changer unit.
(1) Disconnect the wire from the connector CN1
pack assembly on the right side of the body.
(2) Disconnect the wire from the connector CN411
the AUX surround board.
(3) Remove the screw K attaching the rear cover on the back
of the body.
(4) Remove the two screws L attaching the speaker board,
and the two screws M attaching the power transformer
board on the back of the body.
(5) Remove the four screws N attaching the heat sink on the
back of the body.
(6) Remove the screw P attaching the rear cover on the back
of the body.
(7) Release the two joints f and g on the bottom of the rear
panel using the screw driver, then detach the rear panel
backward.
Reference: The rear panel comes off with the tuner pack
assembly and the AUX surround board.
on the tuner
, CN711 on
Heat sink
N
Rear panel
M
Rear panel
Tuner pack
AUX & surround board
AUX & surround board
(CN711)
Fig.21
K
Rear panel
(CN1)
(CN411)
L
NP
Fig.23
Rear panel
f
Fig.24
Rear panel
Rear cover
Fig.22
f
Fig.25
(No.MB208)1-13
3.1.10 Removing the main board / speaker board
(See Fig. 26~29)
• Prior to performing the following procedure, remove the metal
cover and the CD changer unit, the rear panel.
(1) Disconnect the card wire from the connector CN315,
and CN870 on the main board.
CN316
(2) Disconnect the wires from connector CN202
on the speaker board. Remove the band attaching the wire
to the main board.
(3) Remove the screw Q attaching the main board and the
screw R attaching the speaker board.
(4) Move the speaker board in the direction of the arrow to re-
lease from the base chassis at the joint h and the two
joints j.
Reference:
The speaker board comes off with the main board and
the heat sink.
(5) Remove the screw T and the three screws U attaching the
heat sink. The heat sink comes off with the heat sink bracket.
(6) Detach the main board from connector CN701
speaker board.
Main board
and CN702
on the
Band
Q
Main board
h
Heat sink
Speaker board
R
Fig.27
CN870
CN315
CN316
Band
CN202
Fig.26
Speaker board
CN702
Main board
T
U
Heat sink
j
Heat sink
j
Speaker board
R
Fig.28
Main board
U
1-14 (No.MB208)
CN701
Speaker board
Fig.29
3.1.11 Removing the power transformer assembly
(See Fig.30~32)
• Prior to performing the following procedure, remove the metal
cover, and the CD changer unit, the rear panel, the speaker
board.
(1) Disconnect the wire from connector CN21
transformer board.
(2) Remove the screw A' attaching the power transformer
board on the left side of the body.
(3) Remove the four screws B' attaching the power transform-
er board.
(4) Push the cord stopper upward and remove.
(5) Disconnect the power cord from connector CN250
power transformer board and remove the band.
(6) Remove the power transformer assembly upward.
on the power
on the
CN214
Power transfomer board
CN250
B'
Power transfomer assembly
Fig.30
Power transfomer board
Fig.31
Power transfomer board
B'
CN214
A'
CN250
Power cord stopper
Fig.32
Power cord
(No.MB208)1-15
3.2 Front panel assembly
• Prior to performing the following procedure, remove the metal cover, the CD changer unit and the front panel assembly.
3.2.1 Removing cassette mechanism assembly
(See Fig.33,34)
(1) Remove the eight screws D' attaching the cassette mech-
anism assembly.
3.2.2 Removing the LCD board
(See Fig.34)
(1) Disconnect the card wire from the connector CN880
LCD board.
(2) Remove the nine screws E' attaching the LCD board.
on the
Front panel assembly
D'D'
Cassett mechanism assembly
Fig.33
D'D'
E'
CN880
E'
Cassett mechanism assembly
Fig.34
LCD board
E'
Swithc board
1-16 (No.MB208)
3.2.3 Removing the switch board
(See Fig.35,36)
• Prior to performing the following procedure, remove the LCD
board.
(1) Pull out the MIC level knob from the front of the front panel
assembly.
(2) Remove the two screws D' attaching the two wires on the
bottom of the front panel assembly.
(3) Remove the seventeen screws F' attaching the switch
board.
(4) Unsolder the wire on the switch board at FW800 point.
Front panel assembly
MIC level knob
Fig.35
Volume board
FW800
F'
F'
D'
ޓ Swithc board
Cassette mechanism assembly
Fig.36
F'
F'
D'
(No.MB208)1-17
3.2.4 Removing the volume board
(See Fig.37,38)
• Prior to performing the following procedure, remove the LCD
board and the switch board.
