JVC RV-NB10BJ, RV-NB10BC, RV-NB10BB, RV-NB10BEV, RV-NB10WJ Service Manual
...
SERVICE MANUAL
POWERED WOOFER CD SYSTEM
MB51920063
RV-NB10BJ,RV-NB10BC,RV-NB10BB,
RV-NB10BE,RV-NB10BEN,RV-NB10BEV,
RV-NB10WJ,RV-NB10WC,RV-NB10WB,
RV-NB10WE,RV-NB10WEN
Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26
5 TROUBLE SHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-29
COPYRIGHT © 2006 Victor Company of Japan, Limited
TABLE OF CONTENTS
No.MB519
2006/3
SPECIFICATION
Amplifier Output Power United States and Canada 6 W per channel, min. RMS, at 4Ω from 150 Hz to 15kHz with no more
than 10% total harmonic distortion.
20 W per channel woofer, min. RMS into 4Ω at 60 Hz with no more
than 10% total harmonic distortion.
Other countries [Max.]
20 W (10 W + 10 W) at 4Ω (full range), 40 W (20 W + 20 W) at 4Ω,
60 Hz (woofer)
[10% THD]
10 W (5 W + 5 W) at 4Ω (full range), 30 W (15 W + 15 W) at 4Ω, 60
Hz (woofer)
Input Sensitivity/Impedance (1 kHz) AUX IN : 300 mV/47 kΩ
MIC/GUITAR INPUT:
Switchable
Output Sensitivity/Impedance (1 kHz) Phones : 16Ω - 1 kΩ
Cassette Deck Frequency Response : Type II (High position) 60 Hz - 14 kHz
Wow and Flutter 0.15% (WRMS)
Disc Player Dynamic range 90 dB
Signal-to-noise ratio 95 dB
Wow and Flutter Unmeasurable
Tuner WIRELESS (Only the United States and Canada) 87.50 MHz - 108.00 MHz
FM Tuner 87.50 MHz - 108.00 MHz
AM Tuner United States and Canada 530 kHz - 1 710 kHz
Antenna United States and Canada FM telescopic antenna
Speakers Full range 8 cm (3-3/16")×2, 4Ω
Super woofer 16 cm (6-5/16")×2, 4Ω
Wireless Transmitter
(VFT-001)
(Only the United States and
Canada)
General Dimensions 690 mm×239 mm×296 mm (W/H/D) (27-3/16"×9-7/16"×11-11/16”)
Power Specifications Power Requirements United States and Canada AC 120 V , 60 Hz
Power Requirements DC 3 V ("R6/AA(15F)" batteries [2])
Transmitting Frequencies 88.10 MHz, 88.30 MHz, 88.50 MHz, 88.70 MHz, 107.10 MHz, 107.30
Input terminal Stereo mini plug
Frequency response 50 Hz to 12 000 Hz
Battery life (at normal temperature) Approx. 50 hours (with Alkaline batteries)
Dimensions 78 mm×55 mm×35 mm (W/H/D) (3-1/8"×2-3/16"×1-7/16")
Mass Approx. 50 g (0.12 lbs) (without batteries)
Mass 9.5 kg (21 lbs) (without batteries)
Power Consumption United States and Canada 50 W (power on mode)
MIC 200Ω - 2 kΩ (6.3 mm dia. plug)
GUITAR 100 kΩ - 1 MΩ (6.3 mm dia. plug)
0 - 12 mW/ch output into 32Ω
Other countries (MW) 522 - 1 629 kHz
(LW) 144 - 288 kHz
Ferrite core antenna for AM
Other countries FM telescopic antenna
Ferrite core antenna for AM (MW/LW)
MHz, 107.50 MHz, 107.70 MHz
Approx. 20 hours (with Manganese batteries)
10.6 kg (23.4 lbs) (with batteries)
DC 15 V ("R20/D(13F)" batteries [10])
External DC 12 V (car battery via optional CA-R120 car adapter)
Other countries AC 230 V , 50 Hz
DC 15 V ("R20/D(13F)" batteries [10])
External DC 12 V (car battery via optional car adapter)
1.6 W (in standby mode)
Other countries 43 W (power on mode)
1.6 W (in standby mode)
Design and specifications are subject to change without notice.
