Toshiba 21J1H Panduan Servis - Halaman 3

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CHAPTER 1

GENERAL ADJUSTMENTS

WARNING: BEFORE SERVICING THIS CHASSIS, READ THE "X-RAY RADIATION PRECAUTION", "SAFETY PRECAU-

TION" AND "PRODUCT SAFETY NOTICE" INSTRUCTIONS BELOW.

1. Excessive high voltage can produce potentially hazard-

ous X-RAY RADIATION. To avoid such hazards, the high

voltage must not be above the specified limit. The nominal

value of the high voltage of this receiver is (A) kV at zero

beam current (minimum brightness) under a (C) V AC power

source. The high voltage must not, under any circum-

stances, exceed (B) kV.

Refer to table-1 for high voltage (A), (B) & AC voltage (C).

(See SETTING & ADJUSTING DATA on page 13)

Each time a receiver requires servicing, the high voltage

should be checked following the HIGH VOLTAGE CHECK

procedure in this manual. It is recommended that the read-

ing of the high voltage be recorded as a part of the service

record. It is important to use an accurate and reliable high

voltage meter.

WARNING : Service should not be attempted by anyone unfamiliar with the necessary precautions on this receiver. The following

are the necessary precautions to be observed before servicing this chassis.

1. An isolation transformer should be connected in the power line between the receiver and the AC line before any service is

performed on the receiver.

2. Always discharge the picture tube anode to the CRT conductive coating before handling the picture tube. The picture tube

is highly evacuated and if broken, glass fragments will be violently expelled. Use shatter proof goggles and keep picture tube

away from the unprotected body while handling.

3. When replacing a chassis in the cabinet, always be certain that all the protective devices are put back in place, such as; non-

metallic control knobs, insulating covers, shields, isolation resistor-capacitor network etc.

Many electrical and mechanical parts in this chassis have special safety-related characteristics. These characteristics are

often passed unnoticed by a visual inspection and the protection afforded by them cannot necessarily be obtained by using

replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety char-

acteristics are identified in this manual and its supplements; electrical components having such features are identified by

the international hazard symbols on the schematic diagram and the parts list.

Before replacing any of these components, read the parts list in this manual carefully. The use of substitute replacement

parts which do not have the same safety characteristics as specified in the parts list may create shock, fire, X-ray

radiation or other hazards.

SAFETY INSTRUCTIONS

X-RAY RADIATION PRECAUTION

2. The only source of X-RAY RADIATION in this TV receiver

is the picture tube. For continued X-RAY RADIATION pro-

tection, the replacement tube must be exactly the same

type tube as specified in the parts list.

3. Some part in this receiver have special safety-related char-

acteristics for X-RAY RADIATION protection. For contin-

ued safety, parts replacement should be undertaken only

after referring to the PRODUCT SAFETY NOTICE below.

SAFETY PRECAUTION

PRODUCT SAFETY NOTICE

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