JVC RC-W410 User manual

RC-W410 wesaavvvx
JVC
ERVICE MANUAL
Area suffix
Bikes Shieh oad ek hak & UK
a ae eer Continental Europe
Gee RN a A eR as a W. Germany
Glo yelaleiss G28 AE sok die Italy
VINX: st ee Eastern Europe
Contents
Page
[1] Safety Precautions........... 0.0000 eee eee 2 (9! Wiring Connections .....-......0.00 00000005 15
1D) “Features: uci bed an goa eae ke be 4 10, Standard Schematic Diagram ................ 16
(3) Specifications ....... 0.000.000 eee eee 4 (11) Location of P.C. Board and Parts List .......... 18
[4] Names of Control and Their Functions. ......--- 5 12] Exploded View of Enclosure Assembly .........-- 25
{5] Location of Main Parts ...........0+00000 00 6 13) Exploded View of Mechanism Assembly ....... - 27
(6! Removal of Main Parts...........-0000 000005 8 14) Packing Illustration and Parts List ............. 30
(7) Main Adjustment ........0....0.20222 0000s 10 (5| Accessories... 0.0.0.0 ee eee 31
8] Block Diagrams. 342-40 cae eet ee RE 14
No. 1768
February 1989

RC-W410
sevcavvvx
|
'1| Safety Precautions
1.
OhWNH
Warning
.
This
equipment
has
been
designed
and
manufactured
to
meet
international
safety
standards.
.
It
is
the
legal
responsibility
of
the
repairer
to
ensure
that
thése
safety
standards
are
maintained.
.
Repairs
must
be
made
in
accordance
with
the
relevant
safety
standards.
.
It
is
essential
that
safety
critical
components
are
replaced
by
approved
parts.
.
If
mains
voltage
selector
is
provided,
check
setting
for
local
voltage.
The 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.
Service
should
be
per-
formed by qualified personnel only.
.
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
manufacturer’s
warranty
and
will
further
relieve
the
manufacturer
of
responsibility
for
personal
injury
or
property
damage
resulting
therefrom.
.
Many
electrical
and
mechanical
parts
in
the
product
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
(
A\)
on
the
Schematic
Diagram
and
Parts
List
in
the
Service
Manual.
The
use
of
a
substitute
replacement
which
does
not
have
the
same
safety
characteristics
as
the
recommended
replacement
part
shown
in
the
Parts
List
of
Service
Manual
may
create
shock,
fire,
or
other
hazards.
.
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.
. Leakage current check (Electrical shock hazard testing)
After
re-assembling
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.
e
Piug
the
AC
line
cord
directly
into
the
AC
outlet.
Using
a
Leakage
Current
Tester’,
measure
the
leakage
current
from
each
exposed
metal
part
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
0.5
mA
AC
(r.ms.).
e Alternate check method
Plug
the
AC
line
cord
directly
into
the
AC
outlet.
Use
an
AC
voltmeter
having
1,000
ohms
per
volt
or
more
sensi-
tivity
in
the
following
manner.
Connect-a
1,500
2
10
W
resistor
paralleled
by
a
0.15
uF
AC-type
capacitor
be-
tween an exposed metal part and a known good earth ground.
Measure
the
AC
voltage
across
the
resistor
with
the
~
AC
VOLTMETER
AC
voltmeter.
i
(Having
1000
ohms/volt,
:
F
or
more
sensitivity.)
Move
the
resistor
connection
to
each
exposed
metal
part,
particularly
any
exposed
metal
part
having
a
SS
ee
AP
return
path
to
the
chassis,
and
measure
the
AC
volt-
Out
Sah
GT
PE
age
across
the
resistor.
Now,
reverse
the
plug
in
the
biageahiepiewe
AC
outlet
and
repeat
each
measurement.
Any
voltage
on
each
exposed
measured
must
not
exceed
0.75
V
AC
(r.m.s.).
This
15009
10W
metal
part.
corresponds
to
0.5
mA
AC
(r.m.s.).
4h —--
Good earth ground
2 (No. 1768)

