Design and specifications are subject to change without notice.
Page 2
DBTV2500
SER VICE MANUAL
COLOR TELEVISION RECEIVER
REVISION 1
MFR’S VERSION D
MFR’S VERSION
B
D
Please file this revision with the original version.
IC101
OEC7044A
OEC7045A
Page 3
Change of IC101
DIFFERENCES
MFR'S VERSION BMFR'S VERSION D
REF. NO.
IC101I56F07044A IC OEC7044AI56F07045AIC OEC7045A
PCB010A3I058G01A MAIN PCB ASS'Y TMX456AA3I058G01B MAIN PCB ASS'Y TMX456A
PART NO.DESCRIPTIONPART NO.DESCRIPTION
SPEC.NO.M3I0-62G
O/R NO.A073521
Page 4
SERVICING NOTICES ON CHECKING
As for the places which need special attentions,
they are indicated with the labels or seals on the
cabinet, chassis and parts. Make sure to keep the
indications and notices in the operation manual.
2. AVOID AN ELECTRIC SHOCK
There is a high voltage part inside. Avoid an
electric shock while the electric current is
flowing.
3. USE THE DESIGNATED PARTS
The parts in this equipment have the specific
characters of incombustibility and withstand
voltage for safety. Therefore, the part which is
replaced should be used the part which has
the same character.
Especially as to the important parts for safety
which is indicated in the circuit diagram or the
table of parts as a mark, the designated
parts must be used.
PUT PARTS AND WIRES IN THE
4.
ORIGINAL POSITION AFTER
ASSEMBLING OR WIRING
There are parts which use the insulation
material such as a tube or tape for safety, or
which are assembled in the condition that
these do not contact with the printed board.
The inside wiring is designed not to get closer
to the pyrogenic parts and high voltage parts.
Therefore, put these parts in the original
positions.
5. TAKE CARE TO DEAL WITH THE
CATHODE-RAY TUBE
In the condition that an explosion-proof cathoderay tube is set in this equipment, safety is
secured against implosion. However, when
removing it or serving from backward, it is
dangerous to give a shock. Take enough care to
deal with it.
6. AVOID AN X-RAY1. KEEP THE NOTICES
Safety is secured against an X-ray by considering about the cathode-ray tube and the high
voltage peripheral circuit, etc.
Therefore, when repairing the high voltage peripheral circuit, use the designated parts and
make sure not modify the circuit.
Repairing except indicates causes rising of high
voltage, and it emits an X-ray from the cathoderay tube.
7.PERFORM A SAFETY CHECK AFTER
SERVICING
Confirm that the screws, parts and wiring which
were removed in order to service are put in the
original positions, or whether there are the
portions which are deteriorated around the
serviced places serviced or not. Check the
insulation between the antenna terminal or
external metal and the AC cord plug blades.
And be sure the safety of that.
(INSULATION CHECK PROCEDURE)
1.
Unplug the plug from the AC outlet.
2.
Remove the antenna terminal on TV and turn
on the TV.
3.
Insulation resistance between the cord plug
terminals and the eternal exposure metal
[Note 2] should be more than 1M ohm by
using the 500V insulation resistance meter
[Note 1] .
4.
If the insulation resistance is less than 1M
ohm, the inspection repair should be
required.
[Note 1]
If you have not the 500V insulation
resistance meter, use a Tester.
[Note 2]
External exposure metal: Antenna terminal
HOW TO ORDER PARTS
Please include the following informations when you order parts. (Particularly the VERSION LETTER.)
1. MODEL NUMBER and VERSION LETTER
The MODEL NUMBER can be found on the back of each product and the VERSION LETTER can be
found at the end of the SERIAL NUMBER.
2. PART NO. and DESCRIPTION
You can find it in your SERVICE MANUAL.
IMPORTANT
Inferior silicon grease can damage IC's and transistors.
When replacing an IC's or transistors, use only specified silicon grease (YG6260M).
Remove all old silicon before applying new silicon.
A1-1
Page 5
CONTENTS
SERVICING NOTICES ON CHECKING......................................................................................................
HOW TO ORDER PARTS ...........................................................................................................................
