Denon DVM-4800 User manual
Digital Player
SERVICE MANUAL
MODEL
DVM-4800
DVD VIDEO AUTO CHANGER
For U.S.A. & Canada model
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
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TEL 13942296513 QQ 376315150 892498299
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2
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)
(2) Compact discs (CD-DA, Video CD)
12 cm discs, 8 cm discs
S-Video output: Y output level: 1 Vp-p (75 Ω/ohms) C output level: 0.286 Vp-p
Output connectors: S connectors, two sets
Video output: Output level: 1 Vp-p (75 W/ohms) Output connector: Pin-plug jacks, two sets
Component output: Y output level: 1 Vp-p (75 Ω/ohms)
CB/CRoutput level: 0.650 Vp-p (75 Ω/ohms) PB/PRoutput level: 0.700 Vp-p (75 Ω/ohms)
Output connector: Pin jack, 1 set
Audio output: Fixed output level: 2 Vrms (1 kHz, 0 dB)
Number of connectors: 1 set (2 ch mixed output)
1 set (6 ch discrete output)
Audio output properties: (1) Frequency response
• 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))
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TEL 13942296513 QQ 376315150 892498299
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4
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.
1.1 Grounding 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
1.2 Handling 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.
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TEL 13942296513 QQ 376315150 892498299
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5
DVM-4800
2. OPTICAL PICKUP SELF-DIAGNOSIS AND REPLACEMENT
PROCEDURE
2.1 Self-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.
Check the laser drive current.
Value is 70 (DVD),
55 (CD) or less
Value is more than
70 (DVD), 55 (CD)
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 adjust-
ment. (Refer to the section "TILT
ADJUSTMENT" in this Guide.)
Use the tilt
adjustment check
function.
Initialize the player.
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
"PAUSE" and "OPEN/CLOSE" buttons on
the player.
[Display content]
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.
Writing Method:
• Press the "PAUSE" 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.
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TEL 13942296513 QQ 376315150 892498299
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6
DVM-4800
2.2 Cautions 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 operation Display
Using hours of CD laser Press "PAUSE, FWD-SKIP" and "5" on the T1_xxxx_yyyy: total hours are
remote control in this order while the unit displayed by 4-digit figures (unit: 10 hours).
is stopped yyyy: CD laser Time
Using hours of DVD laser Press "PAUSE, FWD-SKIP" and "5" on the T1_xxxx_yyyy: total hours are
remote control in this order while the unit displayed by 4-digit figures (unit: 10 hours).
is stopped xxxx: DVD laser Time
Using hours of SP motor Press "PAUSE, FWD-SKIP" and "6" on the T2_xxxx: total hours are
remote control in this order while the unit displayed by 4-digit figures
is stopped (unit: 10 hours).
Resetting using hours While displaying Timer 1 data, press STOP T1_0000_0000
of CD and DVD lasers and FWD-SKIP buttons on the player, and
(Simultaneous resetting) "5" button on the remote control unit
Resetting using hours While displaying Timer 2 data, press STOP T2_0000
of the motor and FWD-SKIP buttons on the player, and
"6" button on the remote control unit
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.
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TEL 13942296513 QQ 376315150 892498299
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7
DVM-4800
3. SELF-DIAGNOSIS FUNCTION AND SERVICE MODES
3.1 Self-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:
The storage capacity is increased.
UHF error display
The latest error storage
function
n=1
Jitter/read error display
Laser drive current display
For 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 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.
Our DVD player currently
in use
Our new DVD
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TEL 13942296513 QQ 376315150 892498299
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8
DVM-4800
3.2 Service mode table
Pressing various button combinations on the player and remote control unit can activate the service modes.
Item Player mode and Function Display Cancellation
button combination method
Jitter check In PLAY mode, press Jitter check J_xxx_yyy_zz Press STOP
PAUSE and OPEN buttons Jitter rate is measured and displayed. Focus drive value or OPEN button.
on the player, and "5" Measurement is repeatedly done in Read error counter
button on the remote the cycle of one second. Read error Jitter rate
control unit. counter starts from zero upon mode Jitter check mode
setting, When target block data failed
to be read out, the counter advances Jitter rate is shown in decimal
by one increment. When the failure is notation to one place of decimal.
caused by minor error, it may be Focus drive value is shown in
corrected when retried to enable hexadecimal 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.
Error code In ** mode, press PAUSE Error code check Error code (play_err) is expressed Cancelled
check and OPEN buttons on the The latest error code stored in in the following convention. automatically
player, and "0" button on EEPROM is displayed.
