Some illustrations using in this service manual are slightly different from the actual set.
14-14, AKASAKA 4-CHOME, MINATO-KU, TOKYO 107-8011 JAPAN
Telephone: 03 (3584) 8111
X0124 205 NC 0110
DVM-4800
SPECIFICATIONS
Signal system:NTSC
Applicable discs:(1) DVD-video/audio discs
1-layer 12 cm single-sided discs, 2-layer 12 cm single-sided discs,
2-layer 12 cm double-sided discs (1 layer per side)
1-layer 8 cm single-sided discs, 2-layer 8 cm single-sided discs,
2-layer 8 cm double-sided discs (1 layer per side)
• DVDs (linear PCM): 2 Hz to 22 kHz (48 kHz sampling)
: 2 Hz to 44 kHz (96 kHz sampling)
: 2 Hz to 88 kHz (192 kHz sampling)
• CDs: 2 Hz to 20 kHz
(2) S/N ratio
• DVDs: 115 dB
• CDs: 115 dB
(3) Total harmonic distortion
• DVDs: 0.0025 %
• CDs: 0.0030 %
(4) Dynamic range
• DVDs: 108 dB
• CDs: 100 dB
Digital audio output:Optical digital output:Optical connector, 1 set
Coaxial digital output:Pin jack, 1 set
Power supply:AC 120 V, 60 Hz
Power consumption:22 W
Maximum external
dimensions:434 (width) x 131 (height) x 415 (depth) mm (not including protruding parts)
Mass:7.2 kg
■ Remote Control Unit:RC-548
Type:Infrared pulse
Power Supply:DC 3 V, two batteries ("AAA" (R03))
2
DVM-4800
3
DVM-4800
1.COUNTERMEASURES AGAINST ELECTROSTATIC DISCHARGE (ESD)
The laser diode in the traverse unit (laser pickup) may be damaged by static electricity charged in your cloth or body. Be
careful not to damage it by ESD when handling for servicing.
1.1Grounding for Electrostatic Breakdown Prevention
Components using an optical pickup (laser diode) such as DVD players etc. are liable to breakdown by static electricity under
the working environment.
Perform repair work in the working condition having proper grounding for preventing static electricity.
1.1.1 Work table grounding
Put a conductive material (sheet) or steel sheet on the area where the optical pickup is placed and ground the sheet.
1.1.2 Human body grounding
Use an anti-static wrist strap to discharge the static electricity from your body.
1.1.3 Handling of optical pickup
1) The optical pickup for spare parts is supplied with its laser diode shorted to ensure quality during transportation.
After the parts replacement, return to normal by proper procedures. (refer to the pages related)
2) Do not use a tester or etc. for checking the laser diode since the laser diode may be damaged easily by the voltage
of the tester inside battery.
Wrist strap
(Anti-static bracelet)
Iron plate or some metals
to conduct electricity
1.2Handling of Traverse Unit (laser pickup)
1.2.1 Do not apply a strong shock to the traverse unit (laser pickup) since it is made of precise structure.
1.2.2 To prevent the breakdown of the laser diode, install the flexible cable after removing the short pin for preventing a
electrical charge. When removing or connecting the short pin, finish the job in as short time as possible.
Also, cut out the short land of the flexible cable using nippers and etc. after replacing the optical pickup. Refer to
TRAVERSE UNIT DISASSEMBLY” in this manual for the handling of the traverse unit.
1.2.3 Be careful not to apply excessive stress to the flexible board (FPC Board) since it may cause cutting.
1.2.4 Do not turn the variable resistor of the laser power since it is not adjustable.
4
DVM-4800
2.OPTICAL PICKUP SELF-DIAGNOSIS AND REPLACEMENT
PROCEDURE
2.1Self-diagnosis
The optical pickup self-diagnosis function and tilt adjustment check function have been included in this unit. When repairing,
use the following procedure for effective Self-diagnosis and tilt adjustment. Be sure to use the self-diagnosis function before
replacing the optical pickup when "NO DISC" is displayed. As a guideline, you should replace the optical pickup when the
value of the laser drive current is more than 55.
Note:
Press the power button to turn on the power, and check the value within three minutes before the unit warms up.