1-2 (No.MB519)
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.MB519)1-3
1.5 Safety Precautions (U.K only)
(1) This design of this product contains special hardware and many circuits and components specially for safety purposes. For con-
tinued 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.
(2) Any unauthorised design alterations or additions will void the manufacturer's guarantee; furthermore the manufacturer cannot
accept responsibility for personal injury or property damage resulting therefrom.
(3) Essential safety critical components are identified by ( ) on the Parts List and by shading on the schematics, and must never
be replaced by parts other than those listed in the manual. Please note however that many electrical and mechanical parts in
the product have special safety related characteristics. These characteristics are often not evident from visual inspection. Parts
other than specified by the manufacturer may not have the same safety characteristics as the recommended replacement parts
shown in the Parts List of the Service Manual and 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 re-assembling.
1.5.1 Warning
(1) Service should be performed by qualified personnel only.
(2) This equipment has been designed and manufactured to meet international safety standards.
(3) It is the legal responsibility of the repairer to ensure that these safety standards are maintained.
(4) Repairs must be made in accordance with the relevant safety standards.
(5) It is essential that safety critical components are replaced by approved parts.
(6) If mains voltage selector is provided, check setting for local voltage.
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 (No.MB519)
1.6 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.
1.6.1 Grounding to prevent damage by static electricity
Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as laser products.
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.
1.7 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.
1.8 Attention when traverse unit is decomposed
*Please refer to "Disassembly method" in the text for the pickup unit.
• Apply solder to the short land sections before the flexible wire is disconnected from the connecto on the servo board. (If the flexible
wire is disconnected without applying solder, the 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.
CD pickup
Connector
Short land
section
Card wire
(No.MB519)1-5
1.9 Important for laser products
!
1.CLASS 1 LASER PRODUCT
2.DANGER : Invisible laser radiation when open and inter
lock failed or defeated. Avoid direct exposure to beam.
3.CAUTION : There are no serviceable parts inside the
Laser Unit. Do not disassemble the Laser Unit. Replace
the complete Laser Unit if it malfunctions.
4.CAUTION : The CD,MD and DVD player uses invisible
laser radiation and is equipped with safety switches which
prevent emission of radiation when the drawer is open and
the safety interlocks have failed or are defeated. It is
dangerous to defeat the safety switches.
5.CAUTION : If safety switches malfunction, the laser is able
to function.
6.CAUTION : Use of controls, adjustments or performance of
procedures other than those specified here in may result in
hazardous radiation exposure.
Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.
REPRODUCTION AND POSITION OF LABELS
WARNING LABEL
CAUTION : Visible and Invisible
laser radiation when open and
interlock failed or defeated.
AVOID DIRECT EXPOSURE TO
BEAM. (e)
CLASS 1
LASER PRODUCT
ADVARSEL : Synlig og usynlig
laserstråling når maskinen er
åben eller interlocken fejeler.
Undgå direkte eksponering til
stråling. (d)
CAUTION : Visible and Invisible
laser radiation when open and
interlock failed or defeated.
AVOID DIRECT EXPOSURE TO
BEAM. (e)
VARNING : Synlig och
osynling laserstrålning när
den öppnas och spärren är
urkopplad. Betrakta ej
strålen. (s)
VARNING : Synlig och
osynling laserstrålning när
den öppnas och spärren är
urkopplad. Betrakta ej
strålen. (s)
VARO : Avattaessa ja suojalukitus
ohitettuna tai viallisena olet alttiina
näkyvälle ja näkymättömälle
lasersäteilylle. Vältä säteen
kohdistumista suoraan itseesi. (f)
ADVARSEL : Synlig og usynlig
laserstråling når maskinen er
åben eller interlocken fejeler.