Error code=0 x DAXX is expressed: ➔ nn UXX
5 seconds later.
the remote control unit.
Error code=0 x DBXX is expressed: ➔ nn HXX
* With pointing of cursor
Error code=0 x DXXX is expressed: ➔ nn FXX
up and down on diaplay,
Error code=0 x 0000 is expressed: ➔ nn F--
panel controller switches * "nn" denotes the serial number
the serial number of of history.
history and sends out the
command accordingly.
Initial setting In STOP mode, press Initial setting of laser drive current LDO_034_028 Cancelled
of laser drive PAUSE and OPEN buttons lnitial current value for each of DVD
CD laser current measurement
automatically
current on the player, and PAUSE laser and CD laser is separately
DVD laser current measurement
5 seconds later.
button on the remote saved in EEPROM.
Laser current measurement mode
control unit.
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.
DVD laser In STOP mode, press DVD laser drive current measurement LDD_034_032 Cancelled
drive current PAUSE and OPEN buttons DVD laser drive current is measured Measured current automatically
measurement on the player, and and the result is displayed together
Initial current stored in EEPROM
5 seconds later.
DISPLAY button on the with the initial value stored in
DVD laser current measurement mode
remote control unit. EEPROM.
After the measurement, DVD laser The value denotes the current in
emission is kept on. It is turned off decimal notation. The above
when POWER key is switched off. (It example shows the initial current
is also turned off when the primary is 34mA and the measured value
power is switched off.) is 32mA.
ADSC internal In ** mode, press PAUSE ADSC internal RAM data check A_DFA_6901 Press STOP
RAM data and OPEN buttons on the ADSC internal RAM data is read out
RAM data for specified address
or OPEN button.
check player, and RETURN and displayed. Address
button on the remote Change the address with CLEAR key
ADSC internal RAM data check mode
control unit. operation to show the data for 11
addresses. The value is shown in hexadecimal
notation. The above example
shows the data in ADSC address
DFAh is 6901h.
Servo process In STOP mode, press Servo process display Turn off the
display PAUSE and FWD-SKIP The servo process from STOP to primary power.
buttons on the player, and ACCESS is displayed.
"7" button on the remote
control unit.
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9
DVM-4800
Item Player mode and Function Display Cancellation
button combination method
CD laser drive In STOP mode, press CD laser drive current measurement LDC_028_026
current PAUSE and FWD-SKIP CD laser drive current is measured Measured current
measurement buttons on the player, and and the result is displayed together
Initial current stored in EEPROM
DISPLAY button on the with the initial value stored in
CD laser current measurement mode
remote control unit. EEPROM.
After the measurement, CD laser The value denotes the current in
emission is kept on. It is turned off decimal notation
when POWER key is switched off. (It The above example shows the
is also turned off when the primary initial current is 28mA and the
power is switched off.) measured value is 26mA.
Version In STOP mode, press Version display srrr_xyzzz Cancelled
display PAUSE and OPEN buttons
System controller release number
automatically
on the player, and "7"
System controller model number
5 seconds later.
button on the remote
System controller generation
control unit.
Panel controller release number
Panel controller model number
Lighting of In ** mode, press Lighting of display tube Press STOP
display tube PAUSE and OPEN buttons or OPEN button.
on the player, and "9"
button on the remote
control unit.
Dealer's lock In STOP mode, press Dealer's lock "LOCKED" sign appears when Repeat the
STOP button on the The lock is switched ON or OFF. dealer's lock is switched on, or same operation.
player, and POWER button When dealer's lock is ON, it prohibits when secondary power key or tray
on the remote control unit. switching off of the secondary power opening 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.
Initializaition In STOP mode, press Initialization "INITIALIZED"
PAUSE, BWD-SKIP and User settings are cancelled and player
OPEN buttons on the is initialized to factory setting.
player for 3 seconds or
longer.
Region display In STOP mode, press Region display x_yy_zzz Cancelled
PAUSE and OPEN buttons N: NTSC/6: PAL60 automatically
on the player, and "6" N: noPAL/P: PAL 5 seconds later.
button on the remote Region No.
control unit.
Item Player mode and Function Display Cancellation
button combination method
Timer 1 check In STOP mode, press Timer 1 check T1_1234_5678 Cancelled
PAUSE and FWD-SKIP Laser operation timer Operation time is
Shown to the left is DVD laser time,
automatically
buttons on the player, and measured separately for DVD laser and to the right CD laser time. 5 seconds later.
