IBM 5251 11 Maintenance Information Manual page 85

Power-On Diagnostic Flowchart (Part 3 of 3)
The numbers indicate the sequence of major areas of
adapters the power-on diagnostic checks.
Status Switch
0 1 - - - - - - - -
j P i ; ; r - - - - - -
I
I
Keyboard
Adapter
II
I/O Check
e
Keylock
Keylock
Adapter
1--66
-------,
I
Read-Only
I
Storage
I
I
I
I
Microprocessing
I
Unit
MPU Check
D
I
CD
To
Controller
To Next
Terminal
_---:(-+-
Cable Thru
Feature
"
4
I
I
e
fJ
Stora~e Check
I
Read/Write
I
Storage
I
I
e
Cable Display
Adapter Adapter
G-
0 Line Check
"~
Line Sync
e
0
Internal Check
CD-
0
Storage Check
e
0
Ready
Brightness ,
Contrast
lI...£able
Che~
_ _ _
II
Display _ _
2
Address
Switches
lID
T
Horizontal, Vertical,
and Video Signals
.-------
Power
Supply
Power
Switch