Specifications

Winchester Disk Power Checkout for the Model 400t and
425t System Units
Perform the followingsteps to check the voltagessupplied to the disk drives. You
need a
voltmeter to perform these steps.
1,
2
3.
4.
5.
Make sure that the systempower is off and the power cord unplugged.
Remove the system cover.
Ensure that the power eonneetor @2 or P3) is securelyattached to the
Winchester disk drive.
Plug in the systemunit’s power cord and power on the system,If the fan
does not start tos in, check out the power sup ly as described in the
previous section,
~ 1
wer Supply Verificationfort e Model 400t, 425t, and
4oodl Systemr.
U= the voltmeter to teat the voltagesat the power supply input axmec-
tor to the Whichester drive. Urmhw P2 or P3 to check the voltaees.
Figure 4-13 showsthe connect~r m“ltages.
1234
:::::.::~
+12Vdc +5Vdc
+12 V dc Return +5 V“dc Return
Figune4-13. Disk Drive Fbwer Supply Input Connector (P2 or P3)
6.
7.
If the voltagesare not withins
r’ ~
ifieations,see Table 41 and perform
the power supplycheckout as escnbed in the reviousseetion,
Fbwer
Supply K@ication fbr the Model 400t, 425t, an 400dl
Systems.
If the power supplychecksout within specificationsand the problem
F
rsists,cheek the “umperomdigurations for the disk drive (refer to
d“
hapter 3 for the ~k Jumper configurations).
Troubleshooting
4-21