Emerson 6420FE Standard Notes for Servicing, Circuit Board Indications, Pb Lead Free Solder

Circuit Board Indications

a.The output pin of the 3 pin Regulator ICs is indicat- ed as shown.

b.For other ICs, pin 1 and every fifth pin are indicat- ed as shown.

5

Pin 1

10

c.The 1st pin of every male connector is indicated as shown.

Pin 1

Pb (Lead) Free Solder

Pb free mark will be found on PCBs used Pb free solder. (Refer to figure.) For PCBs with Pb free mark, be sure to use Pb free solder. For PCBs without Pb free mark, use standard solder.

Pb free mark

How to Remove / Install Flat Pack-IC

1. Removal

With Hot-Air Flat Pack-IC Desoldering Machine:

(1)Prepare the hot-air flat pack-IC desoldering ma- chine, then apply hot air to the Flat Pack-IC (about 5 to 6 seconds). (Fig. S-1-1)

Fig. S-1-1

(2)Remove the flat pack-IC with tweezers while ap- plying the hot air.

(3)Bottom of the flat pack-IC is fixed with glue to the CBA; when removing entire flat pack-IC, first apply soldering iron to center of the flat pack-IC and heat up. Then remove (glue will be melted). (Fig. S-1-6)

(4)Release the flat pack-IC from the CBA using twee- zers. (Fig. S-1-6)

Caution:

1.The Flat Pack-IC shape may differ by models. Use an appropriate hot-air flat pack-IC desoldering ma- chine, whose shape matches that of the Flat Pack- IC.

2.Do not supply hot air to the chip parts around the flat pack-IC for over 6 seconds because damage to the chip parts may occur. Put masking tape around the flat pack-IC to protect other parts from damage. (Fig. S-1-2)