Durabrand DBTV2500 User Manual

DBTV2500

SERVICE MANUAL

COLOR TELEVISION RECEIVER

ORIGINAL

MFR’S VERSION B

Design and specifications are subject to change without notice.

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

Change of IC101

DIFFERENCES

MFR'S VERSION B MFR'S VERSION D

REF. NO.

IC101 I56F07044A IC OEC7044A I56F07045A IC OEC7045A

PCB010 A3I058G01A MAIN PCB ASS'Y TMX456A A3I058G01B MAIN PCB ASS'Y TMX456A

PART NO. DESCRIPTION PART NO. DESCRIPTION

SPEC.NO. M3I0-62G

O/R NO. A073521

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

CONTENTS

SERVICING NOTICES ON CHECKING......................................................................................................

HOW TO ORDER PARTS ...........................................................................................................................

IMPORTANT................................................................................................................................................

CONTENTS .................................................................................................................................................

GENERAL SPECIFICATIONS ....................................................................................................................

DISASSEMBLY INSTRUCTIONS ...............................................................................................................

SERVICE MODE LIST.................................................................................................................................

CONFIRMATION OF USING HOURS.........................................................................................................

NOTE FOR THE REPLACING OF MEMORY IC ........................................................................................

ELECTRICAL ADJUSTMENTS ..................................................................................................................

MAJOR COMPONENTS LOCATION GUIDE .............................................................................................

BLOCK DIAGRAM ......................................................................................................................................

PRINTED CIRCUIT BOARDS

MAIN/CRT...........................................................................................................................................

SCHEMATIC DIAGRAMS

MICON/TUNER..................................................................................................................................

CHROMA ...........................................................................................................................................

DEFLECTION/CRT ............................................................................................................................

POWER .............................................................................................................................................

SOUND ..............................................................................................................................................

WAVEFORMS .............................................................................................................................................

MECHANICAL EXPLODED VIEW ..............................................................................................................

MECHANICAL REPLACEMENT PARTS LIST ..........................................................................................

ELECTRICAL REPLACEMENT PARTS LIST ............................................................................................

A1-1
A1-1
A1-1
A2-1
A3-1~A3-4
B-1, B-2
C-1
C-1
C-1
D1-1~D2-1
D3-1
E-1, E-2

F-1~F-4
G-1, G-2

G-3, G-4
G-5, G-6
G-7, G-8
G-9, G-10
H-1, H-2
I-1
J1-1
J2-1, J2-2

A2-1

GENERAL SPECIFICATIONS

G-1.Outline of the Product

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 m NTSC PAL SECAM or Monoc hrome si gna l
G-4.NTSC P laybac k(PAL 60Hz) Yes No
G-5.NTSC 3.58+4.43/PAL60Hz Yes No
G-6.Ante nna Input Impe da nc e

VHF/UHF 75 ohm unbalanced
G-7.Tuner and Receiving Contactless Electric tuner 1Tuner Sys te m

2Tuner Sys te m

cha nnel Tune r Osc ar( W/O HYPER ) Osc ar( W/ HYPER )

France CATV) Others

Receiving channel

(USA) 2-69 , 4A , A-5~A-1 , A~I , J~W , W+1~W+84

Tuning Syst e m

Fre que nc y syn. Volta ge syn. Others

G-8.Prese t C ha nne l

-- channels

G-9.Inte rme diate F reque nc y

Picture(fP) 45.75 MHz MHz MHz

Sound (fS) 41.25 MHz MHz MHz

fP-fS 4.50 MHz MHz MHz
G-10.S t e reo/ Dual TV Sound

Ye s( NICAM GERMAN USA JAPAN) No
G-11.Tune r Sound Mut ing 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.C a binet Ma terial

Ca binet F ront: 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-R a dia tion

PTB DHHS HWC DENTORI NONE

G-19.Temperature

Operation 5 ˚C~ 40 ˚C

Storage -20 ˚C~ 60 ˚C
G-20.Operating Humidity Less than 80 %RH
G-21.C loc k and Time r

Sleep Timer Yes Max 120 Min.( 10 Min. Step) No

On/Off Time r Yes Programs No

Wake Up Timer Yes Programs No
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 Pin DC Jack(Center +) Ea r Phone Ja ck( ø3.5)
Hea d P hone Ja c k(ø3.5) AC Ou t l e t Ext Speaker
Diversity S Input( F ront) S Input( R e a r)

Power Sta nd B y On Time r NONE

Menu C lock Se t ( 12H 24H) System Selec On/Off Timer

Hotel Lock Area Code CH Tuning
Sound 1/2 NIC AM Au t o Off Picture
Guid e CH S e t Audio Language
CATV Pin C ode R e gis tra tion V-Chip

