41CL User Manual
© 2019, Systemyde International Corporation
17
15.
Carefully fit the center case section (with the proper orientation) and bottom case
back together with the remainder of the calculator body. If you installed the serial
connector be very careful not to pinch the serial cable between the case halves.
16.
Re-install the four screws. The proper way to do this is to slowly turn the screw
ba
c
kwa
r
ds
unt
i
l
you f
e
e
l
t
he
s
c
r
e
w t
hr
e
a
ds
“
c
l
i
c
k”
i
nt
o t
he
t
hr
e
a
ds
i
n t
he
pos
t
.
Carefully tighten the screws.
Do not over-tighten the screws
as you risk cracking or
shearing off the screw posts. It is best to hold the case sections tightly together with
one hand while tightening the screws with the other hand, as this reduces the stress
the screws place on the screw posts and case pieces.
17.
Re-install the battery case (with the new batteries) and turn the calculator on. If there
is no response the flexible connectors are not completely connecting the 41CL circuit
board to the main circuit board, and you will need to either tighten the screws a little
or reform the circular connector slightly. If garbage rather than the
MEMORY
LOST
message appears, try removing the battery pack for 30 seconds and re-
inserting it again. The display controller contains its own power-on-reset circuit,
which sometimes does not properly synchronize with the CPU, leading to garbage in
the display on power-up. This occasionally occurs even in the original design. If this
doe
s
n’
t
wor
k
t
r
y
XEQ ALPHA
TURBOX
ALPHA
, which guarantees operation at
normal speed, even though the Turbo mode is supposed to be disabled at first power-
on.
18.
Once the 41CL circuit board installation is verified working, reinstall the calculator
feet, and proceed to the initial configuration of the software.