25 inch( 626 mmV):Meas ured di a gona ll y
Color CRT 100 degree deflection
G-2.B roadc asting S yst e m
US System M
G-3.Col o r S ys t e mNTSCPALSECAM or Monoc hrome si gna l
G-4.NTSC P laybac k(PAL 60Hz)YesNo
G-5.NTSC 3.58+4.43/PAL60HzYesNo
G-6.Ante nna Input Impe da nc e
VHF/UHF 75 ohm unbalanced
G-7.Tuner and ReceivingContactless Electric tuner1Tuner Sys te m
Storage -20 ˚C~ 60 ˚C
G-20.Operating HumidityLess than 80 %RH
G-21.C loc k and Time r
Sleep TimerYes Max 120 Min.( 10 Min. Step)No
On/Off Time rYes ProgramsNo
Wake Up TimerYes ProgramsNo
G-22.Timer bac k up Tim e
More than -- Minutes (at Power Off Mode)
G-23.Terminals
G-24.Indicator
( )( )( )
G-25.Display
On S c ree n Dis p lay
VHF/UHF Antenna Input Din Type F-Type France Type
Front Video Input(RCA ø8.3)
Rear Video Input(RCA ø8.3)
Rear Video Output(RCA ø8.3)
Front Audio Input(RCA ø8.3)
Rear Audio Input(RCA ø8.3)
Rear Audio Output(RCA ø8.3)
21 PinDC Jack(Center +)Ea r Phone Ja ck( ø3.5)
Hea d P hone Ja c k(ø3.5)AC Ou t l e tExt Speaker
DiversityS Input( F ront)S Input( R e a r)
PowerSta nd B yOn Time rNONE
MenuC lock Se t (12H 24H)System SelecOn/Off Timer
Hotel LockArea CodeCH Tuning
Sound 1/2NIC AM Au t o OffPicture
Guid e CH S e tAudioLanguage
CATVPin C ode R e gis tra tionV-Chip
Control Le ve lSoundBrightnessContrast
ColorTint ( NTS C Onl y)Sharpness
TuningBassTreble
BalanceBack Light
Stereo, Audio Output, B il ingua lPicture Menu
Stereo, Audio Output, S APMid Night Theate r
Stereo, Audio OutputGAME
AVChannelClockHotel Lock
Sleep TimerSound MutePin C ode
A3- 2
Page 8
G-26.OS D Langua ge
EngGerFreSpaItaPorJpn
OSD Langua ge S e tting
EngGerFreSpaItaPorJpn
Not Applica ble
G-27.Speaker
PositionFrontSideBottom
Size 1.5 x 2.7 inc he s
Imp. 4 ohm x 2 pcs
Powe rMa x 075 + 0.75 W
G-28.EXT Speaker
Yes -- WImp -- ohm
G-29.Carton
Maste r Ca rton:NeedNo Ne ed
Content: ---- Set
Material: ---- / ---- Corrugated Carton
Dimensions: ---- mm(W) ---- mm(D) ---- mm(H)
Desc ripti on of OriginYesNo
Gift B ox
Material Double /B rown Corrugate d Carton (wit h P hoto La be l)
Dimensions: 689 mm(W) 577 mm(D) 620 mm(H)
Design:As Per BUYER 's
Desc ripti on of Origin:YesNo
Drop TestNat ural Dropping At 1 Corner / 3 Edge s / 6 S urfaces
Container Stuffing: 204 Sets / 40' container
G-30.Accessories
Owner's Ma nua l (W/Guarantee Card) [ English/French ]
AC Plu g Ad a p terChannel Film
Battery (UM- 4 x 2 )Remote C ontrol Unit
Safety TipToll Free Insert Sheet
Guarantee CardAudio-Vide o Cord ( R CA)
Re gis tra tion C a rdWarning Sheet
Quick Set-Up She etSche matic Diagram
Informa t i o n S h ee tU/V M i xer
75 ohm Coa xi a l C a bl e (Single ShieldDouble S hie l d)
300 ohm to 75 ohm VHF Ante nna Ada ptor
21pin Ca bl eCar Cord
Rod Ante nna
Loop Antenna(F-TypeDin TypeFrance Type)
G-31.Othe r F e a ture s
Auto Dega ussAuto SearchFull OSD
Auto S h ut OffCH AllocationPremiere
Canal+SAPComb Filter
CATV(181CH)Cha nne l LockAuto CH Memory
Anti-TheftJust C loc k F unc t ionHotel Lock
RentalGame PositionFastext
UnitextTopTextClosed Caption
