IBM 5150 Manual To Operations page 196

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EXAMPLE 3
Note: Error messages
mayor may not
remain on screen.
So look quickly. X means any number will appear.
Illl~IIIIIIIIIIIIII~DI
X
Error messages
Likely problem
1 short beep
XXX
201
601
System Unit
131
Parity Check X
EXAMPLE 4
.ll~III1II1III1II~DI
x
Likely Problem
1 short beep
XXXX 301
Keyboard *
*Before having keyboard serviced:
Position System Unit switch to OFF.
Is keyboard plugged into cassette connector?
Are there any obvious objects or foreign material on
keyboard?
If after having keyboard serviced and error 301 still appears
have System Unit serviced.
PDPs 4-8

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