Safety.pdf

AppleCare Service Source

http://service.info.apple.com/safety/safety.html#ESD

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AppleCare Service Source

http://service.info.apple.com/safety/safety.html#ESD

Safety Information

For your safety and the safety of others, review and follow all electrostatic discharge precautions,

cathode-ray tube (CRT) procedures, and battery handling precaution documentation presented in this

section.

I. ESD Damage Prevention

Follow these guidelines to reduce the risk of electrostatic discharge (ESD) damage to equipment.

ESD Prevention Rules

Setting Up an ESD-Safe Workstation

II. CRT and LCD Safety

It's imperative to know and follow all CRT safety procedures listed in this section.

CRT Safe Electrical Setup Precautions

Discharging the Cathode Ray Tube (CRT)

Removing the CRT/Video Board

Establishing an Ongoing Lead to Ground

Return Worn-Out CRTs

LCD Safety

III. Battery Handling

A primer on battery handling and disposal.

Battery Disposal

I. ESD Damage Prevention

ESD Prevention Rules

Setting Up an ESD-Safe Workstation

ESD Prevention Rules

Leads

Handle all ICs by the body. Do not touch the leads. Also, do not touch the edge

connectors on exposed circuitry, or printed circuits on boards or cards. Handle ICs,

boards, and cards by the edges, or use extractors.

Grounds

Before working on any device containing a printed circuit, ground yourself and your

equipment to an earth or building ground. Use a grounded conductive workbench mat

and grounding wriststrap, and ground your equipment to the mat.

Warning: Make sure you are not grounded when

You work on plugged-in equipment

You discharge a cathode ray tube (CRT)

You work on an unplugged CRT that has not yet been discharged

You are performing live adjustments

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Metals

Never place components on any metal surface (such as a metal filing cabinet). Use

antistatic, conductive, or foam rubber mats.

Return to Start of Section

Bodies

Do not touch anybody who is working on integrated circuits. If that person is properly

grounded, your zap may not cause any damage, but just to be on the safe side, do not

touch or brush against other technicians.

Bags

Use static-shielding bags during storage, transportation, and handling of boards and

chips. When you are ready to leave your bench and take a board to a storage place, put

the board in a static-shielding bag. Leave all Apple replacement modules in their

ESD-safe packaging until you need them.

Synthetics

Do not wear polyester clothing or bring plastic, vinyl, or styrofoam into the work

environment. The electrostatic field around these nonconductors cannot be removed.

Atmosphere

If possible, keep the humidity in the service area between 70% and 90%, and use an

ion generator. Charge levels are reduced (but not eliminated) in high-humidity

environments and in areas where an ion generator is routinely used.

Return to Start of Section

Setting Up an ESD-Safe Workstation

To prevent electrical shock, you will need to make an exception to these guidelines when performing

certain tasks on a CRT. When there is a risk of contacting high voltage, such as when you discharge a

CRT or work with a powered-on CRT, do not wear a grounding wriststrap or heelstrap, and do not work

on a grounded pad.

Materials Required

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AppleCare Service Source

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You will need the following materials to set up an ESD-safe workstation:

Conductive workbench mat

Wriststrap, with 1 megohm resistor and ground cord

Wire lead with alligator clips

Ground/polarity tester

Setup Procedure

Follow these steps to set up an ESD-safe workstation:

Remove all ESD hazards from the area including the following nonconductive materials:

Styrofoam

Common plastics

Synthetic clothing

Vinyl

Since these nonconductive materials cannot be grounded and can retain a charge for hours and

even days, the static field surrounding them, when discharged, can easily damage sensitive

components.

Use a ground/polarity meter to verify proper grounding of the power outlet. Though

ground/polarity testers vary slightly in design, all are very easy to use. To use a tester, simply

insert the three prongs of the tester into the three-pronged outlet. Most testers will display a light

pattern that, when matched to the code on the tester, indicates whether the outlet has proper

grounding. Connect the grounding cord of the workbench mat to ground.

Connect the end of the ground cord that contains the solderless terminal to ground.

Attach the snap fastener of the grounding cord to the snap on the workbench mat. Then, slip the

wriststrap onto your wrist, allowing the metal part of the wriststrap to touch your skin.

All objects in the service area should be grounded to the same potential. Touching the chassis of

a machine will bring you to the same potential as the machine. However, since the act of

shifting your weight from one foot to the other can generate static charge, momentary touch

grounding is not enough. You need the continuous grounding provided by a grounding

wriststrap.

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Ground the equipment you are working on. Note: The product should not be plugged into the

wall outlet.

If you are working on a product that has a three-pronged power cord, you can attach the ground

pin to the conductive workbench mat using a wire lead with alligator clips. Put one clip on the

snap of the mat and the other on the ground pin.

Or, if you have a grounding cord with alligator clips, attach the clip to any metal part of the

device you are working on.

Return to Start of Section

Return to Top of Page

II. CRT Safety

CRT Safe Electrical Setup Precautions

Discharging the Cathode Ray Tube (CRT)

Removing the CRT/Video Board

Establishing an Ongoing Lead to Ground

Return Worn-Out CRTs

LCD Safety/Return Worn-Out LCDs

Return to Top of Page

CRT Safe Electrical Setup Precautions

A cathode-ray tube (CRT) provides the video display for the Macintosh or Performa compact computers,

modular monitors, and Apple II computers. The CRT is a picture tube that operates at very high

voltages and contains a high vacuum. If cracked or broken, the CRT can implode (collapse into itself)

and scatter fragments of glass. When working on or near a CRT, follow all safety rules and take every

precaution against breaking the tube, especially at the neck where the tube is thinnest.

The following precautions must be taken to ensure your safety, especially when you are making

adjustments on a live CRT.

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