(1) Pull out the volume knob from the front of the front panel
assembly.
(2) Remove the nut from the front panel assembly.
(3) Release the volume board from the tab and remove.
Front panel assembly
Nut
Volume knob
Fig.37
Ta b
Volume board
Fig.38
Ta b
1-18 (No.MB208)
3.3 CD changer unit
r
• Prior to performing the following procedure, remove the CD changer unit.
3.3.1 Removing the CD tray
(See Fig.39~45)
(1) Turn the loading pulley gear on the under side of the CD
changer unit in the direction of the arrow and draw the CD
tray toward the front until it stops.
(2) Disconnect the card wire from connector CW2
board on the upper side of the CD changer unit.
(3) Push down the two tray stoppers and pull out the CD tray.
Reference:
When reassembling, set each gear as shown in Fig.42 and insert the CD trays as shown in Fig.43.
of the motor
CD tray
Loading
pulley gear
CD Tray
Tray stoppe
Tray stopper
Motor board
CW2
Fig.41
CD tray
Fig.39
Fig.40
CLOSE
OPEN
Fig.42
CD tray
Fig.43
(No.MB208)1-19
mn
r
Tray motor
Sensor board
CD tray
Connecto
Ta b
Fig.44
n
1-20 (No.MB208)
Spacer
m
Fig.45
3.3.2 Removing the sensor board / tray motor
(See Fig.44~47)
• Prior to performing the following procedure, remove the CD
tray.
(1) Release the two tabs attaching the sensor board on the un-
der side of the DC tray.
(2) Disconnect the wire from connector on the sensor board.
(3) Pull out the spacer attaching the turn table at the part m.
(4) Push the tab of part m inward to release the turn table
from the CD tray.
(5) Push the tab of part n inward to release the gear from the
CD tray.
(6) On the upper side of the CD tray, extend the tab p attach-
ing the tray motor and remove the tray motor in the direc-
tion of the arrow.
Turn table
CD Tray
Gear
Fig.46
Tray motor
Fig.47
Tab p
(No.MB208)1-21
3.3.3 Removing the belt / motor board / switch board
(See Fig. 48~50)
• Prior to performing the following procedure, remove the CD
tray.
(1) Detach the belt from the pulley on the upper side of the CD
changer unit (Do not stain the belt with grease).
(2) Release the three tabs q and the three tabs r upward on
the backside of the CD changer unit.
(3) Release the three tabs t attaching the switch board.
(4) Unsolder the two soldering on the motor board and remove
the motor.
Belt
CD changer unit
Fig.48
Motor board
Switch board
Solder section
r
gg
r
g
Fig.49
t
1-22 (No.MB208)
Switch board
t
Fig.50
3.3.4 Removing the CD mechanism holder assembly (mechanism included)
(See Fig.51~53)
(1) On the bottom of the CD changer unit, turn the loading pul-
ley gear in the direction of the arrow and move the CD
mechanism holder assembly as shown in Fig. 52.
(2) Pull outward the two stoppers setting the shafts on both
sides of the CD mechanism holder assembly, and remove
the CD mechanism holder assembly in the direction of the
arrow.
Loading
pulley gear
Stopper
CD mechanism
holder assembly
Fig.51
Loading
pulley gear
Stopper
Fig.52
List map slide shaft
Fig.53
CD mechanism
holder assembly
CD mechanism
holder assembly
(No.MB208)1-23
3.3.5 Remove the CD mechanism assembly
(See Fig.54,55)
• Prior to performing the following procedure, remove the CD
mechanism holder assembly.
(1) Remove the four screws G' attaching the CD mechanism
assembly.
(2) Remove the four insulators.
Caution:
When reassembling, attach the insulator to the correct position.
CD mechanism
G'
CD mechanism
holder assembly
Fig.54
CD mechanism
Insulator (green) Insulator (red)
Insulator (green) Insulator (red)
Fig.55
G'
1-24 (No.MB208)
3.4 Cassette mechanism assembly
3.4.1 Removing the R/P & E head
(See Fig. 1 to Fig. 3)
(1) While shifting the trigger arms seen on the right side of the
head mount in the arrow direction, turn the flywheel ( R ) in
counterclockwise direction until the head mount has gone
out with a click (See Fig. 1).
(2) When the flywheel (R) is rotated in counterclockwise
direction, the playback / recording & eraser head will be
turned in counterclockwise direction from the position in
Fig. 2 to that in Fig. 3.
