Specifications

Chapter 4 97

Preventative Maintenance

Maintenance Procedures

Cleaning the Air Filter

NOTE

The cleaning interval is dependent on the environmental conditions

and application, it can be as often as six months in extremely dusty or

dirty environments or as long as two years in a clean, well maintained

facility.

The Test Set’s internal air filter requires periodic cleaning. Failure to

periodically clean this filter may result in decreased internal airflow,

increased internal operating temperature, and early failure of the Test

Set.

1. Remove the front frame and external cover to access the air filter,

see Figure 4-1 on page 99. It is not necessary to remove the rear

frame. Refer to Chapter 5 , “Disassembly,” on page 101 for removing

the front frame and external cover.

2. Lift the filter from the Test Set’s chassis. Use a vacuum to clean the

filter. Use only a static-free vacuum cleaner or ionized air for the

removal of dust and debris.

Memory Backup AA Battery

Two battery sources are used to maintain the contents of the Test Set’s

memory when power is disrupted. One source is a set of two AA

batteries mounted behind the rear frame of the Test Set. You must

periodically change these batteries. The second battery source acts as a

backup to the AA batteries. It is internally mounted and is not user

serviceable.

CAUTION

Replace these batteries every 2-3 years. Failure to take prompt action

may result in loss of RAM data including IBASIC programs and

SAVE/RECALL states stored in the RAM.