Acer Altos R700 Series Manuale Utente Scaricare il pdf (Pagina 109)

Diagnostic LEDs

To help diagnose POST failures, a set of four bi-color diagnostic LEDs is

located on the back edge of the baseboard. Each of the four LEDs can

have one of four states: Off, Green, Red, or Amber.

The LED diagnostics feature consists of a hardware decoder and four

dual color LEDs. During POST, the LEDs will display all normal Port80

codes representing the progress of the BIOS POST. Each postcode will

be represented by a combination of colors from the 4 LEDs. The LEDs

are in pairs of green and red. The post codes are broken into two

nibbles, an upper and a lower nibble. Each bit in the upper nibble is

represented by a red LED and each bit in the lower nibble is

represented by a green LED. If both bits are set in the upper and lower

nibble then both red and green LEDs are lit, resulting in an amber

color. Likewise, if both bits are clear then the red and green LEDs are

off.

During the POST process, each light sequence represents a specific

Port-80 POST code. If a system should hang during POST, the Diagnostic

LEDs will present the last test executed before the hang. When reading

the lights, the LEDs should be observed from the back of the system.

The most significant bit (MSB) is the first LED on the left, and the least

significant bit (LSB) is the last LED on the right.

Note: When comparing a diagnostic LED color string from the

baseboard to those listed in the diagnostic LED decoder in the

following tables, the LEDs on the baseboard should be referenced

when viewed by looking into the system from the back. Reading

the LEDs from left to right, the Hi bit is located on the left.

Post Code table:

Post

Code

Diagnostic LED Decoder

DescriptionG=Green,R=Red,A=Amber

MSB LSB

07h Off G G G Uncompress various BIOS

Modules.

08h G Off Off Off Verify password Checksum.

BS811.f/cppl!!Qbhf!::!!Uvftebz-!Opwfncfs!37-!3113!!21;19!BN

1 2 ... 104 105 106 107 108 109 110 111 112 113 114 ... 134 135

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Acer Altos R700 Series Manuale Utente Pagina 109