(3) At this position, disconnect the flexible board (outgoing
from the playback / recording & eraser head) from the
connector CN31
control board.
(4) Remove the flexible board from the chassis base.
(5) Remove the spring a from behind the playback / recording
& eraser head.
(6) Loosen the reversing azimuth screw retaining the playback
/ recording & eraser head.
(7) Take out the playback / recording & eraser head from the
front of the head mount.
(8) The playback / recording & eraser head should also be
removed similarly to steps 1 to 7 above.
on the head amplifier & mechanism
Cassette mechanism
Head mount
Playback head
Flexible board
Fly
wheel R
Trigger arm
(A mechanism side)
Fig.1
Spring a
Trigger arm
CN301
Head amp. & Mechanism
control board
R/P E head
Spring a
CN302
FPC holder
Flywheel R
(A mechanism side)
Fig.2
Reverse
Azimuth screw
Head mount
Flexible board
Head amp. & mechanism
control board
(B mechanism side)
Fig.3
(No.MB208)1-25
3.4.2 Reassembling the playback / recording & eraser head
(See Fig. 4 to Fig. 6)
(1) Keep the direction lever of head mount assembly to left
side (head direction is forward direction).
(2) Fix the head mount assembly boss O', P', Q', U' and V' to
mechanism sub assembly hole P, V and ditch O, U and Q
(See Fig. 4 and Fig. 5).
(3) Fix the reversing azimuth screw.
(4) Attaching the spring a from back side of playback /
recording & eraser head.
(5) Attaching the flexible board to the chassis base.
O'
P'
V'
O
P
R/P & E head
or PB head
Q'U'
Head mount assembly
Fig.4
Head mount assembly
Q
U
Fig.5
Reverse
azimuth screw
Direction
lever
Direction
cover
1-26 (No.MB208)
Spring a
Flexible
board
FPC holder
A:CN301
B:CN302
Fig.6
Head mount
Head amp. & mechanism
control board
3.4.3 Removing the head amplifier & mechanism control board
(See Fig. 7)
(1) Remove the cassette mechanism assembly
(2) After turning over the cassette mechanism assembly,
remove the three screws 1 retaining the head amplifier &
mechanism control board.
(3) Disconnect the connector CN301
CN304 on the board including the CN1 on the reel pulse
board.
(4) When necessary, remove the 4 pin parallel wire soldered
to the capstan motor.
, CN302, CN303 and
Head amp. & mechanism
11 1
control board
CN301CN302
3.4.4 Removing the capstan motor assembly
(See Fig. 8 to Fig. 10)
(1) Removing the 6 screws 2 retaining the capstan motor
assembly.
(2) While raising the capstan motor, remove the capstan belt
from the motor pulley.
Caution:
Be sure handle the capstan belt so carefully that this belt will
not be stained by grease and other foreign matter. Moreover,
this belt should be hanged while referring to the capstan belt
handling method in Fig. 9 and Fig. 10.
Flexible
board
Flexible
board
Fig.7
22
Capstan motor
assembly
11
2222
Fig.8
Capstan belt A Capstan belt B
Fig.9
Capstan motor
Capstan belt BCapstan belt A
Motor pulley
Fig.10
(No.MB208)1-27
3.4.5 Removing the capstan motor
(See Fig. 11)
(1) Remove the two screws 3 from the capstan motor, and
then remove the joint bracket.
3.4.6 Removing the flywheel
(See Fig. 12, Fig. 13)
(1) Remove the head amplifier & mechanism control board.
(2) Remove the capstan motor assembly.
(3) After turning over the cassette mechanism, remove the two
slit washers and fixing capstan shaft L and R, and pull out
the flywheel (R) and (L) respectively from behind the
cassette mechanism.
3
Capstan motor
Joint
bracket
3
Fig.11
3.4.7 Removing the reel pulse board and solenoid
(See Fig. 14)
(1) Remove the five pawls d to h retaining the reel pulse board.
(2) From the surface of the reel pulse board parts, remove the
two pawls i and j retaining the solenoid.
Solenoid
Flywheel R Flywheel L
Flywheel R
Capstan
shaft R
b
Slit washer
hd e f g
Fig.12
Flywheel L
Capstan
shaft L
c
Slit washer
Fig.13
Reel pulse
board
1-28 (No.MB208)
Solenoid
Fig.14
3.4.8 Reassembling the control cam
(See Fig. 15 to Fig. 17)
(1) Shift to left side (forward direction) the head mount
assembly, hole K’ of control cam into the hollow K of the
mechanism sub assembly.
