Elekta CTR1498 Manuale - Pagina 2

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CAUTION: BEFORE SERVICING THE CHASSIS, READ THE' SAFETY PRECAUTION ",'X-RAY RADIA-
TION PRECAUTION " AND ' PROOUCT SAFETY NOTICE " ON PAGE 2 OF THIS MANUAL.
NOTICE:
THE POWER SUPPLY ClRCUIT OF THIS RECEIVER IS A " HOT " CHASSIS, THE REST ARE
" COLD " CHASSIS.

X-RAY RADIATION PRECAUTION

1.
Excessive high voltage can produce potentially hazardous-X-RAY RADIATION. To avoid such hazards, the high voltage
must not be above the specified limit. The normal value of th high voltaga of this receiver is 25kV at zero beam current
( minimum brightness ) under 220V AC power source. The high voltage must not, under any ciraurtstancss, exceed 26kV.
2.
Each time a receiver requires servicing, the high voltage should be checked following the HIGH VOLTAGE CHECK PROCEDURE
in this manual. It is recommended the reading 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.
3.
The primary source of X-RAY RADIATION in this TV receiver is the picture tube. For continued
X-RAY RADIATION protection, the replacement tuba must be exactly the same type tube as specfied in the parts list,
4.
Some parts in this receiverhave special-safety-related charaderistics for X-RAY RADIATION protection. For continued
safety, parts replacement should be undertaken only after referrfng to the PRODUCT SAFETY NOTICE below.
5.
The receiver is equipped with X-RAY RADIATION circuit. When the high voltage reach a set value, the circuit will set the
receiver to STAND BY mode to prevent the receiver from producing excessive amount of X-RAY RADIATION

SAFETY PRECAUTION

WARNING:
Service should not be attempted by anyone unfamiliar with the necessary precaution on this receiver. The following are the
necessary precautions to the observed before servicing this chassis.
1.
Since the power suppfy circuit of this receiver is directly connected to the AC power line, an isolation transformer should
be used during any dynamic service to avoid possible shock hazard.
2.
Always discharged 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 expeIied. 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 ara put back in place, such as:
non-metallic control knobs, Insulating covers, shields, isolation resistor-capacitor network etc,
4.
When replacing parts or cirduit boards, disconnect the power cord.
5.
When replacing a high voltage ressistor ( oxide metal film resistor ) on the circuit board. keep ihe resistor l0mm (1 / 2in)
away from circuit board.
6.
Connection wires must be kept away from components with high voltage or high temperature.
7.
If any fuse in this TV receiver is blown, replace it with the FUSE specified in the chassis parts list.
8.
The receiver is designed to operate with 220V ( 50Hz ) AC mains.
9.
Replace any components according to the requirement after reading the parts list in this manual.
PRODUCT SAFETY NOTICE
Many electrical und mechanical parts in the chassis have special safety-related characteristics. These characteristics are otten passed
unnoticed by a visual inspecson and the X-RAY RADIATION protection afforded by them cannot necessarily be obtained by using
replacement components rated for higher wattage, etc. Repladement parts which have tese special safety characteristics are identified
in this manual and its supplements electrical components having such features are shaded on the schematic diagram and the parts Iist.
Before replacing any of these components, read the parts list in this rnanual carefully. The use of substitute replacement parts which do
not have the same safety characteristic as specified in the parts list may create shock, fire, X-RAY RADIATION other or hazards.
.