Control Le ve l Sound Brightness Contrast

Color Tint ( NTS C Onl y) Sharpness
Tuning Bass Treble

Balance Back Light
Stereo, Audio Output, B il ingua l Picture Menu
Stereo, Audio Output, S AP Mid Night Theate r
Stereo, Audio Output GAME
AV Channel Clock Hotel Lock
Sleep Timer Sound Mute Pin C ode

A3- 2

G-26.OS D Langua ge

Eng Ger Fre Spa Ita Por Jpn

OSD Langua ge S e tting

Eng Ger Fre Spa Ita Por Jpn
Not Applica ble

G-27.Speaker

Position Front Side Bottom
Size 1.5 x 2.7 inc he s
Imp. 4 ohm x 2 pcs
Powe r Ma x 075 + 0.75 W

G-28.EXT Speaker

Yes -- W Imp -- ohm

G-29.Carton

Maste r Ca rton: Need No Ne ed

Content: ---- Set
Material: ---- / ---- Corrugated Carton
Dimensions: ---- mm(W) ---- mm(D) ---- mm(H)
Desc ripti on of Origin Yes No

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: Yes No

Drop Test Nat 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 ter Channel Film
Battery (UM- 4 x 2 ) Remote C ontrol Unit
Safety Tip Toll Free Insert Sheet
Guarantee Card Audio-Vide o Cord ( R CA)
Re gis tra tion C a rd Warning Sheet
Quick Set-Up She et Sche matic Diagram
Informa t i o n S h ee t U/V M i xer
75 ohm Coa xi a l C a bl e ( Single Shield Double S hie l d)
300 ohm to 75 ohm VHF Ante nna Ada ptor
21pin Ca bl e Car Cord
Rod Ante nna

Loop Antenna ( F-Type Din Type France Type)

G-31.Othe r F e a ture s

Auto Dega uss Auto Search Full OSD
Auto S h ut Off CH Allocation Premiere
Canal+ SAP Comb Filter
CATV(181CH) Cha nne l Lock Auto CH Memory
Anti-Theft Just C loc k F unc t ion Hotel Lock
Rental Game Position Fastext
Unitext TopText Closed Caption
Picture Menu M id Night The a t e r V-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

Height 25cm 31cm 46cm 62cm 80cm

One P o l e Two Pole ( F-Type Din Type France Type)

A3- 3

GENERAL SPECIFICATIONS

G-32.Switch

Front

Power( Tact) Channel Up/Reset Volume Up/Set Up
System Select Cha nne l Down/Ente r Volu m e Do wn/ S et Down
Main Power SW Sub P owe r Me n u:Vol UP + Vol Down

Rear

AC/DC TV/CATV Selector
Degauss Main Power SW

G-33.Magnet ic F i e ld

BV : +0.45G BV : +0.35G BV : +0.25G
BH : 0.18G BH : 0.30G B H : 0.30G
BV : -0.15G BV : -0.25G BV : -0.50G
BH : 0.15G BH : 0.15G BH : 0.30G

G-34.Remote Control Unit: RC- 74

Glow in Dark Remocon Yes No
Power Source: D.C 3 V Battery UM - 4 x 2
Total 26 Key

Power Quick Vi ew TV/A V
Stand By Status Bar Select
0 Time Sele c t PAL/SECAM
1 Time Set Volume Up
2 Muting Volu m e Do wn
3 CH Skip CH Call
4 CH1/CH2 C H Do wn
5 Channel CH Up
6 Text/Mix/TV CH Do wn/ P age Down
7 Displa y C a nc e l CH Up/Page Up
8 Initial Pa ge + /­ 9 Store Program
10 Reveal F/T/B
11 Sleep Hold
12 Aft/Skip List
1 Preset Rotate
2 5.5/6.5MHz Browse
0/10 Auto Memory Std/Auto
Tone 1/ 2 Auto Memory
Info Call Ba nd S e lect
Mono/Auto Reset Search
TV/Caption/Text Menu Clock/Program
Expand Enter Clock/Set
Red Add Ch Set
Cyan Dele te Set +
Normal Yellow Se t ­Color System Random Green
Wide Selecy Tuning Up/Tim e Te xt Nica m/Mono
Auto W i d e On / Off Tuning Down/Re se t Tone A/B
Picture Position Navi F M Transmitter
Direct Change/Auto Search Back Light
Picture Menu Mid Night The a te r Audio Se le ct

A3- 4

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