(Otherwise, the result will be incorrect.)
"NO DISC" is displayed, unit does
not play smoothly, etc.
Use the optical pickup self-diagnosis function.
Method: With no disc in the player:
• Press the "DISPLAY" button on the
remote control unit while pressing the
Check the laser drive current.
"PAUSE" and "OPEN/CLOSE" buttons on
the player.
[Display content]
Value is 70 (DVD),
55 (CD) or less
Replace the optical pickup (Refer
to the section "OPTICAL PICKUP
REPLACEMENT PROCEDURE"
in this Guide.)
Check the laser drive current after
replacement.
Write the present value into the
unit if it is 60 (DVD), 45 (CD) or
less.
Do the optical pickup tilt adjustment. (Refer to the section "TILT
ADJUSTMENT" in this Guide.)
Value is more than
70 (DVD), 55 (CD)
Use the tilt
adjustment check
function.
Factory setting Present value
Replace with a new optical pickup if the present
value is more than 60 (DVD), 45 (CD).
Cause: Damage due to static electricity during
replacement.
Method: With no disc in the player:
• Press the "DISPLAY" button on the remote
control unit while pressing the "PAUSE" and
"OPEN/CLOSE" buttons on the player.
Write the present value
into the player if it is 45
or less.
Writing Method:
• Press the "PAUSE" button on the remote
control unit while pressing the "PAUSE" and
"OPEN/CLOSE" buttons on the player.
Initialize the player.
5
2.2Cautions to Be Used Before Replacing the Optical Pickup Unit
and Spindle Motor Assembly
Before replacing the optical pickup unit and spindle motor assembly, check the total using hours for each of them.
The checking method is as follow:
Operating state & Key operationDisplay
Using hours of CD laserPress "PAUSE, FWD-SKIP" and "5" on theT1_xxxx_yyyy: total hours are
remote control in this order while the unitdisplayed by 4-digit figures (unit: 10 hours).
is stoppedyyyy: CD laser Time
Using hours of DVD laser Press "PAUSE, FWD-SKIP" and "5" on theT1_xxxx_yyyy: total hours are
remote control in this order while the unitdisplayed by 4-digit figures (unit: 10 hours).
is stoppedxxxx: DVD laser Time
Using hours of SP motor Press "PAUSE, FWD-SKIP" and "6" on theT2_xxxx: total hours are
remote control in this order while the unitdisplayed by 4-digit figures
is stopped (unit: 10 hours).
Resetting using hoursWhile displaying Timer 1 data, press STOPT1_0000_0000
of CD and DVD lasersand FWD-SKIP buttons on the player, and
(Simultaneous resetting) "5" button on the remote control unit
Resetting using hoursWhile displaying Timer 2 data, press STOPT2_0000
of the motorand FWD-SKIP buttons on the player, and
"6" button on the remote control unit
DVM-4800
Cautions to be taken when replacing the optical pickup
The optical pickup may break down due to the static electricity of human body. Take proper protection measures against static
electricity before repairing the parts around the optical pickup. (See the page describing the PREVENTION OF STATIC
ELECTRICITY DISCHARGE.)
1. Do not touch the areas around the laser diode and actuator.
2. Do not judge the laser diode with a tester. (The tester will be damaged easily.)
3. It is recommended to use a destaticized soldering iron for short-circuiting or removing the laser diode.
(Recommended soldering iron) HAKKO ESD Product.
4. Solder the land of the flexible cable in the optical pickup.
Note:
• When using a soldering iron which is not destaticized, short-circuit the terminal face of the flexible case with a clip.
After that, short-circuit the land.
• After the repairing work is completed, remove the solder according to the correct procedure shown in this Technical
Guide.
Optical pickup unit
Flexible cable
Ground with a clip.
6
3.SELF-DIAGNOSIS FUNCTION AND SERVICE MODES
3.1Self-diagnosis Function and Service Modes
Improving the self-diagnosis function
The self-diagnosis function in our DVD player currently in use is improved as follows:
DVM-4800
Our DVD player currently
in use
UHF error display
The latest error storage
function
n=1
Jitter/read error display
Laser drive current display
For DVD
Our new DVD
UHF error display
The latest error storage
n=20
Jitter/read error display
Focus drive value display
laser drive current display
For DVD/CD
ADSC internal RAM data
display
Servo process display
Total operation time
display SP motor
Laser (DVD/CD)
The storage capacity is increased.
