ViewSonic P90F Service Manual download pdf (Page 5)

ViewSonic Corporation

PRECAUTIONS AND NOTICES

1.1

SAFETY PRECAUTIONS

1) Observe all cautions and safety related notes located inside the display cabinet and on the

displaychassis.

2) Operation of this display outside the cabinet or with the cover removed, involves at shock

harzard from the display power supplies. Work on the display should not be attempted by anyone

who is not thoroughly familiar with precautions necessary when working on high voltage

equipement.

3) Do not install, remove or handle the picture tube in any manner unless shatter-proof goggles

are worn. People not so equiped should be kept away while handling picture tube.Keep picture

tube away from body while handling.

1.2 Observe all cautionary and safety related notes located on the chassis, cabinet and display tube.

1.3 Operation of the monitor with the back cover removed presents a potential shock hazard. Only

personnel familiar with the precautions necessary for safe working on high voltage equipment

should attempt to carry out servicing.

1.4

Always wear shatter proof goggles when removing, installing or generally handing the picture tube.

People not so equipped should be kept at a safe distance when any such handing is being

undertaken. Do not handle the picture tube by the neck of deflection coil. Do not carry the picture

tube resting against the body.

1.5

The picture tube is designed and constructed to limit X-Radiation to a safe level during normal

operation. To maintain the required level of protection and safe operation, replacement tubes

must be correctly adjusted and any protective circuits must not defeat.

1.6

IMPORTANT-Safety Tests

After servicing, and before returning the monitor to the user, a thorough safety test must be

carried out to ensure there is no potential shock hazard to any operator(s) using the monitor.

All the following test must be performed. A monitor failing any of these tests should be rejected

and have the problem rectified.

1.7

A.C. Leakage Test

Remove the power sourse. Connent the monitor to the circuir as in figure 1 below. Switch the

monitor on/off switch to on. A reading of less than 3.5mA should obtained (ref. EN60950).

Equipment safety

Earth terminal

Equipment

Under test

Measuring instrument

Isolating

transformer

Fig.1 Measurement of AC Leakage Current.

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ViewSonic P90F Service Manual Page 5

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