1-7
Localizing the Problem
If Power-Up Checks FAILED
The following conventions are used to represent the LED’s throughout this chapter.
LED Sequences
The LED error sequence will show two states, pass or fail, which are outlined below. The
suspect assembly is given in the following tables, before moving on consult the section
"Self-Test Diagnostic Result".
No Failures
Detected The LED’s will light for approximately 10 seconds, then all will turn
off.
Lit for 10 seconds.
Failure Detected 1 The LED’s will initially all light.
2The next pattern blinks rapidly, and shows that an assembly has
failed.
3The third sequence flashes twice and gives further information on
the area of the board that has failed.
4The LED’s will light then go out.
Table 1-2 LED Conventions
LED shown in tables Represnts
A ’lit’ LED
An ‘off’ LED
A flashing LED
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