Undgå direkte eksponering til
stråling. (d)
VARO : Avattaessa ja suojalukitus
ohitettuna tai viallisena olet alttiina
näkyvälle ja näkymättömälle
lasersäteilylle. Vältä säteen
kohdistumista suoraan itseesi. (f)
1-6 (No.MB519)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.
(No.MB519)1-7
SECTION 3
DISASSEMBLY
3.1 Main body
3.1.1 Removing the rear cabinet
(See Fig.1 to 3)
(1) Remove the six screws A (both side) attaching the side
protector by 6 angle wrench. (See Fig.1)
(2) Remove the eight screws B (both side) attaching the woof-
er, and then disconnect the speaker wires. (See Fig.2)
(3) Remove the ten screws C attaching the rear cabinet, and
then disconnect the grand wire from tuner board. (See
Fig.3)
AA
Fig.1
BB
Fig.2
E
1-8 (No.MB519)
C
CK
Fig.3
3.1.2 Removing the cassette mechanism assembly
(See Fig.4 and 5)
(1) Remove the four screws D attaching the cassette mecha-
nism. (See Fig.4)
(2) Disconnect the card wires connected to CN33
from display control board. (See Fig.5)
and CN34
D
Fig.4
CN33 CN34
Fig.5
(No.MB519)1-9
3.1.3 Removing the CD mechanism assembly
(See Fig.3 and 6)
(1) Remove the two screws E attaching the CD mechanism
assembly. (See Fig.3)
(2) Disconnect the card wire connected to CN403 from tuner
board. (See Fig.6)
(3) Disconnect the card wires connected to CN407
from equalizer amp board. (See Fig.6)
and CN408
Tuner boaard
CN407CN408
3.1.4 Removing the equalizer amp board
(See Fig.7)
(1) Remove the four screws F attaching the equalizer amp
board. (See Fig.7)
CN403
Equalizer amp board
Fig.6
1-10 (No.MB519)
FF
Fig.7
3.1.5 Removing the power supply board
(See Fig.8 and 9)
(1) Disconnect the connector wires connected to CN194
from power transformer. (See Fig.8)
CN195
(2) Disconnect the connector wires connected to CN191 and
from power amplifier board. (See Fig.8)
CN193
(3) Remove the two screws G attaching the power supply
board. (See Fig.9)
and
CN194
CN195
Fig.8
CN193
G
CN191
Fig.9
(No.MB519)1-11
3.1.6 Removing the power transformer
(See Fig.10)
(1) Remove the four screws H attaching the power transform-
er.
3.1.7 Removing the power amplifier board
(See Fig.3, 10 and 11)
(1) Remove the two screws J attaching the cover. (See Fig.10)
(2) Remove the four screws K attaching the heat sink cover.
(See Fig.3)
(3) Remove the four screws L attaching the power amplifier
board. (See Fig.11)
H
cover power transformer
J
Fig.10
LL
1-12 (No.MB519)
Fig.11
3.1.8 Removing the display control board
(See Fig.12 to 14)
(1) Disconnect the connector wire connected to CN751
guitar and mic. jack board. (See Fig.12)
(2) Remove the four screws M attaching the display control
board. (See Fig.13)
(3) Disconnect the card wire connected to CN404
servo board. (See Fig.14)
from CD
from
CN751
Fig.12
M
Fig.13
CN404
Fig.14
(No.MB519)1-13
3.1.9 Removing the CD servo board
(See Fig.15 and 16)
(1) Remove the four screws N attaching the CD servo board.
(See Fig.15)
(2) Disconnect the connector wire connected to CN603 from
door switch board. (See Fig.15)
(3) Disconnect the connector wire connected to feed motor
board.
(4) Solder the short land section on the card wire of CD pickup.
(See Fig.16)
CAUTION:
• Solder the short land section on the card wire of CD
pickup before disconnecting the card wire from the
connector on the CD pickup. If the card wire is disconnected without attaching the solders, the pickup may
be destroyed by static electricity.
• When attaching the CD pickup, be sure to remove solders from the short land section after connecting the
card wire to the connector on the CD pickup.