Picture MenuM id Night The a t e rV-Chip
GENERAL SPECIFICATIONS
10% 0.5 + 0.5 W (Typic a l)
Double/ W hit e C orrugate d C a rton (with Phot o La be l)
Double F ul l C olor Ca rton W / Phot o
Height25cm31cm46cm62cm80cm
One P o l eTwo Pole (F-TypeDin TypeFrance Type)
A3- 3
Page 9
GENERAL SPECIFICATIONS
G-32.Switch
Front
Power( Tact)Channel Up/ResetVolume Up/Set Up
System SelectCha nne l Down/Ente rVolu m e Do wn/ S et Down
Main Power SWSub P owe rMe n u:Vol UP + Vol Down
Glow in Dark RemoconYesNo
Power Source:D.C 3 V Battery UM - 4 x 2
Total 26 Key
PowerQuick Vi ewTV/A V
Stand ByStatusBar Select
0Time Sele c tPAL/SECAM
1Time SetVolume Up
2MutingVolu m e Do wn
3CH SkipCH Call
4CH1/CH2C H Do wn
5ChannelCH Up
6Text/Mix/TVCH Do wn/ P age Down
7Displa y C a nc e lCH Up/Page Up
8InitialPa ge + / 9StoreProgram
10RevealF/T/B
11SleepHold
12Aft/SkipList
1PresetRotate
25.5/6.5MHzBrowse
0/10Auto MemoryStd/Auto
Tone 1/ 2AutoMemory
InfoCallBa nd S e lect
Mono/AutoResetSearch
TV/Caption/TextMenuClock/Program
ExpandEnterClock/Set
RedAddCh Set
CyanDele teSet +
NormalYellowSe t Color SystemRandomGreen
Wide SelecyTuning Up/Tim e Te xtNica m/Mono
Auto W i d e On / OffTuning Down/Re se tTone A/B
Picture PositionNaviF M Transmitter
Direct Change/Auto SearchBack Light
Picture MenuMid Night The a te rAudio Se le ct
A3- 4
Page 10
DISASSEMBLY INSTRUCTIONS
1. REMOVAL OF ANODE CAP
Read the following NOTED items before starting work.
*
After turning the power off there might still be a potential
voltage that is very dangerous. When removing the
Anode Cap, make sure to discharge the Anode Cap's
potential voltage.
*
Do not use pliers to loosen or tighten the Anode Cap
terminal, this may cause the spring to be damaged.
REMOVAL
1. Follow the steps as follows to discharge the Anode Cap.
(Refer to Fig. 1-1.)
Connect one end of an Alligator Clip to the metal part of a
flat-blade screwdriver and the other end to ground.
While holding the plastic part of the insulated Screwdriver,
touch the support of the Anode with the tip of the
Screwdriver.
A cracking noise will be heard as the voltage is discharged.
GND on the CRT
3. After one side is removed, pull in the opposite direction to
remove the other.
NOTE
Take care not to damage the Rubber Cap.
INSTALLATION
1. Clean the spot where the cap was located with a small
amount of alcohol. (Refer to Fig. 1-3.)
Location of Anode Cap
Screwdriver
Alligator Clip
GND on the CRT
Flip up the sides of the Rubber Cap in the direction of the
2.
arrow and remove one side of the support.
(Refer to Fig. 1-2.)
Rubber Cap
Support
CRT
Fig. 1-1
Fig. 1-3
NOTE
Confirm that there is no dirt, dust, etc. at the spot where
the cap was located.
2.3.Arrange the wire of the Anode Cap and make sure the
wire is not twisted.
Turn over the Rubber Cap. (Refer to Fig. 1-4.)
Fig. 1-4
CRT
Support
Fig. 1-2
B-1
Page 11
DISASSEMBLY INSTRUCTIONS
4. Insert one end of the Anode Support into the anode button,
then the other as shown in Fig. 1-5.
Support
CRT
5.6.Confirm that the Support is securely connected.
