1-3 PCB check
1-3-1 points for attention while replace parts
1.Make sure that human body is grounded as a safety way or not before execute reparation and parts replacement due to human body carrying electrostatic,
especially before contact some micro-computer or integrated circuit, confirm to discharge electrostatic completely (make sure whether wear an effective
grounding ring in the wrist or not)
2.While execute a live reparation of parts on work bench, make sure that a insulating cushion must be provided and no metallurgic fragments on cushion.
If any metallurgic fragments contact with parts, possibly, damage other section of parts.
3.Power supply must be cut off before replace components, if perform a live operation, possibly, results in electric shock, short and other damage.
4.During parts replacement or reparation , make sure that: conduct wire on circuit panel (whether there is jumper loop or not); diode location.
Conduct wire and member are damaged resulting from easy to bend and shock due to coarse treatment for circuit panel.
5.Clean the conduct wire and new member by sand paper and etc before welding, otherwise the welding material will be possibly adhered to conduct wire
and parts due to oxidation.
6.Avoid using electric iron with high-efficiency to weld for a long time while welding, otherwise the members with low heat resistance are easy to be damaged.
7.The quantity of heat of electric iron should be spreaded all over the object welded, otherwise welding will not be performed very well.
8.Welding material should be as little as possible while welding, too much welding material possibly causes circuit failure.
1-3-2 Process
Replace member subject to the flow as followed:
Check the member with failure
Dismantle the component with failure
Check capacity of new member
Maintenance finish
Replace failure component
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