Yamaha AW2816 Owner's Manual Page 18

  • Download
  • Add to my manuals
  • Print
  • Page
    / 420
  • Table of contents
  • TROUBLESHOOTING
  • BOOKMARKS
  • Rated. / 5. Based on customer reviews
Page view 17
9
Before you begin
Operation section
2
Attach a terminator to the last SCSI device
in the chain.
A “terminator” is a device that terminates the
SCSI signal at the end of the chain, and is nor-
mally attached to the vacant SCSI connector of
the last device in the daisy chain. If the SCSI
device itself has a built-in terminator, turn it on.
(For details on how to turn on the internal termi-
nator, refer to the manual of your SCSI device.)
Before using an external SCSI device, you will need to
format it. For details on this procedure, refer to
page 160.
About terminators
“Termination” refers to the process of applying a resis-
tor appropriate for the impedance of the SCSI bus to
terminate the end of the circuit. The resistor required
for this is called the “terminator.” Normally, a termina-
tor must be installed at the beginning and end of the
SCSI bus (in the case of the example in the previous
page, this would be the AW2816 itself, and the SCSI
device connected to the end of the daisy chain).
However, this is only a general principle, and is not
an absolute. Depending on the combination of SCSI
devices, the order of connection, or on the length of
the SCSI cables, there may be cases in which better
results are obtained by terminating only one end of
the chain. If problems occur such as the AW2816 fail-
ing to start up when an external SCSI device is con-
nected, try defeating the terminator of the external
SCSI device. (The terminator inside the AW2816 is
always on, and cannot be defeated.)
About SCSI errors
The SCSI bus is able to transfer data in a stable man-
ner only if all connected SCSI devices are operating
correctly. If the SCSI bus of the AW2816 is connected
to a device whose operation is unstable or which pro-
duces noise, errors may occur in other devices, or the
AW2816 may fail to start up correctly. If such prob-
lems occur, check the following points.
Check the SCSI ID
Make sure that the SCSI ID of each SCSI device
(including the AW2816) does not conflict with the
SCSI ID of any other device. The SCSI ID of the
AW2816 is fixed at “6.
Check the terminator
Check the location of the terminator. Under certain
conditions, better results may be obtained by termi-
nating only one end of the SCSI chain.
Check the SCSI cables
Since errors are often caused by low-quality SCSI
cables or unnecessarily long SCSI cables, you
should avoid using such cables. Please use double-
shielded cables that are as short as possible. It is
also important that the shield within the cable is
grounded to the connector.
External SCSI devices with 25-pin connectors
Most SCSI cables with 25-pin connectors at both
ends do not meet SCSI specifications. For this rea-
son if the system includes a SCSI device that uses a
25-pin connector, the problems may be due to this
type of cable.
Daisy-chain connection
Sometimes the operation of a SCSI bus will be
unstable because of daisy-chain connections. Con-
nect only the SCSI device you are using to the
AW2816.
Power supply of SCSI devices
When using the system, turn on the power of all
connected SCSI devices. Operation of the SCSI bus
cannot be guaranteed if one of the connected
devices is not turned on.
Page view 17
1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 419 420

Comments to this Manuals

No comments