Panasonic BB-HCM547A Service Manual

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Panasonic BB-HCM547A Service Manual Manual pdf 48 page image

48BB-HCM547A7.21. How to Replace a Flat Package IC7.21.1. Preparation• PbF (: Pb free) Solder• Soldering IronTip Temperature of 700°F ± 20°F (370°C ± 10°C)Note: We recommend a 30 to 40 Watt soldering iron. Anexpert may be able to use a 60 to 80 Watt iron where some-one with less experience could overheat and damage thePCB foil.• FluxRecommended Flux: Specific Gravity → 0.82.Type → RMA (lower residue, non-cleaning type)Note: See About Lead Free Solder (PbF: Pb free) (P.3).7.21.2. Procedure1. Tack the flat pack IC to the PCB by temporarily solderingtwo diagonally opposite pins in the correct positions onthe PCB.Be certain each pin is located over the correct pad on the PCB.2. Apply flux to all of the pins on the IC.3. Being careful to not unsolder the tack points, slide the sol-dering iron along the tips of the pins while feeding enoughsolder to the tip so that it flows under the pins as they areheated.7.21.3. Removing Solder from BetweenPins1. Add a small amount of solder to the bridged pins.2. With a hot iron, use a sweeping motion along the flat partof the pin to draw the solder from between the adjacentpads.