The focus drive current value can be displayed.
The servo learning value stored in the RAM data
inside the ADSC (servo controller) IC is displayed.
Mainly in the initial starting operation period of the
player, a number is allotted to the servo process
of each step, and the process of the starting
operation can be displayed.
The operation times of SP motor and the laser
(both for the DVD and CD) can be displayed.
7
3.2Service mode table
Pressing various button combinations on the player and remote control unit can activate the service modes.
DVM-4800
Item
Jitter checkIn PLAY mode, pressJitter checkJ_xxx_yyy_zzPress STOP
Error codeIn ** mode, press PAUSE Error code checkError code (play_err) is expressed Cancelled
checkand OPEN buttons on the The latest error code stored inin the following convention.automatically
Initial settingIn STOP mode, pressInitial setting of laser drive currentLDO_034_028Cancelled
of laser drivePAUSE and OPEN buttons lnitial current value for each of DVD
currenton the player, and PAUSE laser and CD laser is separately
DVD laserIn STOP mode, pressDVD laser drive current measurement LDD_034_032Cancelled
drive currentPAUSE and OPEN buttons DVD laser drive current is measuredMeasured currentautomatically
measurement on the player, andand the result is displayed together
ADSC internal In ** mode, press PAUSE ADSC internal RAM data checkA_DFA_6901Press STOP
RAM dataand OPEN buttons on the ADSC internal RAM data is read out
checkplayer, and RETURNand displayed. Address
Servo process In STOP mode, pressServo process displayTurn off the
displayPAUSE and FWD-SKIPThe servo process from STOP toprimary power.
button combinationmethod
PAUSE and OPEN buttons Jitter rate is measured and displayed.Focus drive valueor OPEN button.
on the player, and "5"Measurement is repeatedly done inRead error counter
button on the remotethe cycle of one second. Read errorJitter rate
control unit.counter starts from zero upon modeJitter check mode
setting, When target block data failed
to be read out, the counter advancesJitter rate is shown in decimal
by one increment. When the failure isnotation to one place of decimal.
caused by minor error, it may beFocus drive value is shown in
corrected when retried to enablehexadecimal notation.
successful reading. In this case, the
counter advances by one. When the
error persists even after retry, the
counter may jump by two or more.
player, and "0" button onEEPROM is displayed.
the remote control unit.
* With pointing of cursor
up and down on diaplay,
panel controller switches* "nn" denotes the serial number
the serial number ofof history.
history and sends out the
command accordingly.
button on the remotesaved in EEPROM.
control unit.
DISPLAY button on thewith the initial value stored in
remote control unit.EEPROM.
After the measurement, DVD laserThe value denotes the current in
emission is kept on. It is turned offdecimal notation. The above
when POWER key is switched off. (Itexample shows the initial current
is also turned off when the primaryis 34mA and the measured value
power is switched off.)is 32mA.
button on the remoteChange the address with CLEAR key
control unit.operation to show the data for 11
addresses.The value is shown in hexadecimal
buttons on the player, and ACCESS is displayed.
"7" button on the remote
control unit.
FunctionDisplay
Error code=0 x DAXX is expressed: ➔ nn UXX
Error code=0 x DBXX is expressed: ➔ nn HXX
Error code=0 x DXXX is expressed: ➔ nn FXX
Error code=0 x 0000 is expressed: ➔ nn F--
DVD laser current measurement
Laser current measurement mode
The value denotes the current in
decimal notation. The above
example shows the initial current
is 34mA and 28mA for DVD laser
and CD laser respectively when
the laser is switched on.
Initial current stored in EEPROM
DVD laser current measurement mode
ADSC internal RAM data check mode
notation. The above example
shows the data in ADSC address
DFAh is 6901h.
CD laser current measurement
RAM data for specified address
Player mode and
Cancellation
5 seconds later.
automatically
5 seconds later.
5 seconds later.
or OPEN button.
