Nikon LS-10 Installation Guide for Macintosh - Manual (Page 31)

The SCSI Interface Chapter 3
Again, the SCSI connector on the Macintosh’s motherboard is a 50-pin flat con­
nector, as shown in Figure 3.9. Note the position of pin 1 and the
safety key.
The safety
key provides a level of protection against inserting the cable improperly.
Connecting to the Internal SCSI Connector
Page 24
Figure 3.9 The 50-pin flat SCSI connector inside the Macintosh on the motherboard.
If for some reason you choose not to use the internal SCSI cable provided with
your Coolscan (you won’t be using it for installing Coolscan in the Macintosh Quadra
Series), note that there is a wide variety of 50-pin flat SCSI connectors and SCSI cables.
They are all functionally the same, yet vary in some important ways:
1. Some cables might not have a safety key. In this case, take extra precautions to
ensure that the mating cables’ connectors are properly aligned prior to insertion.
2. Some connectors may not have Pin 1 clearly marked on the connector.
3. Some cables may have Pin 1 on the cable indicated in red.
4. Some connectors will not have mechanical side levers to assist in plugging and
unplugging the cable.
Care must be exercised when inserting and removing these 50-pin connectors,
shown in Figure 3.9, as they are rather fragile. Observe the following guidelines when
handling these connectors:
1. Never force the connector in or out. If you bend or break any of the pins,
replacement of your motherboard will be required.
2. Make sure that the mating connectors are aligned properly before inserting. Take
extra care in this very critical step.
3. Push the cable connector gently into the mating connector. Once in place, push
down firmly.
Nikon Coolscan Installation Guide for Macintosh