RC-W410 B/E/G/GI/V/VX
| SAFETY PRECAUTIONS ABOUT RC-W410 |
1. Since diodes D901, D902, D903 and D904 are heating
units, wires are arranged not to touch them as shown in
Fig. 1-1 ©.
Confirm that those parts are set vertically.
Power Supply Board
2. Check up wires connected to the power transformer,
which must be bound together with as shown in Fig. 1-1
O.
4PIN Connector to
Power Amplifier Board
3. Check up that single wires coming from a P.C. board are
bound together with at the collective root near the board
as shown in Fig, 1-1 Q).
Power Trans
4. Check up that all wires of motors and leaf switches are
bound and secured with spacers at specific points respec-
tively. (See Fig. 1-2 @ and ©)
Mechanism
Fig. 1-2
5. Make sure of speaker wires which should be soldered as
they are twisted with each other as shown in Fig. 1-3 ©. Speaker
00
(ey
6 FT 6
Fig. 1-3
(No. 1768) 3

RC-W410 B/E/G/GI/V/VX |
[2] Features
Hyper-Bass Sound System with 3D on/off switch
Three-band (FM/MW/LW) synthesizer tuner with Five-stations in each band
(FM1, FM2, MW and LW) preset capability
4-element S.E.A. graphic equalizer
Full auto-stop mechanism
Synchro-start high-speed dubbing
Relay play between two decks
'3] Specifications
Tuner section
Frequency rranges : FM 87.5—108 MHz
MW 522-1629 kHz
LW 144-290 kHz
Antennas : Telescopic antenna for FM
Ferrite core antenna for MW & LW
Tape Recorder section
Track system : 4-track 2-channel stereo
Frequency response : 80—12,500 Hz
Wow & flutter : 0.15 % (WRMS)
Fast wind time : Approx. 120 sec (C-60 cassette)
General
3D system : ASW (Acoustic Super Woofer)
Speakers : 10cm x 2
Power output : 7.0 W (3.5 W + 3.5 W) at 8 Q and
8.0 W for 3D at 12 22 (Max.)
4.0 W (2.0 W + 2.0 W) at 8 Q and
6.0 W for 3D at 12 2 (10% THD)
S.E.A. characteristics
S.E.A. center frequencies : 100 Hz/330 Hz/2 kHz/10 kHz
S.E.A. control range :£8 dB
Input jack : MIX MIC x 1 (3 mV/—50 dBV,
200 2 — 2 kQ)
Output jack : Headphones x 1 (20 mW/32 Q,
8Q—1kQ)
Power supply :DC 12 V (8 “R20” cells)
AC 220—240 V/110—120 V,
50/60 Hz
(RC-W410E only) Ext. DC IN 12 V (car battery via
optional CN-332 car adapter)
Power consumption : 18 W
Dimensions : 560(W) x 167(H) x 153(D) mm
(including knobs)
Weight : Approx. 3.9 kg (without batteries)
Design and specifications are subject to change without notice.
4 (No. 1768)

| RC-W410 B/E/G/GI/V/VX
4) Names of Controls and Their Functions
1 bo © Gg OGOdG
Z a, __| Pe | h
y / am Cen en Ta EY NN
we [jee Wr
Ic 51 Farce
rae
Cp tr tt Jit
eee
SISO Rare,
CMR OL
WOO
RESO
estes KK
Seeeeees
Fig. 4-2
@ Cassette operation buttons (Deck A) @ LCD digital display
@/4 STOP/EJECT button Band indicator (FM1-FM2-MW-LW)
44 FF button Radio frequency display
PP REW button Preset station indicator
“4 PLAY button FM stereo (STEREO) indicator
@ Cassette operation buttons (Deck B) @ BAND button
§8 PAUSE button ® TUNING control
@/& STOP/EJECT button ¥ DOWN frequency
44 FF button A UP frequency
PP REW button g Cassette holder (Deck B)
“@ PLAY button PHONES jack (3.5 mm dia. stereo mini)
OREC button @ MIX MIC jack (3.5 mm dia. mini)
8 TAPE/FM MODE switch @ Telescopic antenna
FUNCTION switch @ BEAT CUT switch
@ 3D (HYPER-BASS SOUND) switch @ VOLTAGE SELECTOR/AC IN (AC input) jack
@ 4-BAND GRAPHIC EQUALIZER (S.E.A.) controls @ DC IN 12 V jack (©-2-@ ) (RC-W410E only)
g VOLUME control @ Battery compartment cover
Preset station button
° PRESET SCAN button
Cassette holder (Deck A)
(No. 1768) 5

