NEC Express5800/140Hb, Service Manual

Page: 133 / 258

Disassembly and Reassembly 4-33
Removable Media Devices
A 1.44 MB diskette drive is always mounted in bay A. A CD-ROM drive is
factory mounted in bay D. Any SCSI removable media device can be installed
in peripheral bays B, and C. The SCSI devices should be installed in the first
available bay from the bottom (bay C).
Figure 4-28 illustrates the recommended removable media configuration. The
5 1/4-inch bays are intended to hold CD-ROM, tape, or other removable media
drives. SCSI devices in the 5 1/4-inch bays receive control signals from
channel A of the AIC7880 SCSI controller on the system board.
When installing or replacing a 5 1/4-inch device consider the following:
!
The SCSI terminator of an installed 5 1/4-inch device must be set to OFF
and assigned a unique ID (refer to its device manual for setup operations).
!
When installing an internal auto-change DAT (DDS-3), use the power
branch cable attached to the device.
!
When installing an internal auto-change AIT, use the power relay cable
attached to the device.
!
Observe that when installing an internal DLT device the front panel of
the DLT will protrude approximately 1 cm from the front bezel, this will
not affect the operation.
!
When installing a Narrow-SCSI device use the 68 pin (Wide-SCSI cable
connector) to 50 pin (Narrow-SCSI cable connector) conversion adapter
provided with your system.
Note:
All removable media SCSI devices being installed
must have their terminators either disabled or removed.
!
CAUTION
Hard disk drives cannot be installed in a 5 1/4-inch external
bay because the drive generates EMI, is more susceptible to
ESD, and does not have sufficient cooling.