JVC XV-D721BK User manual

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SERVICE MANUAL
DVD AUDIO/VIDEO PLAYER
No.A0002
Nov. 2000
XV-D721BK
XV-D723GD
Contents
Safety Precautions
Preventing static electricity
Important for laser products
Importance Admistering
point on the Safety
Disassembly method
Adjustment method
Description of major ICs
1-2
1-3
1-4
1-5
1-6
1-11
1-18
COPYRIGHT 2000 VICTOR COMPANY OF JAPAN, LTD.
This service manual is printed on 100% recycled paper.
XV-D721BK
XV-D723GD
Area Suffix
XV-D721BK
J
C
EG
ES
EN
EE
Area Suffix
XV-D723GD
A
J
EG
ES
EN
UF
U.S.A
Canada
Germany
Spain
Northern Europe
Russian Federation
US Minitary
Australia
U.S.A
Germany
Singapore
Northern Europe
China
Brazil,Mexico,Peru

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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 manufacturer`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 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 re-assembling.
5. Leakage currnet 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 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, 1,000 ohms
per volt or more sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by
a 0.15 F AC-type capacitor between an exposed
metal part and a known good earth ground.
Measure the AC voltage across the resistor with the
AC voltmeter.
Move the resistor connection to eachexposed metal
part, particularly any exposed metal part having a
return path to the chassis, and meausre 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.).
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.
Good earth ground
Place this
probe on
each exposed
metal part.
AC VOLTMETER
(Having 1000
ohms/volts,
or more sensitivity)
1500 10W
0.15 F AC TYPE
!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.

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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.
1.1. Grounding to prevent damage by static electricity
Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as DVD players.
Be careful to use proper grounding in the area where repairs are being performed.
1.1.1. Ground the workbench
1. 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.
1.1.2. Ground yourself
1. Use an anti-static wrist strap to release any static electricity built up in your body.
1.1.3. Handling the optical pickup
1. 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.)
2. 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.
1.2. 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. It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it
Conductive material
(conductive sheet) or iron plate
(caption)
Anti-static wrist strap

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 compact disc player uses invisible
laserradiation and is equipped with safety switches
whichprevent emission of radiation when the drawer is
open and the safety interlocks have failed or are de
feated. 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 herein may result in
hazardous radiation exposure.
REPRODUCTION AND POSITION OF LABELS
WARNING LABEL
CLASS 1
LASER PRODUCT
CLASS 1
LASER PRODUCT
!Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.
CAUTION -
-
LASER RADIATION WHEN OPEN.
DO NOT STARE INTO BEAM.
ATTENTION RAYONNEMENT LASER EN CAS D’OUVERTURE.
NE PAS REGARDER DANS LE FAISCEAU.
-VORSICHT LASERSTRAHLUNG, WENN ABDECKUNG GEÖFFENET.
NICHT IN DEN STRAHL BLICKEN.
-ADVARSEL LASERSTRÅ LING VED Å BNING.
SE IKKE IND I STRÅ LEN.
-ADVARSEL LASERSTRÅ LING NÅ R DEKSEL Å PNES.
STIRR IKKE INN I STRÅ LEN.
-
VARNING LASERSTRÅ LNING NÄR DENNA DEL ÄR ÖPPNAD.
STRRA EJ IN I STRÅ LEN.
VARO! AVATTAESSA OLET ALTTIINA LASERSÄTEILYLLE.
ÄLÄ TUIJOTA SÄTEESEEN.
-
-
ANALOG
DIGITAL
FRONT CENTER
SUBWOOFER
PCM/STREAM
AUDIO OUT AV COMPU LINK
LEFT
RIGHT
LEFT
RIGHT
OPTICAL COAXIAL
VIDEO S-VIDEO YP
B
P
R
SCAN MODE
COMPONENT
VIDEO OUT
525p 525i
1
AC IN
REAR
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XV-D721BK/XV-D723GD C/J ONLY
Full Fuse Replacement Marking
Graphic symbol mark
(This symbol means fast blow type fuse.)
should be read as follows ;
FUSE CAUTION
FOR CONTINUED PROTECTION AGAINST RISK
OF FIRE, REPLACE ONLY WITH SAME TYPE
AND RATING OF FUSES ;
F901 : 1.6 A / 125V F901 : 1.6 A / 125V
XV-721BK/XV-723GD C/J SEULEMENT
Marquage Pour Le Remplacement
Complet De Fusible
PRECAUTIONS SUR LES FUSIBLES
POUR UNE PROTECTION CONTINUE CONTRE
DES RISQUES D'INCENDIE, REMPLACER
SEULEMENT PAR UN FUSIBLE DU MEMETYPE ;
Le symbole graphique (Ce symbole signifie
fusible de type a fusion rapide.)
doit etre interprete comme suit ;
Note : It's means "J" for U.S.A.market model and "C" for canada market model.
Importance Admistering point on the Safety