8
DVM-4800
Item
CD laser drive In STOP mode, pressCD laser drive current measurementLDC_028_026
currentPAUSE and FWD-SKIPCD laser drive current is measured
measurement buttons on the player, and and the result is displayed together
VersionIn STOP mode, pressVersion displaysrrr_xyzzzCancelled
displayPAUSE and OPEN buttons
Lighting ofIn ** mode, pressLighting of display tubePress STOP
display tubePAUSE and OPEN buttonsor OPEN button.
Dealer's lockIn STOP mode, pressDealer's lock"LOCKED" sign appears whenRepeat the
Region display In STOP mode, pressRegion displayx_yy_zzzCancelled
button combinationmethod
DISPLAY button on thewith the initial value stored in
remote control unit.EEPROM.
After the measurement, CD laserThe value denotes the current in
emission is kept on. It is turned offdecimal notation
when POWER key is switched off. (ItThe above example shows the
is also turned off when the primaryinitial current is 28mA and the
power is switched off.)measured value is 26mA.
on the player, and "7"
button on the remote
control unit.
on the player, and "9"
button on the remote
control unit.
STOP button on theThe lock is switched ON or OFF.dealer's lock is switched on, orsame operation.
player, and POWER button When dealer's lock is ON, it prohibitswhen secondary power key or tray
on the remote control unit. switching off of the secondary poweropening key is pressed while the
and tray opening.lock is on.
When the lock is switched, its ON/OFF "UNLOCKED" sign appears when
status is stored in EEPROM.dealer's lock is switched off.
PAUSE, BWD-SKIP andUser settings are cancelled and player
OPEN buttons on theis initialized to factory setting.
player for 3 seconds or
longer.
PAUSE and OPEN buttonsN: NTSC/6: PAL60automatically
on the player, and "6"N: noPAL/P: PAL5 seconds later.
button on the remoteRegion No.
control unit.
FunctionDisplay
Measured current
Initial current stored in EEPROM
CD laser current measurement mode
System controller release number
System controller model number
System controller generation
Panel controller release number
Panel controller model number
Player mode and
Cancellation
automatically
5 seconds later.
Item
Timer 1 check In STOP mode, pressTimer 1 checkT1_1234_5678Cancelled
Timer 1 reset While displaying Timer 1Timer 1 resetT1_0000_0000Cancelled
Timer 2 check In STOP mode, pressTimer 2 checkT2_1234Cancelled
Timer 2 reset While displaying Timer 2Timer 2 resetT2_0000Cancelled
button combinationmethod
PAUSE and FWD-SKIPLaser operation timer Operation time is
buttons on the player, and measured separately for DVD laserand to the right CD laser time.5 seconds later.
"5" button on the remoteand CD laser.
control unit.notation in a unit of 10 hours.
data, press STOP andLaser operation timer Operation timeautomatically
FWD-SKIP buttons on the of both DVD laser and CD laser is5 seconds later.
player, and "5" button onreset all at once.
the remote control unit.
PAUSE and FWD-SKIPSpindle motor operation timer
buttons on the player, and
"6" button on the remotenotation in a unit of 10 hours.
control unit."0000" will follow "9999".
data, press STOP andSpindle motor operation timerautomatically
FWD-SKIP buttons on the5 seconds later.
player, and "6" button on
the remote control unit.
FunctionDisplay
Shown to the left is DVD laser time,
Time is shown in 4 digits of decimal
"0000" will follow "9999".
Time is shown in 4 digits of decimal
Player mode and
Cancellation
automatically
automatically
5 seconds later.
9
3.3Servo Process Flow
DVM-4800
Specification of the servo process
display in the starting flow
1 2 0 9
Servo process
that has stopped
(Restrictions)
All processes that are under operation
cannot be displayed due to the limit of
the processing time.
Servo process
that is under
operation
Starting flow
START
Initial setting
Tray control
TRV initial movement
Disc detection
Disc type distinction
Focus servo
Tracking servo
Range of the
servo process
numbers
0000Each initial setting
0101TRV initial movement
02~0802Initial setting in FE system
02~0802Initial setting in FE system
10~1312Focus ON
14~1515Tracking ON
Processing items
Contents of each processNumber
05Detecting LD ON HALF
08Detecting CD LD ON
13FBAL adjustment
Gain learning
ID read
1717Gain adjustment in ADSC
focus system
18~1A19DBAL/equalizer adjustment
1AID read
10
DVM-4800
3.4Servo Process Display Mode
In starting operation of the player, a number is allotted to each servo process so that the operation of each step can be seen.
