Electronic Restoration >> How To Repair Cracked Circuit Boards

The abrasive and mildly corrosive nature of ash can damage computer and electronic systems. When possible, the best damage-preventive strategy is to shut down all computer, electric motors, and electronic systems until the ash has been completely removed from the equipment and the surrounding area, including air-supply How To Repair Cracked Circuit Boards and ventilation systems. 

Electrical panels can short out because of the high level of electrical conductivity of wet ash. For electronical systems and components, the goals are to keep ash out of electronics, controlling what gets in, and cleaning and disposing of the ash.Electric motors Ash can increase the wear on brushings, brushes, thrust bearings and How To Repair Cracked Circuit Boards commutators on electric pump motors and other drive motors. 

Small motors blanketed with ash can generate heat and could become fire hazards (FEMA, 1984).Recommendations for cleaning motors (FEMA, 1984):Turn off electric motors and How To Repair Cracked Circuit Boards machinery before cleaning them. Throw the motor switch as well as the main circuit breakers.Clean the electrical equipment using air pressure of 30 psi or less to avoid getting a sandblast effect on delicate parts. 

Vacuum, where possible, and change filter bags often. Avoid damaging surfaces by rubbing or brushing them. Do not blow ash into places that should be kept clean, and How To Repair Cracked Circuit Boards always follow manufacturer's recommendations for cleaning equipment operated under dusty conditions. Increase maintenance servicing as recommended.

Watch for electric shocks when operating ashy and dusty equipment. Be alert to the possibility of overheating and fires.Computer systems Computer heads and discs, and How To Repair Cracked Circuit Boards any high-voltage circuits, are especially vulnerable to ash upset and damage. Ash on digital circuits will not cause much of a problem because of the low voltages involved. 

High-voltage or high-impedance circuits are very vulnerable to leakage caused by semi conductive ash. Ash that is acidic is conductive as well as corrosive. Continual cleaning and How To Repair Cracked Circuit Boards aggressive protection of computer systems should allow for continued operation in all but the heaviest ash fallout (Labadie, J.R., 1994).

Techniques for cleaning include (from Labadie, J.R., 1994): Clean and How To Repair Cracked Circuit Boards condition surrounding air to keep ash out of equipment.Cotton mat filters used in separate clean rooms were found to be best for filtering particles, but they reduce the air flow. A solution is to use larger fans to maintain required air flow. 

Rack-mounted equipment can be modified to add a larger fan, How To Repair Cracked Circuit Boards but smaller instruments or components with a built-in fan would require design change to increase fan capacity. Use fluted filters as a compromise; increases surface area but reduces air flow by only about 20%.Digital integrated circuits can vary 5-10% in performance (depending on type of circuit) and still be acceptable. 

It is difficult to generalize about other equipment (e.g. high-voltage power supplies). Humidifying ambient air (for example, wetting carpets) will help to control ash re-entrainment. Ash on equipment can be blown out with compressed air. If the air is too dry, How To Repair Cracked Circuit Boards static discharge could damage sensitive components (for example, integrated circuits). If the air is too damp, the ash will stick. 

Relative humidity of 25-30% is best for compressed air.Cleaning with a pressurized water-detergent mix and a hot water rinse is quite effective. However, How To Repair Cracked Circuit Boards this process requires at least partial disassembly. Ash should be blown or brushed away from power supplies.Ash may have high static charge and be hard to dislodge, thus equiring brushing to dislodge particles.

Accelerate filter change; use pre-filters.Change to absolute filters; these will keep out particles down to 1 micron and smaller.Keep computer power on to operate filtration, How To Repair Cracked Circuit Boards but don't run (especially disk drives).Maintain "room-within-a-room" configuration; restrict access; re-circulate air; accelerate cleaning of the critical area.

Appliances To reduce ash infiltration and reduce the need for extensive maintenance of equipment, appliances, and machines, How To Repair Cracked Circuit Boards place coverings over the items as standard procedure. Carefully monitor vacuum cleaners to assure that filters and ash bags are changed when necessary. For appliances with electric motors, see electric motors.

Removing Ash ||Inside buildings &households||Disposal||Roofs||Inside buildings and households In general surfaces should be vacuumed to remove as much ash as possible from carpets, furniture, office equipment, appliances, and How To Repair Cracked Circuit Boards other items. Portable vacuum systems equipped with high-efficiency particulate filtering systems are recommended whenever possible. 

The severity of ash intrusion depends on the integrity of windows and entrances, the air intake features, and the care exercised to control the transport of ash into a building or home via shoes and clothing (see recommendations for keeping ash out). Care should also be taken to avoid further contamination during the emptying, cleaning, and How To Repair Cracked Circuit Boards maintenance of vacuum equipment.

Suggested ash removal from buildings and households (FEMA, 1980):Cleaning by blowing with compressed air or dry sweeping should be minimized. A dustless method of cleaning such as Washington with water and How To Repair Cracked Circuit Boards an effective detergent/wetting agent is recommended. Damp rag techniques should be used whenever possible to remove the substance from small surface areas or flooring. 

On those areas where damp rag How To Repair Cracked Circuit Boards techniques cannot be implemented (for example, carpets) vacuum cleaning methods should be applied. After vacuuming carpets and upholstery may be cleaned with a detergent shampoo. Avoid excess rubbing action because the sharp ash particles may cut textile fibers.

Glass, porcelain enamel and acrylic surfaces may be scratched if wiped too vigorously. Use a detergent soaked cloth or sponge How To Repair Cracked Circuit Boards and dab rather than wipe. High-shine wood finishes will be dulled by the fine grit. Vacuum surfaces and then blot with a cloth treated to pick up ash. A tack cloth used by furniture refinishers should work well.

Floor sweepers with side brushes should not be used to clear aisles and floors because they may re-entrain dust particles into the air.Ash-coated fabrics should be rinsed under running water How To Repair Cracked Circuit Boards and then washed carefully.Soiled clothing will require extra detergent. Wash small loads of clothing, using plenty of water so the clothes will have room to move freely in the water. 

Do not mix heavily soiled clothes with garments that are lightly soiled. Be sure clothes are free of ash before putting them in an automatic dryer Ash may scratch the inner surface of the dryer. For several months after an ash fall, How To Repair Cracked Circuit Boards filters may need replacing often. Air conditioner and furnace filters need careful attention. Clean refrigerator air intakes. 

Clean any surface that may blow air and recirculate the ash. Stove fans and How To Repair Cracked Circuit Boards vents should be cleaned thoroughly. Each employee should be responsible for clean-up of his/her own work area to minimize exposure potential during a work shift. This should be accomplished at the beginning of each workshift. Damp rag or vacuum techniques should be used during this operation.

Ash Disposal Ash removed from inside buildings and homes should be disposed in accordance to community plans and directions (for example, How To Repair Cracked Circuit Boards preparing it for pick up by clean-up crews as part of neighborhood cleanup activities). 

It may be advisable to request that people separate volcanic ash from normal garbage for collection or disposal at a designated location, How To Repair Cracked Circuit Boards mixing ash with normal garbage can result in damage to collection vehicles and take up space in landfills. Small amounts of ash from vacuum cleaners have been disposed successively in household gardens and lawns.

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In one set of tests, the vertical plates were placed with a fixed spacing of 2.5 mm. In these tests, the plates were biased with 5 Vdc, 50 Vdc, 500 Vdc and 1 Vac. The current flow between the dc-biased plates was monitored during exposure. The ac-biased plates were analyzed to measure Smoke Damage DIY Removing Smoke Damage From Wood   read more..