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Appendix
1. Installing Optional Equipment
RS7000 281
Procedure
1. Use SCSI cables to daisy-chain the external SCSI devices.
• There are several types of SCSI connector. Use SCSI cables appropriate for your devices.
2. Connect the power cable of the external SCSI device to an AC outlet.
3. Set the SCSI ID (0 - 7) of the external SCSI device.
• Select a SCSI ID that will not conflict with the other SCSI devices (including the RS7000). When the RS7000 is shipped from the
factory, the SCSI ID is set to 6.
4. Attach the terminator to the SCSI connector (the vacant one of the two SCSI connectors) of the last device in the daisy-chain.
Alternatively, turn on the terminator switch of that device.
5. Make sure that the terminator switch is turned OFF for all other devices in the daisy-chain (i.e., all devices other than the last
device).
6. Turn on the power of the external SCSI device(s), and after waiting several seconds, turn on the power of the RS7000.
■ Realities of terminator installation
Although we have said that a terminator is required at the beginning and end of the SCSI bus, this is a general principle and not a
requirement. For example if the bus is extremely short (45 cm or less), there are cases in which it is best for there to be a terminator
only on one or the other end. However if other drives are connected in addition to these drives, the situation will again be different.
Also, if the SCSI devices are separated by more than 3 meters, it is said that using a terminator at the 3 meter point is preferable. In
this case, three or more terminators will exist within the SCSI bus.
In this way, the theory and practice of SCSI connections can differ widely. Simply changing a drive in a system that had been work-
ing correctly can cause operation to become unreliable, or adding a drive to an unreliable system can cause it to start working cor-
rectly. In practice, a certain amount of trial and error is necessary.
■ Reasons for SCSI errors
A SCSI bus operates stably only if all the connected SCSI devices are operating correctly. If any of the devices are producing noise,
the other devices will also produce errors, and in the worst case, the boot block of a drive can be destroyed. (All data in that drive
will be lost.)
Also, there are cases in which a system on which data appears to have saved may not have actually saved the data, resulting in data
loss.
The following paragraphs will discuss the reasons for such errors, and will provide a sequence for your troubleshooting.
• Check the SCSI ID
Make sure that there is no conflict between the SCSI ID of each SCSI device including the RS7000. When shipped from the factory,
the RS7000’s SCSI ID is set to 6. Be sure to turn off the power before changing the SCSI ID setting of the external SCSI device.
• Check the terminator
As discussed above, check the location where the terminator is attached.
• Check the SCSI cables
Low-quality SCSI cables will almost always create problems. Always use double-shielded cables. It is also important that the shield
be grounded inside the connector. Long SCSI cables frequently cause problems, so use as short a SCSI cable as possible. Bending or
twisting a SCSI cable in a confined space can cause conductors to break or pins to be broken, so be careful to avoid this.
Operation is not guaranteed if the SCSI connector of the RS7000 is connected via a converter to any external device other than a 50-
pin SCSI device (such as a Wide SCSI, ATA (IDE), USB, or IEEE 1394 device).
NOTE
Many articles and books concerning SCSI are available. However most of them discuss only the concepts or
the specification, and do not tell you what to do if the system does not work when connected as described.
The following paragraphs will provide more information about SCSI that will help you correct problems which
may occur when SCSI devices are connected. Please read this material if you experience problems. Please
be aware that when connecting SCSI devices, problems with termination and cabling can cause valuable
data to be damaged. We regret that Yamaha can take no responsibility regarding any data which is lost.