JVC TD-W717TN User manual

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TD-W718BKa ee/en/c/uut
JVC
SERVICE MANUAL
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Safety
Precautions
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Page2
6.Standard
Schematic
Diagrams:
---+++-++++++++:
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25
Wl Features/Specifications «::++++++1sssretteet eee 4 7.Location of P.C.Board parts
| Instructions scorrtrrrr erect eet e eter e cent ee eees 5 and Parts List: *::cctreet rete - 30
1.Location of Main Parts ss:s+++ssresr tess seeeee 12 8.Exploded View of Enclosure Component Parts
2.Removal of Main Parts Pome ereeeereresenecesorses 13 and Parts List eee eee ee . 40
3.Main Adjustment ssrsrsr sce e seers ects e res eerees 18 9.Exploded View of Mechanism Component Parts
4.Wiring Connections sorts s erste teres 23 and Parts List ::cccss ctr secrete: - 42
5.Block Diagram errr rere rer ee ee eee ee eee ee ee eee 24 10.Packing Itlusration and Parts List --:--°"°°"*: - 43
No. 4358
June 1995

TD-W717TNev
TD-W718BKa/evevenscrusut
i
Safety
Precautios
1. The design 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 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 manufacture’s 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 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 shading and( A Jon the schematic
diagram and by ( A ) 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 part 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 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.
* Plug 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, particulary any exposed metal part having a return path to the chassis, to a known good earth ground.
Any leakage current must not exposeed 0.5mA AC(r.m.s.) AC VOLTMETER
* Alternate check method an (Having 1000 ohms/volt,
or more sensitivity.)
Plug the AC line cord directly into the AC outlet. Use an AC
voltmeter having 1,000 ohms per volt or more sensitivity in the
following manner. Connect a 1,500 ohms 10W resistor paralleled by
a0.15
«2
F
AC
type
capacitor
between
an
exposed
metal
part
and
|
Place
this
probe
on
each
exposed
a
known good
earth
ground.
Measure
the
AC
voltage
across
the
15002
10W
metal
part.
resistor with the AC voltmeter. Move the resistor connection to each Good éarthground
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. Any voltage measured must not exceed 0.75V
AC(r.m.s.).This corresponds to 0.5mA AC(r.m.s.).
@ Warning (UK only)
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 maintaintained.
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 loca! voltage.
2 (No. 4358)

TD-W717TNes
TD-W718BKaeerenauut
@ Important Management Points Regading Safety
(Items Demanding Special Safety Precautions)
—-—U/UT Version—---—
1.Securely fix the power transformer while confirming its 7. Since the following parts are hear generation ones,
marking specified in the following. they must no contact with electolytic capacitors, wires,
C[wiesaas-o2tF| | T-w7i7|
rvarerive] WTPS225-021F| | TD-w718 |
V a
etc.
@ Following parts are inflammables,Make sure of their lift
— up condition for the purpose.
@ Parts in box [J must be controlled.
U/UT |WTP5265-021 R901, R902, R921, R923, [R937], R938, R940, RI41, R755,
2.Power cord : Make sure of the following markings and R1403, R2403. R1453. R2453. R8432. R8482. RB441
inspect exterior scratch anddamage. [R8444], R8491, R8494, Q901, [903 |, a905, Q909, A912,
Q915 |, Q8431, Q8481, D901, D902, D903, D904, D909,
| __- |Power cord| Attachment plug D910, C914, R945
SPT-1 KP-10W or SU-1P
SPT-1 KP-10W or SU-1P
A
Other parts
C903 C904 3300uF/25V C/J virsion (VENT TYPE)
8. All fuses must securely be connected.|n
A/B/E/EN/G/U/UT version, F901 and F902 musi be
specified by the rating of 800 mA shown on the surlace
PB [eisec aseson | —_KP-610 3A
[A [LTSA-2F
3. Install the cord bushing by the specified tool
E/EN/G| (VDED KP-419C or SE-1
q
as well as by themarking of © or in U/UT version, F903
while
confirming
the
marking.
Bushing
:
NIFCO
2271
MUSE
DS
speciiod
Dye
Fauna
el
ole
Mn
sown
Oete
4, Wiring terminal surface well as by the marking ©or @.
a)When installing the power cord,wind it around the
terminal by the end before soldering.
b)Arrange the wires while binding them nearby the
terminal.
c)The end of respective power cords is solderedin the
air and the space from others must be3.2 mm or more
in the distance.
(NO. 4368) 3

