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17
Fig
4 - 2
Screw(c)
Screw(el
Under 850µA
Under
12µA
• Measuring
current
consump tion
Power source voltage. 4.72V
Current
consumption:
After depress the ON key:
After depress the OFF
key:
Fig 4-
1
Lach
•
Disass
embly
procedure
1)
Remove the 2 screws
(a)
and
2 screws (b
).
2) Separate the upper
cabinet
from the lower cabinet from
the screw
side, as they
are
latched
together at
three
points,
A,
B,
and
C.
• Repairing procedure
1) As the back
of
the
arithmetic
printed board comes into
sight after the removal of the
lower cabinet, the arithmetic
printed board can be checked from the back
side.
2) Replacement
of
the CPU II is
possible.
3) If the key
printed
board is to be
checked,
the arithmetic printed board has to be bent
in
right
angle
after removing
the screws ( d) and ( e ). Inspection of the CPU I is possible if the buzzer is
removed after
removing
the screw
(c).
4) The key printed board can be dismounted from the upper cabinet when the 9 screws (f) and
2 screws
(g)
are
removed. But,
care must
be
exercised in dismounting the printed
board,
as
key tops may
come
falling down one after
another.
• Replacement of the LSI
1)
It
will be much convenient if the LSI use soldering pencil (UKOG-0078CSZZ) is
used
for
replacing the LSI.
2) Be sure to remove the
key
printed board from the upper cabinet
first, if
the LSI on the key
printed board
is to
be removed. If the LSI was removed with the key printed
board
being
fitted on the
upper cabinet,
there is a
possibility
of deforming the key rubber by
the
heat of
the
soldering
pencil.
3) Be sure
to
cut the legs
of IC,
if IC was removed.
~--Screw
(b)
4. ABOUT SERVICING
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