"5" button on the remote and CD laser.
Time is shown in 4 digits of decimal
control unit. notation in a unit of 10 hours.
"0000" will follow "9999".
Timer 1 reset While displaying Timer 1 Timer 1 reset T1_0000_0000 Cancelled
data, press STOP and Laser operation timer Operation time automatically
FWD-SKIP buttons on the of both DVD laser and CD laser is 5 seconds later.
player, and "5" button on reset all at once.
the remote control unit.
Timer 2 check In STOP mode, press Timer 2 check T2_1234 Cancelled
PAUSE and FWD-SKIP Spindle motor operation timer
automatically
buttons on the player, and
Time is shown in 4 digits of decimal
5 seconds later.
"6" button on the remote notation in a unit of 10 hours.
control unit. "0000" will follow "9999".
Timer 2 reset While displaying Timer 2 Timer 2 reset T2_0000 Cancelled
data, press STOP and Spindle motor operation timer automatically
FWD-SKIP buttons on the 5 seconds later.
player, and "6" button on
the remote control unit.
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10
DVM-4800
3.3 Servo Process Flow
Servo process
that has stopped
Starting flow
Initial setting
Tray control
Range of the
servo process
numbers
Processing items
Contents of each processNumber
00 00 Each initial setting
01 01 TRV initial movement
(Restrictions)
All processes that are under operation
cannot be displayed due to the limit of
the processing time.
Servo process
that is under
operation
1 2 0 9
START
TRV initial movement
02~08 02 Initial setting in FE system
05 Detecting LD ON HALF
08 Detecting CD LD ON
Disc detection
02~08 02 Initial setting in FE system
Disc type distinction
10~13 12 Focus ON
13 FBAL adjustment
Focus servo
14~15 15 Tracking ON
Tracking servo
17 17 Gain adjustment in ADSC
focus system
Gain learning
18~1A 19 DBAL/equalizer adjustment
1A ID read
ID read
Specification of the servo process
display in the starting flow
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11
DVM-4800
3.4 Servo 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:
Process classification Each processing item Description Process number
Initial start process Initial start The process starts after the tray is loaded. (The state 0~40
is changed to "READY" or "PREPARE".)
Secondary learning Servos for the DVD-DL 1st layer and the CD-DA double 50~7F
speed are learned in this step.
Restart process Restart When a user operates in the "READY" state, each servo 80~9F
is turned on.
Seek process Seek The optical pickup is moved to the disc destination in A0~BF
this process.
Repair process Recover
(Error check) An error is searched in the PLAY/SEEK state. C1~C3
(Attention) An error is recovered following the attention error C4~C6
interrupt from the S-ODC.
(Q code read) If any Q code is improperly read, reset and retry. C7~C9
Stop process Stop A servo is controlled in response to the user's operation F0~FF
to stop the disc completely.
Number allotment to the servo process
3.5 ADSC 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
4B4 Focus gain learning value for DVD-S, DVD-D(L0), CD, and VCD
4BC Focus gain learning value for DVD-D(L1)
4B6 Focus balance learning value for DVD-S, DVD-D(L0), CD, and VCD
4BE Focus balance learning value for DVD-D(L1)
4B5 Tracking gain value for DVD-S, DVD-D(L0), CD, and VCD
4BD Tracking gain value for DVD-D(L1)
TB0 Tracking balance value for DVD-S, DVD-D(L0), CD, and VCD
TB1 Tracking balance value for DVD-D(L1)
DBD DSL offset learning value for DVD-S and DVD-D
DBC DSL offset learning value for CD and VCD
FC0 Equalizer FC value for DVD-S, DVD-D(L0), CD, and VCD
BT0 Equalizer BOOST value for DVD-S, DVD-D(L0), CD, and VCD
FC1 Equalizer FC value for DVD-D(L1)
BT1 Equalizer BOOST value for DVD-D(L1)
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DVM-4800
3.6 Sales 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.)
3.7 Service 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.
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DVM-4800
4. DISASSEMBLY
(Follow the procedure below in reverse order when reassembling)
4.1 Top Cover
Remove 4 screws
1
on both sides and 3 screws
2
on the rear, then detach the Top Cover as shown to
the arrow direction.
4.2 Front Panel
(1) Remove 8 screws 3from the top and bottom edges
of the Front Panel.
(2) Detach the Front Panel to the arrow direction,
together with its Inner Panel.
1
1
Top Cover
2
4.3 Mother & Power P.W.B., Stay
(1) Remove 12 screws 4to detach the Mother P.W.B.
