IM 01C25R01-01E
9-5
9. MAINTENANCE
F0904E.EPS
Press
forward
Output terminal cable
Zero-adjustment
screw pin
Slide
switch
Boss
Zero-
adjustment
screw
Integral
indicator
Mounting screw
Amplifier Cover
CPU assembly
Bracket
(for zero-adjustment
screw pin)
LCD board assembly
Figure 9.4 Removing and Attaching LCD Board Assembly
and CPU Assembly
9.4.2 Replacing the CPU Board Assembly
This subsection describes the procedure for replacing
the CPU assembly. (See figure 9.4)
Removing the CPU Assembly
1) Remove the cover. If an integral indicator is
mounted, refer to subsection 9.4 and remove the
indicator.
2) Turn the zero-adjustment screw to the position
(where the screw head slot is horizontal) as shown
in figure 9.4.
3) Disconnect the output terminal cable (cable with
brown connector at the end) and RTD input
terminal cable (cable with blue connector at the
end). When doing this, lightly press the side of the
CPU assembly connector and pull the cable connec-
tor to disengage.
4) Use a socket driver (width across flats, 5.5mm) to
loosen the two bosses.
5) Carefully pull the CPU assembly straight forward to
remove it.
6) Disconnect the flat cable (cable with white connec-
tor at the end) that connects the CPU assembly and
the capsule.
NOTE
Be careful not to apply excessive force to the
CPU assembly when removing it.
Mounting the CPU Assembly
1) Connect the flat cable (with white connector)
between the CPU assembly and the capsule.
2) Connect the output terminal cable (with brown
connector) and RTD input terminal cable (with blue
connector).
NOTE
Make certain that the cables do not get pinched
between the case and the edge of the CPU
assembly.
3) Align and engage the zero-adjustment screw pin
with the groove on the bracket on the CPU assem-
bly. Then insert the CPU board assembly straight
onto the post in the amplifier case.
4) Tighten the two bosses. If the transmitter is
equipped with an integral indicator, refer to subsec-
tion 9.4.1 to mount the indicator.
NOTE
Confirm that the zero-adjustment screw pin is
placed properly in the groove on the bracket
prior to tightening the two bosses. If it is not, the
zero-adjustment mechanism will be damaged.
5) Replace the cover.
9.4.3 Cleaning and Replacing the Capsule
Assembly
This subsection describes the procedures for cleaning
and replacing the capsule assembly. (See figure 9.5.)
