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Disassembly and Cleaning
60
5.2 Handling of P.W.Boards
5.2.1 Precautions regarding transportation and storage
1. During shipment or when in storage, new P.W.Board must not be
indiscriminately removed from their protective bags.
2. Do not store or place these P.W.Boards in a location exposed to direct
sunlight or in a location where they will be exposed to high
temperatures.
3. After removal from a machine, P.W.Board must be placed in their
respective conductive bag or wrapped in aluminum foil without fail.
Never wrap them in plastic, paper or any other material.
4. When removal from the conductive bag or case becomes absolutely
necessary, always place the Board removed on its conductive mat in
an area as free as possible from static electricity.
5. Do not touch the terminals of the ICs with your bare hands.
5.2.2 Precautions when replacing PWBs
1. Any Board should be replaced as an Assy.
2. When taking any Board out of its conductive bag or conductive case,
do not touch the terminals of the ICs or the printed pattern. Place it in
position by holding only the edge of the Board.
3. Connect the connectors to or disconnect them from any Board only
after having unplugged the Main Power Cord of the machine.
5.2.3 Precautions when checking PWBs
1. Avoid checking PWBs with testers; instead, use operating parts of the
machine, indicator lamps, and other means to evaluate operational
conditions.
2. Never permit shorts between IC terminals due to metal fittings, etc.
3. If it is necessary to touch elements on the PWB with your hand, make
sure your body is properly grounded.