(8SEP7 ON) PF
INSTRUCTIONS
TD-W7SD/W717/W718 0.
DOUBLE CASSETTE DECK
CORD Peg "4
cr WF BASEN
Component
—
TD-W7SD
For Customer Use:
Enter betow the Model No. and Seriat
No. which are located on the rear of the
cabinet. Retain this information for
future reference.
Model No.
Serial No.
TROUBLESHOOTING
What appears to be trouble Is not always real trouble. Make
sure first...
1. Cassette cannot be loaded.
@ Is the cassette positioned correctly?
2. When PLAY button is pressed, tape does not move.
@ ls the tape too loosely wound?
3. Tape runs, but no sound Is heard.
® Are ali connections properly and securely made?
@ Is the MONITOR switch of the stereo amplitier set to the
TAPE position?
@ Is the VOLUME contro! of the stereo amplifier set to MIN?
4. Sound quality is poor.
@ Is the DOLBY NR switch set to the right position?
@ Is the head section dirty?
® Is the record/playback head magnetized?
@ Is the tape worn out?
SPECIFICATIONS
Type : Double cassette deck
Track system 1 4-track, 2-channel
Tape speed : 4.8 cm/sec (1-7/8 inch/sec) (Normal)
9.5 cm/sec (3-3/4 inch/sec) (High)
Frequency
response :(-20 dB recording)
(TD-W7SD) _: Type IV tape ; 10 - 20,000 Hz
20 - 19,000 Hz (+3dB)
Type Ii tape ; 10 - 19,000 Hz
20 - 17,000 Hz (+3dB)
Type ttape ; 10- 19,000 Hz
20 - 17,000 Hz (+3dB)
{TD-W717/718) : Type iV tape ; 20 - 17,000 Hz
30 - 16,000 Hz (+3dB)
Type Ii tape ; 20 - 16,000 Hz
30 - 15,000 Hz (+3dB)
Type I tape ; 20 - 16,000 Hz
30 - 15,000 Hz (+3dB)
: $8 dB (S = 315 Hz, k3 = 3%, N=
A-weighted, Type IV tape)
The S/N is improved by about 15 dB at
§00 Hz and by max. 20 dB at 1 kHz -
10 kHz with Dolby C NR on and improved
by 5 dB at 1 kHz and by 10 dB at above
5 kHz with DOLBY B NR on.
S/N ratio
improvement
of MOL : 4 dB at 10 kHz with Dolby C NR on.
Wow and flutter : 0.08% (WRMS), +0.2% (DIN/IEC)
Channel
separation : 40 dB (1 kHz)
Crosstalk :60 dB (1 kHz)
Harmonic
distortion
(TD-W7SD) —_:k3; 0.5% (Type IV tape, 315 Hz, 0 VU)
(TD-W717/718) :k3; 0.8% (Type IV tape, 315 Hz, 0 VU)
Design and specifications are subject to change without notice.
5. Recording cannot be performed.
© Are the safety tabs of cassette tape broken?
@ Are all connections properly and securely made?
® Is the head section dirty?
6. Previous recording is not completely erased.
® Is the erase head dirty?
7. Since tape speed is irregular, wow and flutter occur.
@ Is the pinch roller or capstan dirty?
® ts the tape rewound too tight?
8. MUSIC SCAN operation does not function property.
® Are the non-recorded sections too short (3 sec. or less),
or do they contain high level noise or hum?
9. The BLANK SKIP indicator Is lit yet the BLANK SKIP opera-
tion does not function properly.
@ is the other deck operating MUSIC SCAN?
BLANK SKIP operation begins after MUSIC SCAN has fin-
ished.
Heads
(TD-W7SD) =: AMORPHOUS head for record/
playback, 2-gap ferrite head for erasure;
combination head x 1
(For both decks A and B)
(TD-W717/718) : METAPERM head for record/
playback, 2-gap ferrite head for erasure;
combination head x 1
(For both decks A and B)
Motors : Electric governed DC motor tor capstan x 1
DC motor for reel x 1
DC motor for mechanism drive x 1
{For both decks A and B)
Fast forward/
rewind time : Approx. 110 sec. with C-60 cassette
Input terminals
LINE IN
{x1 circuit) : Input sensitivity; 80 mV (0 VU)
Input impedance; 50 kQ
MiC x1
(Monaural) __: Input sensitivity; 0.4m V (-68dBV)
Matching impedance; 600 - 10 kQ
Output terminals
LINE OUT
(x 1 circuit): Output level; 300 mV (0 VU)
Output impedance; 5 kQ
PHONES x 1 : Output level; 0 - 1 mW/8 Q (0 Vu)
Matching impedance 8 0 - 1 kQ
Other terminals : COMPU LINK-3/SYNCHRO x 2
Power
requirement : AC 240 V, 50 Hz (Australia)
AC 230 V, 50 Hz (U.K.)
AC 120 V, 60 Hz (U.S.A)
Power
consumption ; With power switch on 23 W
With power switch standby 4.0 W
Dimensions
(Wx Hx D) 2435 x 134 x 331 mm
(17-3/16" x 5-5/16" x 13-1/16")
Weight : 4.9 kg (10.9 Ibs.)
Accessories : Pin plug cord
Remote cable ...
SUONOMISU] my
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CAUTION
aPAN
CAUTION "TO REDUCE THE RISK OF ELECTRIC SHOCK
DO NOT REMOVE COVER (OR BACK)
NO USER SERVICEABLE PARTS INSIDE
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.”
The lightning flash with arrowhead symbol, within
an equilateral triangle, is intended to alert the user
to the presence of uninsulated "dangerous voltage”
within the product's enclosure that may be of
sufticlent magnitude to constitute a risk of electric
shock to persons.
The exctamation point within an equilateral triangle
ts Intended to alert the user to the presence of
important operating and maintenance (servicing)
instructions tn the literature accompanying the
appliance.
WARNING:
TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK,
DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOIS-
TURE.
IMPORTANT (In the United Kingdom)
Mains Supply (AC 230 V ~, 50 Hz only)
DO NOT cut off the mains plug from this equipment. If the
plug fitted is not suitable for the power points in your
home or the cable is too short to reach a power point,
then obtain an appropriate safety approved extension
lead or consult your dealer.
BE SURE to replace the fuse only with an identical
approved type, as originally fitted and to replace the fuse
cover.
If nonetheless the mains plug is cut off ensure to remove
the fuse and dispose of the plug immediately, to avoid a
possible shock hazard by inadvertent connection to the
mains supply.
DO NOT make any connection to the terminal which is
marked with the letter E or by the safety earth symbol or
coloured green or green-and-yellow.
The wires in the mains lead on this product are coloured
In accordance with the following code:
Brown toL
(Live) or Red
As these colours may not correspond with the coloured
markings identifying the terminals in your plug proceed
as follows:
The wire which is coloured blue must be connected to the
terminal which is marked with the letter N or coloured
black.
The wire which is coloured brown must be connected to
the termina! which is marked with the letter L or coloured
red.
IF IN DOUBT-CONSULT A COMPETENT ELECTRICIAN.
Blue to N
(Neutral) or Black
Please study this instruction manual carefully before
starting to operate the unit, in order to use the unit cor-
rectly. We take no responsibility for any problems result-
ing from misuse of this unit by operating this equipment
other than instructed in this manual.
WARNING (In the United Kingdom)
Pre-recorded tapes, records or discs should not be
re-recorded without the consent of the owners of copy-
right in the sound recording and in any copyright musical
or literary work embodied in that recording as this consti-
tutes an infringement of copyright.
INFORMATION (FOR U.S.A.)
INTRODUCTION
Thank you for purchasing a JVC product. Read this instruction
book carefully before operating to be sure of getting optimum
performance and longer service life from the unit.
CONTENTS
Features
Auto reverse operation .
Cautions
Connections .
Cassette loading .
Names of parts and their functions
NOM RANNN
Playback ...
Recording .
Compu link control system 1
Dubbing 12
Maintenanc
Troubleshooting
Specifications ..
FEATURES
1. Fine amorphous recording/playback heads (TD-W7SD)
2. Double auto-reverse mechanism for recording/playback in
deck A and deck 8
3. COMPU CAL function which automatically sets the ftat
characteristics and brings out maximum tape performance
on both decks.
Full logic mechanism
Dolby* HX PRO headroom extension
Dolby B & C noise reduction system
@ Built-in MPX fitter
e end linked with the Dolby NR ON/OFF function (TD-
7. DDRP (Dynamics Detection Recording Processor} compati-
bility
The DDAP function is possible only when used with a suit-
able JVC CD player.
8. 2-color FL peak level indicator
9. 4-digit IInear tape counter respectively for deck A and deck
B
10. Synchro start (normal-/high-speed) dubbing
11. Auto tape select mechanism (decks A and B)
12. Multi music scan mechanism for either direction
13, Blank skip function
14. PITCH control (deck A)
15. Microphone mixing is possible
16, COMPU LINK-3 compatible
oop
COMPU LINK
“Control System
COMPU LINK control system is the convenient system
using COMPU LINK-3/SYNCHRO terminals on the rear
panel. (See page 4 and 11.)
D-D-R-P
DYNAMICS DETECTION
RECORDING PROCESSOR
This product can be combinated with a DDRP (DYNAMICS
DETECTION RECORDING PROCESSOR) system (com-
pact disc player + cassette deck, etc.) to enable setting
the optimum recording level automatically. Refer to these
instructions for details.
AUTO REVERSE OPERATION
The auto reverse operation of this unit turns the tape transport
over to the reverse of forward direction automatically when the
tape reaches its end during recording or playback.
® Because of cassette shell construction, a tape recorded in
the forward direction should be played back in the same
direction to obtain stable sound reproduction.
® During recording, auto reverse can be activated only from
the forward to the reverse direction. For good sound quality
and to avold accidental erasure of previously recorded mate-
rial, always start recording with the side A of the tape facing
oul.
CAUTIONS
1. Prevention of Electric Shocks, Fire Hazards and Damage
1) Even when the POWER switch is set to STANDBY, a very
small current will flow. To save power and for safety when
not using the unit for an extended period of time, disconnect
the power cord from the household AC outlet.
2) Do not handle the power cord with wet hands.
3) When unplugging from the wail outlet, always grasp and pull
the plug, not the power cord.
4) Consult your nearest dealer when damage, disconnection,
or contact failure is found with the cord.
5) Do not bend the cord sharply, or pull or twist it.
6) Do not modify the power cord in any manner.
7) Do not remove screws to disassemble the unit and do not
touch anything inside the unit.
8) AC power cord (For U.S.A. version only)
G (8S€r -o Nt)
This equipment has been tested and found to comply with
the limits for a Class B digital device, pursuant to Part
15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference In a
residential installation. This equipment generates, uses,
and can radtate radio frequency energy and, if not installed
which can be determined by turning the equipment off and on,
the user is encouraged to try to correct the interference by
one or more of the following measures:
The AC power cord of this unit has certain one-way direction
The only difference between models TD-W717 and connections to prevent electric shock. Refer to the illustra-
TD-W718 Is cosmetic one. tion for correct connection. (Fig. 1)
* Dolby noise reduction and HX Pro headroom extension
manufactured under license from Dolby Laboratories
Licensing Corporation. HX Pro originated by Bang & Olufsen.
* “Dolby”, the double-D symbol D0 and “HX PRO” are trade-
marks of Dolby Laboratories Licensing Corporation.
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and
receiver.
- Connect the equipment into an outlet on a circuit different
from that to which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician
for help.
and used in accordance with the instructions,
may cause harmful! interference to radio communications.
However, there is no guarantee that interference will not
occur In a particular installation. If this equipment does
cause harmful interference to radio or television reception,
Fig. 1
9) Do not insert any metallic objects into the unit.
10) Unplug the power cord when there is a possibility of light-
ning.
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11) If water gets inside the unit, unplug the power cord from the
outlet and consult your dealer.
12) Do not block the ventilation holes of the unit so that heat can
escape. Do not install the unit in a badly ventilated place.
13)Be sure to unplug the power cord from the outlet when
going out or when the unit is not in use for an extended
period of time.
2. Installation
1) Avoid placing the unit on or adjacent to an amplifier, to pre-
vent hum from being produced by some types of amplifiers.
Move the unit to a place not affected by the amplifier. Keep
the unit as far as possible from a TV set.
Avoid installing the unit in a location subject to ambient tem-
peratures exceeding 40°C (104°F) (e.g. direct sunlight,
near heaters, etc.) or less than 0°C (32°F), excessive
humidity, dust or vibrations.
Kf this set is moved suddenly from a cold place (0 °C) to a
warm place, it may not function properly because of mois-
ture generated Inside the unit. The unit will function properly
30 minutes after being moved.
3. Cleaning the cabinet
Never use benzine or thinner for cabinet cleaning as they may
damage the surface finish.
4. Cassette tape
1) Loose tape may become tangled in the tape transport mech-
anism. Remove slack by winding the tape with a pencil.
(Fig. 2)
2
3)
Fig. 2
Turn the pencil to tighten the tape.
2) The use of C-120 (120 minutes turn around) or thinner tape
is not recommended, since characteristic deterioration may
occur,
3) To prevent recordings from being erased accidentally,
remove the tab(s) with a screwdriver. Reseal the slots with
adhesive tape to erase and re-record after the tabs have
been broken off.
Side "A”
Tab "B” Side “B" Tab "A"
Adhesive tape
Fig. 3
4) Do not store cassette tapes where there is a magnetic field
(e.g. near a TV, etc.) or in a place subject to high tempera-
tures or humidity.
5. Auto tape select mechanism (decks A and B)
This deck has an Auto Tape Select mechanism which distin-
guishes between different types of tape from holes in the
cassette. After the type of tape has been detected, bias and
equalization are set to be suitable for the tape.
@ Cassettes with the detection holes:
Metal tape (EQ: 70;:s) . Type IV
CrOz (chrome) tape (EQ: 70;s) .. Type fl
® Cassettes without the detection holes:
Normal tape (EQ: 12018) ..eeeeseeseeeteeeecneene Type |
Some eartier types of metal and CrO2 (chrome) tapes may
not be provided with the detection holes. Avoid using such
tapes, since correct equalization characteristics cannot be
obtained. Also do not use ferrichrome tapes whose charac-
teristics do not match this unit.
CrOz tape detection
holes
6. Operations
When the POWER switch is turned ON or off (STANDBY) with
the deck set to the playback or recording mode, noise may
be generated. Before turning the POWER switch ON or off
(STANDBY), confirm that the m (stop) button has been
pressed.
Many operations of this unit are performed under the control
of a microcomputer. Use the unit only after carefully study-
ing the descriptions and cautions in each item. If operations
are done incorrectly, the unit may stop functioning correctly.
if this happens, turn off the power once, and then turn it on
again, so that the unit can function correctly.
=
2
Metal tape detection holes.
CONNECTIONS
® Do not switch the power on until ail the connections are
completed.
® Insert the plugs firmly, or poor contact will result, causing
noise.
@ When the pin-plug cords are employed, always connect the
white plug to the left channel terminal. This helps to avoid
reversed connections.
@ When using the Compu Link Control System version 3, do
not connect the power cord to the SWITCHED AC OUTLET of
an amplifier or receiver. Otherwise, the automatic power
on/off (STANDBY) function cannot be carried out.
1. Connection to a stereo amplifier
Note:
When installing the deck, be sure to install at a distance from
your amplifier. If they are stacked, noise (hum) may occur.
Pin-plug cords (provided)
RLS
nN
. Remote cable connection for COMPU LINK
@ By connecting a remote cable, COMPU LINK functions (auto-
matic power on/off (STANDBY), automatic source selection,
synchronized recording and DDRP recording) can be per-
formed. In this time the provided pin-plug cords must be also
connected.
® When making synchronized recording with a CD player, con-
nect the remote cable to the COMPU LINK-3/SYNCHRO
jacks.
Notes:
1. When making synchronized recordings, only a single deck
should be connected to the amplifier.
2. If a component is not a JVC COMPU LINK component,
bypass it when making the remote cabie connections.
3. This deck can be connected with an amplifier and a CD
player which have the COMPU LINK-1/SYNCHRO jacks for
COMPU LINK performance. (See page 11 for details.)
Remote cable (provided)
nea
3 Remote cable (provided with CD player)
CD player
CASSETTE LOADING
Press the * (eject) button to open the cassette holder.
Load a cassette as shown.
Press the cassette holder to ciose it. Be sure to obtain the
click sound to close the holder securely.
Ona
Load the cassette with the
tape-exposed edge down.
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NAMES OF PARTS AND THEIR FUNCTIONS
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@ POWER switch (ON/STANDBY)
@ Cassette holder (deck A)
@ Cassette operation buttons (deck A)
a : Press to wind the tape quickly from right
to left. Press this button during ptayback
to operate MUSIC SCAN.
>> : Press to wind the tape quickly from left to
right. Press this button during playback to
operate MUSIC SCAN.
@ (stop) : Press to stop the tape.
PLAY : Press to start playback/recording.
@ REC/REC MUTE : Press the PLAY button while pressing this
button to start recording, and press to
leave an appropriate non-recorded sec-
tlon. (See page 10.)
tt PAUSE : Press to stop the tape temporarily during
recording and playback. Press the PLAY
button to release the pause mode.
“® (direction) : Press to change the direction of tape
travel.
@ @ (eject) button (deck A)
@ Power STANDBY Indicator
Lights when in the power standby mode.
@ COUNTER RESET button (deck A)
Press this button to set the digital counter to ''0.00". Even if
the POWER switch is set to STANDBY, the counter value at
that time is stored in memory.
@ COMPU CAL button and indicator (deck A)
Press this button to automatically set the recording charac-
teristics with the COMPU CAL function. (See page 8.)
@ Indicators
@ OODRP indicator
@ HX PRO indicator
® Peak levet indicator
These indicators light according to the tevel of the signal
being recorded or the fevel of the signal recorded on the
tape.
Note:
0dB — : IEC (DIN) STANDARD LEVEL (250 nWb/m)
OVU — : Signal fevet at 160 nWb/m
fe < : DOLBY NR STANDARD LEVEL
® Digital counter
Normally operates as a 4-digit linear tape counter. Dur-
ing the Music Scan mode, the number of tunes which will
be skipped is displayed.
@® Mechanism mode indicators (deck A}
>> : This lights when winding the tape
from left to right.
aT : This lights when winding the tape
from right to teft.
REC : Lights when the unit is in the record
and record-pause modes; blinks dur-
ing record muting.
" : Lights in the pause mode.
PLAY. : This lights when in the playback.
<4, : Indicates the direction of tape travel.
© DUBBING>> — :"'>" fights when in the normal-speed
dubbing mode.
“>>" lights when in the high-speed
dubbing mode.
@ CONT : Lights when the unit is in the contin-
uous play mode or in the alternate
continuous recording mode.
Mechanism mode indicators (deck 8)
: Refer to ©.
@ <p : Indicates reverse mode.
@ COMPU CAL button and indicator (deck 8)
Refer to @.
@ COUNTER RESET button (deck B)
@ ¢ (eject) button (deck B)
@ Cassette holder (deck B)
@ BLANK SKIP button and indicator
When this button is turned ON during playback, if a blank (a
non-recorded section) of over 15 seconds is detected, the
deck automatically skips to the beginning of the next tune
and resume playback.
@ PHONES Jack
Connects headphones (with an impedance of 8 2 to 1 kQ).
@ PHONES LEVEL contro!
Controls headphones volume.
@ INPUT LEVEL contro!
See page 9.
@ PITCH centro! (deck A)
Varies the tape speed in deck A in the range of about +10%.
However, it cannot change the tape speed in the high-speed
dubbing.
Turning it counterclockwise toward “SLOW” causes the tape
speed to decrease while turning clockwise toward “FAST”
causes it to increase. The center click position is for the
standard speed. (See page 7.) _
@® Mixing microphone level contro!
Adjusts the microphone input level.
@ MIX MIC jack
Connects a microphone (with an impedance of 600 2 to
10 kf) to this jack.
Sounds from the microphone are monaural.
@ Cassette operation buttons (deck B)
Refer to @.
@ DOLBY NR button and Indicators
Set to B or C for recording using the Dolby NR system or for
playing back a tape that was recorded using the Dolby NR
system. Each time the button is pressed the NR mode
changes and the indicator lights. (Dolby B NR -> Dolby C NR
-> NR OFF -> Dolby B NR...)
The MPX filter turns ON/OFF depending on whether Dolby B
NR or Dolby C NR is ON/OFF (TD-W7SD only).
Set to OFF when the Dolby NR system is not used.
@ REVERSE MODE switch
Select the single side or full record/playback mode, or the
continuous play mode. Each time the button is pressed the
mode changes. (=> -> =>)-> <&)-> = ...) The current mode
can be checked with the mechanism mode indicator.
= : For single-side recording or playback.
=> : To play or record both sides A and B.
<=> : To play sides A and B continuously.
@A» B SYNCHRO DUBBING buttons
Press to dub from deck A to deck B.
® NORM SPEED : Press to perform normal-speed dubbing.
© HIGH SPEED : Press to perform high-speed dubbing.
PLAYBACK
Playback of deck A
Operate in the order of the numbers in the illustration.
@ Press the POWER switch to set to ON.
@ Load a prerecorded cassette with side A facing out.
@ Select the side to be played back.
Side A... Forward direction (PLAY » )
Side B... Reverse direction (<@PLAY)
@ Set the DOLBY NR switch to the same setting as when the
tape was recorded.
@ Select the REVERSE MODE.
@ Press the PLAY button of deck A to start playback.
@ When the deck contains a tape, the deck is turned on auto-
matically and the tape is played back by only pressing the
PLAY button.
Playback of deck B
Perform steps @ to @ of the above procedure for deck B.
Microphone mixing during playback
By connecting a microphone, microphone mixing with playback
sound from deck A or deck B is possible.
Continuous play
First set the REVERSE MODE switch to c=.
Load cassette tapes in both decks and press the PLAY button of
the deck to be played first for continuous play of both decks.
© At this time, the CONT indicator lights in the multimode dis-
play. When the tape in the deck which plays first reaches the
end of side B (in the reverse direction), it automatically
switches to the forward direction and enters the standby
mode. At the same time, the other deck starts playback.
These operations continue between decks A and B.
@ While one deck is playing back, the cassette in the other one
can be replaced. This is convenient for long-time playback of
background music.
Note:
© Use tapes recorded using the same NR mode in decks A and
B.
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PITCH control (deck A)
It ls possible to vary the tape speed in deck A in the range of
about £10% in the playback mode. The center click position Is
for the standard tape speed.
MULTI MUSIC SCAN
@ The multi music scan mechanism of this unit allows you to
quickly tocate the beginning of a specific tune (up to 99 tunes
before or after the current tune).
@ The multi music scan mechanism functions by detecting non-
recorded sections between tunes (of more than 4-5 sec.).
® The illustration shows the forward direction.
Example of fast forward scan.
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Procedure
1. Press the mp button during playback.
2. When more than 2 tunes are to be skipped, after procedure
1 press the pp (or «<q ) button the number of times you
want to skip tunes. The number of tunes to be skipped is
displayed in the counter.
® Music Scan Operation can be performed on both decks A
and B, but not simultaneously.
© Relation between Multi Music Scan and REVERSE MODE.
= : The multi music scan mechanism operates on one
side of the tape only. if the number set is too high
(more than there are tunes remaining on that
side), the tape stops when the end of the tape Is
reached.
=> : It operates continuously through one cycle of the A
and B sides of the tape. If the number set has not
been reached, the tape stops at the end of the B
side. When the head rotates to play side A from B
or B from A, this rotation is counted as one non-
recorded section. When a recorded tune continues
from side A to B, this tune Is recorded as two
tunes. In such a case, press the «eq (or me ) but-
ton one extra time.
Notes:
In the following cases, the mechanism may not operate cor-
rectly. This ts not a maifunction; use the mechanism accord-
ing to the type of program.
® Tapes with tunes having long pianissimo passages (very
quiet parts) or non-recorded portions during tunes.
® Tapes with short non-recorded sections.
BLANK SKIP
@ Press the BLANK SKIP button to turn it ON (the Indicator
fights} before playback. When a blank (a non-recorded sec-
tion) of over 15 seconds is detected during playback, the
deck automatically goes into fast-forward scan mode and
resumes playback from the beginning of the next tune.
Notes:
1. if the other deck is in Music Scan mode, the BLANK SKIP.
operation stops momentarily and restarts when the other
deck has finished.
2. The BLANK SKIP indicator lights even when the BLANK
SKIP operation is canceled momentarily, as described in 1.
3. Depending on the PITCH contro! setting, the BLANK SKIP
operation may not be performed in deck A even If a tape
with a non-recorded portion of over 15 seconds is being
played. Reset PITCH control to the center click position and
repeat the BLANK SKIP operation.
® Relation between REVERSE MODE and BLANK SKIP Func-
tions
=m : Operates on one side of the tape only.
=~): Operates continuously from side A to side B.
¢&): Operates on both sides of the tape.
RECORDING
Example: Deck B
Operate In the order of the numbers in the illustration.
@ Make sure the safety tab of the cassette has not been broken off.
It should be noted that it may be unlawful to re-record
pre-recorded tapes, records, or discs without the consent
of the owner of copyright in the sound or video recording,
broadcast or cable programme and in any literary, dra-
matic, musical, or artistic work embodied therein.
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COUNTER RESET
@ Press the POWER switch to set to ON.
@ Load a cassette for recording.
@ Set the DOLBY NA switch as required.
@ Set the REVERSE MODE switch as desired.
@ Select the side to be recorded.
@ Press the COMPU CAL button, if required. (See below.)
@ Press the 1# PAUSE button and @ REC/REC MUTE button
{record-pause mode).
REC and indicators light.
© Adjust the recording level. (See page 9.)
@ Press to ‘0.00".
@ Press the PLAY button to start recording.
Notes:
®@ When the safety tabs are removed from a cassette tape, the
tape cannot be recorded even if you try. Make sure that both
tabs are still in place when performing full recording.
® When the tape is recorded in the reverse direction (side B),
only side B is recorded and then the tape stops automati-
Cally.
DDRP (Dynamics Detection Recording Processor) recording
DDFP recording is performed with suitable JVC CD players and
the recording level adjustment is performed automatically.
Since recording level adjustment is performed automatically for
different types of tape (Type 4, II or IV), the adjustment of INPUT
LEVEL control is not required.
Read the instruction book of your CD player carefully.
COMPU CALIBRATION (COMPU CAL) FUNCTION
®@ This unit is equipped with a COMPU CAL function which can
automatically set the flat frequency characteristics and opti-
mal tape sensitivity for each tape in approximately 30 sec-
er reas data is retained for each tape type (Type |,
it or 1V).
® Calibration data set with COMPU CAL is retained even if the
power is turned off (or the power cord is unplugged), and the
previous calibration data for the same type of tape as the
new tape is recailed each time tapes are changed.
@ Performing COMPU CAL operations again replaces existing
data with the new data.
COMPU CAL operation
@ Insert the tape to be recorded and press the COMPU CAL
button. During the operation, “C” -> “CA” -> “CAL” is dis-
played in the tape counter. When the operation finishes, the
tape retums to its starting position, and the COMPU CAL
indicator lights. COMPU CALIBRATION is now finished.
® Pressing the m (stop) button part-way will interrupt the oper-
ations.
® To recalibrate the unit, press the COMPU CAL button and
wait for the COMPU CAL indicator to go out. Then, press the
COMPU CAL button again.
Note:
If the tape is near its end, it will automatically stop and an
error will be generated during operation. Therefore, be sure
to check the time remaining on the tape (more than 2 min-
utes in the play mode) before starting the operations.
COMPU CAL Errors
@ When the COMPU CAL indicator flashes, this Indicates a
COMPU CAL error.
® Press the m (stop) button to stop the error indication.
Care should be taken for the following items as they are the
cause of errors.
1) Dirty heads -Clean the heads.
2) Scratches on the tape surface
-Replace with an undamaged tape.
3) When the tape ends part-way through the operations
~Change the tape position.
4) In rare cases, tapes may have characteristics which fall out-
side the COMPU CAL setting range.
@ When an error occurs or when COMPU CAL operations are
interrupted, calibration data cannot be stored in the memory.
If settings were previously performed, the previous setting
values are retained.
® After confirming items 1) to 3) above and stopping the error
indication if there are no problems, even tapes which expe-
rience errors can be recorded on using either @ the unit's
preset values or @ previous setting values. (These are the
values obtained by opening and closing the cassette holder
one time.)
* Preset value: a standard value corresponding to each type
of tape, which allows normal recording. (The
preset value condition is in effect when the
COMPU CAL indicator is unlit.)
Notes:
1. Since COMPU CAL operations record a test tone on tapes,
previously recorded contents will be erased.
2. Using new tapes and cleaning the heads beforehand are
recommended for optimal COMPU CAL operations.
3. Some variance In characteristics exists even with the same
type of tape made by the same manufacturer. Therefore,
when precise settings are desired, performing COMPU CAL
operations for each recording is recommended.
4. To delete contents set with COMPU CAL, simultaneously
press the @® REC/REC MUTE and B deck COUNTER RESET
buttons. This deletes the calibration data for the type of tape
currently inserted in the unit. Calibration data for other tape
types is not deleted.
INN/OAAARVYGOLZ MOL
TONLZEZM-OL

