Yokogawa Wireless Temperature Transmitter YTA510 - Manual (Page 54)

<8. Maintenance>
8-3
IM 01C50E01-01EN
RF assembly
CPU assembly
Amplifier Cover
Mounting screw
Integral
Indicator
Boss
Stud
F0802.ai
Press forward
Output terminal
cable
Figure 8.2 Removing and Attaching integral
Indicator and CPU Assembly
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
CPU 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.
Table 8.2 Tools for Disassembly and Reassembly
Tool Quantity Remarks
Phillips
screwdriver
1 JIS B4633, No. 2
Slotted
screwdriver
1
Allen wrenches 3 JIS B4648
One each, nominal 3,
4 and 2.5 mm Allen
wrenches
Wrench 1 Width across flats, 17 mm
Torque wrench 1
Adjustable
wrench
1
Socket wrench 1 Width across flats, 16 mm
Socket driver 1 Width across flats, 5.5 mm
Tweezers 1
8.4.1 Replacing the Integral Indicator
This subsection describes the procedure for
replacing an integral indicator. (See figure 8.2)
■ Removing the Integral Indicator
1) Remove the cover.
2) While supporting the integral indicator with one
hand, loosen its two mounting screws.
3) Dismount the LCD board assembly from the RF
assembly.
When doing this, carefully pull the LCD board
assembly straight forward so as not to damage
the connector pins between it and the RF
assembly.
■ Attaching the Integral Indicator
1) Align both the LCD board assembly and RF
assembly connectors and engage them.
2) Insert and tighten the two mounting screws.
3) Replace the cover.