RC-W410 B/E/G/GI/V/VX |
[5| Location of Main Parts
Amplifier Board Tuner Board
Power Amplifier Mechnism Ass’y ‘Speaker
Board
Fig. 5-1
Battery Contact Board Rod Antenna
GHEE TAT
PELL
Battery Contact Board Bilt in Subwoofer
IRedmSide
AC Socket Power Supply Board Power Transformer
Fig. 5-2
6 (No. 1768)

@ Mechanism Ass’y
PB HEAD
Bottom View
[A] Mecha Button
FF PLAY
STOP/
EJECT | REW
Reel Disk Ass'y
Motor Ass’y
Fig. 5-3
RC-W410 B/E/G/GI/V/VX
[B} Mecha Button
STOP/ REW REC
EJECT
R/P HEAD
Reel Disk Ass‘y
RF Cam Gear
Flywheel Ass’y
Fig. 5-4
RF Cam Gear
Flywheel Ass'y
(No. 1768) 7

RC-W410 B/E/G/GI/V/VX © |
6) Removal of Main Parts
Rear Cabinet Ass’y
‘
Remove
six
screws
(1)
(M3
x
20)
and
@)
(M3
x
44)
which
secure
the
rear
cabinet
ass’y
at
the
points
indicated
by
A
marks.
2.
In
the
course
of
detaching
the
rear
cabinet
ass’y,
dis-
connect
the
antenna
lead
which
is
wired
to
the
tuner
board
from
TP1.
3.
Disconnect
a
connector
CN901
from
the
power
amplifier
board,
M3x 20
Fig. 6-1
B® Speaker Unit for Hyper-Bass Sound
1. Release the wire between the battery contact board and
the
power
supply
board
from
the
guide
for
wire
arrange-
ment.
2, Release the wire from three wire clamps located by the
right speaker.
3. Remove five screws ) (M3 x 16) and six screws @ (m3
x
16)
securing
the
hyper-bass
sound
box.
Therefore,
the
speaker unit can be seen.
4. By removing eight screws ® (M3 x 16) from the hyper-
bass
sound
box,
the
speaker
unit
can
be
taken
offm3
x
16
Guide for wire
arrangement (3) M3 x 16
Fig. 6-2b AB
8 (No. 1768)

=
Tuner Board
Draw out the tuner board along the groove of the front
cabinet ass’y.
Main Board and Power Amplifier Board
. Remove three knobs of the slide switches: TAPE/FM
MODE, FUNCTION and 3D selectors.
. Release the wire from three wire clamps located by the
right speaker.
. Remove adhesive tape securing the wire to the main
board.
. Remove two screws © (M3 x 45) and ® (M3 x 45,
black) securing the main board and power amplifier.
. Detach the PHONES jack first, then the volume control
and SEA switch, etc. one after another, and lastly take
off the boards.
. Disconnect connectors CN103, CN902, CN101, CN102
and CN401 from the Main board.
Mechanism Ass’y
. Remove the tuner board and amplifier board.
. Remove nine screws (M3 x 10) and @) (M3 x 25)
securing the mechanism ass’y.
. Draw out the Rec. lever.
Operation Buttons
Remove ten screws (M2 x 4) securing operation
buttons to the mechanism.
Synthesizer/LCD Board
Remove two screws @ (M3 x 8) securing the Synthesizer/
LCD board.
Power Transformer and Power Supply Board (Fig. 6-2b)
. Remove three screws ® retaining the power transformer
and power supply board.
. Remove two screws from transformer bracket.
(When re-assembling, make sure of the correct direction
to set the transformer bracket.)
RC-W410. secon
M3x25 M3x10
(No. 1768) 9

