3274 Operator,Panels (Figures 1-7 Through 1-15) - IBM 3274 User Manual

3274 Operator Panels (Figures 1-7 through 1-15)
Ref
D
fJ
D
II
Alt IML
Address
842 1
0000
2
Description
On/Off switch:
I
=
On;
0=
Off.
On indicator: Indicates the 3274 is powered on.
Of)
Local/Offline indicator: Indicates that the 3274 is in Offline mode.
Power /1 nterface switch:
• Local/Offline: Set to this position, and wait for the Local/Offline
indicator to light before turning off the 3274 or performing a
manual IML.
• Local/Online: Permits turning on the 3274 regardless of the host
system power state.
• Remote/Online: 3274 power is controlled by the host system
power state.
D
IML (Initial Machine Load) pushbutton: Pressing and holding causes a
basic assurance test to run. When the pushbutton is released, IML
tests start. At completion, the machine is loaded.
Ii)
Alt IML Address switch:
• Position 1: Holding, while momentarily pressing the IML pushbutton,
bypasses the IML tests and loads the machine directly. Can sometimes
be used after normal IML fails. Also used to allow a microcode dump
in any 3274 Model A or D.
Warning: Butting the 3274 directly online with the Local/Offline
indicator off and the Power/Interface switch in the Local/Offline
position will cause channel/host errors.
• Position 2: Not operational for locally attached 3274s.
II
8 4 2 1 indicators: These light while the IML pushbutton is held.
During IML, they follow the test sequence. At completion, they all
go out. During operation, they indicate operational status.
Figure 1-7. 3274 Model lA, IB, ID, 21A, 21B, 21D, 31A, 31D, 41A, or 4lD
Operator Panel .
1-18