Put on the Rubber Cap without moving any parts.
2. REMOVAL OF DEFLECTION YOKE
(Refer to Fig. 2-1)
1.
Loosen the screw 1.
2.
Remove the Convergence • Purity Magnet in the
direction of arrow (A).
3.
Loosen the screw 2.
4.
Remove the 3 Wedges.
5.
Remove the Deflection Yoke in the direction of arrow
(B).
Fig. 1-5
2
Wedge
Wedge
INSTALLATION
Install new Deflection Yoke in reverse steps of REMOVAL.
NOTE
After adjusting the purity and the convergence, fix the
screw 2 and lock the wedges.
(B)
Deflection Yoke
1
(A)
Convergence •
Purity Magnet
Fig. 2-1
B-2
Page 12
SERVICE MODE LIST
This unit provided with the following SERVICE MODES so you can repair, examine and adjust easily.
To enter the Service Mode, press both set key and remote control key for more than 1 second.
Set KeyRemocon KeyOperations
VOL. (-) MIN
0
Releasing of V-CHIP PASSWORD.
VOL. (-) MIN1
VOL. (-) MIN6
VOL. (-) MIN8
VOL. (-) MIN
9
Initialization of the factory.
NOTE: Do not use this for the normal servicing.
POWER ON total hours is displayed on the screen.
Refer to the "CONFIRMATION OF USING HOURS".
Can be checked of the INITIAL DATA of MEMORY IC.
Refer to the "NOTE FOR THE REPLACING OF MEMORY IC".
Writing of EEPROM initial data.
NOTE: Do not use this for the normal servicing.
Display of the Adjustment MENU on the screen.
Refer to the "ELECTRICAL ADJUSTMENT" (On-Screen Display Adjustment).
CONFIRMATION OF USING HOURS
POWER ON total hours can be checked on the screen. Total hours are displayed in 16 system of notation.
1.
Set the VOLUME to minimum.
2.
Press both VOL. DOWN button on the set and Channel
button (6) on the remote control for more than 1 second.
3.
After the confirmation of using hours, turn off the power.
ADDRESSDATA
INIT 00 83
CRT ON
0010
FIG. 1
Initial setting content of MEMORY IC.
POWER ON total hours.
= (16 x 16 x 16 x thousands digit value)
+ (16 x 16 x hundreds digit value)
+ (16 x tens digit value)
+ (ones digit value)
NOTE FOR THE REPLACING OF MEMORY IC
If a service repair is undertaken where it has been required to change the MEMORY IC, the following steps should be taken to
ensure correct data settings while making reference to TABLE 1.
ADDRESS
DATA
1.
Enter DATA SET mode by setting VOLUME to minimum.
2.
Press both VOL. DOWN button on the set and Channel button (6) on the remote control for more than 1 second.
ADDRESS and DATA should appear as FIG 1.
3.
ADDRESS is now selected and should "blink". Using the SET + or - keys on the remote, step through the ADDRESS until
required ADDRESS to be changed is reached.
4.
Press ENTER to select DATA. When DATA is selected, it will "blink".
5.
Again, step through the DATA using SET + or - until required DATA value has been selected.
6.
Pressing ENTER will take you back to ADDRESS for further selection if necessary.
7.
Repeat steps 3 to 6 until all data has been checked.
8.
When satisfied correct DATA has been entered, turn POWER off (return to STANDBY MODE) to finish DATA input.
The unit will now have the correct DATA for the new MEMORY IC.
INI00INI01INI02INI03INI04INI05INI06INI07INI08INI
A001A20902632418A121
Table 1
09
INI
0A
44
C-1
Page 13
ELECTRICAL ADJUSTMENTS
1. BEFORE MAKING ELECTRICAL
ADJUSTMENTS
Read and perform these adjustments when repairing the
circuits or replacing electrical parts or PCB assemblies.
CAUTION
•
Use an isolation transformer when performing any
service on this chassis.
•
Before removing the anode cap, discharge electricity
because it contains high voltage.
•
When removing a PCB or related component, after
unfastening or changing a wire, be sure to put the wire
back in its original position.
Inferior silicon grease can damage IC's and transistors.
