Symbol Colour

Explanation

 

 

Red

High voltage terminal at which a

 

voltage, with respect to an other

 

terminal, exists or may be

 

adjusted to 1000V or more.

Yellow/Black

Live part.

 

 

Yellow/Black

This marking indicates that the

 

operator must refer to an

 

explanation

in the

Instruction

 

Manual, or that a specific

 

component must be replaced by

 

the component specified in the

 

documentation for safety

 

reasons.

 

 

White/Black

Protective

earth

(ground)

 

terminal.

 

 

Cathode ray tubes

Components marked on the circuit diagram are critical for safety and include those specified to comply with X-ray emission standards for units using cathode ray tubes and those specified for compliance with various regulations regarding spurious radiation emission.

When servicing units that use cathode ray tubes (CRTs), the cathode ray tubes themselves, the high voltage circuits and related circuits are specifically chosen so that they comply with recognized codes pertaining to X-ray emission.

Consequently, when servicing, replace the cathode ray tubes and other parts with specified parts only. Do not attempt to modify these circuits as any unauthorized modification can increase the high voltage value and cause X-ray emission from the cathode ray tube.

Handle the cathode ray tube only when wearing shatterproof goggles and after discharging the high voltage completely.

Earthing

The rear of a CPU has two separate screw terminals for

protective earth (PE) and video earth (VE).

VE

Metal strap

PE

These are normally connected by a metal strap. The protective earth terminal is internally connected to the protective earth conductor of the power cable. If required, the central earth connection wire of the studio can be connected to terminal PE.

In normal circumstances the connection between the protective earth and the video earth should not be broken.

The metal strap may be removed only if the studio (or OB van) is equipped with separate protective and video earth systems. Under these circumstances the video earth terminal must be connected to the central functional earth potential (video earth) of the studio. This earth potential should have functional protective and noiseless earth (FPE) qualities as stated in the VDE regulation 0800/part2. A low impedance interconnection of both earth conductors must be provided at the central studio earthing point.

WARNING

THE UNIT MUST ALWAYS BE CONNECTED TO

PROTECTIVE EARTH.

Mains Lead Wiring for UK Users

The wires in the mains lead are coloured in accordance with the following code:

GREEN AND YELLOW

-

EARTH

BLUE

-

NEUTRAL

BROWN

-

LIVE

As the colours of the wires in the mains lead of this apparatus may not correspond with the coloured markings identifying the terminals in your plug proceed as follows:

The wire coloured GREEN AND YELLOW must be connected to the terminal on the plug marked with the letter E or by the safety earth symbol or coloured GREEN or GREEN AND YELLOW.

The wire coloured BROWN must be connected to the terminal marked with the letter L or coloured RED.

The wire coloured BLUE must be connected to the terminal marked with the letter N or coloured BLACK.

Ensure that your equipment is connected correctly - if you are in any doubt consult a qualified electrician.

Safety Instructions

Technical Manual LDK 20(S) - Studio Camera

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Technicolor - Thomson LDK 20(S) technical manual Earthing, Cathode ray tubes