Control cam
K'
(hole)
K
Fig.15
Mechanism sub
assembly (top side)
K
K
(hole)
Fig.16
Control cam (top side)
Fig.17
(No.MB208)1-29
SECTION 4
ADJUSTMENT
4.1 Measurement instruments required for adjustment
(1) Low frequency oscillator,
This oscillator should have a capacity to output 0dBs to
600ohm at an oscillation frequency of 50Hz-20kHz.
(2) Attenuator impedance : 600ohm
(3) Electronic voltmeter
(4) Frequency counter
(5) Wow flutter meter
(6) Test tape
VT712 : For Tape speed and wow flutter ( 3kHz)
VT710 : Head azimuth
VT724 : For Reference level (1kHz)
(7) Blank tape
TAPE : AC-225
(8) Torque gauge : For play and back tension
Forward ; TW2111A, Reverse ; TW2121A
Fast Forward and Rewind ; TW2231A
(9) Test disc
: CTS-1000(12cm),GRG-1211(8cm)
(10) Jitter meter
4.2 Measurement conditions
Power supply voltage
AC110V/127V/220V/230V to 240V, adjustable
Measurement output terminal
: Speaker out
: TP101(Mesuring for TUNER/DECK/CD)
: Dummy load 6ohm
Radio input signal
AM modulation frequency : 400Hz
Modulation factor : 30%
FM modulation frequency : 400Hz
Frequency displacement : 22.5kHz
Standard measurement positions of volume and switch
Power : Standby (Light STANDBY Indicator)
Sub woofer VOL. : Minimum
Sound mode : OFF
Main VOL. : 0 Minimum
Traverse mecha set position : Disc 1
Mic MIX VOL : MAX
ECHO : OFF
Precautions for measurement
(1) Apply 30pF and 33kohm to the IF sweeper output side
and 0.082 F and 100kohm in series to the sweeper input
side.
(2) The IF sweeper output level should be made as low as
possible within the adjustable range.
(3) Since the IF sweeper is a fixed device, there is no need
to adjust this sweeper.
(4) Since a ceramic oscillator is used, there is no need to
perform any MPX adjustment.
(5) Since a fixed coil is used, there is no need to adjust the
FM tracking.
(6) The input and output earth systems are separated.
In case of simultaneously measuring the voltage in both
of the input and output systems with an electronic voltmeter for two channels, therefore, the earth should be
connected particularly.
(7) In the case of BTL connection amplifier, the minus termi-
nal of speaker is not for earthing. Therefore, be sure not
to connect any other earth terminal to this terminal. This
system is of an OTL system.
1-30 (No.MB208)
4.3 Arrangement of adjusting positions
Cassette mechanism section (Mechanism A section)
Head azimuth
adjusting screw
(Forward side)
Playback
head
Head azimuth
adjusting screw
(Reverse side)
Cassette mechanism section (Back side)
Head azimuth
adjusting screw
(Forward side)
Playback, recording and eraser
heads or playback head
Head azimuth
adjusting screw
(Reverse side)
Cassette Mechanism Unit Section
Front panel assembly
Head amplifier &
Mechanism control board
VR301 Tape speed ADJ
BIAS TP
VR101 Bias ADJ L
VR201 Bias ADJ R
(No.MB208)1-31
4.4 Tape recorder section
Items
Measurement
conditions
Confirmation
of head angle
Test tape
:VT710 (10kHz)
Measurement
output terminal
:Speaker terminal
Speaker R
(Load resistor:6 )
:Headphone terminal
1.Playback the test tape VT710 (10kHz).
2.With the playback mechanism or recording &
playback mechanism, adjust the head azimuth
screw so that the forward and reverse output
levels become maximum.After adjustment,lock
the head azimuth at least by half a turn.
3.In either case,this adjustment should be
performed in both the forward and reverse
directions with the head azimuth screw.
Confirmation
of tape speed
Test tape
:VT712 (3kHz) or
TMT7036 (3kHz)
Measurement
output terminal
:Headphone terminal
<Constant speed>
Adjust VR301 so that the frequency counter reading
becomes 3,000Hz 60Hz when playing back the
test tape VT712 (3kHz)with the playback mechanism
or playback and recording mechanism after ending
forward winding of the tape.
4.5 Reference values for confirmation items
Items
Measurement
conditions
Double tape
speed
Test tape
:VT712 (3kHz)
Measurement
output terminal
:Speaker terminal
After setting to the double speed motor, confirm
that the frequency counter reading becomes
4,800+400/-300Hz when the test tape VT712
(3kHz) has been play back with the playback
mechanism.