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Remove the four screws A on each side of the body.
Remove the two screws B on the back of the body.
Remove the top cover from behind in the direction of
the arrow while pulling the lower part of the sides.
1.
2.
3.
Disassembly method
< Main body>
Removing the top cover (See Fig.1)
Prior to performing the following procedure, remove
the top cover.
Remove the sixteen screws C on the back of the
body.
1.
Removing the rear panel (See Fig.2)
Prior to performing the following procedure, remove
the top cover.
Removing the fitting (See Fig.3 to 5)
Lower the mechanism by moving the lever marked a
in the direction of the arrow from the upside of the
body (Refer to Fig.3).
Manually eject the loading tray toward the front.
Remove the fitting from the loading tray by releasing
the joints b on the both sides of the fitting.
Push and return the loading tray.
1.
2.
3.
4.
To remove the front panel assembly and
the DVD mechanism assembly, remove
the fitting in advance.
ATTENTION:
Fig.1
Fig.2
Fig.3
Fig.4Fig.5
Top cover
Rear panel
Lever a
Loading tray
Loading tray
B
CC
A2 A2
C
C
CC
Loading tray
Fitting
Joint b
Joint b

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Prior to performing the following procedure, remove
the top cover and the fitting.
Disconnect the card wire from connector CN818 on
the regulator board.
Turn back the body and remove the three screws D
fixing the front panel assembly.
Release the two joints c on both sides of the body
and remove the front panel assembly toward the
front.
1.
2.
3.
Removing the front panel assembly
(See Fig.6 to 9)
Fig.6
Fig.7
Fig.8
Fig.9
Regulator board
CN818
Front panel assembly
Front panel assembly
Joint c
Joint c
(Bottom)
DD

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Prior to performing the following procedure, remove
the top cover and the fitting.
It is not necessary to remove the front panel
assembly.
Disconnect the card wire from connector CN816 and
the harness from CN817 on the regulator board.
Disconnect the card wire from connector CN701 on
the video board.
Disconnect the card wire from CN831 on the DSP
board.
Remove the four screws E and the DVD mechanism
assembly by pulling out from the front panel
assembly backward.
1.
2.
3.
4.
Removing the DVD mechanism
(See Fig.10)
Prior to performing the following procedure, remove
the top cover.
It is not necessary to remove the rear panel.
Disconnect the card wire from connector CN816 and
CN818 and the harnesses from CN815,CN817 and
CN711 on the regulator board.
Remove the three screws F attaching the regulator
board.
Remove the two screws C on the rear panel.
1.
2.
3.
Removing the regulator board
(See Fig.11 and 12)
Fig.10
Fig.11
Fig.12
Video board
CN701
Regulator board
CN816
Regulator board
DSP board
CN831
DVD mechanism assembly
CN817
CN816
CN711 CN815
CN817
CN818
Rear panel
E
E
E
F
F
F
CC
E

