NOTE: These components
are affixed
with glue. Be careful not to break or damage
any foil under the
component
or at the pins of the ICs when removing.
Usually applying
heat to the component
for a short
time while twisting
with tweezers will break the component
loose.
Leadless Chip Components
(surface mount)
Chip components
must be replaced with identical chips due
to critical foil track spacing. There are no holes in the board
to mount standard
transistors
or diodes. Some chip capaci-
tor or resistor board solder pads may have holes through the
board,
however
the hole diameter
limits standard
resistor
replacement
to l/8 watt. Standard
capacitors
may also be
limited for the same reason. It is recommended
that identical
chip components
be used..
Chip resistors have a three digit numerical
resistance
code -
1st and 2nd significant
digits and a multiplier. Example:
162
= 1600 or 1.6K resistor, 0 = 0 (jumper).
Chip capacitors
generally
do not have the value indicated on
the capacitor. The color of the component
indicates the gen-
eral range of the capacitance.
Chip transistors
are identified
by a two letter code. The first
letter indicates
the type and the second letter, the grade of
transistor.
Chip diodes have a two letter identification
code as per the
code chart and are a dual diode pack with either
common anode or common cathode. Check the parts list for
correct diode number.
Component
Removal
1.
Use solder wick to remove solder from component
end
caps or terminals.
2.
Without
pulling up, carefully
twist the component
with
tweezers
to break the adhesive.
3.
Do not reuse
removed
leadless
or chip components
since they are subject to stress fracture during removal.
Chip Component
Installation
1.
Put a small amount
of solder on the board
soldering
pads.
2.
Hold the chip component
against
the soldering
pads
with tweezers or with a miniature alligator clip and apply
heat to the pad area with a 30 watt iron until solder
flows. Do not apply heat for more than 3 seconds
Chip Components
TypEjjfs&;;;;
QyyR
IST DIGIT
2ND DIGIT
ANo@N
cATH;;;ER
cfg@
l"zY."K
MH DIODE
RESISTOR
How to Replace Flat-IC
-Required
Tools-
* Soldering
iron
l
iron wire or small awl
l
De-solder
braids
l
Magnifier
1.
Remove the solder from all of the pins of a Flat-IC by
using a de-solder
braid.
Flat-E
De-Solder
Braid
Soldering
Iron
2.
Put the iron wire under the pins of the Flat-IC and pull it
in the direction
indicated
while heating the pins using a
soldering
iron. A small awl can be used instead of the
iron wire.
.
Iron
Wire
Awl
3.
Remove the solder
from all of the pads of the Flat-
IC by using
a de-solder
braid.
Soldering
00
00
v
Iron
De-Solder
Braid
h')
Flat-K
--I(-
4.
Position the new Flat-IC in place (apply the pins of the
Flat-IC to the soldering
pads where the pins need to be
soldered).
Properly
determine
the
positions
of the soldering
pads
Polarity Symbol
and pins by correctly aligning
the
polarity symbol.
5.
Solder all pins to the soldering
pads using a fine tipped
soldering
iron.
6. Check with a magnifier
for solder bridge between the pins
or for dry joint between
pins and soldering
pads. To remove
a solder bridge, use a de-solder
braid as shown in the figure
below.
Bridge
Solder
7
Need help?
Do you have a question about the 36SDX88B and is the answer not in the manual?