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2
ST43401N/ND and ST43402ND Reference Manual, Rev. C
The following procedure provides an overall check of the DC voltages used
by the drive. Before performing this procedure, you should be familiar with the
other information in this section and the safety information in the preface.
The illustration to the right shows where
the individual voltages appear on the
drive's DC power connector (J15).
Insert your test probe into the contact
openings on the back surface of the 4-
pin DC cable connector.
1. Using system software, command
continuous read/write operations
with the drive on a single cylinder.
2. Connect the voltmeter ground lead
to J15 - Pin 3 (+5 V Return [Ground]).
3. Measure at the appropriate connec-
tion point to check the following
voltages:
Voltage
Connection
+5.0 volts
J15 - Pin 4
+12 volts
J15 - Pin 1
Identifying assemblies in the drive
The drive's major assemblies and components are shown in Figures 1 and 2.
The components are supported by a chassis, and the head and disc assembly
(HDA) is supported by shock mounts attached to the chassis. The control
board is mounted above the HDA. The power board has a right-angle
connection to one end of the control board. An optional bezel is available.
DC Power
Connector
J15
Insert
Probe
Here
DC
Power
Cable
Specification
+4.75 to +5.25 volts
+11.4 to +12.6 volts
+12 V
+12 V
Return
Pin 1
+5 V
Pin 2
Return
Pin 3
+5 V
Pin 4
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