Yokogawa Wireless Temperature Transmitter YTA510 - Manual (Page 55)

<8. Maintenance>
8-4
IM 01C50E01-01EN
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) Disconnect the power cable. 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).
3) Use a socket driver (width across flats, 5.5 mm)
to loosen the two bosses.
4) Carefully pull the CPU assembly straight
forward to remove it.
5) Disconnect the flat cable (cable with white
connector at the end) that connects the CPU
assembly and the printed circuit assembly
(fixed) in bottom of the amplifier case.
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 printed
circuit assembly (fixed) in bottom of the
amplifier case.
2) Connect the power cable to the CPU assembly.
NOTE
Insert the cable in the connector firmly.
Make certain that the cables do not get pinched
between the case and the edge of the CPU
assembly.
3) 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).
5) Replace the cover.
8.4.4 Replacing the Battery Pack
Regarding the transmitter with intrinsically safe
approval, the battery pack can be replaced without
removing the device in hazardous area.
■ Removing
1) Remove the terminal box cover.
2) Loosen the two battery pack mounting screws
(see Figure 8.3).
3) Pull the battery pack.
F0803.ai
The screw has the dropout
prevention mechanism,it is not
separated from the battery pack
Figure 8.3 Removing the Battery Pack
■ Remounting
1) Insert the new battery pack lightly.
2) Push the center of the battery pack and insert it
securely.
3) Tighten the two battery pack mounting screws
to a torque of approximately 0.7 N•m.
4) Replace the terminal box cover.