RC-W410 secon |
Main Adjustments
(1) Equipment and Measuring Instrument used for Adjustments
e Electronic voltmeter e Wow-flutter meter e Torque testing cassette gauge CTG-N
e
Audio
frequency
oscillator
e
Frequency
counter
e
Alignment
tape
e Attenuator e Standard signal generator e Measuring tape : TS-8 (UR)
(2) Function of Cassette
® Condition for Measurement
Power
supply
......
AC
220—240
V/110—120
V
(50/60
Hz)
Function
position
..TAPE/FM
MODE:
TAPE
NORMAL
DC12V
FUNCTION
:
NORMAL
SPEED
Reference
output
...
Speaker
:
OdBs
(0.775
V)/8
2
SEA
:
Center
Headphone
:
—13 dBs
(0.173
V)/32
Q
3D
:
OFF
3D
2120
BEAT
CUT
>:
NORMAL
Reference
Input
.... Ext.MIC
:
—46dBs
e
Routine
of
Check
and
Adjustment
No.
Item
bi
aay
Check and
Adjustment
Adjusting
Point
1
|
Tape
speed
and
VTT712
Play
back
the
end
portion
of
the
VTT712
test
tape
and
check
Wow-fiutter
(3 kHz)
up
the following standards.
check -
adjustment
e
B Deck
:
at
Normal
speed
3000
Hz +
30 Hz
VR331
at
Normal speed
Less
than 0.38%
(JIS
UNWTD)
Check
e
A
Deck
:
at
Normal speed
+80 Hz
against
B
Deck
Check
at
Normal
speed
Less
than
0.38%
(JIS
UNWTD)
Check
C
2
|
High-speed
and
VTT712
1)
Loading
VTT712
on
A
Deck
and
Blank
tape
TS-8(UR)
on
B
Synchro
dubbing
|
(3 kHz)
deck.
check
TS-8
(UR)
2)
Function
position :
HIGH SPEED
3) B Deck : REC/PAUSE
4) B Deck pause to be released when playing A Deck, then start
High-speed dubbing.
5) High speed : Within 5600 Hz + 400 Hz to be check Check
3 VTT703L 1) Play back VTT703L, both A and B Deck.
Head azimuth Left side screw
adjustment (10 kHz) 2) Obtain maximum Playback output for this adjustment. of PB or R/P
3) Phase difference to be minimized. head
4) Screw lock to be applied after adjustment.
4
|
Playback
out-
VTT724
Play
back
the
VTT724
tape
on
B
Deck
and
confirm
that
level
Check
put level (1 kHz) difference between R and L channels is within 4 dB.
check (Measuring point : Headphone output)
5 | Playback VTT736 1) Play back VTT736 difference level against 1 kHz.
frequency (1kHz/125Hz, A Deck, BDeck..... Measuring point : Headphone output Check
characteristics 1kHz/8 kHz) 1kHz/125 Hz: O0dB+4dB
1kHz/8kHz : 1dB+4dB
2) Tape mode switched to Metal/CrO,
Play back VTT736 and check the difference between 1 kHz
and 8 kHz at Headphone output.
B Deck : within —1 dB +3 dB Check _|
6 | Bias frequency 1) B Deck : REC mode, Beat Cut : Position 1
2) Leakage of Bias at Headphone to be checked with frequency
counter.
72 kHz + 3 kHz to be adjusted with L321 L321
3) Bias frequency to be checked for beat cut position 2 and
position 3.
Position 2 : 70 kHz +3 kHz
Position 3 : 68 kHz + 3 kHz
7
|
Rec/Playback
TS-8
(UR)
Reference
signal
—20
dB
to
be
applied
to
Mic,
and
difference
frequency
level
between
125
Hz
and
8
kHz
against
1
kHz
to
be
checked.
characteristics
1kHz/125
Hz:
—2dB+4dB
Check
1kHz/8kHz
:
+2
dB*§
dB
—_______+
8
|
Maximum
output
|
VTT722
Play
back
VTT722.
Measuring
point
:
Headphone
output
&
Output
more
than
28
mW
(0.95
V)
at
SEA
max.
_|_
Check
10 (No. 1768)