8-2.
Removing and installing the LSI and chip
components on the FPC PWB
(When a defective component
is known without separating
the FPC PWB from the key PWB)
(1) Removing the LSI
a. Connect the LSI soldering tip to the soldering pencil
(see figure), set the surface temperature
of the tool to
260
o
±5°C,
and secure it on the vise installed on the
workbench.
~
'-
Tip of the soldering
pencil
Soldering
pencil
If it is heated above the given temperature,
it
might
separate
the circuit
pattern
or the
FPC PWB itself.
The soldering pencil is held up to prevent solder, flux,
and gas from invading the back of the key PWB, where
the key contact
pattern,
the LCD rubber connector,
is
mounted.
b. Evenly apply a proper amount of flux over the leads of
the LSI, and fill up the back side of the chip with solder.
-
PC-1600
c. Lift the PWB with your hand and carefully
mount
it
over the leads of the LSr. When the solder on the leads
melts after five to six seconds, remove the LSI from the
PWB using a tweezers
(or a small flat tip screwdriver).
d. Clean away sold er fragments
remaining on the pattern
side of the LSI using a solder wick. Then, evenly apply a
thin layer of solder over the surface.
e. Apply a small amount of solder to the leads of the new
LSI, and solder the leads with care. Press the mold of
the LSI with your finger tip while soldering the leads.
(2) How to remove and install the chip component
a. Melt both
sides of the
chip
component
using two
soldering pencils at the same time. Remove the
corn-
ponent quicklv ,
b. After the removal of the chip component,
clean the
pattern with a solder wick.
c. Solder one side of the new chip
cornponent.
Let it
cool for ten seconds; then solder the other side.
Summary of Contents for PC-1600
Page 42: ... 11 CIRCUIT DIAGRAM PARTS POSITION KEY P W B LCD SIDE 39 ...
Page 43: ...PC l600 40 ...
Page 44: ...PC 1000 KEY P W B LSI SIDE 41 ...
Page 45: ... 42 ...
Page 48: ... PC l600 F P C P W B 45 ...
Page 49: ... Kn 46 ...
Page 52: ... PC l600 CONNECTOR P W B 49 ...
Page 53: ... 50 ...
Page 55: ... __ PC l600 tli I ONLY Pc 1600K I I 1 I 52 l J ...
Page 56: ... PC l600 K MEMORY P W B ROM Cut c IJ O lJ1F C O lJ1F I Bend capacitor to inward ROM SIDE 53 ...
Page 57: ...RAM SIDE 54 ...
Page 61: ...I I 2 3 4 42 58 ...
Page 93: ... P W B LSI SIDE t 90 ...
Page 117: ... PC I600 ...