IBM 5150 Manual To Operations page 197

EXAMPLE 5
Ir'~III"IIII1I1IITBDll
Likely problem
I short beep
Wrong or Random
characters or no
System Unit
cursor
Note: If using TV as your monitor, verify that color is correct by
disconnecting from System Unit.
EXAMPLE
6
Color monitor only.
I[ 1~III1I1I1I1I1I8EDl
Likely problem
I short beep
Screen has wrong
or no color
System Unit
EXAMPLE 7
1['~IIII11I1I11I1IEmDI
Likely problem
Obvious TV type
I short beep
~ problems (i.e.
rolling screen
Display
or shadows)
After having display serviced and problem still exists have
System Unit serviced.
Go to Step 5.
PDPs 4-9