Sharp DV-SL700W Service Manual page 7

(4) Bottom of the flat pack-IC is fixed with glue to the
Instructions for Handling
CBA; when removing entire flat pack-IC, first apply
Semi-conductors
soldering iron to center of the flat pack-IC and heat
up. Then remove (glue will be melted). (Fig. S-1-6)
Electrostatic breakdown of the semi-conductors may
(5) Release the flat pack-IC from the CBA using twee-
occur due to a potential difference caused by electrostatic
zers. (Fig. S-1-6)
charge during unpacking or repair work.
Note:
1. Ground for Human Body
When using a soldering iron, care must be taken to
ensure that the flat pack-IC is not being held by glue.
Be sure to wear a grounding band (1MΩ) that is properly
When the flat pack-IC is removed from the CBA,
grounded to remove any static electricity that may be
handle it gently because it may be damaged if force
charged on the body.
is applied.
2. Ground for Workbench
Be sure to place a conductive sheet or copper plate with
proper grounding (1MΩ) on the workbench or other
surface, where the semi-conductors are to be placed.
Because the static electricity charge on clothing will not
escape through the body grounding band, be careful to
avoid contacting semi-conductors with your clothing.
< Incorrect >
To Solid
Mounting Point
CBA
< Correct >
Tweezers
Hot Air Blower
Iron Wire
Soldering Iron
Fig. S-1-5
CBA
Fine Tip
Soldeing Iron
Grounding Band
Flat Pack-IC
Fig. S-1-6
CBA
Conductive Sheet or
Copper Plate
2. Installation
(1) Using desoldering braid, remove the solder from the
foil of each pin of the flat pack-IC on the CBA so you
can install a replacement flat pack-IC more easily.
(2) The "●" mark on the flat pack-IC indicates pin 1. (See
Fig. S-1-7.) Be sure this mark matches the 1 on the
PCB when positioning for installation. Then presol-
der the four corners of the flat pack-IC. (See Fig. S-
1-8.)
(3) Solder all pins of the flat pack-IC. Be sure that none
of the pins have solder bridges.
Example :
or
Pin 1 of the Flat Pack-IC
is indicated by a "
CBA
7
DV-SL700W
" mark.
Fig. S-1-7
Presolder
Flat Pack-IC
Fig. S-1-8