Yokogawa EJA220A - Manual (Page 54)

IM 01C21C01-01E 9-4
9. MAINTENANCE
᭿ Attaching the Integral Indicator
Integral indicator can be installed in the following three
directions.
F0910.EPS
Figure 9.4.1 Installation Direction of Indicator
1) Align both the LCD board assembly and CPU
assembly connectors and engage them.
2) Insert and tighten the two mounting screws.
3) Replace the cover.
F0903.EPS
Press
forward
Output terminal cable
LCD board
assembly
Integral
indicator
Cover
Boss
CPU assembly
Flat cable
Bracket
(for zero-adjustment
screw pin)
Mounting
screw
Zero-adjustment
screw pin
Figure 9.4.2 Removing and Attaching LCD Board Assem-
bly and CPU Assembly
9.4.2 Replacing the CPU Board Assembly
This subsection describes the procedure for replacing
the CPU assembly. (See Figure 9.4.2)
᭿ Removing the CPU Assembly
1) Remove the cover. If an integral indicator is
mounted, refer to Subsection 9.4.1 and remove the
indicator.
2) Turn the zero-adjustment screw to the position
(where the screw head slot is horizontal) as shown
in Figure 9.4.2.
3) Disconnect the output terminal cable (cable with
brown connector at the end). When doing this,
lightly press the side of the CPU assembly connec-
tor 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 black connec-
tor 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 black 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 assem-
bly. 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 Subsec-
tion 9.4.1 to mount the indicator.