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Prior to performing the following procedure, remove
the top cover.
Removing the video board
(See Fig.13 and 14)
Disconnect the harnesses from the connector CN711
on the regulator board.
Disconnect the card wire from connector CN701 on
the video board.
Remove the five screws C on the rear panel.
1.
2.
3.
Removing the Audio board 1,2 and 3 / the
Audio board (See Fig.13,15 and 16)
It is not necessary to remove the rear panel.
Ref. :
Prior to performing the following procedure, remove
the top cover and rear panel.
Remove the three screws C attaching the audio
board 1,2 and 3.
Disconnect the audio board 1,2 and 3 from the audio
board respectively.
Disconnect the harnesses from connector CN815 on
the regulator board.
Disconnect the card wire from connector CN831 on
the audio board.
Remove the two screws G attaching the audio
board.
1.
2.
3.
4.
5.
Fig.13
Fig.14
Fig.15
Fig.16
Regulator board Video board Audio board 3
Audio board 2
Audio board 1
Audio board 1
Audio board 2 Audio board 3
Audio board
Audio board
CN831
CN815
Rear panel
CN711 CN701
C
C
C
G
C
CN831

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Prior to performing the following procedure, remove
the top cover and the DVD mechanism assembly.
Removing the DVD servo board
(See Fig.17)
Turn over the DVD mechanism assembly and
disconnect the card wire from connector CN102 and
CN103 on the DVD servo board.
Remove the two screws H attaching the DVD servo
board. Move the DVD servo board in the direction of
the arrow to release the two corner joints d.
1.
2.
Removing the FL board / the power
switch board (See Fig.18 and 19)
Prior to performing the following procedure, remove
the top cover and the front panel assembly.
Remove the eight screws I and three screws J on
the back of the front panel assembly. Remove the FL
board and the power switch board at the same time.
Disconnect the harness from connector CN903 on
the FL board.
1.
2.
<Front panel assembly>
Fig.17
Fig.18
Fig.19
DVD mechanism board
CN103
Joint d Joint d
CN102
DVD servo board
FL board
Power switch board
Power switch board CN903 FL board
H
II
II
J
J
H

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Laser current conversion table
Adjustment method
This model has the TEST mode for simple diagnosis of the internal function.Use the TEST mode for diagnosing and checking
the set as mentioned below.
Details of theTEST mode
The TEST mode comprises the five modes of the following. FL indication (*: numeral)
1.DVD AUDIO copyright protection key serial indication
********
Indicates the content of the DVD AUDIO copyright at shipment. Use this mode for checking it.
2.Microcomputer's version number indication **_**_**
Indicates the initial version number of the microcomputer at shipment. Use this mode for checking it.
3.Servo signal system check mode CHECK
Use this mode for checking the laser pickup status.
4.Indication check mode The FL and LED's go on in full.
The LED's and FL of the set go on in full. Use this mode for checking indications.
5.Microcomputer software upgrading mode UPGRADE
Use this mode for upgrading the microcomputer software.
How to set theTEST mode
1.While pressing the STOP key and PLAY key of the set together, plug in the power cord.
*Continue to pressing both the STOP key and PLAY key until reading of disk data completes (until the "NOW READING"
message changes into a DVD logo).
2."TEST *" message appears on the FL. (* In the part of the sign, the sign is different according to the destination.)
3.The five modes of theTEST mode change one after another each time the DISPLAY OFF key of the set is pressed.
4.To recover the usual operation mode, turn off the set by pressing the POWER ON/OFF key.
How to check the laser pickup
Since the laser pickup of the set is easily affected by static electricity, heat, etc., it may be damaged depending on use
condition. If the set shows such a symptom as it fails in reading disk data, check the laser pickup as follows.
* Checking laser current
1.Enter the set into the "servo signal system check mode" of the TEST mode.
2.Press the SKIP | key of the set.
The laser is turned on and the LAS **** message appears on the FL display. **** in the message indicates the current
in code.For knowing the actual laser current, read the first two figures (omitting the last two figures) and convert the
number into the current (mA) referring to the following conversion table, because the FL indication is a hexadecimal
number. Since the FL indication varies because of self-heating of the set, read the indication value about 20 seconds
after the set was turned on. If the indicated value is the OK level (see the conversion table), the laser is judged to be
normal in the initial status by this simple checking method.
3. Press the STOP key to set back the check mode to the initial status.
FL indication
Current (mA) Judgment
FL indication
Current (mA) Judgment
FL indication
Current (mA) Judgment

