Test Mode - IBM 3278 Series Maintenance Information

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3.3.1.3 Test Mode 3
Test Name
Test Mode 3:
Test Logic
Area
Activity
Provides two paths from keyboard to logic:
logic-area test path and data path.
Mode Entry: Press Control key.
Logic Area Test Entry: See the following page for
suggested sequence of logic area tests.
Result
Note: All references to keys to be used in Test Mode 3 are identified
by the diagram shown for Test Mode
2.
(Do not identify keyboard
keys by the characters that appear on the key tops.)
Suggested Logic Area Test Sequence
2
Press C key. Characters keyed in during Test Mode 2 are replaced by Test Mode 1
Press Control key. (Japanese/English Keyboard) pattern; initial power-on status is loaded into status register.
Press B key. 'iappears in first position of operator information area. (Correct
response for power-on status.) (A tone sounds if the audible alarm
feature is installed, on (D) type only.)
Press B three more times (to clear status!'
-t
First position of operator information area becomes
O· .
Press Control key.
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