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c.
D.
E.
Switch the system
unit poweroff,
remoye the power su ply screws,
[
and slide the power supply out about 3 inches. Switch t e power on
and 'e=ure'hew'tagsont
hewrwrsuk'p'ywnnwtom'
a
shown m Figure 4-16 and Fqptre 4-1 (teave t e connectom con-
nected to the power sup ly and measure the voltages through the
!
rear of the connector). f the voltages are not present, go to Step
D. If the voltages are present, go to Step E.
Check Pin M on the large connector shown in Figure &16 for + 5
V dc If the voltage is not correct, replace the power supply.
If the voltage is correct at Pin 24, close the power-on switch. If you
read Pin Mat ground, replace the pcwr su ply. If you still detect
+ 5 volts, replace the
F
E
wer-on switch. If t e new switch dc&sn't
fix the problem, go to tep E.
Either the wver distribution cable. motherboard. or CPU board is
defedive. ~heck the power distribution cable for'continuity. If the
pmer distribution cable is defective, replace it. Otherwise, replace
the CPU board and recheck the voltage test points. If the voltages
are not present, replace the motherboard.
5. If the volts es are present at the CPU board or power supply test points
B
but not wit in tolerance, perform the followingsteps
A.
B.
c.
D.
Power off thes
tern unit and unplug the ac power cord horn the
power supply. K eplace the power supply.
If the problem persists, reinstall the ori inal power supply and fol-
low the information in this step to che& forpowerloacIingbya
board. Power off the system unit and remove one board other than
the CPU board. Power on the system unit and retest. If necessary,
repeat this rmedure for a second board. If you replaw a defective
t
board, con gore any switchesor jumpers the same as the originaI
board.
If a board dcm not appear to have caused the problem, power off
the system unit and unplug the power cord from the power supply.
Reinstall the boards in their slots.
Un lug the internal mass storage power distribution cable from one
{
oft e mass storage devices. Power on the system unit and recheck
the volts es. If necessary,repeat this step for each internal mass
t"
storage ewe. Replace the mass storage device if the voltages are
within specifications.
Trouble-shooting
4-25
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