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* Automatic adjustment/Jitter value indication
1.Enter the set into the "servo signal system check mode" of the TEST mode.
2.Open the tray with the OPEN key of the set.Set the TEST disk VT-501 on the tray and put back the tray with
the CLOSE key.Then, press the PAUSE key.
The TEST disk starts rotation to execute automatic adjustment. If the set is in the normal condition, the
"CHECK OK" message appears.If there is something abnormal in the adjustment values, an error message
appears and it mostly comes from a failure in the servo system (including the mechanism and pickup).In
such the event, refer to the check points by errors.
When using the TEST disk VT-501, carefully check to see if there is neither damage nor dirt on the read
surface of the disk beforehand.
3.Press the STOP key to return the check mode to the initial status.
4.After the automatic adjustment with the TEST disk completes, press the PLAY key.
The disk starts rotation and a jitter value (signal read precision in percentage) appears on the FL display (JIT
0***). If the indication value (in *** places) is 110 (11 %) or less, it can be judged by this simple checking
method that the signal read precision of the set is satisfactory.
Before using the TEST disk VT-501, carefully check it if there is neither damage nor dirt on the read surface.
5.Press the STOP key to return the mode to the initial status.
Upgrading microcomputer software
The internally incorporated microcomputer software of this set can be revised in part for the reason that the set
is designed to conform to new standards and to be capable of playing disks to be put on the market by other
manufacturers.To upgrade the internal microcomputer software, use the upgrade disk and follow the procedure
mentioned below.
* How to upgrade the microcomputer software
1.Set the upgrade disk in the set and enter it into theTEST mode.
2.After confirming that the set completes reading of the upgrade disk data while looking at the indication on the
monitor screen, change the TEST mode to the microcomputer software upgrading mode and then press the
PLAY key.
3.The set completes writing of the upgrade disk data approximately 1 minute later and it is automatically reset
by the self-resetting function.Then the set again reads the upgrade disk and stops automatically.
4.Take the upgrade disk out of the set and turn it off with the POWER ON/OFF key.
5.Again enter the set into the TEST mode, and press the SKIP key and then the PAUSE key.
6.Make sure that the DVD AUDIO indicator goes on a few seconds after the above-mentioned operation, check
the version number of the microcomputer software in the microcomputer software version number indication
mode.
*Carefully carry out the above procedure. If data write is interrupted in the middle of course by power failure
or careless shutdown operation, not only the data of the internal software may be damaged but the set may
fail in resetting.The version number of the internal microcomputer software is shown as follows.
FL indication: ** ** **
[IC901] [IC401] [IC508/IC509] Symbol number of microcomputer IC
Initializing the set
Initialization of the set returns it to the initial status at shipment.
Be sure to initialize the set after repair service.
* How to initialize the set
1.Enter the set into the TEST mode and press the SKIP key first and the PAUSE key second.
2.Make sure that the DVD AUDIO indicator goes on a few seconds later.
DVD AUDIO copyright protection
To protect the DVD AUDIO copyright from infringement, a number proper to each DVD AUDIO set called a
device key is assigned to each set. If a proper device key is not set for a set, it fails in playing a copyrighted
disk.
The management number of the device key of a set can be checked by the DVD AUDIO copyright protection
key serial indication in the TEST mode.If the "???...." message appears in this check mode, the set has a
failure in the device key. If it occurs, inquire at the Service Section of the Audio and Communication Division,
JVC.

