Read Sharp DX-AT50H (serv.man21) Service Manual online
– 9 –
DX-AT50H
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.
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 presolder the four corners
of the flat pack-IC. (See Fig. S-1-8.)
positioning for installation. Then presolder 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 :
Pin 1 of the Flat Pack-IC
is indicated by a "
is indicated by a "
" mark.
Fig. S-1-7
Presolder
CBA
Flat Pack-IC
Fig. S-1-8
Instructions for Handling Semi-conductors
Electrostatic breakdown of the semi-conductors may occur
due to a potential difference caused by electrostatic charge
during unpacking or repair work.
due to a potential difference caused by electrostatic charge
during unpacking or repair work.
1. Ground for Human Body
Be sure to wear a grounding band (1 Mohm) that is properly
grounded to remove any static electricity that may be charged
on the body.
grounded to remove any static electricity that may be charged
on the body.
2. Ground for Workbench
Be sure to place a conductive sheet or copper plate with proper
grounding (1 Mohm) 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.
grounding (1 Mohm) 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.
CBA
< Incorrect >
CBA
Grounding Band
Conductive Sheet or
Copper Plate
Copper Plate
< Correct >
1Mohm
1Mohm
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