Akira CT-14CAS5CP Manual de usuario

Color

or T

r TV

Model:

T-

-1

A-

-1

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CONTENTS

SAFETY INSTRUCTIONS AND MAINTENANCE.......................................................................... 4

SAFETY PRECAUTION .......................................................................................................................................... 5

PRODUCT SAFETY NOTICE ................................................................................................................................. 6

SAFETY SYMBOL DESCRIPTION ........................................................................................................................ 7

MAINTENANCE ..................................................................................................................................................... 8

MECHANICA DISASSEMBLING .........................................................................................................9

ADJUSTMENTS.................................................................................................................................. 11

SET-UP ADJUSTMENTS....................................................................................................................................... 11

CIRCUIT ADJUSTMENTS .................................................................................................................................... 14

STRUCTURE AND CHASSIS FUNCTION DESCRIPTION......................................................... 20

STRUCTION BLOCK DIAGRAM......................................................................................................................... 20

SERVICE DATA.................................................................................................................................. 22

TECHNICAL DATA OF KEY ICs ......................................................................................................................... 22

SERVICE DATA OF KEY ICs ............................................................................................................................... 43

APPENDIX.......................................................................................................................................... 47

CIRCUIT DIAGRAM

PARTS LIST

Please read this manual carefully before service.

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SERVICE SAFETY AND MAINTENANCE

WARNING:

BEFORE EXAMINING AND SERVICING

THIS CHASSIS READ CAREFULLY

THE FOLLOWING SAFETY

INSTRUCTIONS.

X-RAY RADIATION PRECAUTION

1. The EHT must be checked every time the TV is serviced to ensure that the CRT does

not emit X-ray radiation as result of excessive EHT voltage. The maximum EHT voltage

permissible in any operating circumstances must not exceed the rated value. When

checking the EHT, use the High Voltage Check procedure in this manual using an

accurate EHT voltmeter.

2. The only source of X-RAY radiation in this TV is the CRT. The TV minimizes X-RAY

radiation, which ensures safety during normal operation. To prevent X-ray radiation,

the replacement CRT must be identical to the original fitted as specified in the parts list.

3. Some components used in this TV have safety related characteristics preventing the

CRT from emitting X-ray radiation. For continued safety, replacement component

should be made after referring the PRODUCT SAFETY NOTICE below.

4. Service and adjustment of the TV may result in changes in the nominal EHT voltage of

the CRT anode. So ensure that the maximum EHT voltage does not exceed the rated

value after service and adjustment.

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SAFETY PRECAUTION

WARNING:

REFER SERVICING TO

QUALIFIED SERVICE

PERSONNEL ONLY.

1. The TV has a nominal working EHT voltage. Extreme caution should be exercised when

working on the TV with the back removed.

a. Do not attempt to service this TV if you are not conversant with the precautions

and procedures for working on high voltage equipment.

b. When handling or working on the CRT, always discharge the anode to the TV

chassis before removing the anode cap in case of electric shock.

c. The CRT, if broken, will violently expel glass fragments. Use shatterproof

goggles and take extreme care while handling.

d. Do not hold the CRT by the neck as this is a very dangerous practice.

2. It is essential that to maintain the safety of the customer all power cord forms be replaced

exactly as supplied from factory.

3. Voltage exists between the hot and cold ground when the TV is in operation. Install a

suitable isolating transformer of beyond rated overall power when servicing or connecting

any test equipment for the sake of safety.

4. When replacing ICs, use specific tools or a static-proof electric iron with small power (below

35W).

5. Do not use a magnetized screwdriver when tightening or loosing the deflection yoke

assembly to avoid electronic gun magnetized and decrement in convergence of the CRT.

6. When remounting the TV chassis, ensure that all guard devices, such as nonmetal control

buttons, switch, insulating sleeve, shielding cover, isolating resistors and capacitors,

are installed on the original place.

7. Replace blown fuses within the TV with the fuse specified in the parts list. 8. When

replacing wires or components to terminals or tags, wind the leads around the terminal

before soldering. When replacing safety components identified by the international

hazard symbols on the circuit diagram and parts list, it must be the company-approved

type and must be mounted as the original.