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Check points for each error
(1) Spindle start error
*Defective spindle motor
Are there 10ohms resistance between each pin of CN102 "1~4"?
(The power supply is turned off and measured.)
*Hall element: Is sine wave output between CN102 "10" and "11", between "12" and "13",
and between "14" and "15" during rotation?
In either case, replace the mechanical unit.
*Defective spindle driver (IC251)
Is a driving wave output from CN102 "1~4" ?
Is IC251 "9" at "H" level (START)?
Servo IC --- Is control signal sent to the motor driver ?
IC201 "95" : Duty is 50% during stop, but varies during rotation (greatly varies at start).
--- If not sent, pattern or servo IC (IC201) is defective.
R259 : approx 2.5V during stop, but varies during rotation (greatly varies at start).
--- of not sent, pattern or servo IC (IC201) is defective.
Is FG input to servo IC ?
Observe FG wave from IC201 "89". --- If not output, pattern, IC251 or IC201 is defective.
During
rotation
(2) Disc Detection, Distinction error (no disc, no REFNV)
* Laser is defective.
* Front End Processor is defective (IC101).
* APC circuit is defective. --- Q101.
* Pattern is defective. --- Lines for CN101 "15" and "17".
Lines for between IC201 "2" and IC101 "2"(LDONA),
between IC201 "3" and IC101 "1" (LDONB).
* Servo IC is defective (IC201).
* Is signal sent to IC201(servo)"71" AS2 ?
* IC101 --- For signal from IC101 to IC301, is signal output from IC101 "88" (RFAS1) and
IC101 "69" REENV ?

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50msec
Approx.
500mV GND
2.5V
(3) Traverse movement NG
* For automatic adjustment, traverse movement occurs only when the position is changed to retry
judging the disc type after the 1st judgment resulted in an error. Therefore, traverse movement
rarely occurs because, in most cases, disc judgment at the current position (1st time judgment)
is executed successfully. (Of course, NG rarely occurs in this step.)
Note: 1st time judgment of disc type resulted in NG. --- The re-judgment of disc type may not be
successful. Therefore, after removing the cause of traverse movement, re-execute automatic
adjustment and confirm that no problem exists.
* Check point
a) During stop
Whether 50% duty pulse is output to R273
Whether between R274 and C271 is at approx. 2.5VDC
Offset voltage between CN102 "1" and "2" (scores mV if exists)
b) When tray is opened or closed
Check by oscilloscope whether a rectangular wave signal is output from CN102 "1" or "2".
If checking a) or b) resulted in NG, IC201 maybe defective.
(4) Focus ON NG
* Is FE output ? --- Pattern, IC101
* Is FCDRV signal sent ? (R286) --- Pattern, IC301
* Is driving voltage sent ?
CN101 "1", "3" --- If NG, pattern, driver, mechanical unit (with the power turned off, measure the
resistance between CN101 "20" and "21").
* Does CN101 "8" become "H" and is the focus drawing in done?
--- Mechanical unit (laser power too low), IC101(defective gain)
--- Moreover, It is thought that abnormality is found in the disk.
* Mechanical unit is defective.
(5) Tracking ON NG
* When the tracking loop cannot be drawn in, IC201 "58" (/TRON) does not become "L".
* Mechanical unit is defective.
Because the undermentioned adjustment value is abnormal, it is not possible to draw in normally.
* Periphery of driver (IC271)
Constant or IC it self is defective.
(When passing without becoming abnormal while adjusting the following.)
* Servo IC (IC201)
When improperly adjusted due to defective IC.
[Focus position rough adjustment]
[Phase difference cancellation rough adjustment]
[Tracking balance adjustment]

