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6. Daily Maintenance and Periodic Inspection and Maintenance
6.1 Maintenance Tools
(1) Measuring instruments
The following measuring instruments are used to confirm that the voltage is being supplied correctly
to the NC unit, to confirm that the wiring to the NC unit is correct, and to carry out simple
troubleshooting.
Tool
Tester
The tolerable error is ±2%
AC voltmeter
or less.
The tolerable error is ±2%
DC voltmeter
or less.
Synchroscope
(Note 1) Currently, a high-accuracy digital multi-meter is commonly used as a tester. This digital
multi-meter can be used as both an AC voltmeter and an DC voltmeter.
(2) Tools
Screwdriver (large, medium, small)
Radio pliers
6.2 Maintenance Items
Maintenance is categorized into daily maintenance items (items to be carried at set intervals) and
periodic maintenance items (replacement of parts when life is reached).
Some parts will not function in a hardware manner when the life is reached, so these should be
replaced before the life is reached.
Class
Daily
Escutcheon
maintenance
Keyboard cleaning
Periodic
Battery
maintenance
(lithium battery)
CRT (when using
FCU6-DUE71 display
unit)
CRT (when using
FCU6-DUT11 display
unit)
LCD (when using
FCU6-DUN24 display
unit)
6. Daily Maintenance and Periodic Inspection and Maintenance
Condition
Name
Cumulative data
holding time
50,000 hr
7,000 hr
20,000 hr
40,000 hr
6.1 Maintenance Tools
To check that the wiring to the NC unit is correct
before turning the power ON.
To measures the AC power voltage being
supplied to the external 24VDC power supply
unit.
To measure the DC power voltage.
Voltage supply to connector DCIN (control unit,
base I/O unit)
Battery voltage
General measurement and simple
troubleshooting
Life
Inspection/replacement
Once/two months
(Accordingly when dirty)
When battery voltage
drop caution alarm occurs
(Guideline: approx. 5
years)
Replace when CRT
darkens.
Replace when CRT
darkens.
Replace when LCD
darkens.
III-35
Application
Remarks
Refer to
Section
6.3.2 (1).
It is not possible
to replace only
the backlight.
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