Specifications

158 Chapter 7

Periodic Adjustments

Some assemblies or combinations of assemblies require periodic

adjustments to compensate for variations in circuit performance due to

age or environment.

There are two types of calibration data:

• Factory-generated digital data either on memory cards, or on ROMs

(which are on the assemblies themselves)

• Data generated internally by running calibration programs

In either case calibration data is loaded into non-volatile memory on the

A2A31 Controller.

NOTE

Because calibration data resides on the A2A31 Controller assembly, it is

important that whenever the assembly is replaced that the data be

transferred from the original assembly to the new one. The calibration

data resides in a socketed EEPROM which can be moved with little

danger of losing its contents. Refer to the instructions accompanying

the replacement assembly for details.

To download calibration data supplied on a memory card, follow the

instructions that come with the replacement assembly. To create and

download calibration data for assemblies requiring a periodic

adjustment, follow the steps later in this chapter. For a summary of

assemblies and their calibration requirements, see Table 7-1 on page

159.