Chapter 3. Maintenance Aids; Introduction; Switches And Indicators; Operation Tests - IBM 3278 Series Maintenance Information

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Chapter 3. Maintenance Aids
3.1 Introduction
Maintenance aids for the 3278 Display Station include switches, indicators, and diagnostic tests.
3.2 Switches and Indicators
The 3278 switches and indicators are described in Figures 4·1 and 4·2 in Chapter 4.
3.3 Operation Tests
Operation tests are used to sense failures both for problem determination and for repair verification. Both offline and
online tests are available.
3.3.1 Offline Tests
The 3278 offline tests are in 3278 logic. The test logic is activated by setting the Normal/Test switch to the Test position,
taking the 3278 offline to its control unit, and putting it in test mode. There are three test modes: Test Mode 1,
Test Mode 2, and Test Mode 3.