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Service Hints & Tips |
Document ID: GSMH-3CEGZS |
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This document is provided to IBM and our Business Partners to help sell and/or service IBM products. It is not to be distributed beyond that audience or used for any other purpose. |
IBM ValuePoint - Safety information
Applicable to: World-Wide
Moving the Computer:
The PS/ValuePoint computer top-cover assembly slides onto the base frame and is held in place by the cover-release latch (or latches) and cover lock. Before moving the computer, make sure that the cover is latched and the cover lock is in the locked position.
6382/S, 6384/D, 6387/T System Boards:
Important:
6382 /S, 6384 /D, and 6387 /T Type 2 system boards are longer than type 1 system boards. When replacing a system board replace type 1 only with type 1 and type 2 only with type 2.
Safety Information:
The following section contains the safety information required to service a PS/ValuePoint computer. Familiarize yourself with this information before servicing a PS/ValuePoint computer.
General Safety:
Use these rules to ensure general safety:
Observe good housekeeping in the area of the machines during maintenance and after completing it.
When lifting any heavy object:
1. Ensure you can stand safely without slipping.
2. Distribute the weight of the object equally between your feet.
3. Use a slow lifting force. Never move suddenly or twist when you attempt to lift.
4. Lift by standing or by pushing up with your leg muscles; this action removes the strain from the muscles in your back. Do not attempt to lift any objects that weigh more than 16 kg (35 lb) or objects that you think are too heavy for you.ñ Do not perform any action that causes hazards to the customer or that makes the equipment unsafe. Before you start the machine, ensure that other service representatives and the customer's personnel are not in a hazardous position. Put removed covers and other parts in a safe place, away from all personnel, while you are servicing the machine. Keep your tool case away from walk areas so that other people will not trip over it; for example, put it under a desk or table. Do not wear loose clothing that can be trapped in the moving parts of a machine. Ensure that your sleeves are fastened or rolled up above your elbows. If your hair is long, fasten it. Insert the ends of your necktie or scarf inside other clothing or fasten the necktie with a clip, preferably nonconductive, approximately 8 cm (3 in.) from the end. Do not wear jewelry, chains, metal-frame eyeglasses, or metal fasteners for your clothing.
Remember:
Metal objects are excellent conductors.
Wear safety glasses when you are:
- Using a hammer to drive pins or similar parts
- Drilling with a power hand-drill
- Using spring hooks or attaching springsý Soldering parts
- Cutting wire or removing steel bands
- Cleaning parts with solvents, chemicals, or cleaning fluids
- Working in any other conditions that might be hazardous to your eyes.
After maintenance, reinstall all safety devices such as shields, guards, labels, and ground wires. Exchange any safety device that is worn or defective for a new one.
Remember:
Safety devices protect personnel from hazards. You destroy the purpose of the devices if you do not reinstall them before completing your service call. Reinstall all covers correctly before returning the machine to the customer.
Safety Inspection Guide:
The intent of this inspection guide is to assist you in identifying potentially unsafe conditions on these products. Each machine, as it was designed and built, had required safety items installed to protect users and service personnel from injury. This guide addresses only those items. However, good judgment should be used to identify potential safety hazards due to attachment of non-IBM features or options not covered by this inspection guide.
If any unsafe conditions are present, you must determine how serious the apparent hazard could be and whether you can continue without first correcting the problem.
Consider these conditions and the safety hazards they present:
Electrical hazards, especially primary power: primary voltage on the frame can cause serious or fatal electrical shock. Explosive hazards, such as a damaged CRT face or bulging capacitor, can cause serious injury. Mechanical hazards, such as loose or missing hardware, can cause serious injury. The guide consists of a series of steps presented in a checklist. Begin the checks with the power-off and the power cord removed from the power receptacle.
Checklist:
1. Check exterior covers for damage (loose, broken, or sharp edges).
2. Power-off the computer. Disconnect the power cord from the electrical outlet.
3. 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. Insulation must not be frayed or worn.
