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DBTV2500
SERVICE MANUAL
COLOR TELEVISION RECEIVER
ORIGINAL
MFR'S VERSION B
Design and specifications are subject to change without notice.
DBTV2500
SERVICE MANUAL
COLOR TELEVISION RECEIVER
REVISION 1
MFR'S VERSION D
MFR'S VERSION IC101
B OEC7044A
D OEC7045A
Please file this revision with the original version.
Change of IC101
DIFFERENCES
MFR'S VERSION B MFR'S VERSION D
REF. NO. PART NO. DESCRIPTION PART NO. DESCRIPTION
IC101 I56F07044A IC OEC7044A I56F07045A IC OEC7045A
PCB010 A3I058G01A MAIN PCB ASS'Y TMX456A A3I058G01B MAIN PCB ASS'Y TMX456A
SPEC.NO. M3I0-62G
O/R NO. A073521
SERVICING NOTICES ON CHECKING
1. KEEP THE NOTICES 6. AVOID AN X-RAY
As for the places which need special attentions, Safety is secured against an X-ray by consider-
they are indicated with the labels or seals on the ing about the cathode-ray tube and the high
cabinet, chassis and parts. Make sure to keep the voltage peripheral circuit, etc.
indications and notices in the operation manual. Therefore, when repairing the high voltage pe-
2. AVOID AN ELECTRIC SHOCK ripheral circuit, use the designated parts and
There is a high voltage part inside. Avoid an make sure not modify the circuit.
electric shock while the electric current is Repairing except indicates causes rising of high
flowing. voltage, and it emits an X-ray from the cathode-
ray tube.
3. USE THE DESIGNATED PARTS
The parts in this equipment have the specific 7. PERFORM A SAFETY CHECK AFTER
characters of incombustibility and withstand SERVICING
voltage for safety. Therefore, the part which is
replaced should be used the part which has Confirm that the screws, parts and wiring which
the same character. were removed in order to service are put in the
Especially as to the important parts for safety original positions, or whether there are the
which is indicated in the circuit diagram or the portions which are deteriorated around the
table of parts as a mark, the designated serviced places serviced or not. Check the
parts must be used. insulation between the antenna terminal or
external metal and the AC cord plug blades.
And be sure the safety of that.
4. PUT PARTS AND WIRES IN THE
ORIGINAL POSITION AFTER (INSULATION CHECK PROCEDURE)
ASSEMBLING OR WIRING 1. Unplug the plug from the AC outlet.
There are parts which use the insulation 2. Remove the antenna terminal on TV and turn
material such as a tube or tape for safety, or on the TV.
which are assembled in the condition that 3. Insulation resistance between the cord plug
these do not contact with the printed board. terminals and the eternal exposure metal
The inside wiring is designed not to get closer [Note 2] should be more than 1M ohm by
to the pyrogenic parts and high voltage parts. using the 500V insulation resistance meter
Therefore, put these parts in the original [Note1] .
positions. 4. If the insulation resistance is less than 1M
ohm, the inspection repair should be
5. TAKE CARE TO DEAL WITH THE required.
CATHODE-RAY TUBE [Note 1]
In the condition that an explosion-proof cathode- If you have not the 500V insulation
ray tube is set in this equipment, safety is resistance meter, use a Tester.
secured against implosion. However, when
[Note 2]
removing it or serving from backward, it is
External exposure metal: Antenna terminal
dangerous to give a shock. Take enough care to
deal with it.