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(6) Spindle CLV NG
* When the spindle cannot be shifted to CLV Servo, does not become "H" between IC201 "18"
and IC301"88".
* IC201 Is signal output from IC101 "87" (RFOP)?
* IC201 Is signal output from IC201 "60" to "64" (binary-coded clock and data)?
* IC201 Is "58" (/TRON) at "L" level ?
* IC301 "74" to "76" --- Is signal output to IC201 "24", "25", "28" (In case of only CD).
(Serial communication of rotation information)
* Spindle motor driver is defective.
Even when one of the three phases is defective, item (1) may be passed.
--- Check the second item in (1) above.
* C260 to C263 Defective soldering
If noise eliminating capacitors are not properly soldered, noise may ride on the waveform.
* Besides, the undermentioned cause is thought though specific of the cause is difficult because various
factors are thought.
Mechanism is defective.(jitter)
IC101, IC201.
* Besides, the undermentioned cause is thought though specific of the cause is difficult because various
factors are thought.
Mechanism is defective. (jitter)
IC201, IC301, IC401.
The disc is dirty or the wound has adhered.
(7) Address read NG
(8) Between layers jump NG (double-layer disc only)
* When the focus flight is generated when jumps between layers.
Because all adjustments for L1 layer must be successful, this error may rarely be due to a
circuit defect.
* Crosstalk might occur from tracking to focus system. (See (11) ) --- Replace the mechanical unit.
* Driver surroundings.
* Defect of constant and IC.
* For double-layer discs, after checking CLV on layer L1, jumps to layer L0 after mode changes to FG.
Then tracking is turned off, and adjustments are executed from the focus position coarse adjustment
in order.
* When the jump between layers is done on the single-layer disk, the disk distinction error is thought.
--- The laser power is low (RF level is confirmed by IC101"87" (RFOP)).
--- AS1, AS2, REFNV Is the signal sent to between IC101 and IC201 ?

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Long-distance seek
Feed
Tracking
Hold (DC) during feed
Acceleration pulse at start;
deceleration pulse at stop
(each one)
(In the direction of search,
opposite to this figure)
Kick pulse (fine seek) is
inserted after long-
distance seek.
(Not one)
Kick pulse
Approx.
2.5V
(9) Neither picture nor sound is output
* Cannot search
a) Can the feed system be driven?
Check the waveform of TRSDRV signal (R273). --- Waveform between R274 and C271.
Search results in a change of duty
(three values with 2.5V at the center)
(The figure is exaggerated.)
Check the waveform of CN101 "1" and "2". --- After the driver (IC271)
b) Is kick available?
Check theTRDRV signal waveform from R289.
Check the waveform of CN101 "2" and "4" --- After the driver (IC271)
Although differs in amplitude and DC offset, the waveform is similar to that of R289
For short-distance search, the waveform
becomes roundish, not trapezoidal, and
voltage is low.

1-17
XV-D721BK
XV-D723GD
(10) Picture is distorted or abnormal sound occurs at intervals of several seconds.
Does JITOUT
change periodically?
(2V or more in peak
value, except
during kick)
NO
YES
Some system other
than servo may be
defective.
Feed system is defective (drive gain is defective: too large).
Check the waveform according to a) in (9).
Play back a simple disc with no angle change.
OK when the following waveform appears at intervals
of several seconds.
5~10Sec.
1~1.2V
If this voltage is too
high (2V or more, for
example), feed motor
may be defective, or
the mechanical unit
has seized.
(11) Others (unusual events experienced to date)
(13) Others
* Problem occurs with double-layer discs although no problem occurs with single-layer DVD.
(Error occurs, or search becomes unstable and takes longer.)
Crosstalk might occur from tracking to focus system.
--- When FE was observed during search (skip, etc.), it was found that a wave resembling TE
with an amplitude of 200mVp-p was riding on FE.
--- Mechanical unit was replaced.
* Error frequently occurred in the outer part of discs although no error occurred in the inner part.
--- Mechanical unit was replaced because tilt seemed to be defective.
V-CD : Frequent occurrence of error in inside and outer.
(Even the disk without the wound : when generated.)
Waveform observation
--- Is the oscillation frequency of about 700~900Hz output?
(Borrow a pertinent disk for the complaint for the combination with the disk.)
--- Exchanges mechanism for the mechanism resonance.
(12) CD During normal playback operation
a) Is TOC reading normal?
Displays total time
for CD-DA.
Shifts to double-speed
mode for V-CD.
b)Playback possible?
Please refer to "Servo Volume" flow.
*--:-- is displayed during FL serch.
According to [*Cannot serch ] for DVD(9), check the feed
and tracking systems.
*No sound is output although the time is displayed.(CA-DA)
*DAC, etc, other than servo.
*The passage of time is not stable, or picture is abnormal.(V-CD)
*The wound of the disc and dirt are confirmed.
NO
NO
YES

