Toshiba 2552DB Servis Kılavuzu - Sayfa 2

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SAFETV INSTRUCTIONS

WARNING: BEFORE SERVICING THIS CHASSIS, REAO THE "X-RAY RAOIATION PRECAUTION",

"SAFETY

PRECAUTION" ANO ·PRODUCT SAFETY NOTICE" INSTRUCTIONS BELOW.

X-RAY RADIATION

PRECAUTION

1. The

E.H.T.

must

be checked

every

time

the

receiver is serviced to ensure that the C.A.T. does

not emit X-ray radiation

as result

of excessive

E.H.T. voltage. The nominal E.H.T. for this receiver

is 26.5

kV at zero

beam

current

(minimum

brightness)

operating

at 240V a.e, The maximum

E.H.T.

voltage

permissible

in any

operating

circumstanees

must not exeeed 29.0 kV. When

cheeking the E.H.T., usa the 'High Voltage Check'

procedure in this manual using an aeeurate E.H.T.

voltmeter.

2. The only source of X-RAY radiation in this reeeiver

is the C.A.T.

To prevent

X-ray

radiation,

the

replaeement C.R.T. must be identical to the original

fitted as specified in the Parts List.

3. Some eomponents usad in this reeeiver have safety

related eharacteristics

preventing the C.A.T. from

emitting X-ray radiation.

For continuad

safety,

replaeement

component

should only be made after referring the Produet

Safety Notiee below.

SAFETY PRECAUTION

1. This receiver has a nominal working E.H.T. voltage

of 24.5 kV. Extreme eaution should be exercised

when

working

on the

reeeivar

with

the

baek

removed.

Do not attempt to service this receiver if you are

not conversant with the preeautions and procedures

for working on high voltage equlpment.

When handling or working on the C.A.T., a1ways

diseharge the anode to the receiver ehassis befo re

removing the anode eap

The C.A.T., if broken, will violently

expel

glass

fragments.

Use shatter proof

goggles

and take

extreme care while handling.

Do not hold the C.A.T. by the neek as this is a very

dangerous practice.

2. It is essential

that to maintain the safety of the

eustomer all eable forms be replaced exactly as

supplied from factory.

3. A small part of the chassis used in this receiver is,

when operating,

at approximately

half

mains

potential at· all times. It

therefore essential in the

interest of safety that when serving or connectíng

any test equipment the receiver should be supplied

via a suitable

isolatíng transformer

of adaquate

rating.

4. Raplaee blown fusas within the receivar with the

fuse specified in the parts list.

5. When replaeing wires or components

to terminals

or tags, wind the leads around the terminal before

soldering.

When

replaeing

safety

components

identified

by the international

hazard symbols

the circuit diagram

and parts list,

must be a

Toshiba approved type and must be mounted as

the original.

6. Keep wires away from high temperature

cornpo-

nents.

PRODUCT SAFETY NOTICE

Many electrical and meelianieal eomponents in this ehassis have special safety-related

characteristics.

These

characteristíes 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 wattaga,

etc.

Componants which haya these special safety characteristies in this manual and its supplements are identified by

the international

hazard symbols on the schematic

dlagram and parts list. Before replacing

any of these

components read the parts list in this manual carafully. Substituta replaeement eomponents which do not have

the same safety characteristics as specified in the

parts

llst may create X-ray radiation.

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