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
CONTENTS
SERVICING NOTICES ON CHECKING ...................................................................................................... A1-1
HOW TO ORDER PARTS ........................................................................................................................... A1-1
IMPORTANT ................................................................................................................................................ A1-1
CONTENTS ................................................................................................................................................. A2-1
GENERAL SPECIFICATIONS .................................................................................................................... A3-1~A3-4
DISASSEMBLY INSTRUCTIONS ............................................................................................................... B-1, B-2
SERVICE MODE LIST ................................................................................................................................. C-1
CONFIRMATION OF USING HOURS ......................................................................................................... C-1
NOTE FOR THE REPLACING OF MEMORY IC ........................................................................................ C-1
ELECTRICAL ADJUSTMENTS .................................................................................................................. D1-1~D2-1
MAJOR COMPONENTS LOCATION GUIDE ............................................................................................. D3-1
BLOCK DIAGRAM ...................................................................................................................................... E-1, E-2
PRINTED CIRCUIT BOARDS
MAIN/CRT........................................................................................................................................... F-1~F-4
SCHEMATIC DIAGRAMS
MICON/TUNER .................................................................................................................................. G-1, G-2
CHROMA ........................................................................................................................................... G-3, G-4
DEFLECTION/CRT ............................................................................................................................ G-5, G-6
POWER ............................................................................................................................................. G-7, G-8
SOUND .............................................................................................................................................. G-9, G-10
WAVEFORMS ............................................................................................................................................. H-1, H-2
MECHANICAL EXPLODED VIEW .............................................................................................................. I-1
MECHANICAL REPLACEMENT PARTS LIST .......................................................................................... J1-1
ELECTRICAL REPLACEMENT PARTS LIST ............................................................................................ J2-1, J2-2
A2-1
GENERAL SPECIFICATIONS
G-1.Outline of the Product
25 inch( 626 mmV):Measured diagonally
Color CRT 100 degree deflection
G-2.Broadcasting System
US System M
G-3.Color System NTSC PAL SECAM or Monochrome signal
G-4.NTSC Playback(PAL 60Hz) Yes No
G-5.NTSC 3.58+4.43/PAL60Hz Yes No
G-6.Antenna Input Impedance
VHF/UHF 75 ohm unbalanced
G-7.Tuner and Receiving Contactless Electric tuner 1Tuner System
2Tuner System
channel Tuner Oscar(W/O HYPER) Oscar(W/ HYPER)
France CATV) Others
Receiving channel
(USA) 2-69 , 4A , A-5~A-1 , A~I , J~W , W+1~W+84
Tuning System
Frequency syn. Voltage syn. Others
G-8.Preset Channel
-- channels
G-9.Intermediate Frequency
Picture(fP) 45.75 MHz MHz MHz
Sound (fS) 41.25 MHz MHz MHz
fP-fS 4.50 MHz MHz MHz
G-10.Stereo/Dual TV Sound
Yes( NICAM GERMAN USA JAPAN) No
G-11.Tuner Sound Muting Yes No
G-12.Power Source 120 V AC 50Hz AC 60Hz
G-13.Power Consumption: 115 W at AC 120 V 60 Hz
W at DC V
Stand by: 8 W at AC 120 V 60 Hz
Per Year: - kWh / Year
G-14.Dimensions(Approx.)
618 mm(W) 504 mm(D) 525 mm(H)
G-15.Weight(Approx.) Net : 27 kg ( 59.9 lbs)
Gross: 29 kg ( 64.3 lbs)
G-16.Cabinet Material
Cabinet Front: PS 94HB DECABROM
ABS 94V2 NON-DECA
94V0
Back Panel: PS 94HB DECABROM
ABS 94V2 NON-DECA
94V0
A3- 1
GENERAL SPECIFICATIONS
G-17.Protector: Power Fuse
G-18.Regulation
Safety
UL CSA SAA SI CE SEV
BS NF NEMKO FEMKO DEMKO IEC65
SEMKO NZ HOMOLO SABS CNS SISIR
NOM AS3159 DENTORI UNE GOST NONE
Radiation
FCC DOC FTZ PTT CE SEV
SABA SI NF NZ HOMOLO UNE
CNS CISPR13 DENTORI AS/NZS NONE
X-Radiation
PTB DHHS HWC DENTORI NONE
G-19.Temperature
Operation 5