The relation between the process and the displayed number are as follows:
Number allotment to the servo process
Process classificationEach processing itemDescriptionProcess number
Initial start processInitial startThe process starts after the tray is loaded. (The state0~40
is changed to "READY" or "PREPARE".)
Secondary learningServos for the DVD-DL 1st layer and the CD-DA double50~7F
Restart processRestartWhen a user operates in the "READY" state, each servo80~9F
Seek processSeekThe optical pickup is moved to the disc destination inA0~BF
Repair processRecover
(Error check)An error is searched in the PLAY/SEEK state.C1~C3
(Attention)An error is recovered following the attention errorC4~C6
(Q code read)If any Q code is improperly read, reset and retry.C7~C9
Stop processStopA servo is controlled in response to the user's operationF0~FF
speed are learned in this step.
is turned on.
this process.
interrupt from the S-ODC.
to stop the disc completely.
3.5ADSC Internal Ram Data Display
The servo learning value in the RAM data inside the servo processor ADSC is displayed.
The value is useful for the servo operation/disc quality judge including the OPU.
The concrete contents are shown below:
Address
Contents of display
4B4Focus gain learning value for DVD-S, DVD-D(L0), CD, and VCD
4BCFocus gain learning value for DVD-D(L1)
4B6Focus balance learning value for DVD-S, DVD-D(L0), CD, and VCD
4BEFocus balance learning value for DVD-D(L1)
4B5Tracking gain value for DVD-S, DVD-D(L0), CD, and VCD
4BDTracking gain value for DVD-D(L1)
TB0Tracking balance value for DVD-S, DVD-D(L0), CD, and VCD
TB1Tracking balance value for DVD-D(L1)
DBDDSL offset learning value for DVD-S and DVD-D
DBCDSL offset learning value for CD and VCD
FC0Equalizer FC value for DVD-S, DVD-D(L0), CD, and VCD
BT0Equalizer BOOST value for DVD-S, DVD-D(L0), CD, and VCD
FC1Equalizer FC value for DVD-D(L1)
BT1Equalizer BOOST value for DVD-D(L1)
11
DVM-4800
3.6Sales demonstration lock function
This function prevents discs from being lost when the unit is used for sales demonstrations by disabling the disc eject
function. "LOCKED" is displayed on the unit, and ordinary operation is disabled.
Setting
The sales demonstration lock is set by simultaneously pressing STOP button on the player and POWER button on the
remote control unit.
Cancellation
The lock can be cancelled by the same procedure as used in setting. ("UNLOCKED" is displayed on cancellation.
Disconnecting the power cable from power outlet does not cancel the lock.)
3.7Service Precautions
3.7.1 Recovery after the DVD player is repaired
When an FROM or an EEPROM in and on the module P.C.B. has replaced, carry out the recovery disc processing to
optimize the drive.
Playback the disc above to process the recovery automatically.
Recovery disc (Product number: RFKZD5TR001)
Note:
This unit requires no initialization process carried out after the traditional DVD players were repaired.
When the recovery measures are taken, the customer setting will return to the factory setting as same as the procedure
described in item of "Initialization" in 2.2 is carried out. Write down the contents of the setting before recovery processing,
and reset the player.
3.7.2 Firmware version-up of the DVD player
The firmware of the DVD player may be renewed to improve the quality including operationability and playerbility to the
substandard discs processing to optimize the drive.
The version-up disc has also a recovery function so that you don't need use the recovery disc again.
Note:
If the AC power supply is shut out during version-up due to a power failure, the version-up is improperly carried out.
In such a case, replace the FROM and carry out the version-up again.
The product number of the version-up disc will be noticed when it is supplied.
3.7.3 Initialization of DVD Player
Initialize the DVD player when replacing CPU and its peripheral parts, and Mother P.W.B., etc.