4. Remove the cover.
5. Check for any obvious non-IBM alterations. Use good judgment as to the safety of any non-IBM alterations.
6. 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.
7. Check for worn, frayed, or pinched cables.
8. Check that the power-supply cover fasteners (screws or rivets) have not been removed or tampered with.
Changing the Battery:
Follow any special handling and installation instructions supplied with the replacement battery.
CAUTION:
A danger of explosion exists if battery is incorrectly replaced.
Replace with only the same or equivalent type recommended by the manufacturer. Dispose of used batteries according to the manufacturer's instructions.
Handling Electrostatic Discharge (ESD) 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. Select a grounding system, such as those listed below, to provide protection that meets the specific service requirement.
Note:
The use of a grounding system is desirable but not required to protect against ESD damage.
- Attach the ESD ground clip to any frame ground, ground braid, or green-wire ground.
- Use an ESD common ground or reference point when working on a double-insulated or battery-operated computer. You can use coax or connector-outside shells on these computers.
- Use the round ground-prong of the AC plug on AC-operated computer.
Electrical Safety:
Observe the following rules when working on electrical equipment. Find the room emergency power-off (EPO) switch or disconnecting switch. If an electrical accident occurs, you can then operate the switch quickly. Do not work alone under hazardous conditions or near equipment that has hazardous voltages.
Disconnect all power:
- Before doing a mechanical inspection
- Before working near power supplies
- Before removing or installing main units
- Before you start to work on the machine, unplug its power cable. If you cannot unplug the cable, ask the customer to switch off
the wall box that supplies power to the machine and to lock the wall box in the off position. If you need to work on a machine that has exposed electrical circuits, observe the following precautions:
Ensure that another person, familiar with the power-off controls, is near you.
Remember:
Another person must be there to switch off the power, if necessary.
CAUTION:
Some hand tools have handles covered with a soft material that does not insulate you when working with live electrical currents. Use only approved tools and testers.
- Use only one hand when working with powered on electrical equipment; keep the other hand in your pocket or behind your
back.
Remember:
There must be a complete circuit to cause electrical shock. By observing the above rule, you might prevent a current from passing through your body.
- When using testers, set the controls correctly and use the approved probe leads and accessories for that tester.
CAUTION:
Many customers have, near their equipment, rubber floor mats that contain small conductive fibers to decrease electrostatic discharges. Do not use this type of mat to protect yourself from electrical shock.
- Stand on suitable rubber mats (obtained locally, if necessary) to insulate you from grounds such as metal floor strips and machine frames.
Observe the special safety precautions when you work with very high voltages; these instructions are in the safety sections of maintenance information. Use extreme care when measuring high voltages. Regularly inspect and maintain your electrical hand tools for safe operational condition. Do not use worn or broken tools and testers. Never assume that power has been disconnected from a circuit. First, check that it has been switched off. Always look carefully for possible hazards in your work area. Examples of these hazards are moist floors, nongrounded power extension cables, power surges, and missing safety grounds. Do not touch live electrical circuits with the reflective surface of a plastic dental mirror. The surface is conductive; such touching can cause personal injury and machine damage.
Do not service the following parts with the power on when they are removed from their normal operating places in a machine:
- Power supply units Pumps
- Blowers and fans
- Motor generators and similar units. (This practice ensures correct grounding of the units.)
If an electrical accident occurs:
- Use caution; do not become a victim yourself.
- Switch off power.
- Send another person to get medical aid.
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Hint Category |
Hardware Maintenance Information | |
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Date Created |
16-12-96 | |
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Last Updated |
08-05-98 | |
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Revision Date |
29-04-99 | |
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Brand |
IBM PC | |
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Product Family |
ValuePoint | |
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Machine Type |
6381, 6382, 6384, 6387 | |
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Model |
all | |
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TypeModel |
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Retain Tip (if applicable) |
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