6 (8SEr ‘ON
ALTERNATE CONTINUOUS RECORDING BETWEEN
DECK A AND DECK B WITH AUTOMATIC SELECTION
@ Load the tapes to be recorded in decks A and B with sides
A facing out. (Be sure to wind past the leader tapes.)
@ Press the <® (direction) buttons to select the tape transport
directions of decks A and B.
@ Set the DOLBY NR switch as required.
@ Set the REVERSE MODE switch to cs).
@ Set deck A to the record-pause mode and adjust the record-
ing level.
@ Set deck B to the record-standby mode. (press only the
@ REC/REC MUTE button.)
In this time, the REC and CONT indicators light, and the
4 orp indicator flashes, showing the direction of the next
tape that will be recorded.
@ Press the PLAY button of deck A; continuous recording
starts.
@ When recording finishes in one deck and continues in the
other, the CONT indicator goes off and the « orp indicator
stops flashing.
@ When side B of deck A finishes recording, deck B starts
recording automatically. If both decks start recording from
the beginning of side A, the continuous recording will be
done for about 3 hours with two C-90 tapes. When starting
recording fram deck B, set deck B to the record (or record-
pause) mode first and set deck A to the record-standby
mode.
To cance! the record-standby mode.
Press the m (stop) button on the deck during record-standby.
MICROPHONE MIXING DURING RECORDING
By connecting a microphone, microphone mixing during
recording Is possible by following the recording procedure.
Adjust the microphone input level by setting the record-pause
mode and observing the peak level indicators.
®@ When the record-pause mode is set and the INPUT LEVEL
control is set to MIN, sounds are output only from the micro-
phone, and it can be used as a public address system.
RECORDING LEVEL ADJUSTMENT
Adjust the recording leve! while observing the peak level indi-
cator indication. For example:
With Type {V (metal) tape
(TD-W7SD)
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(TD-W717/718)
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Because of metal tape’s higher saturation level, it is OK that
occasionally, +4" lights on the TD-W7SD, and “+2” fights on
the TD-W717/718.
With Type | (normal) or Type tl (chrome) tape
6 ow 200 2 4
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6 +8dB
t 28488288
Ro ossconmeeessccoseo boom
It is OK that ‘+ 0” lights occasionally.
@ When the recording level is too low, the hiss noise Inherent
in the tape will be conspicuous.
@ When the recording level is too high; exceeding the satura-
tion level, the recording will contain cracking noise and will
be distorted.
© If + 4” lights too often because the recording level is too
high, the recorded sound may be distorted and seem to be
breaking up. If only “0” lights infrequently, the level is too
low and the recording may contain tape hiss.
it is best to adjust so that the maximum sound level of the
source to be recorded reaches the very limit of the saturation
level of the tape to be used.
The best level varies depending on the type of music and type
of tape so it Is better to make a test recording, using FM music,
records, etc.
AUTOMATIC RECORD MUTING
This facility is used to eliminate undesired sections and leave
an appropriate non-recorded section.
A. To leave non-recorded sections of about 4-5 seconds auto-
matically
1. When the undesired section comes during recording,
press the @ REC/REC MUTE button and release it.
2. The REC indicator flashes and a non-recorded section
is made during record muting operation. About 4-5
seconds later, the tape automatically stops, and the
unit enters the record-pause mode.
3. Press the PLAY button to start recording again.
B. To leave non-recorded sections of more than 4-5 seconds
1. Keep the @REC/REC MUTE button pressed continu-
ously as long as you want to make a non-recorded
section. By releasing the finger from the button after
the above operation, the unit enters the record-pause
mode.
2. Press the PLAY button to start recording again.
C. To leave non-recorded section of less than 4-seconds
When the undesired section comes during recording....
After the @ REC/REC MUTE button is pressed, press the
PLAY button before the unit enters the pause mode to start
recording again, or press the ai PAUSE button to enter the
record-pause mode.
@ The peak level indicator lights even during record muting
according to the input level which can be heard from the
speakers or headphones so that recording can be resumed
at the exact point on the tape.
ERASING
When recording on a prerecorded tape, the previous recording
is automatically erased and only the new program is recorded
on the tape.
To erase a tape without making a new recording...
Follow the section “RECORDING” but in step @, set the NPUT
LEVEL control to MIN.
LINEAR TAPE COUNTER OPERATION
When the power is connected, “0.00" appears in the display.
During tape playback, the digital counter operates as a 4-digit
jinear tape counter which displays the approximate playback
time in minutes and seconds for C-46L, C-60, and C-90 tapes.
There is a one-minute error differential between the actual play-
back time and the playback time displayed. With C-30, C-46,
C-80, and other tapes, this differential is even greater. A differ-
ent time may also appear for tapes of the same length but with
a different thickness.
DOLBY NA@ and DOLBY HX PRO
Dolby NR System
To reduce the hiss inherent in tape recording, use the Dolby NR
System when making recordings. When listening to a tape
recorded with the Dolby NR System, set the DOLBY NR switch
to B or CG according to the system selected in the recording
mode.
Note:
The sound quality will change if the positions of the DOLBY NR
switch are different in recording and playback.
-10-
Dolby HX PRO headroom extension
When a source which contains many high-frequency compo-
nents is recorded, these high-frequency signals have the same
function as bias and therefore, the effective bias current
changes.
This will result in phenomena such as changes in the level of
low-frequency signal and subsequent distortion and reduction
of the high-frequency saturation level.
Dolby HX PRO headroom extension system controls the bias
current so that the effective bias is constant even when there
are fluctuations in the high-frequency components of the input
signal.
This greatly improves the high-frequency saturation level while
reducing the low-frequency signal level variations and distor-
tion.
®@ The dynamic sound recorded with this system sounds the
same even when the tape is played back in a deck that does
not have Doiby HX PRO.
® This system automatically works when in recording; how-
ever, Dolby HX PRO is not a noise reduction system.
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PONLZLZM-GL

