Yokogawa digitalYEWFLO (DY) - Manual (Page 80)

MAINTENANCE
IM 1F2B4-01-YIA
Page 75
4.2 D
ISASSEMBLY AND REASSEMBLY
This section describes disassembly and reassembly procedures required for maintenance and parts
replacement. For replacement parts, see the parts list at the end of this manual.
Before disassembling the transmitter, turn the power off and release the pressure. Be sure to use the
proper tools for disassembling and reassembling.
Caution: It is prohibited by law for the user to modify flameproof instruments. This includes adding or
removing indicators. If modification is required, contact Yokogawa Industrial Automation.
4.2.1 Indicator/Totalizer removal
When servicing the amplifier, follow procedures below.
1)
Turn the power off.
2) Remove the cover.
3) Completely loosen the four indicator mounting screws using a Phillips head screwdriver.
4) Disconnect the cable connector from the amplifier unit .
5) Pull out the indicator.
6) To reinstall the indicator, follow these steps in reverse order (step 5 to step 1).
7) The ribbon cable key located on top of the connector should face upward when installed.
Figure 4.2.1: Removing and reinstalling the indicator
4.2.2 Amplifier replacement
Replace the amplifier as follows:
1)
Turn the power off.
2) Remove the converter cover.
3) If required, remove the indicator as described in section 4.2.1.
4) Slightly loosen the three (3) terminal screws and remove the leadwires from the P, + and -
terminals. Don't drop the screws.