7-3
7 Inspection and Maintenance
CJ2 CPU Unit Hardware User’s Manual
7-1 Inspections
7
7-1-1 Inspection Points
z Required Tools
• Slotted and Phillips-head screwdrivers
• Voltage tester or digital voltmeter
• Industrial alcohol and clean cotton cloth
z Tools Required Occasionally
• Oscilloscope
• Thermometer and hygrometer (humidity meter)
4 Installation and
wiring
Check that each Unit is con-
nected and locked to the
next Unit securely.
No looseness Press the connectors together
completely and lock them with the
sliders.
Check that cable connectors
are fully inserted and locked.
No looseness Correct any improperly installed
connectors.
Check for loose screws in
external wiring.
No looseness Tighten loose screws with a Phil-
lips-head screwdriver.
Check crimp connectors in
external wiring.
Adequate spacing between
connectors
Check visually and adjust if neces-
sary.
Check for damaged external
wiring cables.
No damage Check visually and replace cables
if necessary.
5 User-serviceable
parts
Check whether the battery
has reached its service life.
CJ1W-BAT01
Service life expectancy is 5
years at 25°C, less at higher
temperatures.
(From 0.75 to 5 years
depending on model, power
supply rate, and ambient
temperature.)
Replace the battery when its ser-
vice life has passed even if a bat-
tery error has not occurred.
(Battery life depends upon the
model, the percentage of time in
service, and ambient conditions.)
Tools Required for Inspections
No. Item Inspection Criteria Action
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