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2 . 0
FAULT DETECTION
2 . 1
SCOPE
This chapter covers operations and observations that you can perform to
determine where a fault is occurring in the IBM 900 1 .
"Computer Startup" assists you in determining the causes of fau lts that
occur during the computer startup .
Testing" helps you isolate a mal functioning CRU from the resu lts of the
automat ic diagnostic testing .
may not be indicated during these initial st ages of operation .
Sect ions 2 . 2 and 2 . 3 do not iso l ate the cause of your system ' s problem,
refer to the section that covers the particular device .
keyboard , on which the fault is indicated or a mal function appears .
In many cases, observation is sufficient to determine the CRU to be re
p l aced .
In other cases , you are referred to optional checks in other
sect ions of the manua l .
refer to Chapter 5 , "Removal and Replacement Procedures . "
2 . 2
COMPUTER STARTUP
Prior to powering on the IBM 900 1 , inspect it to ensure that a l l cables
are connected , a l l fuses are in good orde r , and the ROM plug-in drawer
is seated prope r l y . See Figure 5 - 1 2 .
When you power on the IBM 9001 , you should observe these three
distinct sets o f events (most events within a set occur s imult aneous ly) :
Set 2
Set 1
Fans s t art
"Beep" is heard
Onl ine LED l ights
Printer j usti fies l e ft
R ibbon shifts
Power Supply LEDs l ight
Section 2 . 3 , "Automatic Diagnostic
The remaining sections cover faults that
When a fault is detected and isolated to a CRU,
Set 3
"Beep" stops
On l ine LED goes out
Keypad LEDs f l ash
Test results disp l ayed
Section 2 . 2,
For examp le, the
fairly
Quick "beep" is heard
Printer jus itifes to l e ft
Test Complete LF.D lights
CRT f lashes RAM size
CRT displays CSOS label
Fault Detection 2 - 1
If
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