Replacing The Cpu Board Assembly; Replacing The Process Connector Gasket - YOKOGAWA DPharp EJXC80A User Manual

6.4.2 Replacing the CPU Board Assembly
This subsection describes the procedure for
replacing the CPU assembly. (See figure 6.3)
■ Removing the CPU Assembly
1) Remove the cover. If an integral indicator is
mounted, refer to subsection 6.4.1 and remove
the indicator.
2) Turn the zero-adjustment screw to the position
(where the screw head slot is horizontal) as
shown in figure 6.3.
3) Disconnect the output terminal cable (cable
with brown connector at the end). When doing
this, lightly press the side of the CPU assembly
connector 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
connector 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
assembly. 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
subsection 6.4.1 to mount the indicator.
<6. Maintenance>
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.
6.5 Replacing the Process
Connector Gasket
This section describes the procedure for replacing
the process connector gasket. (See Figure 6.4)
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.
Process connector gasket
Process connector
Bolt
Figure 6.4 Replacing the Process Connector
Gasket
6-5
F0609.ai
IM 01C25W01-01EN