1-18
XV-D721BK
XV-D723GD
1.Pin layout
2.Block diagram
AN8706FHQ (IC101) : Front end processor
AN8706FHQ
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
CBDOFS
RBCA
TESTSG
RFINP
RFINN
VCC2
GND2
VREF2
COFTFS
COFTSL
RFON
RFOP
TS
DCRF
FS
VIN6
VIN5
VCC1
VIN1
VIN2
VIN3
VIN4
VREF4
DIFP
DIFN
CBDOSL CSAG DCAGC AGCG PEAK BOTTOM RFENV FC BOOST OFTR BDO JITOUT GND3 FUPDN ITDLI VCOIN PLFLT PLFLT2 FCPO PCPO VCC3 CAPA DTRD IDGT VCC5
RDCKP
RDCKN
RDTP
RDTN
GND5
GND4
VCC4
DTMONN
DTMONP
DSLFLT
DSLO
FLTOUT
DCFLT
VREF3
VPWBDO
VPWOFT
IDDLY
DBAL
GND1
VREF1
TKCNT
TKCFLT
TEOUT
TEI
RSCL
LDONB LDONA
LPCOA
LPC1
VHARF
TGBAL
POFLT
PTH
TBAL
TG
FGCTL
FBAL
FEOUT
FEN
VREFL
VREFC VREFH
PULIN
SEN SCK
STDI
STNBY
XTRON
MTRON
ROMRAM
FE(SSD)
FE BAL
TE(DPD)
TE BAL
TG(DPD)
LPC(Amp) VREF reg
MU
BDO Det
RF ENV
AGC EQ
OFTR Det
INTERFACE
DSL
PLL
DFLTOP/NRFENV
RFIN
TGTETKCNTTBALFBALFE
Head Amp.
SSD Signal
Head Amp.
DPD Signal
FC/Boost
AGC Cont
RFOUT
FS/TS
JITTER Det
DSLOUT
JITOUT
BDO
OFTR
CLK
DATA
SYNC
TKCNT
OPTICAL HEAD
(650nm) TGBAL CPU STNBY MTRON
SERVO PROCESSOR
Head Amp.
Description of major ICs

1-19
XV-D721BK
XV-D723GD
PinNo. Symbol I/O Functions
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
I
I
O
I
O
I
O
I
I
O
I
I
O
I
O
O
O
I
I
I
I
I
I
I
I
O
I
O
O
O
O
O
I
I
I
I
O
O
O
O
O
O
O
I
O
O
O
O
O
O
LDONB
LDONA
LPCOA
LPC1
VHARF
TGBAL
POFLT
PTH
TBAL
TG
FGCTL
FBAL
FEOUT
FEN
VREFL
VREFC
VREFH
PULIN
SEN
SCK
STDI
STNBY
XTRON
MTRON
ROMRAM
RSCL
TEI
TEOUT
TKCFLT
TKCNT
VREF1
GND1
DBAL
IDDLY
VPWOFT
VPWBDO
VREF3
DCFLT
FLTOUT
DSLO
DSLFLT
DTMONP
DTMONN
VCC4
GND4
GND5
RDTN
RDTP
RDCKN
RDCKP
Laser ON (CD Head) terminal
Laser ON (DVD Head) terminal
Laser drive output terminal
Laser PIN input terminal
VHALF voltage output terminal
Tangential phase balance control terminal
Track detectionThreshold value level terminal
Track detection Threshold value level terminal
Tracking balance control terminal
Tangential phase error signal output terminal
Focus amplifier Gain control terminal
Focus balance control terminal
Focus error signal output terminal
Focus error output amplifier reversing input terminal
VREFL voltage output terminal
VREFC voltage output terminal
VREFH voltage output terminal
DSL,PLL drawing mode switch terminal
SEN(Cereal data input terminal)
SCK(Cereal data input terminal)
STDI(Cereal data input terminal)
Standby mode control terminal
Tracking OFF holding input terminal
Monitor output ON/OFF switch terminal
ROM RAM switch terminal
Standard current source terminal
Tracking error output Amp reversing input terminal
Tracking error signal output terminal
Track count detection filter terminal
Track count output terminal
VREF1 voltage output terminal
Earth terminal 1
Data slice offset adjustment terminal
Data slice delay adjustment terminal
OFTR detection level setting terminal
BDO detection level setting terminal
VREF3 voltage output terminal
Capacity connection terminal for data slice input filter
Filter amplifier output terminal
Data slice single data output terminal
Constant filter terminal when data is sliceddelly
PLL differential motion 2 making to value edge signal moniter output (+)
PLL differential motion 2 making to value edge signal moniter output (-)
Power terminal 4 (5V)
Earth terminal 4
Earth terminal 5
PLL differential motion making to synchronization RF signal reversing output
PLL differential motion making to synchronization RF signal rotation output
PLL differential motion making synchronization clock reversing output
PLL differential motion making synchronization clock rotation output
3.Pin function AN8706FHQ (1/2)