(2) Remove 4 screws
5
, to detach the Power P.W.B.
(3) Remove 4 screws 6to detach 2 Stays.
3
3
3
Connector
Flexible Wire
Flexible Wire
Front Panel
5
4
6
6
4
4
6
Power P.W.B.
Mother P.W.B.
Stay
6
5
Stay
3
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TEL 13942296513 QQ 376315150 892498299
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DVM-4800
4.4 Loader Frame Ass'y
Remove 2 screws 7to 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.
4.5 DVD Mecha.
(1) Remove 5 screws 8to detach the Rear Panel.
(2) Remove 4 screws
9
to detach the Clamp Base.
(3) Remove 4 fixed pin
to detach the DVD
Traverse Unit.
Side Plate Side Plate
7
7
Loader Frame
Rear Panel
8
8
8
9
9
Clamp Base
DVD Traverse Unit
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TEL 13942296513 QQ 376315150 892498299
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15
DVM-4800
5. ADJUSTMENT PROCEDURES
5.1. Service Tools and Equipment
Application Name Number
Tilt adjustment DVD test disc DVDT-S15 or DVDT-S01
Hex wrench
Inspection Extension 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
Others Screw lock RZZ0L01
Grease RFKXGAK152
Oil RFKXGA1280, JZS0648
Confirmation CD test disc PVCD-K06 or any other commercially
available disc
VCD test disc PVCD-K06 or any other commercially
available disc
Recovery disc RFKZD5TR001
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.
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TEL 13942296513 QQ 376315150 892498299
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DVM-4800
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 point Adjustment point Mode Disc
Tangential adjustment screw
Tilt adjustment screw
T01 (inner periphery) play
T43 (outer periphery) play
DVDR-S15 or DVDT-S01
Measuring equipment Adjustment value
None (Main unit display for servicing is used.) Adjust to the minimum jitter value.
Front Side
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DVM-4800
Do this confirmation after replacing a P.W.B.
5.5.1. Video Output (Luminance Signal)
Adjustment
Measurement
Point Adjustment
Point Mode Disc
Video Output
Pin Terminal
GND: Chassis
VR3225 Playback
(Color Bar) DVDT-S20
(title 9)
Measuring Device Adjustment 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 = 1000 20 mV p-p
Fig. 5-5-1 Luminance Signal Output
5.5.2. Video Output (Chrominance
Signal) Adjustment
Measurement
Point Adjustment
Point Mode Disc
Video Output
Pin Terminal
GND: Chassis
VR3221 Playback
(Color Bar) DVDT-S20
(title 9)
Measuring Device Adjustment 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 = 624 12 mV p-p
Fig. 5-5-2 Chrominance Signal Output
5.5. Electrical Adjustment
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TEL 13942296513 QQ 376315150 892498299
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DVM-4800
5.5.3. Video Output (CB Signal)
Adjustment
Measurement
Point Adjustment
Point Mode Disc
CB Output Pin
Terminal VR3201 Playback
(Color Bar) DVDT-S20
(title 9)
Measuring Device Adjustment Value
Oscilloscope
200 mV/div, 10 µs/div 486 ±10mV p-p
NOTE:
CB/CR Output should be 75Ωterminate.
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 = 486 10 mV p-p
Fig. 5-5-3 CB Signal Output
5.5.4. Progressive Video Output
(Y Signal) Adjustment
Measurement
Point Adjustment
Point Mode Disc
Progressive
Terminal
GND: Chassis
VR3771 Playback
(Color Bar) DVDT-S20
(title 9)
Measuring Device Adjustment Value
Oscilloscope
200 mV/div, 5 µs/div 1000 ±20mV p-p
NOTE:
Progressive Output should be 75Ωterminate.
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 = 1000 20 mV p-p
Fig. 5-5-4 Y Signal Output
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TEL 13942296513 QQ 376315150 892498299
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19
DVM-4800
5.5.5. Progressive Video Output
(PB Signal) Adjustment
Measurement
Point Adjustment
Point Mode Disc
Progressive
Terminal VR3751 Playback
(Color Bar) DVDT-S20
(title 9)
Measuring Device Adjustment Value
Oscilloscope
100 mV/div, 5 µs/div 525 ±10mV p-p
NOTE:
Progressive Output should be 75Ωterminate.
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.
Fig. 5-5-5 PB Signal Output
5.5.6. Test Point & Controls Location
MODULE P.W.B. (COMPONENT SIDE)
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TEL 13942296513 QQ 376315150 892498299
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