29VH14P datasheet(2/70 Pages) TOSHIBA

Part #	29VH14P

Description	COLOUR TELEVISION

Download	70 Pages

Scroll/Zoom	100%

Manufacturer	TOSHIBA [Toshiba Semiconductor]

Direct Link	http://www.semicon.toshiba.co.jp/eng

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2 / 70 page

1. Precautions

1-1 Safety Precautions

1. Be sure that all of the built-in protective

devices are replaced. Restore any missing

protective shields.

2. When reinstalling the chassis and its

assemblies, be sure to restore all protective

devices, including: nonmetallic control knobs

and compartment covers.

3. Make sure that there are no cabinet openings

through which people—particularly

children—might insert fingers and contact

dangerous voltages. Such openings include

the spacing between the picture tube and the

cabinet mask, excessively wide cabinet

ventilation slots, and improperly fitted back

covers.

If the measured resistance is less than 1.0

megohm or greater than 5.2 megohms, an

abnormality exists that must be corrected

before the unit is returned to the customer.

4. Leakage Current Hot Check (Figure 1-1):

Warning: Do not use an isolation

transformer during this test. Use a leakage-

current tester or a metering system that

complies with American National Standards

Institute (ANIS C101.1, Leakage Current for

Appliances), and Underwriters Laboratories

(UL Publication UL1410, 59.7).

5. With the unit completely reassembled, plug

the AC line cord directly into the power

outlet. With the unit’s AC switch first in the

ON position and then OFF, measure the

current between a known earth ground (metal

water pipe, conduit, etc.) and all exposed

metal parts, including: antennas, handle

brackets, metal cabinets, screwheads and

control shafts. The current measured should

not exceed 0.5 milliamp. Reverse the power-

plug prongs in the AC outlet and repeat the

test.

Fig. 1-1 AC Leakage Test

6. Antenna Cold Check:

With the unit’s AC plug disconnected from the

AC source, connect an electrical jumper across

the two AC prongs. Connect one lead of the

ohmmeter to an AC prong. Connect the other

lead to the coaxial connector.

7. X-ray Limits:

The picture tube is especially designed to

prohibit X-ray emissions. To ensure continued

X-ray protection, replace the picture tube only

with one that is the same type as the original.

Carefully reinstall the picture tube shields and

mounting hardware; these also provide X-ray

protection.

8. High Voltage Limits:

High voltage must be measured each time

servicing is done on the B+, horizontal

deflection or high voltage circuits.

Correct operation of the X-ray protection

circuits must be reconfirmed whenever they

are serviced.

(X-ray protection circuits also may be called

“horizontal disable” or “hold-down”.)

Heed the high voltage limits. These include

the X–ray Protection Specifications Label, and

the Product Safety and X-ray Warning Note on

the service data schematic.

Precautions

1-1

LEAKAGE

CURRENT

TESTER

DEVICE

UNDER

TEST

TEST ALL

EXPOSED METAL

SURFACES

3-WIRE CORD

ALSO TEST WITH

PLUG REVERSED

(USING AC ADAPTER

PLUG AS REQUIRED)

EARTH

GROUND

(READING SHOULD

NOT BE ABOVE

0.5mA)

Follow these safety, servicing and ESD precautions to prevent damage and protect against potential

hazards such as electrical shock and X-rays.

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