(8SEv ON) OL
COMPU LINK CONTROL SYSTEM
COMPU LINK
“Control System
The Compu Link Control System controls relative operations
between components automatically and facilitates various oper-
ations.
This is a system originated and developed by JVC for facititat-
ing various system operations. There are two versions of this
system; version 1 and 3. (For version 1 components, “COMPU
LINK-1/SYNCHRO” is marked on the rear panel. For version 3
components, “COMPU LINK-3/SYNCHRO” is marked on the
rear panel. This unit belongs to version 3.)
The version 3 system controls relative functions between this
unit and an amplifier or receiver, in addition to all of the func-
tions of version 1.
Automatic Power On/Off (STANDBY) Function (COMPU
LINK-3)
This function is available when an amplifier or receiver having
a COMPU LINK-3/SYNCHRO terminal is connected. For exam-
ple, if a deck contains a tape, the deck is turned on automati-
cally and the tape Is played back by only pressing the PLAY
button. When the amplifier or receiver is switched to STANDBY,
the source unit Is automatically switched to STANDBY.
Automatic Source Selection (COMPU LINK-1, 3)
When the provided remote cables are used for connecting this
unit to other components which have COMPU LINK-1 or
3/SYNCHRO terminals, the switch-over of all system compo-
nents Is possible with simple one-touch of the source selector
button of JVC’s amplifier or receiver.
By doing this, the corresponding component will start playing
automatically.
The source selector button of the remote control unit or the
activation button of the desired component can be also used for
this purpose. When the components have been switched over,
the previous component will stop playing within five seconds.
Synchronized Recording (COMPU LINK-1, 3)
Synchronized recording refers to the process in which the deck
Starts recording in synchronism with the CD player. Perform the
synchronized recording as follows:
1. Set the cassette deck to the record-pause mode in accor-
dance with the recording procedures on page 8.
2. If you want the programmed recording, program the desired
tunes In any order you wish to hear.
3. Press the PLAY/PAUSE button of the CD player. By so
doing, the cassette deck is placed in the record mode and
synchronized with the CD player for recording. Synchro-
nized recording thus can be made possible.
DDRP (Dynamics Detection Recording Processor) recording
The DDRP function makes possible fully automatic recording
when used with a suitable JVC CD player. When the DDRP but-
ton of a suitable JVC CD player is pressed, the recording level
is first adjusted automatically, then recording starts; it is not
necessary to start recording by the normal procedure.
~~
Notes:
@ Synchronized recording or DDRP recording stops automati-
cally when the CD player stops playing.
@ Synchronized recording does not start except when the
record-pause mode Is set by simultaneously pressing
the @REC/REC MUTE and If PAUSE buttons In the stop
mode.
e@ To cancel synchronized recording or DDRP recording, press
the STOP button of the CD player or cassette deck.
@ The source is locked to the CD position during synchronized
recording or DDRP recording to avoid accidental stops or
switch-over to another component. To switch over the com-
ponents, cancel synchronized recording or DDRP recording
first.
e@ The INPUT LEVEL control does not function during DDRP
recording.
DUBBING
@ Synchro dubbing
Operate in the order of the numbers in the illustration.
@ Press the POWER switch to set to ON.
@ Insert a prerecorded tape with side A facing out into deck A,
and press the <® (direction) button to select the travel
direction.
@ Insert the blank tape with side A facing out into deck B, and
press the <> (direction) button to select the side to be
recorded.
@ Select the REVERSE MODE.
@ Press to 0.00".
@ Press the SYNCHRO DUBBING (NORM or HIGH SPEED) but-
ton to start dubbing.
@ Press the m (stop) button of deck B to stop dubbing.
~12-
When deck B stops, the dubbing mode is automatically
released.
® Synchro record muting
When deck A stops or enters any mode other than the play-
back mode during dubbing, deck B enters the record mute
operation automatically and then enters the record-pause
mode.
® Before pressing the SYNCHRO DUBBING bution
Confirm that both decks are in the stop mode before starting
dubbing.
Dubbing and DOLBY NR switch
During dubbing, the same NR mode selected for the playback
cassette is applied to the recording cassette, regardless of the
position of the NR switch.
Dubbing and BLANK SKIP
When the BLANK SKIP button is ON during normal-speed dub-
bing, the BLANK SKIP function operates in deck A.
When deck A enters in the BLANK SKIP mode, deck B enters
standby status for the record-pause mode after automatic
record muting operation.
When deck A resumes playback, dubbing commences.
Input jevel
Recording is performed at the same {evel as the playback tape
during dubbing regardless of the position of the INPUT LEVEL
control.
Microphone mixing during dubbing
By connecting a microphone, microphone mixing during dub-
bing is possible with the playback sounds from deck A. Be sure
to perform dubbing at normal speed. When performing micro-
phone mixing during dubbing, use cassettes recorded with NR
OFF mode for the deck A.
Tape editing
1. Press the @REC/REC MUTE button when finished dubbing
a tune. Deck B automatically enters the record muting mode
and leaves a non-recorded section of about 4-seconds then
enters the record-paused mode.
2. Press the m (stop) button of deck A and search for the next
tune you want by using the pm» , <4 or PLAY button. Then
stop the cassette just before the beginning of the tune.
3. Press the same SYNCHRO DUBBING button pressed before
the pause again, and dubbing will start.
Notes at dubbing
1. Normal-speed dubbing is recommended to obtain good
sound quality.
2. Television receivers placed close to the deck may cause
interference on the recorded signal when the deck is used
in the high-speed dubbing mode. if this happens, either turn
off the television receiver or use the normal-speed dubbing
mode.
INNONAAAYYGQLZ M-GL
PONLZLZM-GL

