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9 Troubleshooting and Maintenance
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
9-6 Cle
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9-6-1 Cleaning
9-6 Cleaning and Inspection
Use the cleaning and inspection methods described here for regular maintenance of the devices.
To keep the Serial Communications Unit in optimum condition, regularly clean the Unit, as follows:
• Wipe the surface of the Unit with a soft, dry cloth.
• If you cannot remove any dirt with a dry cloth, moisten the cloth with a mild detergent diluted to 2%,
and squeeze out any excess moisture before you wipe the Unit.
• Do not adhere materials, such as gum, vinyl, or tape to the Unit for long periods of time. This may
cause scratches on the device. Remove any adhered materials when you clean the Unit.
Precautions for Correct Use Precautions for Correct Use
Never use benzene, paint thinner, or other volatile solvents, and do not use chemically treated
cloths.
To keep the Unit in optimum condition, you must perform regular inspections. Normally, inspect the
devices once every six months or every year. Inspect the devices at more regular intervals when they are
used in environments subject to high temperatures, high humidity, or high dust levels.
Prepare the following materials before you perform any inspections.
Materials Required Daily
For daily inspection, a cross slot screwdriver, flat-blade screwdriver, tester (or digital voltmeter),
industrial strength alcohol, and all-cotton cloth are required.
Materials Required Occasionally
For some inspections, a synchroscope, a pen oscilloscope, a temperature gage, and a hydroscope
will be required.
9-6-1 Cleaning
9-6-2 Inspection
Materials for Inspection