Philips p29 free download

File name p29.pdf

Repair Tips 109B2 GS3 CM25 29 26 9 Go to cover page 0. Warning 1.4 Attachment of SMDs - Locate the SMD on the solder lands by means of tweezers and All ICs and many other semi-conductors are susceptible to solder the component on one side. Ensure that the component is electrostatic discharges (ESD). Careless handling during repair can Positioned correctly on the solder lands (see Fig.2A). reduce life drastically. When repairing, make sure that you are - Next complete the soldering of the terminals of the component (see connected with the same potential as the mass of the unit via a wrist Fig. 2B). wrap with resistance. Keep components and tools also at the same potential ! Fig. 2 MOUNTING e.g. A PAIR OF TWEEZERS 1. Servicing of SMDs (Surface Mounted Devices) 1.1 General cautions on handling and storage A - Oxidation on the terminals of SMDs results in poor soldering. Do not handle SMDs with bare hands. SOLDER 0.5 - 0.8 mm - Avoid using storage places that are sensitive to oxidation such as PRESURE places with sulphur or chlorine gas, direct sunlight, high SOLDERING IRON temperatures or a high degree of humidity. The capacitance or resistance value of the SMDs may be affected by this. - Rough handling of circuit boards containing SMDs may cause damage to the components as well as the circuit boards. Circuit SOLDERING TIME SOLDER B < 3 sec/side 0.5 - 0.8 mm boards containing SMDs should never be bent or flexed. Different PRESURE circuit board materials expand and contract at different rates when