MAINTENANCE
The Importance of cleaning
When the tape is moving, magnetic powder and dust naturally
accumulate on the heads, capstan and pinch roller. When they
become too dirty:
@ tone quality deteriorates.
@ the output sound level drops.
@ the previous sound is not erased satisfactorily.
@ recordings are not satisfactory.
Because of this, clean the heads, etc. every 10 hours of use so
Demagnetizing the heads
Magnetic objects brought close to the head or using the deck
for a long period of time results in magnetization of the head,
thus noise occurs. When the noise is excessive, high frequen-
cles on the recorded tape may be erased.
Demagnetize the heads and other metal parts that come Into
contact with the tape every 20-30 hours of use with a head
demagnetizer (available from your audio store).
LL (8G€p “ON
that optimum recordings will be made.
Cleaning the heads, pinch roller and capstan
Wipe the heads, the capstan, etc. with a cotton swab with its tip
dipped in alcohol. For effective cleaning, use a cleaning kit
available from your audio store. After cleaning, be sure that the
cleaning fluid has completely dried before loading a cassette.
Capstan
Ped roller
Erase head Record/playback head
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[1] Location of Main Parts
@ Top view
A
Power transformer Power supply transistor Main board asas’y
A
Cord stopper
Model: TD-W718
A
Power cord Ee
Deck A Mechanism control Deck B
Mechanism ass’y board ass’y Mechanism ass’y
Fig. 1-1
M@ Mechanism
@
Top
view
Reel
motor
ass'y
@
Bottom
view
Reel
motor
(Deck
B)
SUPPly
reel
disk
Take-up
reel
disk
nner
Reel
motor
board
assy
Pinch roller ass’y (L)| Pinch roller ass’y (R) Capstan motor
Eject safety R/P Head FM bracket
Fig. 1-2 Fig. 1-3
12 (No. 4358)