(5) Disconnect the card wire connected to CN601
pickup.
from CD
CN603
N
Fig.15
1-14 (No.MB519)
short land section
Fig.16
3.1.10 Removing the traverse mechanism
(See Fig.17)
(1) Remove the four screws P attaching the traverse mecha-
nism.
3.1.11 Removing the guitar and mic. Jack board
(See Fig.18 and 19)
(1) Remove the two screws Q attaching the guitar and mic.
Jack board. (See Fig.18)
(2) Remove the one screw R attaching the guitar and mic. Jack
board. (See Fig.19)
PP
Fig.17
Q
Fig.18
R
Fig.19
(No.MB519)1-15
3.1.12 Removing the front cabinet
(See Fig.20 and 21)
(1) Remove the eights screws S (both side) attaching the
speaker cover. (See Fig.20)
(2) Remove the eight screws T (both side) attaching the
speaker. (See Fig.21)
S
left sideright side
S
Fig.20
T
1-16 (No.MB519)
T
Fig.21
3.1.13 Removing the key board
(See Fig.22 and 23)
(1) Take off the volume and super woofer volume knob.
(2) Remove the two nuts U attaching the main volume and su-
per woofer volume. (See Fig.22)
(3) Remove the eight screws V attaching the key board. (See
Fig.23)
U
Fig.22
V
Fig.23
V
(No.MB519)1-17
3.1.14 Removing the transmitter board
(See Fig.24 and 24)
(1) Remove the two screws W attaching the transmitter board.
(See Fig.24)
(2) Pull up the transmitter board with cable. (See Fig.24)
W
Bottom case
Fig.24
Fig.25
1-18 (No.MB519)
3.2 CD traverse mechanism section
• Remove the CD traverse mechanism assembly. (See "3.1.12 Removing the CD traverse mechanism assembly".)
3.2.1 Removing the CD pick
(See Figs.1 and 2)
(1) Remove the CD mechanism holders in the direction of the
arrow. (See Fig.1.)
(2) Remove the four screws A attaching the pick cover. (See
Fig.1.)
(3) Remove the insulators (brown and orange) from the CD
mechanism base assembly. (See Fig.2.)
(4) Remove the CD shaft from the CD mechanism base as-
sembly in the direction of the arrow 2 while moving the
shaft stopper in the direction of the arrow 1. (See Fig.2.)
(5) Remove the CD pick from the CD mechanism base assem-
bly.
3.2.2 Installing the CD pick
(See Figs.1 and 2)
(1) While installing the section a of the CD pick to the CD
mechanism base assembly, set the CD shaft to the section
b. (See Fig.2.)
(2) Install the insulators (brown and orange) to the CD mecha-
nism base assembly. (See Fig.2.)
(3) Attach the pick cover and CD mechanism holders. (See
Fig.1.)
CD mechanism holder
A
CD mechanism holder
Insulator (Brown)
b
Feed motor
B
Pick cover
Shaft stopper
1
A
Fig.1
Insulator (Brown)
CD shaft
2
a
CD mechanism base assembly
Insulator (Orange)
CD pick
Insulator (Orange)
Fig.2
(No.MB519)1-19
3.2.3 Removing the spindle motor and feed motor
r
(See Fig.2 to 4)
(1) Remove the two screws B attaching the feed motor. (See
Fig.2.)
(2) Remove the turn table in an upward direction and remove
the two screws C attaching the spindle motor. (See Fig.3.)
(3) From the bottom side of the CD mechanism base assem-
bly, remove the screw D attaching the spindle/feed motor
board. (See Fig.4.)
(4) Remove the solders from the sections (c, d) on the spindle/
feed motor board. (See Fig.4.)
3.2.4 Installing the spindle motor and feed motor
(See Figs.3 to 6)
(1) Tighten the two screws B and two screws C to the same
torque. (See Figs.2 and 3.)
(2) Fasten the spindle/feed motor board with the screw D.
(See Fig.4.)
(3) Solder the spindle and feed motors on the spindle/feed mo-
tor board as before. (See Fig.4.)
