Durabrand DBTV2500SM.pdf

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

OEC7044A

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,

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.

Safety is secured against an X-ray by consider-

ing about the cathode-ray tube and the high

voltage peripheral circuit, etc.

Therefore, when repairing the high voltage pe-

ripheral 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 cathode-

ray 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.

PUT PARTS AND WIRES IN THE

ORIGINAL POSITION AFTER

ASSEMBLING OR WIRING

(INSULATION CHECK PROCEDURE)

Unplug the plug from the AC outlet.

Remove the antenna terminal on TV and turn

on the TV.

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

[Note1] .

If the insulation resistance is less than 1M

ohm, the inspection repair should be

required.

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 cathode-

ray 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.

[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

A2-1

A3-1~A3-4

B-1, B-2

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

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