Yokogawa EJX210B - Manual (Page 66)

<9. Maintenance>
9-4
IM 01C27C01-01EN
Zero
adjustment
screw
RF assembly
CPU assembly
Amplifer cover
Mounting screw
Integral indicator
Boss
Stud
F0902.ai
Press
Forward
Power
cable
Zero-adjustment
screw pin
Figure 9.2 Removing and Attaching Integral
indicator, RF assembly and CPU
Assembly
9.4.2 Replacing the RF Assembly
This subsection describes how to replace the RF
assembly (see Figure 9.2).
■ Removing the RF assembly
1) Remove the cover.
2) Remove the integral indicator (refer to
subsection 9.4.1).
3) Remove the two stud bolts by using a socket
driver (width across flats: 5.5 mm).
4) Disconnect the RF assembly from the CPU
assembly. When doing this, carefully pull the RF
assembly straight forward so as not to damage
the connector pins between it and the CPU
assembly.
5) Disconnect the antenna cable that connects the
RF assembly and the antenna.
NOTE
Be careful not to apply excessive force to the
RF assembly and the connector of the antenna
cable when removing it.
■ Mounting the RF assembly
1) Connect the antenna cable between the RF
assembly and the antenna.
2) Align both the RF assembly and CPU assembly
connectors and engage them.
3) Tighten the two stud bolts.
4) Mount the integral indicator (refer to subsection
9.4.1).
5) Replace the cover.
9.4.3 Replacing the CPU Assembly
This subsection describes how to replace the CPU
assembly (see Figure 9.2).
■ Removing the CPU assembly
1) Remove the cover.
Remove the integral indicator and the RF
assembly (refer to subsections 9.4.1 and 9.4.2).
2) Turn the zero-adjustment screw to the position
as shown in Figure 9.2.
3) Disconnect the power 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 (see the upper left of
Figure 9.2).
4) Use a socket driver (width across flats, 5.5 mm)
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 power cable (with brown
connector) to the CPU assembly.
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
assembly. Then insert the CPU assembly
straight onto the post in the amplifier case.
4) Tighten the two bosses. Mount the RF
assembly, and the integral indicator (refer to
subsections 9.4.1 and 9.4.2).