1-20
XV-D721BK
XV-D723GD
I/OPin No. Symbol Functions
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
I
I
I
I
I
O
O
O
O
I
O
I
O
O
O
O
I
I
O
O
O
O
O
O
O
O
O
I
I
I
I
O
O
O
O
O
O
O
O
O
I
I
I
I
I
I
I
O
O
O
VCC5
IDGT
DTRD
CAPA
VCC3
PCPO
FCPO
PLFLT2
PLFLT
VCOIN
ITDLI
FUPDN
GND3
JITOUT
BDO
OFTR
BOOST
FC
RFENV
BOTTOM
PEAK
AGCG
DCAGC
CSAG
CBDOSL
CBDOFS
RBCA
TESTSG
RFINP
RFINN
VCC2
GND2
VREF2
COFTFS
COFTFL
RFON
RFOP
TS
DCRF
FS
VIN6
VIN5
VCC1
VIN1
VIN2
VIN3
VIN4
VREF4
DIFP
DIFN
Power terminal 5 (3.3V)
Data slice part address part gate signal input terminal (For RAM)
Data slice data read signal input terminal(For RAM)
Data slice CAPA(Address)signal input terminal (For RAM)
Power terminal 3 (5V)
PLL phase gain set terminal
PLL frequency gain set terminal
PLL low region filter terminal
PLL high region filter terminal
PLL VCO input terminal
PLL jitter free current ripple removal filter terminal
PLL frequency control input terminal
Earth terminal 3
Detection signal output of jitter
BDO output terminal
OFTR output terminal
Booth control terminal for filter
FC control terminal for filter
RF enve output terminal
Bottom enve detection filter terminal
Peak enve detection filter terminal
AGC amplifier gain control terminal
AGC amp filter terminal
Sag cancellation circuit filter terminal
BDO detection capacitor terminal
BDO detection capacitor terminal
BCA detection level setting terminal
TEST signal input terminal
RF signal positive moving input terminal
RF signal reversing input terminal
Power terminal 2 (5V)
Earth terminal 2
VREF2 voltage output terminal
OFTR detection capacitor terminal
OFTR detection capacitor terminal
RF signal output terminal P
RF signal output terminal N
All addition amplifier (DVD) output terminal
All addition amplifier capacitor terminal
All addition amplifier (CD) output terminal
Focus input of external division into two terminal
Focus input of external division into two terminal
Power terminal 1 (5V)
External division into four (DVD/CD) RF input terminal 1
External division into four (DVD/CD) RF input terminal 2
External division into four (DVD/CD) RF input terminal 3
External division into four (DVD/CD) RF input terminal 4
VREF4 voltage output terminal
RF signal (RAM) output terminal P
RF signal (RAM) output terminal N
AN8706FHQ(2/2)