Samsung Electronics
5-7
5-3 PCB Inspection
5-3-1 Cautions for Part Replacement
5-3-2 Procedure
The parts should be replaced in the following pro c e d u re .
1 . The human body carries much static
e l e c t r i c i t y. Before touching a part for re p a i r,
replacement or the similar purpose, be sure
to touch a grounded metallic portion by
hand to let the static electricity go thro u g h
the matallic portion to the earth.
Espectially when handling any micro
computer or IC, carefully remove such static
electricity before touching them.
2 . When repairing any part on a work bench,
be sure to place an insulative sheet on the
bench and always keep the sheet surface
neat without any metal fragments. If any
such fragment touches a part, a secondary
t rouble will possibly be caused in the part.
3. B e f o re replacing any parts, be sure to turn
o ff the power supply. If such replacement is
done with the power supply kept on, an
electric shock, short circuit or destruction of
a part may re s u l t .
4. During replacement or repair of a part,
c a refully handle it : The printed circ u i t
b o a rd has fine lead wires (jumper wires) and
glass-made parts (diode) on its substrate.
So if a circuit board is roughly handled, such
lead wires and parts will be easily broken or
damaged by bending or shock.
5 . When soldering the lead wires of any new
part, be sure to polish them using an emery
paper or the like before solding them.
Since the lead wires of any new part are
c o v e red with an oxide film, solder cannot
a d h e re to the lead wires if not polished.
6 . When soldering any part, care should be
e x e rcised not to apply any high-wattage
soldering iron to the part for a long time.
Some parts are of so low a heat re s i s t a n c e
that they may be broken or have the
p roperties changed if a soldering iron is so
applied (Otherwise, the pattern may
possibly be separated and raised).
7. The heat of the soldering iron should be
t r a n s f e red to the entire object to be soldere d .
If the solder pieces are not well fused due to
i n s u fficient transfer of the heat from the
soldering iron, no satisfactory electrical
continuity can be assured even if the
s o l d e red objects appear well connected to
each other.
8 . The solder used should be limited to a
minimum. If excessive solder is used, it will
cause inter-pattern contact, which may
cause malfunction of the circ u i t .
The repair is completed.
Check the operation of the new part.
Replace it with a new part.
Detach the faulty part.
Check for any faulty part.
Summary of Contents for US07A1VE
Page 2: ... Samsung Electronics Co Ltd FEB 1997 Printed in Korea Code No DB81 10122A 1 ...
Page 4: ...1 2 Samsung Electronics MEMO ...
Page 27: ...Samsung Electronics 3 14 MEMO ...
Page 42: ...Samsung Electronics 6 1 6 Exploded Views and Parts List 6 1 Indoor Unit ...
Page 44: ...Samsung Electronics 6 3 6 2 Outdoor Unit 24 1 24 25 25 2 25 1 25 3 25 4 25 5 18 18 1 19 ...
Page 48: ...6 7 Samsung Electronics MEMO ...
Page 50: ...Samsung Electronics 8 1 8 PCB Diagrams 8 1 a Main PCB 7000Btu DB93 10483A ...
Page 52: ...Samsung Electronics 8 3 8 1 b Main PCB 9000 12000Btu 12000BUT DB93 10471A 9000BUT DB93 10485A ...
Page 55: ...Samsung Electronics 9 1 9 Wiring Diagrams 9 1 Indoor Unit ...
Page 57: ...Samsung Electronics MEMO ...
Page 58: ...Samsung Electronics MEMO ...
Page 59: ...10 1 10 Schematic Diagrams 10 1 Indoor Unit Samsung Electronics ...
Page 60: ...Samsung Electronics 10 2 10 2 Remote Control ...