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visible. If no segments are visible, the line voltage is low but still okay; if all sixteen
segments are visible, the line voltage is high but should be checked.
If the
LOW LINE VOLTS
is unacceptably low. Either the AC line configuration switches at the rear of the
drive or the AC line voltage itself may need to be changed. Consult Chapter 8 for
information regarding the use of the configuration switches.
4.5.8.7 SCSI Diagnostics Function
The
SCSI DIAGNOSTICS
information to help analyze and diagnose problems. As such, it should only be used
while under the direction of trained factory personnel.
4.5.9
Service Sub-Menu
The Service sub-menu contains three functions that are used by qualified service
personnel after performing corrective maintenance.
4.5.9.1 Skew Check
The Skew Check function allows a service technician using an oscilloscope and
special skew tape to check read skew. This function is fully documented in the
technical service manual.
4.5.9.2 PROM Change Function
During the General Tests, which are also performed each time the drive is switched
on, the checksums of all EPROMs in the drive are read and compared with those
stored in the drive's non-volatile memory. If there is a mismatch, the drive reports
an error on the LCD. If an EPROM is replaced and the drive is not told about the
new checksum, it will report an error each time it is powered up or whenever the
General Tests are run from the Diagnostics sub-menu.
Activating the
store their checksums in non-volatile memory. In addition, all parameters in the
Drive Configuration menu are reset to their factory defaults. This function must be
invoked whenever an EPROM for the Write Executive, Motion, or SCSI CPUs or
whenever an EPROM pair for the Write or Read DSPs has been changed. Note that
moving W1 on the WREX PCBA from ON to OFF disables this function and causes
the display to read
After replacing EPROMs, their checksums should be displayed and compared with
the checksums written on their labels using the following procedure:
EPROMs should only be removed and replaced by a qualified technician
observing proper ESD procedures.
4-22
message appears on the liquid crystal display, the line voltage
function is designed as a tool to provide the factory with
function causes the drive to poll all EPROMs and to
PROM CHANGE
.
FEATURE LOCKED
CAUTION
Menu Operations
500300 Rev. U
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