Speaker R
(Load resistance:6 )
measurement
output terminal
:Headphone terminal
Measurement method
Measurement method
Standard
values
Maximum
output
Tape speed
of decks
(A and B)
:3,000Hz
60Hz
Standard
values
4,800+400/
-300Hz
Adjusting
positions
Adjust the head
azimuth screw
only when the
head has been
changed.
VR301
Adjusting
positions
Playback
mechanism side
Difference
between the
forward and
reverse speed.
P.mecha and
R/P mecha
speed
Wow & flutter
1-32 (No.MB208)
Test tape
:VT712 (3kHz)
Measurement
output terminal
:Headphone terminal
When the test tape VT712 (3kHz) has been played
back with the playback mechanism or recording and
playback mechanism at the beginning of forward
winding, the frequency counter reading of the
difference between both of the mechanisms should
be 6.0Hz or less.
When the test tape VT712 (3kHz) has been played
back with the playback mechanism or recording and
playback mechanism at the beginning of forward
winding the frequency counter reading of wow &
flutter should be 0.25% or less(WRMS).
60Hz or
less
with in
0.25%
JIS(WTD)
Both the playback
and recording &
playback
mechanism
Both the playback
and recording &
playback
mechanism
4.6 Electrical performance
Items
Adjustment of
recording bias
current
(Reference
value)
Adjustment of
recording and
playback
frequency
characteristics
Measurement
conditions
*Mode : Forward or
reverse mode
*Recording mode
*Test tape
: AC-225
Measurement output
terminal
:Both recording and
headphone terminals
Reference frequency
:1kHz and 10kHz
(REF:-20dB)
Test tape
:TYP AC-225
Measurement input
terminal
:OSC IN
Measurement method
1.With the recording and playback mechanism,
load the test tapes(AC-225 to TYP ),and set the
mechanism to the recording and
pausing conditions in advance.
2.After connecting 100 in series to the recorder
head,measure the bias current with a valve
voltmeter at both of the terminals.
3.After resetting the [PAUSE] mode,start recording.
At this time,adjust VR101 for LcH and VR201 for
RcH so that the recording bias current values
become 4.0 A (TYP ).
1.With the recording and playback mechanism,load
the test tape(AC-225 to TYP ),and set the
mechanism to the recording and pausing condition
in advance.
2.While repetitively inputting the reference frequency
signal of 1kHz and 10kHz from OSC IN, record and
playback the test tape.
3.While recording and playing back the test tape in
TYP ,adjust VR101 for LcH and VR201 for RcH
so that the output deviation between 1kHz and
10kHz becomes -1dB 2dB.
Standard
values
AC-225
:4.20 A
Output
deviation
between
1kHz and
10kH
:-1dB 2dB
Adjusting
positions
LcH
:VR101
RcH
:VR201
LcH
:VR101
RcH
:VR201
4.7 Reference values for electrical function confirmation items
Items
Recording
bias frequency
Eraser current
(Reference
value)
Measurement
conditions
*Recording and
playback side forward
or reverse
*Test tape
:TYP AC-225
*Measurement
terminal BIAS TP on
P.C.board
*Recording and
playback side forward
or reverse
*Recording mode
*Test tape
:AC-225
Measurement terminal
Both of the eraser
Measurement method
1.While changing over to and from BIAS 1 and 2,
confirm that the frequency is changed.
2.With the recording and playback mechanism.
load the test tape (AC-225 to TYP ),and set the
mechanism to the recording and pausing
conditions in advance.
3.Confirm that the BIAS TP frequency on the
P.C.board is 100kHz 6kHz.
1.With the recording and playback mechanism,
load the test tapes(AC-225 to TYP ),and set the
mechanism to the recording and pausing condition
in advance.
2.After setting to the recording conditions,connect
1M
in series to the eraser head on the recording
and playback mechanism side,and measure the
eraser current from both of the eraser terminal.
head
Standard
values
100kHz
+9kHz
-7kHz
TYP
:75mA
Adjusting
positions
(No.MB208)1-33
SECTION 5
TROUBLESHOOTING
This service manual does not describe TROUBLESHOOTING.
1-34 (No.MB208)
(No.MB208)1-35
VICTOR COMPANY OF JAPAN, LIMITED
AV & MULTIMEDIA COMPANY AUDIO/VIDEO SYSTEMS CATEGORY 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan
(No.MB208)
Printed in Japan
WPC
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