IM 01C25C01-01E
8-4
8. MAINTENANCE
8.4.2 Replacing the CPU Board Assembly
This subsection describes the procedure for replacing
the CPU assembly. (See Figure 8.3)
Removing the CPU Assembly
1) Remove the cover. If an integral indicator is
mounted, refer to Subsection 8.4.1 and remove the
indicator.
2) Turn the zero-adjustment screw to the position
(where the screw head slot is horizontal) as shown
in Figure 8.3.
3) Disconnect the output terminal cable (cable with
brown connector at the end). When doing this,
lightly press the side of the CPU assembly connec-
tor and pull the cable connector 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).
NOTE
Make certain that the cables are free of pinching
between the case and the CPU assembly edge.
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 8.4.1 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.
8.4.3 Replacing the Process Connector
Gasket
This subsection describes the procedure for replacing
the process connector gasket. (See Figure 8.4)
1) Loosen the two bolts and remove the process
connector.
2) Replace the process connector gasket.
3) Mount the process connector. Tighten the bolts
securely and uniformly to a torque of 39 to 49 N·m
{4 to 5 kgf·m}, and verify that there are no pressure
leaks.
F0804.EPS
Process connector gasket
Process connector
Bolt
Figure 8.4
Replacing the Process Connector Gasket
