IBM Security Camera 343 Manual de usuario Pagina 140

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128 xSeries 343 Hardware Maintenance Manual
The guide consists of a series of steps presented in a checklist. Begin the checks with the power
off, and the power cord disconnected.
Checklist:
1. Check exterior covers for damage (loose, broken, or sharp edges).
2. Power-off the computer. Disconnect the power cord.
Check the power cord for:
a. A third-wire ground connector in good condition. Use a meter to measure third-wire
ground continuity for 0.1 ohm or less between the external ground pin and frame ground.
b. The power cord should be the appropriate type as specified in the parts listings.
c. Insulation must not be frayed or worn.
3. Remove the cover.
4. Check for any obvious non-IBM alterations. Use good judgment as to the safety of any non-
IBM alterations.
5. Check inside the unit for any obvious unsafe conditions, such as metal filings, contamination,
water or other liquids, or signs of fire or smoke damage.
6. Check for worn, frayed, or pinched cables.
7. Check that the power-supply cover fasteners (screws or rivets) have not been removed or
tampered with.
Handling Electrostatic Discharge-sensitive Devices
Any computer part containing transistors or integrated circuits (ICs) should be considered sensitive
to electrostatic discharge (ESD). ESD damage can occur when there is a difference in charge
between objects. Protect against ESD damage by equalizing the charge so that the machine, the
part, the work mat, and the person handling the part are all at the same charge.
Notes
1. Use product-specific ESD procedures when they exceed the requirements noted here.
2. Make sure that the ESD protective devices you use have been certified (ISO 9000) as fully
effective.
When handling ESD-sensitive parts:
Keep the parts in protective packages until they are inserted into the product.
Avoid contact with other people.
Wear a grounded wrist strap against your skin to eliminate static on your body.
Prevent the part from touching your clothing. Most clothing is insulative and retains a charge
even when you are wearing a wrist strap.
Use the black side of a grounded work mat to provide a static-free work surface. The mat is
especially useful when handling ESD-sensitive devices.
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