How to Initialize
Pressing the "STILL/PAUSE" + "SKIP REW" + "OPEN/CLOSE" buttons at once makes DVD player initialization (factory
setting condition). "INITIALIZED" is indicated on the screen and "INITIALIZE" on the display of the main unit.
Note
When the initialization has been made, the contents of user setting is lost.
Therefore, memorize the contents of user setting prior to the initialization and re-set them again after the initialization.
3.7.4 Setting after Repair
After finishing the repair work, follow the steps below.
Setting Condition
At the power on state,
1) Press the "OPEN/CLOSE" button to close the tray.
2) Turn the power off.
3) Unplug the power cord from the wall outlet.
Note
Do not close the tray manually after disconnecting the power cord from the wall outlet in tray open condition.
12
4.DISASSEMBLY
(Follow the procedure below in reverse order when reassembling)
DVM-4800
4.1Top Cover
Remove 4 screws 1 on both sides and 3 screws
on the rear, then detach the Top Cover as shown to
the arrow direction.
4.2Front Panel
(1) Remove 8 screws 3 from the top and bottom edges
of the Front Panel.
(2) Detach the Front Panel to the arrow direction,
together with its Inner Panel.
Top Cover
2
1
Connector
3
2
1
Flexible Wire
3
3
4.3Mother & Power P.W.B., Stay
(1) Remove 12 screws 4 to detach the Mother P.W.B.
(2) Remove 4 screws 5, to detach the Power P.W.B.
(3) Remove 4 screws
6
to detach 2 Stays.
Front Panel
Power P.W.B.
6
Stay
Flexible Wire
3
5
5
4
6
4
6
4
6
Mother P.W.B.
Stay
13
4.4Loader Frame Ass'y
Remove 2 screws 7 to detach 2 Side Plates, then pull
out the Loader Frame in the arrow direction.
Note: Draw out the Loader Frame 1 ~ 2 cm and
turn the power off, before performing this step.
DVM-4800
4.5DVD Mecha.
(1) Remove 5 screws 8 to detach the Rear Panel.
(2) Remove 4 screws 9 to detach the Clamp Base.
(3) Remove 4 fixed pin
Traverse Unit.
to detach the DVD
Side Plate
Rear Panel
7
Loader Frame
8
7
Side Plate
8
Clamp Base
9
9
8
DVD Traverse Unit
14
5.ADJUSTMENT PROCEDURES
5.1. Service Tools and Equipment
ApplicationNameNumber
Tilt adjustmentDVD test discDVDT-S15 or DVDT-S01
Hex wrench
InspectionExtension cable (module P.W.B. to mother P.W.B.)JGS0098
Extension cable (module P.W.B. to mother P.W.B.)VUC8026
Extension cable (module P.W.B. to mother P.W.B.)RFKZ0097
Extension cable (module P.W.B. to mother P.W.B.)VUC8026
OthersScrew lockRZZ0L01
GreaseRFKXGAK152
OilRFKXGA1280, JZS0648
ConfirmationCD test discPVCD-K06 or any other commercially
available disc
VCD test discPVCD-K06 or any other commercially
available disc
Recovery discRFKZD5TR001
5.2. Important points in adjustment
5.2.1. Important points in optical adjustment
· Before starting optical adjustment, be sure to take anti-static measures.
· Optical pickup tilt adjustment is needed after replacement of the following components.
1. Optical pickup unit
2. Spindle motor unit
3. Optical pickup peripheral parts (such as rail)
Notes
Adjustment is generally unnecessary after replacing other parts of the traverse unit. However, make adjustment if there is a
noticeable degradation in picture quality. Optical adjustments cannot be made inside the optical pickup. Adjustment is generally
unnecessary after replacing the traverse unit.
5.2.2. Important points in electrical adjustment
· Follow the adjustment procedures described in this Manual.
5.3. Storing and Handling Test Discs
· Surface precision is vital for DVD test discs. Be sure to store and handle them carefully.
1. Do not place discs directly onto the workbench, etc., after use.
2. Handle discs carefully in order to maintain their flatness. Place them into their case after use and store them vertically. Store
discs in a cool place where they are not exposed to direct sunlight or air from air conditioners.