[2] Removal of main parts
m Enclosure Section
@ Top cover (Fig. 2 - 1)
1. Remove four screws @ retaining the top cover from both
side.
2. Remove two screws @) retaining the top cover from the
back side.
3. To remove the top cover ,slide in direction of allow and lift
away (refer to Fig. 2 — 1).
Front panel assembly (Fig. 2 - 2)
1. Remove the top cover as described in above.
2. Remove three screws @ retaining the front panel ass’y
from bottom side.
3.Release the front panel ass’y from two pawis in the front
and bottom sides and draw it to the front side.
4. Disconnect all connectors between the mechanism ass’y,
front panel ass’y and the main board ass’y.
ML
S&S
Push up with a screwdriver, etc. 1
@ Mechanism assembly
% Although the mechanism assembly can be removed
without detaching the front panel ass’y, it is recommended
to detach the front panel ass’y to do the work with ease.
1. Remove two screws ® or two screws 6) from the corners of
the mechanism. (Fig. 2 - 5)
2. After disconnecting the mechanism control board from the
connector of the mechanism board, remove two screws (1)
to remove the mechanism control board. (Fig. 2-3, 2-4)
3. Open the door and remove the mechanism ass’y.
(At this time, door lock arm spring and door lock arm are
removed together with.)
4. For moving the mechanism ass’y only, disconnect the
following wirings.
a) Mechanism ass’y side (Fig. 2 — 4)
Top side connector of the cam switch board (CN2).
Connector of the motor board (CN1). (Board to Board
connector)
b) Main board ass’y side (Fig. 2 - 3)
Disconnect CN802 from Mecha control board, CN801 and
CN803 from Switch & Volume board ass’y, CN871 from Mic
board ass’y and CN861 from H. Phone jack board ass’y.
Disconnect wire coming from the head mount ass’y CN811
at deck A and CN815 at deck B.
Remove two screws © and remove the two GND wires
from Deck A and Deck B.
From Mecho control
board
CNBO2
a
©
poe pinnae j (“" MIC boord
Z “er CN86 ly” CNBO: wr
rom DECK B
TD-W717TNe
TD-W718BKaeerenrausut
MAIN BOARD
12
From Phone jock
board
From SW & VR board
DECK
Aj
Mecha
control
board
DECK
B
CN8O3
me
Cam switch board
WL.
Cam switch board
Fig. 2-4
(Ny - 4858) 13