•
When replacing IC's and transistors, use only specified
silicon grease (YG6260M).
Remove all old silicon before applying new silicon.
Prepare the following measurement tools for electrical
adjustments.
1. Synchro Scope
2. Digital Voltmeter
On-Screen Display Adjustment
In the condition of NO indication on the screen.
1.
Press the VOL. DOWN button on the set and the
Channel button (9) on the remote control for more than
1 second to appear the adjustment mode on the screen
as shown in Fig. 1-1.
TV
00 OSD 15
Fig. 1-1
2.
Use the Channel UP/DOWN button or Channel button
(0-9) on the remote control to select the options shown
in Fig. 1-2.
3.
Press the MENU button on the remote control to end
the adjustments.
FUNCTION
NO.
00
01
02
03
04
05
06
07
08
09
10
11
12
OSD H
CUT OFF
RF DELAY
VIF VCO
H VCO
H PHASE
V SIZE
V SHIFT
R DRIVE
B DRIVE
R BIAS
G BIAS
B BIAS
FUNCTION
NO.
BRIGHTNESS
13
CONTRAST
14
COLOR
15
TINT
16
SHARPNESS
17
FM LEVEL
18
LEVEL
19
SEPARATION 1
20
SEPARATION 2
21
TEST MONO
22
TEST STEREO
23
X-RAY TEST
24
Fig. 1-2
2. BASIC ADJUSTMENTS
2-1: RF AGC DELAY
1.
Receive an 80dB monoscope pattern.
2.
Connect the digital voltmeter to TP001.
3.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (02) on the remote control to
select "RF DELAY".
4.
Press the VOL. UP/DOWN button on the remote control
until the digital voltmeter is 1.80 ± 0.05V.
2-2: CUT OFF
Adjust the unit to the following settings.
1.
R.DRIVE=10, B.DRIVE=10, R.BIAS=64, G.BIAS=64,
B.BIAS=64, BRIGHTNESS=126, CONTRAST=100.
Place the set with Aging Test for more than 15 minutes.
2.
Activate the adjustment mode display of Fig. 1-1 and
3.
press the channel button (01) on the remote control to
select "CUT OFF".
Adjust the Screen Volume until a dim raster is obtained.
4.
2-3: WHITE BALANCE
NOTE: Adjust after performing CUT OFF adjustment.
1.
Place the set with Aging Test for more than 10 minutes.
2.
Receive the with 100% signal from the pattern generator.
3.
Using the remote control, set the brightness and contrast to
normal position.
4.
Activate the adjustment mode display of Fig. 1-1 and press
the channel button (10) on the remote control to select
"R.BIAS".
5.
Using the VOL. UP/DOWN button on the remote control,
adjust the R.BIAS.
6.
Press the CH. UP/DOWN button on the remote control to
select the "R.DRIVE", "B.DRIVE", "G.BIAS" or "B.BIAS".
7.
Using the VOL. UP/DOWN button on the remote control,
adjust the R.DRIVE, B.DRIVE, G.BIAS or B.BIAS.
8.
Perform the above adjustments 6 and 7 until the white
color is looked like a white.
2-4: FOCUS
1.
Receive the monoscope pattern.
2.
Turn the Focus Volume fully counterclockwise once.
3.
Adjust the Focus Volume until picture is distinct.
2-5: SUB TINT/SUB COLOR
1.
Receive the color bar pattern.
2.
Connect the synchro scope to TP023.
3.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (16) on the remote control to
select "TINT".
4.
Press the VOL. UP/DOWN button on the remote control
until the waveform becomes as shown in Fig. 2-1.
5.
Connect the synchro scope to TP022.
6.
Press the CH DOWN button once to set to "COLOR"
mode.
7.
Press the VOL. UP/DOWN button on the remote control
until the red color level is adjusted to 110% of the white
level. (Refer to Fig. 2-2)
D1-1
Page 14
ELECTRICAL ADJUSTMENTS
Fig. 2-1
TV
00 OSD 15
0%
110%
100%
Fig. 2-2
2-6: HORIZONTAL PHASE
Receive the center cross signal from the Pattern
1.
Generator.
Using the remote control, set the brightness and
2.
contrast to normal position.