3. Accurate adjustment will not be possible if the disc is warped when placed on a surface made of glass, etc. If this happens, use
a new test disc to make optical adjustments.
4. If adjustment is done using a warped disc, the adjustment will be incorrect and some discs will not be playable.
DVM-4800
15
5.4.1.1. Adjustment procedure
1. While pressing PAUSE and OPEN/CLOSE buttons on the
Tangential Adjust Screw
Tilt Adjust Screw 2
Tilt Adjust Screw 1
main unit, press "5" on the remote control unit.
2. Confirm that "J_xxx_yyy_zz" is shown on the front display.
For your information:
"yyy" and "zz" shown to the right have nothing to do with
the jitter value. "yyy" is the error counter, while "zz" is
the focus drive value.
Note:
Jitter value appears on the front display.
3. Play test disc T01 (inner periphery).
4. Adjust tangential adjustment screw so that the jitter value is
minimized.
5. Play test disc T43 (outer periphery).
6. Adjust tilt adjustment screw 1 so that the jitter value is
minimized.
7. Play test disc T43 (outer periphery).
8. Adjust tilt adjustment screw 2 so that the jitter value is
minimized.
9. Repeat adjusting tilt adjustment screws 1 and 2 alternately
until the jitter value is minimized.
5.4.1.2. Important points
1. Make tangential adjustment first, and then make tilt
adjustment.
2. Repeat adjusting two or three times to find the optimum
point.
3. Finish the procedure with tilt adjustment.
Jitter value depends on the model:
1. If the jitter value changes like B, the optimum point is easy to
find.
2. If the jitter value changes like A, set the optimum point near the
middle.
5.4.1.3. Check after adjustment
Play test disc or any other disc to make sure there is no picture
degradation in the inner, middle and outer peripheries, and no
audio skipping. After adjustment is finished, lock each
adjustment screw in position using screw lock.
5.4.1.4. Procedure for screw lock
1. After adjustment, remove top cover, tray, clamper base and
traverse unit in this sequence.
2. Lay the traverse unit upside down, and fix adjustment screw
with screw lock.
3. After fixing, reassemble traverse unit, clamper base, tray
and top cover.
5.4. Optical adjustment
5.4.1. Optical pickup tilt adjustment
Measurement pointAdjustment pointModeDisc
Tangential adjustment screw
Tilt adjustment screw
T01 (inner periphery) play
T43 (outer periphery) play
DVDR-S15 or DVDT-S01
Measuring equipmentAdjustment value
None (Main unit display for servicing is used.)Adjust to the minimum jitter value.
Front Side
DVM-4800
16
DVM-4800
Do this confirmation after replacing a P.W.B.
5.5.1. Video Output (Luminance Signal)
Adjustment
Measurement
Point
Adjustment
Point
ModeDisc
Video Output
Pin Terminal
GND: Chassis
VR3225Playback
(Color Bar)
DVDT-S20
(title 9)
Measuring DeviceAdjustment Value
Oscilloscope
500 mV/div, 10 µs/div
1000 ± 20mV p-p
For compatibility of video signal output.
1. Connect the monitor TV to the video output terminal and
terminate at 75 Ohms.
2. Play back the color bar part title 9 (DVDT-S20) of the DVD
Test Disc title.
3. Adjust the VR3225 so that the luminance signal output is as
shown below.
Adjustment Value = 100020 mV p-p
Fig. 5-5-1 Luminance Signal Output
5.5.2. Video Output (Chrominance
Signal) Adjustment
Measurement
Point
Adjustment
Point
ModeDisc
Video Output
Pin Terminal
GND: Chassis
VR3221Playback
(Color Bar)
DVDT-S20
(title 9)
Measuring DeviceAdjustment Value
Oscilloscope
500 mV/div, 10 µs/div
624 ± 12mV p-p
For compatibility of video signal output.
1. Connect the monitor TV to the video output terminal and
terminate at 75 Ohms.
2. Play back the color bar part title 9 (DVDT-S20) of the DVD
Test Disc title.
3. Adjust the VR3221 so that the chrominance (CYAN) signal
output is as shown below.
