2 replacing the rf assembly, 3 replacing the cpu assembly, Replacing the rf assembly -4 – Yokogawa EJX438B User Manual

Page 65: Replacing the cpu assembly -4, Important

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<8. Maintenance>

8-4

IM 01C27H01-01EN

8.4.2 Replacing the RF Assembly

This subsection describes how to replace the RF

assembly (see Figure 8.2).

■ Removing the RF assembly
1) Remove the cover.

2) Remove the integral indicator (refer to

subsection 8.4.1).

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

8.4.1).

5) Replace the cover.

8.4.3 Replacing the CPU Assembly

This subsection describes how to replace the CPU

assembly (see Figure 8.2).

■ Removing the CPU assembly
1) Remove the cover.

Remove the integral indicator and the RF

assembly (refer to subsections 8.4.1 and 8.4.2).

2) Turn the zero-adjustment screw to the position

as shown in Figure 8.2.

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 8.2).

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 8.4.1 and 8.4.2).

IMPORTANT

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.

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