IBM 3274 51C Maintenance Information page 13

Alt IML
Address 8 4 2 1
0000
Ref Description
o
On/Off switch:
fTl
=
On;
lQJ
=
Off.
D
On indicator: Indicates the 3274 is on.
D
IML (Initial Machine Load) pushbutton: Pressing and holding causes a basic
test to run. When the pushbutton is released, IML tests start. At comple-
tion, the machine is loaded.
o
Alt IML Address switch:
• 1: Holding, while momentarily pressing the IML pushbutton, bypasses
the tests and loads the machine directly. Use only after normal
IML fails.
• 2: Holding, while momentarily pressing the IML pushbutton, invokes
adapter and wrap tests.
Used Only with Integrated Modems
• 3: Holding the AL T IML Address switch in AL T 2 will cause the
Modem Self-Test to be initiated and repeated approximately every
4 seconds until the switch is released.
8 4 2 1 indicators: These indicators light while the IML pushbutton is held.
During IML, they follow the test sequence. At completion, they go out. During
operation, they indicate operational status.
Figure 1-8. 3274 Models 51C/52C Basic Operator Controls
1-8