Adjustment Value = 62412 mV p-p
Fig. 5-5-2 Chrominance Signal Output
5.5. Electrical Adjustment
17
DVM-4800
5.5.3. Video Output (CB Signal)
Adjustment
Measurement
Point
Adjustment
Point
ModeDisc
CB Output Pin
Terminal
VR3201Playback
(Color Bar)
DVDT-S20
(title 9)
Measuring DeviceAdjustment Value
Oscilloscope
200 mV/div, 10 µs/div
486 ± 10mV p-p
NOTE:
CB/CR Output should be 75Ω terminate.
For compatibility of video signal output.
1. Connect the monitor TV to the video output terminal and
terminate at 75 Ohms.
2. Play back the color bar part title 9 (DVDT-S20) of the DVD
Test Disc title.
3. Adjust the VR3201 so that the CB signal output is as shown
below.
Adjustment Value = 48610 mV p-p
Fig. 5-5-3 CB Signal Output
5.5.4. Progressive Video Output
(Y Signal) Adjustment
Measurement
Point
Adjustment
Point
ModeDisc
Progressive
Terminal
GND: Chassis
VR3771Playback
(Color Bar)
DVDT-S20
(title 9)
Measuring DeviceAdjustment Value
Oscilloscope
200 mV/div, 5 µs/div
1000 ± 20mV p-p
NOTE:
Progressive Output should be 75Ω terminate.
For compatibility of video signal output.
1. Connect the monitor TV to the Y (Progressive) output
terminal and terminate at 75 Ohms.
2. Play back the color bar part title 9 (DVDT-S20) of the DVD
Test Disc title.
3. Adjust the VR3771 so that the Y (Progressive) signal output
is as shown below.
Adjustment Value = 100020 mV p-p
Fig. 5-5-4 Y Signal Output
18
5.5.5. Progressive Video Output
(PB Signal) Adjustment
Measurement
Point
Adjustment
Point
ModeDisc
Progressive
Terminal
VR3751Playback
(Color Bar)
DVDT-S20
(title 9)
Measuring DeviceAdjustment Value
Oscilloscope
100 mV/div, 5 µs/div
525 ± 10mV p-p
NOTE:
Progressive Output should be 75Ω terminate.
For compatibility of video signal output.
1. Connect the monitor TV to the video output terminal and
terminate at 75 Ohms.
2. Play back the color bar part title 9 (DVDT-S20) of the DVD
Test Disc title.
3. Adjust the VR3751 so that the PB signal output is as shown
below.
10OSC1XOIClock
11VSSGNDGND
12XIGNDINot used
13XONCONot used
14MMODGNDIMemory mode
15VREF-GNDIA/D reference L
16PA0KEYIN0IA/D key input
17PA1KEYIN1IA/D key input
18PA2KEYIN2IA/D key input
19PA3SWOPITray open detect, L: Open
20PA4SWCLITray close detect, L: Close
21PA5PA5IModel set jumper 1
22PA6PA6IModel set jumper 2
23PA7PA7IModel set jumper 3
24VREF+5VIA/D reference H
25P07POWERMUTOPower mute, H: Mute
26P27/RSTIReset
27P10SWDNIChucking down detect, L: Down
28P11SWUPIChucking up detect, L: Up
29P12OPENOTray open, H: Open
30P13CLOSEOTray close, H: Close
31P14ROULETTE-LORoulette left-turn, H: Left-turn
32P15ROULETTE-RORoulette right turn, H: Right turn
33P20 (IRQ0)REMIRemote-control input
34P21VSYNCIV-Sync (IRQ)
35P22W.REMINIWired remote-control input
36P23RFFIRFF
37P24R.SENSIRoulette sensor, H: detect slit
38P25D.SENSIDisc sensor, L: detect disc
39P30SDAOI2C SDA
40P31POWER-OFFOMain power control, L: On
Pin NameFunctionI/OSymbol
1P00ST-BY LEDOST-BY LED
2P01R-SPEEDORoulette rotation slow down, H: Down
3P02FL DRIVEOFL light off, L: Off
4P03CMDOSerial output
5P04STATUSISerial input
6P05DSPCLKISerial clock
7P06AUDIO ONLY LEDOAudio Only LED
8VDD5V+5V
9OSC2XIOClock