(4) Install the turn table. When installing, press straight down
at the center of the turn table until the distance from the surface of the CD mechanism base assembly to the top of the
turn table is exactly 19.4±0.1mm. (See Fig.5.)
(5) After insertion is complete, bond the motor shaft and turn
table together. (See Fig.6.)
(6) Use 'LOCKTITE' #460 bonding agent, and apply as little as
possible. Take care not to allow any excess bonding agent
to get onto the turn table. Be extremely careful not to allow
bonding agent to adhere to the motor bearings. (See
Fig.6.)
Spindle motor
CD mechanism base assembly
Spindle motor
c d
Spindle/feed motor board
Turn table
D
Fig.4
Feed moto
19.4
0.1mm
Turn table
Fig.3
C
Spindle motor
Fig.5
Turn table
'LOCKTITE' #460
Fig.6
1-20 (No.MB519)
3.3 Cassette mechanism section
r
• Remove the cassette mechanism assembly. (See "3.1.3 Removing the cassette mechanism assembly".)
3.3.1 Removing the head amplifier & mechanism control board
(See Fig.1)
(1) After turning over the cassette mechanism assembly, re-
move the three screws A attaching the head amplifier &
mechanism control board.
(2) Disconnect the flexible wire from the connector CN31
the head amplifier & mechanism control board.
(3) Disconnect the head amplifier & mechanism control board
from the connector CN1
the head amplifier & mechanism control board.
Reference:
Remove the solders from the section a to remove the parallel
wire soldered to the D.C. motor as required.
on the switch board and remove
Capstan Belt
on
D.C. motor
3.3.2 Removing the D.C. motor
(See Figs.1 to 4)
(1) From the bottom side of the cassette mechanism assem-
bly, remove the solders from the sections a. (See Fig.1.)
(2) From the top side of the cassette mechanism assembly, re-
move the two screws B attaching the D.C. motor. (See
Fig.1.)
(3) While raising the D.C. motor, remove the capstan belt from
the motor pulley. (See Fig.2)
Caution:
Be sure to handle the capstan belt so carefully that this belt will
not be stained by grease and other foreign matter. Moreover,
these belts should be hanged while referring to the capstan
belt hanging method. (See Figs.3 and 4.)
Switch board
A
CN1
Capstan belt
D.C. motor
a
Capstan Belt
Fly wheel (L)
Motor pulley
Fig.2
D.C. motor
Motor pulley
Fig.3
D.C. moto
CN31
Head amplifier &
mechanism control
board
Flexible wire
D.C. motor
A
Fig.1
Parallel wire
B
Capstan Belt Motor pulley
Fig.4
(No.MB519)1-21
3.3.3 Removing the flywheels
(See Figs.5 and 6)
• Remove the head amplifier & mechanism control board and
D.C. motor.
(1) After turning over the cassette mechanism assembly, re-
move the slit washers (b, c) fixing the capstan shafts R and
L.
(2) Pull out the flywheel(R) and flywheel(L) respectively from
the bottom side of the cassette mechanism assembly.
Flywheel (L)
Capstan shaft L Capstan shaft R
Flywheel (R)
3.3.4 Removing the DC solenoid and switch board
(See Fig.7)
• Remove the head amplifier & mechanism control board and
D.C. motor.
(1) Remove the screw C attaching the switch board.
(2) Remove the pawls (d, e, f, g and h) attaching the switch
board.
(3) From the top side of the cassette mechanism assembly, re-
move the pawls (i, j) attaching the DC solenoid.
DC
solenoid
Slit
washer b
Fig.5
Flywheel (L) Flywheel (R)
Fig.6
d
e
j
i
f
Slit
washer c
g
C
1-22 (No.MB519)
h
Switch boardDC solenoid
Fig.7
3.3.5 Removing the playback/recording head
(See Figs.8, 9, 12)
(1) While shifting the trigger arms seen on the right side of the
head mount assembly in the direction of the arrow, turn the
flywheel (L) in counterclockwise direction until the head
mount assembly has gone out with a click. (See Figs.8 and
9.)
