Use the following instructions for returning color CRTs, whether in-warranty or out-of-warranty. Any high voltage that may be present is safely discharged to ground circuits (on the power/sweep assembly), which are

When discharging a CRT, use only the ground lug to make your ground connection on a Macintosh to prevent damage to the logicīoard. Refer to Knowledge Base document 50078, “About CRT Safety,” for instructions on establishing an ongoing lead.

Disconnect the snap fastener on the grounded workbench mat until the CRT has been discharged.

Remove the grounding wrist or heel strap until the CRT has been discharged.

Turn off the power and disconnect the AC power cord before you remove the CRT cover.

Having someone nearby in case of an accident could save your life. To work safely on a CRT inside a Macintosh, follow these safety rules every time: If you accidentally contact high voltage, the current has a clear path through Mat create a path through your body to ground. Thus doing so requires an exception to the ESD rules.īeing grounded in these situations is extremely dangerous because your grounded ESD wrist or heel strap and grounded ESD workbench However, working around a CRT inside a Macintosh, or working around the inside of any Macintosh while it is powered on, canīring parts of your body dangerously close to hazardous voltages. Up an ESD-compliant workstation and consistently following all ESD rules. In typical repair situations, you should always follow ESD precautions while working inside a Macintosh. If you must transport a CRT module, always make sure that it is in a shipping package or installed in the computer.ĭangerously high voltages flow through these parts until the display is disconnected from its power source and properly discharged.ĭo not touch any of these parts inside the product housing until after the display is disconnected from its power source and

It is also important to handle CRT modules carefully when lifting them or Glass, you should never lift a CRT by the neck. Handling CRTs correctly consists of not placing stress on the neck portion of the CRT assembly. There are several CRT safety procedures that If you handle a CRT properly, neither you nor the display will come to any harm. You could electrocute yourself unless you handle theĭisplay using the appropriate safety procedures. If the CRT is broken or cracked, these materials mayīe released and pose a risk of toxic exposure.Ī charged CRT carries high voltage-about 27,000 volts in a color unit. Vacuum in the CRT, spraying broken glass in every direction.Ĭolor CRTs may contain mercury or other potentially toxic materials. The surrounding air will rush violently into the unsealed The vacuum tube in a CRT can implode if it is broken or punctured. This makes a CRT fairly fragile when it is not encased in a computer or bezel. They have very thick glass in the screen area and thinner glass That you know what to do and what not to do when troubleshooting and servicing Macintosh computers that contain them.ĬRTs are glass vessels that have the air pumped out of them. Yet because of the risks inherent in working with CRTs, it is extremely important Happily, there are very few occasions when you should The CRT is one of the most dangerous pieces of equipment you’ll repair. If you are not an Apple Authorized Service Provider (AASP) or in a certified training course, you should not At some point, you may have to service a CRT system.īetween the changing and improving technology and the lowering of prices, attempting to fix a CRT unit should rarely be yourįirst option. While CRT-based Macintosh systems are no longer sold, they will be a part of the supported product line for years From June 2002 until mid-2006, the eMac was sold to schools and some private Only one model, the eMac, has been available. Over the last few years, cathode-ray tube (CRT) displays have been used in fewer and fewer computers. ASTURIAS:ATS DESKTOP & PORT SYST_p3, 3rd Edition

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