IBM 3279 2A Maintenance Information page 25

3279 MIM
2.5.3 Test Mode J: Commands
Notes:
1. Use the keyboard diagram (Figure 2-3) to
identify the keys listed below. Do not identify
by key top symbol (although the two may be
identical).
Chapter 2. Maintenance Aids 2-4
4. The display will be green unless specified
otherwise.
5. If any action fails, recheck the test sequence
and the .. exchange logic card C2, then D2, then
read MAP 0000' page 2 and go to MA.P 0100.
2. I9refers to the CONTROL key (see Figure 2-3).
Perform the test in sequence (or the results are
unpredictable) as follows:
3. When a single character is shown in the
'Results' cl!/umn it will appear on the screen in
the first pOSition of the Operator Information
Area (OIA) (bol/om left hand corner). It
is
shown only when the
r~sult
is important.
Enter Test Mode 3 from Test Mode I or 2 by
pressing the CONTROL key (Figure 2-3), or
directly using a jumper - see section 2.7.
Step
(See Notes
1 & 2 above)
I
2
3
4
6
8
9
10
11
12
Press Keys
I9B
BBB
C
@lJ
@IN
19
M ABC ...
19
DO D ...
I9c
@lBW;
@lGA
@I B 0 I
@lBOQ
13 Set the Normal/Test switch
to Normal and bock to
Test
14 @I K I
15
4
16
8
Result
(See Notes
3 & 4 above)
2
6
Test Mode 1 pattern is restored
See Keyboard ID table in Figure 6-11
Monocasa Sw_ Sacurity Kaylock
A,a A
0
A Not installed
&
a.
On (clockwise)
1 B Off (counterclockwise)
ABC ... appear over
cursor; cursor advances
Character over cursor is
displayed at OIA first
position and cursor .dvances
Line I displays
<5
as far
as 'a' two-thirds of the
way along the line.
Display turns red.
Display mainly blue,
some red remains.
Display turns green.
Cursor blinks.
Cursor is inhibited.
Cursor returns but display
is inhibited.