TD-W717 TNe
TD-W718BKweeenc/usut
@ Eject arm ass’y (Fig. 2-5)
1. Remove two screws @ retaining the eject arm ass’y and
pull it out.
@ Mechanism holder and door ass’y (Fig.2-6 — Fig.2-8)
1, Remove four screws ® retaining the mechanism holder.
(see Fig.2-8)
2. Remove the damper ass’y(for easy reassembling work).
Insert an originary( — )screwdriver or the like in to the gap
between the damper and the front panel to disengage the
pawl , and draw the damper ass’y outwards.(see Fig 2 — 6)
3. Remove the arm shaft of the cassette holder (door
ass'y)from the mechanism holder.(The door spring is
engaged with the door side by the longer side.)
(see Fig. 2 - 7)
4. Remove the eject spring from lock lever and mechanism ;
ass'y. (see Fig. 2 - 7) Fig. 2-6
@Switch & Volume board ass’y and Mechanism Control How to engage the door and eject spring
board ass’y (Fig. 2 - 8)
1. After removing the mechanism holder, proceed to the
Lock lever
following steps.
2. Pull out the INPUT volume knob.
3. Remove five screws @) retaining the Switch & Volume P.C.
aan!
board.
Longer
side
re
4. Remove one screw @ and remove the cap. : 2 a
door spring ‘ a
Cassette Door
B=
5. Lift the board right upwards to remove it since it is connected :
ght up’ Shorter side ie eject spring
Mechanism ass'y
to the mechanism control key board with connector pins
(CN603/CN604). Fig. 2-7
6. Disconnect CN602 coming from Mechanism control board
ass’y (CN702). Mecha control board
@ Headphone jack board ass’y and Mic jack board ne CAP
ass’y (Fig. 2 - 8) oO = O O
1. After removing the Switch & Volume board ass’y, pull the 8 | =
H. Phone jack board ass’y and Mic jack board ass’y out- 1 =
wards while pushing it down toward the bottom side to re- “| eye a Yue -
Key switch board Mic jock board\ -H. Phone jack board Key switch board
move
it.
Switch
&
Volume
board
Key switch board ass’y (Fig. 2 - 8) nish
1. Remove one screw@ (DeckA or B) retaining the board < ;
en Fig. 2-8
2. Do the same for the other side. cnet
Key switch board ass’y
@ Main board ass’y (see Fig2 — 3,Fig 2 — 1)
1. Remove four screws @ retaining the board.
2. Remove four screws @ retaining the board to the rear panel.
14 (No. 4358)

TD-W717TNes
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@ Reassembling procedure of the front panel ass’y
Mechanism A
1. Attach the Key switch board ass’y to the panel with two
screws.
Np
. Put the door ass’y and the mechanism holder together with
on the front panel.
o
Attach the mechanism holder to the front panel ass’y with
two screws.
. Engage the door spring properly.
Pinch roller (ieft) Pinch roller (right)
Head mount
. Install the eject arm ass’y.
. Attach the Switch & Volume board ass’y to the panel with
five screws. e
Install the mechanism ass’y.
9.
HooK
the
eject
spring
between
lock
lever
and
mechanism
ee
Head
mount
ass'y
ass'y.
410.
Attach
the
Mecha
control
board
ass’y
to
the
panel
with
ar
two screws.
4
5. Install the damper. (Push the pawl side last to engage it.)
6
7
oo
w
Cassette
mechanism
section
Head bose
@
Head
mount
assembly
(Fig2-9,Fig2-10)
1.
Remove
three
screws
(1)
retaining
the
head
mount
ass’y.
@
Pinch
roller
assembly
(Fig.
2
-
9,
Fig.
2
-
11)
1.Remove the pinch roller and pinch roller spring by disen-
gaging the pawl hooking it.
2. For reengaging the pinch roller and pinch roller spring, refer
to Fig. 2-11.
Pinch roller
(left left)
Pinch roller
(right)
Fig. 2-711
(No - 4358) 15

TD-W717TNevs
TD-W718BKwseencurut
@ FM bracket/Capstan motor assembly (Mechanism
A and B)
1. Remove soldering of connector FM on Reel! motor board.
(Fig. 2 - 12)
2. Remove three screws @) and disengage two pawis, and then
the FM bracket and the capstan belt can be removed. (Fig.
2-12, 2 - 13)
3. Remove two screws @) retaining the capstan motor from the
FM bracket. (Fig. 2 — 12)
4. For reengaging the capstan belt, refer to Fig. 2 - 13.
Flywheel ass’y (Fig. 2 - 14)
1. Remove two screws @ and remove the shield plate.
2. Pull up the Flywheel (L) and (R) and remove them.
@ Reel motor board (Fig. 2 - 14)
1.Remove four soldering of the Reel motor and Actuator
motor.and remove the Reel motor board.
@ Reel motor board (Fig. 2 - 15)
1. Remove two screws © from rear of chassis and remove the
Reel motor ass’y toward upward.
@ Actuator motor ass’y (Fig. 2 — 15)
1. Remove two screws © from rear of chassis and remove the
Actuator motor ass’y toward upward.
Reel motor
Actuator motor Soldering Reel motor board ass’y
Soldering
Flywhell(R) Shield plate —_- Flywheel(L)
16 (No. 4358)
Reel motor board oss'y connector FM
FM bracket
Fig. 2-12
| | Capstan belt
Actuator motor ass'y
Fig. 2-13
Real motor ass'y
Capstan motor