Activate the adjustment mode display of Fig. 1-1 and
3.
press the channel button (05) on the remote control to
select "H.PHASE".
Press the VOL. UP/DOWN button on the remote
4.
control until the SHIFT quantity of the OVER SCAN on
right and left becomes minimum.
2-7: VERTICAL SIZE
NOTE: Adjust after performing adjustments in section 2-6
Receive the crosshatch signal from the Pattern
1.
Generator.
Using the remote control, set the brightness and
2.
contrast to normal position.
Activate the adjustment mode display of Fig. 1-1 and
3.
press the channel button (06) on the remote control to
select "V.SIZE".
Press the VOL. UP/DOWN button on the remote control
4.
until the rectangle on the center of the screen becomes
square.
Receive a broadcast and check if the picture is normal.
5.
BA
2-9: OSD HORIZONTAL
1.2.Activate the adjustment mode display of Fig. 1-1.
Press the VOL. UP/DOWN button on the remote
control until the difference of A and B becomes
minimum. (Refer to Fig. 2-3)
2-10: VERTICAL VCO
1.
Place the set with Aging Test for more than 15 minutes.
2.
Receive an 80dB monoscope pattern.
3.
Connect the digital voltmeter between the pin 5 ofCP601.
4.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (03) on the remote control to
select "VIF VCO".
5.
Press the VOL. UP/DOWN button on the remote control
until the digital voltmeter is 2.5V.
2-11: SUB BRIGHTNESS
1.
Receive the black pattern*. (RF Input)
2.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (13) on the remote control to
select "BRIGHTNESS".
3.
Press the VOL. UP/DOWN button on the remote control
unit the screen begin to shine.
2-12: SUB CONTRAST
1.
Receive the color bar pattern.
2.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (14) on the remote control to
select "CONTRAST".
3.
Press the VOL. UP/DOWN button on the remote control
unit the nit for more than 200 nit.
Fig. 2-3
2-8: VERTICAL SHIFT
NOTE: Adjust after performing adjustments in section 2-7
1.
Receive the crosshatch signal from the Pattern
Generator.
2.
Using the remote control, set the brightness and
contrast to normal position.
3.
Activate the adjustment mode display of Fig. 1-1
and press the channel button (07) on the remote control to
select "V.SHIFT".
4.
Press the VOL. UP/DOWN button on the remote
control until the horizontal line becomes fit to the notch
of the shadow mask.
D1-2
Page 15
ELECTRICAL ADJUSTMENTS
3.
PURITY AND CONVERGENCE
ADJUSTMENTS
NOTE
Turn the unit on and let it warm up for at least 30
1.
minutes before performing the following adjustments.
Place the CRT surface facing east or west to reduce the
2.
terrestrial magnetism.
Turn ON the unit and demagnetize with a Degauss Coil.
3.
3-1: STATIC CONVERGENCE (ROUGH ADJUSTMENT)
Tighten the screw for the magnet. Refer to the adjusted
1.
CRT for the position. (Refer to Fig. 3-1)
If the deflection yoke and magnet are in one body,
untighten the screw for the body.
Receive the green raster pattern from the color bar
2.
generator.
Slide the deflection yoke until it touches the funnel
3.
side of the CRT.
Adjust center of screen to green, with red and blue on the
4.
sides, using the pair of purity magnets.
Switch the color bar generator from the green raster
5.
pattern to the crosshatch pattern.
Combine red and blue of the 3 color crosshatch pattern
6.
on the center of the screen by adjusting the pair of
4 pole magnets.
Combine red/blue (magenta) and green by adjusting the
7.
pair of 6 pole magnets.
Adjust the crosshatch pattern to change to white
8.
by repeating steps 6 and 7.
3-2: PURITY
NOTE
Adjust after performing adjustments in section 3-1.
1.
Receive the green raster pattern from color bar
generator.
2.
Adjust the pair of purity magnets to center the
color on the screen.
Adjust the pair of purity magnets so the color at the
ends are equally wide.
3.
Move the deflection yoke backward (to neck side)
slowly, and stop it at the position when the whole
screen is green.
4.
Confirm red and blue colors.
5.
Adjust the slant of the deflection yoke while watching the
screen, then tighten the fixing screw.