8. Keep wires away from high temperature components.

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PRODUCT SAFETY NOTICE

CAUTION:

FOR YOUR PROTECTION

THE FOLLOWING PRODUCT SAFETY NOTICE

SHOULD BE READ CAREFULLY BEFORE

OPERATING AND SERVICING THIS TV SET.

1. Many electrical and mechanical components in this chassis have special safety-related

characteristics. These characteristics are often passed unnoticed by a visual inspection

and the X-ray radiation protection afforded by them cannot necessarily be obtained by

using replacements rated at higher voltages or wattage, etc. Components which have

these special safety characteristics in this manual and its supplements are identified by the

international hazard symbols on the circuit diagram and parts list. Before replacing any of

these components read the parts list in this manual carefully. Substitute replacement

components which do not have the same safety characteristics as specified in the parts list

may create X-ray radiation.

2. Do not slap or beat the cabinet or CRT, since this may result in fire or explosion.

3. Never allow the TV sharing a plug or socket with other large-power equipment. Doing so

may result in too large load, causing fire.

4. Do not allow anything to rest on or roll over the power cord. Protect the power cord from

being walked on, modified, cut or pinched, particularly at plugs.

5. Do not place any objects, especially heavy objects and lightings, on top of the TV set. Do

not install the TV near any heat sources such as radiators, heat registers, stove, or other

apparatus that produce heat.

6. Service personnel should observe the SAFETY INSTRUCTIONS in this manual during use

and servicing of this TV set. Otherwise, the resulted damage is not protected by the

manufacturer.

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SAFETY SYMBOL DESCRIPTION

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MAINTENANCE

1. Place the TV set on a stable stand or base that is of adequate size and strength to

prevent it from being accidentally tipped over, pushed off, or pulled off. Do not

place the set near or over a radiator or heat register, or where it is exposed to direct

sunlight.

2. Do not install the TV set in a place exposed to rain, water, excessive dust,

mechanical vibrations or impacts.

3. Allow enough space (at least 10cm) between the TV and wall or enclosures for

proper ventilation.

4. Slots and openings in the cabinet should never be blocked by clothes or other

objects.

5. Please power off the TV set and disconnect it from the wall immediately if any

abnormal condition are met, such as bad smell, belching smoke, sparkling,

abnormal sound, no picture/sound/raster. Hold the plug firmly when disconnecting

the power cord.

6. Unplug the TV set from the wall outlet before cleaning or polishing it. Use a dry soft

cloth for cleaning the exterior of the TV set or CRT screen. Do not use liquid

cleaners or aerosol cleaners.

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MECHANICA DISASSEMBLIES

CABINET BACK REMOVAL

1. Refer to Figure 1, remove 7screws.

2. Pull off cabinet back and remove.

CHASSIS REMOVAL

Remove cabinet back.

Discharge the picture tube anode (2nd anode lead) to the dag coating (picture tube

grounding lead).

3. Disconnect Degaussing coil socket (KE). Picture tube socket, Deflection yoke connector

(KDY). Speaker connectors (KL and KR), and 2nd anode lead.

4. Remove chassis completely by sliding it straight back.

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PICTURE TUBE REMOVAL

CAUTION: Do not disturb the deflection yoke or magnet assembly on the picture tube Neck.

Care must be taken to keep these assemblies intact, unless picture tube is being replaced.

Discharge the picture tube to the coating before handing the Tube.

1. Remove chassis, referring to Chassis Removal instructions.

2. Place cabinet front face down on the soft surface.

3. Remove the screw one ach corner of the picture tube and GENTLY lift the picture tube out

of the cabinet.

4. Install a replacement picture tube in reverse order.

5. Properly install the degaussing coil and picture tube grounding lead on the picture tube.

SeeFigure2.

Note: If the Picture Tube is being replaced, mount the Degaussing Coi l on the picture tube. See

following Figure1.Cabinet Back Removal

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