(2) When the flywheel (L) is rotated in counterclockwise direc-
tion from the position in Fig.9 to that in Fig.12.
(3) At this position, disconnect the flexible wire (outgoing from
the playback/recording head) from the connector CN31
the head amplifier & mechanism control board. (See
Fig.12.)
(4) Remove the flexible wire from the section k. (See Fig.12.)
(5) Remove the spring from the bottom side of the playback/re-
cording head. (See Fig.12.)
(6) Loosen the reversing azimuth screw attaching the play-
back/recording head. (See Fig.12.)
(7) Take out the playback/recording head from the front side of
the head mount assembly.
Cassette mechanism assembly
on
Trigger arm
Head mount assembly
Flywheel (L)
Fig.8
Playback/recording head
Flexible wire
Head amplifier & mechanism control board
Fig.9
Trigger arm
Flywheel (L)
(No.MB519)1-23
3.3.6 Reassembling the playback/recording head
r
(See Figs.10 to 12)
(1) Reassemble the head mount.
a) To become direction of the left side, direction lever of
the head mount assembly is maintained by the hand.
(See Fig.11.)
b) Reassemble the playback/recording head from the
front of the head mount assembly to the position as
shown Fig.10, Fig11, and Fig.12. (m', n', p' and q', r'
are set to the hole of n and p and ditches of m, q and
r and thrusting out the head mount assembly is built
in.
(2) Fix the reversing azimuth screw. (See Fig.12.)
(3) Set the spring from the bottom side of the playback/record-
ing head. (See Fig.12.)
(4) Attach the flexible wire to the section k of the chassis base
assembly. (See Fig.12.)
m'
n'
p'
q'
r'
Detection leve
Fig.10
Head mount
Assembly
p
Playback/recording head
Spring
Flexible
wire
m
n
q
r
Fig.11
Reversing azimuth screw
Head mount assembly
1-24 (No.MB519)
k
Chassis base assembly
CN31
Head amplifier & mechanism control board
Fig.12
3.3.7 Reassembling the Control Cam
(See Figs.13 to 15)
The head assembly is adjusted in the direction of the left side (direction of the forward), and it inserts according to the part of the
hole s of the control cam and the section s' of the chassis base
assembly.
s (hole)
Control cam
s'
Chassis base assembly
Fig.13
Chassis base assembly
s'
s (hole)
Fig.14
Control cam (Surface)
Fig.15
(No.MB519)1-25
SECTION 4
ADJUSTMENT
4.1 Connection of adjustment
4.1.1 Connection of cassette deck and circuit board check
Key board
Super woofer volume Main volume
Woofer volume encoder board
*Remove the key, volume encoder and woofer volume encoder boards from the front cabinet assembly
and connect them to the display control board.
Display control board
Volume encoder board
4.1.2 Connection of CD mechanism assembly check
Extension cable
Extension cable
CD mechanism assembly
1-26 (No.MB519)
4.2 Adjustment of cassette mechanism section
4.2.1 Arrangement of adjusting points
Azimuth adjust screws
4.2.2 Electrical performance
Items
Adjustment of
recording bias
current
Measurement
conditions
*Mode :
Forward or reverse
mode
(Reference
value)
*Recording mode
*Test tape :
AC-514 and AC-225
Measurement output
terminal :
Both recording and
headphone terminals
Adjustment of
recording and
playback
Reference frequency :
1kHz and 10kHz
(REF:-20dB)
frequency
characteristics
Test tape :
TYPE AC-514
Measurement input
terminal : OSC IN
VR32
VR31
Adjustment of tape speed
Head amplifier & mechanism control board
Measurement method
1. With the recording and playback mechanism,
load the test tapes(AC-514 to TYPE and AC-225
to TYPE ),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 VR31 for Lch and VR32 for Rch
so that the recording bias current values become
4.0 A (TYPE ) and 4.20 A(TYPE ).
1. With the recording and playback mechanism, load
the test tape(AC-514 to TYPE ),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
TYPE ,adjust VR31 for LcH and VR32 for RcH so
that the output deviation between 1kHz and 10kHz
becomes -1dB 2dB.