TD-W717TNes
TD-W718BKaeeven/cusut
@ Mechanism board ass’y (Fig. 2 - 16)
Mechanism board ass'y
1. Remove one screw () retaining the board.
2, Release the Mechanism board from five pawls.
3. For gearing between the Mechanism board and Control cam,
see the magnified illustration in a circle.
@ Control cam (Fig. 2 - 17, 2 - 18)
1. Release the contro! cam from two pawls. (Fig. 2 - 17)
2. For assembling the control cam, fits (a) zone (groove) of
control
cam
to
@)
position
of
Pinch
lever
and
(©)
zone
<ul
(groove)
to
(6)
position
of
Head
base
shaft.
(Fig.
2
-
17,
2
Fig.
2-16
- 18)
@ Actuator gear A and B (small) (Fig. 2 - 17)
1. Release the actuator gear A (small) from one pawl and re-
move it toward upward.
2. Release the actuator gear B (small) from one pawl and re-
move it toward upward.
@ Actuator gear (large) (Fig. 2 - 17)
1. After removing the Control cam, actuator gear A (small)
and actuator gear B (small), remove the Actuator gear
(large).
Actuator gear A Actuator gear
(small) (large)
Pawl
Control cam
Pow
(chassis
side)
ActuatorgearB Pinch lever Pawl Control cam Head base shaft Pinch jever
(small)
Fig.
2-17
Fig.
2-18
(No. 4358) 17

TD-W717TNev
TD-W718BK aecrenscsusut
[3] Main Adjustment
@Measuring instruments required for
adjustment
(1) Low — frequency oscillator(oscillation frequency
50Hz — 20kHz, 0dB output with 600 Q impedance )
(2) Attenutor(600 Q impedance)
(3) Electronic voltmeter
(4) Standard tapes
VTT712 (3kHz tape speed, wow and flutter
measurement)
V1T727 (400 Hz) (DOLBY standard level)
TMT735 (1 k, 12.5 k), VIT739 (63, 1 k, 10 k) (playback
frequency)
VTT703 or VTT703L (10 kHz), VIT704 (12.5 kHz)
(azimuth)
TMT6447, TM6448 (music scan)
(5) Recording reference tapes
AC-224 (Normal), AC-513 (TDK SA) (CrOz)
AC-712 (TDK MA) (Metal)
(6) 600 Q resistors(for attenuator matching)
(7) Distortion meter(bandpass filter)
(8) Torque gauge (cassette) for CTG-N, TW2111, TW2121,
TW2231 and TW2241, mechanism adjustments
@ Location of Adjustment
DECK A
HX PRO odj
1
1
8451
2 Say Momo)
vrit1 FREQUENCY
VR216
L1451
Le] VR116
NORMAL SPEED adj.
(9) Wow & flutter gauge
(10) Freequency counter gauge
(11) M300 gauge
(12) Band pass filter
@ Power supply voltage
Set the line voltage selector switch to 240V/ 230V/
220V/ 127V/ 120V/ 110V according to ——
your local voltage.
AC240V, 50/60Hz :Aversion
AC230V, 50/60HzZ __—:B/E/EN/G version
AC120V, 60Hz :C/J version
AC230/127/110V, 50/60Hz:U/UT version
(13) Standard position of the switch and volume knob
Switches and volume knobs Setting position
INPUT LEVEL MAXIMUM
DOLBY NR OFF
REVERSE MODE —
PITCH CONTROL CENTOR
MIC MIXING LEVEL MAXIMUM
COMPU CAL LED OFF
PHONES LEVEL MAXIMUM
BLANK SKIP OFF
CN841 (DECK A)
CN846 (DECK B)
CONNECTION
F. COUNTER
(BIAS
FREQUENCY
adj)
DC VOLTMETER
(HX PRO adj)
DECK B
FREQ.
RESPONSE
adj
F.TUNING
TP
H.SPEED
TP
HIGH SPEED adj —————
18 (No. 4358)

TD-W717TNes
TD-W718BKa/eveenrasusut
@
Compu-Calibration
for
F.CAL
mode(automatically
adjustment)
@ F.CAL mode setting procedure
1. Short the F.TUNING TP and GND on mecha control board ass’y.
2. Before set the F. CAL mode, press the Counter Reset key while pressing the STOP key of deck B by reason of cancellation
the factory setting level.
3. Press the POWER key while pressing the FF [ 88 ] key of deck A under the power standby mode.
At the same time, [F.CAL] mode is displayed on the deck B counter of FL indicator.
NOTE: When Compu-Calibration is finished normally, [(COMPU-CAL] LED light up and result number of calibration is dis-
played on the counter of FL indicator.
If Compu-Calibration is finished abnormally, [COMPU-CAL] LED blinks and error number of calibration is displayed
on the counter of FL indicator.
Then correct the error message and readjust the Compu-Calibration.
Item Condition Adjustment
Level meter Mode:REC/PAUSE 1. Supply a 400Hz or 1kHz signal to both L and R of LINE IN terminals at
sensitivity at deck B -4dBs.
adjustment Test sigan level: 2. Press the [COMPU-CAL] key of deck B,adjust the level meter
400Hz or 1kHz,-4dBs sensitivity automatically.
Input:LINE IN(L and R) 3. Confirm that difference level between left and righkt within 0.3dB.
Playback level | Direction:FWD(decks 1. Load the VTT-727 test tapes to both decks A and B.
adjustment at | A and B) 2. Press the [PLAY] key of deck A and playing back the tape.
decks AandB | NR:OFF 3. Press the [COMPU-CAL] key of deck A and adjust the playback
Test tape: VTT-727 levels of both decks A and B automatically.
ee roe eee
Recording Direction:FWD(decks 1. Load the AC-224 tapes to both decks A and B.
charactor A and B) 2. Press the [COMPU-CAL] key of deck A,start the recording
adjustment Recrding tape: charactor adjustment of deck A and then deck B automatically.
(Bias and AC-224(normal) After while about 50 seconds, adjustment is completed automatically.
REC/PB AC-513(CrO2) While adjusting, confirm that all segment is displayed on FL indicator.
sensitivity) AC-712(metal) 3. Load the AC-513 tapes to both decks A and B and adjusting as the
at decks A NR: OFF same manner above step 2.
and B Afer while about 40 seconds, adjustment is completed automatically.
4. Load the AC-712 tapes to both decks A and B and adjusting as the
same manner above step 2.
After while about 40 seconds,adjusting is completed automaticaly .
NOTE; When recording the each tapes, do not use while about 3 mnutes
range of tape start and end winding positions.
(No, A358) 18-1

TD-W717TNess
TD-W718BKwseeneurut
\f following error messages are indicated on the FL indicator when adjusting the Conpu-Calibration,correct these abnormal
conditions and readjust the Compu-Calibration.
1. In case the Level meter sensitivity adjustment.
(Error No.) (Contents of the message)
ERO1 No signal
ERO2 Over the adjustment range,too much large the input signal level
ERO3 Over the adjustment range,too much small the input signal level
2. In case the Playback level adjustment/
No playback signal
Over the adjustment range,too much large the playback signal
Over the adjustment range,too much small the playback signal
3. In case the Recording signal adjustment.
(1) For Lch
ER12 No 400Hz test signal for recording
ER13 No 12.5kHz test signal for recording
ER14 No playback signal (Do not recrded)
ERi5 Can not find the recording start position
ER16 Over the adjustment range of 400Hz playback signal level,too much large 400Hz playback signal
ER17 Over the adjustment range of 400Hz playback signal level,too much small 400Hz playback signal
ER18 Too much large 12.5kHz playback signal level compare with 400Hz signal
ER19 Too much small 12.5kHz playback signal level compare with 400Hz signal
(2) For Reh
No 400Hz test signal for recording
No 12.5kHz test signal for recording
No playback signal (Do not recorded)
Can not find the recording start position
Over the adjustment range of 400Hz playback signal level,too much large 400Hz playback signal
Over the adjustment range of 400Hz playback signal level,too much small 400Hz playback signal
Too much large 12.5kHz playback signal level compare with 400Hz signal
Too much small 12.5kHz playback signal level compare with 400Hz signal
(3) For Lch and Reh
Compu-Calibration of AC-513 adjustment is started before adjustment of AC-224 is not complete
finished
Compu-Calibration of AC-712 adjustment is started before adjustment of AC-224 is not complete
finished
18-2 (No. 4358)