Compaq W4000 Manual De Usuario

Technical Reference Guide 

Table 4-16.  System Operational Status LED Indications 

l Status LED Indications

 

 
 

Table 4-16. 

System Operationa

Sy
S0: System on (normal operation) 

Steady green 

Green w/HD activity 

S1: Suspend 

Blinks green @ 1 Hz 

Off 

S3: Suspend to RAM 

Blinks green @ 1 Hz 

Off 

S4: Suspend to disk 

Blinks green @ 0.5 Hz 

Off 

S5: Soft off 

Off - clear 

Off 

Processor not seated 

Stead

Off 

CPU thermal shutdown  

Off (system p

n) 

Off (system powers down) 

 er

Blinks red @ 1 Hz 

Off 

er supply rowbar activated 

.5

 

Off 

stem off 

Off 

Off 

  

stems feature a v

 of the power supply ass

ly. All systems also 

de a system board connection for a processor fan, which is prese

units.  Desktop and 

gurable Minitower systems provide an auxiliary chassis fan. All fans are controlled through 

y red 

owers dow

ROM

ror 

 c

Pow

Blinks red @   Hz

Sy

 
 

 

 

ll sy

rovi

onfi

temperature sensing logic both on the system board and in the power supply. Electrically, there 
are slight differences between the Small Form Factor (Figure 4-11) and the desktop and 

eration is the same.  

 
An ASIC monitors a thermal diode internal to the processor and provides a Fan CMD signal that 

e Speed Control logic uses to vary the speed of the fan(s) through the negative terminal of the 
n(s). The turning off of the fan(s) as the result from the

g placed 

ondition is initiated by the control ASIC asserting the Fan Off- signal, which results in the 

n/Off Control logic shutting off the +12 volts to the fan(s).  

he main differences between the system types are as follow

  In the Small Form

system the processor fan, controlled by a separate speed control 

ci

t, is mounte

nt of the chassis (separate from

heat sink

conduct  across

heat sink by an air ba

.

  Desktop onfigurable Minitower systems use an integrated heat sink/fan assembly, with all

fans speed-controlled by the ASIC through the power supply so that a thermal condition of 
the processor or power supply will affect all fans simultaneously.   

 

ypical cooling conditions include t

lowing: 

1.  Normal – Low fan speed. 

n(s). 

4.  Sleep state – Fan(s) turned off. Hot processor or power supply will result in starting fan(s). 
  

 
A

ariable-speed fan as part

emb

nt in all 

p
C

configurable minitower (Figure 4-12), although functionally op

th
fa

 system bein

into a Sleep 

c
O
 
T

s: 

 

 Factor 

d in the fro

♦

rcui

ed

/C

 the 

  

 assembly) and air is 

 the processor's 

ffle

 

♦

T

he fol

 

2.  Hot processor – ASIC directs Speed Control logic to increase speed of fa
3.  Hot power supply – Power supply increases speed of fan(s). 

 

 

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