VR37
Standard
values
AC-225
:4.20 A
AC-514
:4.0 A
Output
deviation
between
1kHz and
10kH
:-1dB 2dB
Adjusting
positions
LcH
:VR31
RcH
:VR32
LcH
:VR31
RcH
:VR32
(No.MB519)1-27
4.2.3 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 :
TYPE AC-514
*Measurement
terminal :
BIAS TP on circuit
board
*Recording and
playback side forward
or reverse
*Recording mode
*Test tape :
AC-514 and AC-225
Measurement
terminal :
Both of the eraser
head
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-514 to TYPE ), and set the
mechanism to the recording and pausing conditions
in advance.
3. Confirm that the BIAS TP frequency on the circuit
board is 100kHz 6kHz.
1. With the recording and playback mechanism, load
the test tapes (AC-514 to TYPE and AC-225 to
TYPE ), 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.
Standard
values
100kHz
6kHz
TYPE
:120mA
TYPE
:75mA
Adjusting
positions
4.2.4 Tape recorder section
Items
Confirmation
of head angle
Measurement
conditions
Test tape :
TMT7036 (10kHz)
1. Playback the test tape TMT7036 (10kHz).
2. With the playback mechanism or recording &
playback mechanism, adjust the head azimuth
Measurement
output terminal :
Speaker terminal
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
Confirmation
of tape speed
Speaker R :
headphone terminal
Test tape :
VT712 (3kHz) or
TMT7036 (3kHz)
performed in both the forward and reverse
directions with the head azimuth screw.
<Constant speed>
Adjust VR37 so that the frequency counter reading
becomes 3,010Hz 15Hz when playing back the
test tape VT712 (3kHz) with the playback
Measurement
output terminal :
mechanism or playback and recording mechanism
after ending forward winding of the tape.
Headphone terminal
4.2.5 Reference values for confirmation items
Items
Wow & flutter
Measurement
conditions
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).
Measurement method
Measurement method
Standard
values
Maximum
output
Tape speed
of decks
: 3,010Hz
15Hz
Standard
values
0.25% or
less
(WRMS)
Adjusting
positions
Adjust the
head
azimuth
screw only
when the
head has
been
changed.
VR37
Adjusting
positions
Both the
playback
and
recording
& playback
mechanism
1-28 (No.MB519)
SECTION 5
TROUBLE SHOOTING
5.1 Maintenance of laser pickup (CD)
(1) Cleaning the pick up lens
Before you replace the pick up, please try to clean the lens
with a alcohol soaked cotton swab.
(2) Life of the laser diode
When the life of the laser diode has expired, the following
symptoms will appear.
• The level of RF output (EFM output : ampli tude of eye
pattern) will below.
Is the level of
RFOUT under
1.25V 0.22Vp-p?
YES
O.K
(3) Semi-fixed resistor on the APC PC board
The semi-fixed resistor on the APC printed circuit board
which is attached to the pickup is used to adjust the laser
power. Since this adjustment should be performed to
match the characteristics of the whole optical block, do not
touch the semi-fixed resistor.
If the laser power is lower than the specified value, the laser diode is almost worn out, and the laser pickup should
be replaced.
If the semi-fixed resistor is adjusted while the pickup is
functioning normally, the laser pickup may be damaged
due to excessive current.
NO
Replace it.
5.2 Replacement of laser pickup (CD)
Turn off the power switch and, disconnect the
power cord from the ac outlet.
Replace the pickup with a normal one.(Refer
to "Pickup Removal" on the previous page)
Plug the power cord in, and turn the power on.
At this time, check that the laser emits for
about 3seconds and the objective lens moves
up and down.
Note: Do not observe the laser beam directly.
Play a disc.
Check the eye-pattern at TP1.
Finish.
(No.MB519)1-29
Victor Company of Japan, Limited
Audio/Video Systems Category 10-1,1chome,Ohwatari-machi,Maebashi-city,371-8543,Japan
(No.MB519)
Printed in Japan
VPT
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