Precautions And Notices - ViewSonic P95f+-1 Service Manual

19” digital controlled color monitor

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Table Of Contents

Table of Contents

1.1 SAFETY PRECAUTIONS

1. Observe all caution and safety related notes located inside the display cabinet.

2. Operation of the display with the cover removed, may cause a serious shock hazard from the

display power supply. Work on the display should not be attempted by anyone who is not

thoroughly familiar with precautions necessary when working on high voltage equipment.

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

are worn. People who are not so equipped should be kept away while handling picture tube.

Keep picture tube away from the body while handling.

4. The picture tube is constructed to limit X-RAY radiation to 0.5 mR/HR. For continued

protection, use the designated replacement tube only, and adjust the voltages so that the

designated maximum rating at the anode will not be exceeded.

5. Symbol "★" means safety relative parts. The use of substitute replacement parts which do not

have the same characteristics as specified in the parts list may create shock, fire or explode

etc.

6. Symbol "

" means X-ray relative parts. Before replacing any of these components please

read the parts list in this manual carefully to avoid creating higher anode voltage or x-ray.

Especially for sealed controls, such as VR703, VR902 and FBT screen VR etc, which were

sealed by the manufacturer once their optimum position has been set, please don't dismantle

them as your likes, otherwise you will break or damage the component. If you need replace

the parts with sealed control, please adjust the relative VR to make sure the B+ voltage under

60.5KVdc and well seal it with A+B glue or equivalent, which you can not move away with one

screw driver.

7. Before returning a serviced display to the customer, a thorough safety test must be performed

to verify that the display is safe to operate without danger or shock. Always perform an AC

leakage current check on the exposed metallic parts of the cabinet, such as screw heads.

Test method for current leakage is described as follow.

(a) Plug the AC line cord directly into rated AC outlet (do not use a line isolation transformer

during this check).

(b) Use an AC voltmeter having 5000 ohms per volt or with more sensitivity in the following

manner: Connect a 1500 ohms 10 Watt resistor, paralleled by a 0.15UF, AC type capacitor

between a known good earth ground (water pipe, conduit, etc.) and the exposed metallic

parts simultaneously. Measure the AC voltage across the combination of 1500 ohms

resistor and 0.15UF capacitor.

exposed metallic part.

(d) Voltage measured must not exceed 0.5 Volts rms. This corresponds to 0.35 milliamp AC.

Any value exceeding this limit constitutes a potential shock hazard and must be corrected

immediately.

1-2 PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in this chassis have special safety visual inspections and

the protection afforded by them cannot necessarily be obtained by using replacement

components rated for higher voltage, wattage, etc. 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.

ViewSonic Corporation