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21020285 D User’s Guide
Chapter 3 Hardware Installation
Page 3 - 10 Step 2: Jumpers and Termination
SCSI bus
Termination
Each end of the SCSI bus cable must be terminated to prevent corruption of the
data and control signals. The RF3880 adapter has terminator packs on the board.
These are removable in the case that the adapter is not at the end of the SCSI
cable.
The adapter provides termination power on the SCSI bus cable. This line is
fused on the board. The fuse is replaceable.
The location of the terminators and removable termination power fuse are
shown in the following illustrations.
The following figure illustrates the board termination.
Note
Two types of SCSI bus
terminators are used on
the RF3880 mother
board. The first two in
each column, closest to
the SCSI connector, are
330—ohm SIPs, and the
others are 150—ohm
SIPs.
Figure 11 Board Fuse and Terminators
Note
It is very important to
replace the termination
fuse with an exact
equivalent. If you
replace the termination
fuse with a value lower
or higher, you risk
continued problems or
damage to the RF3880
and attached equipment.
Replacement Fuse
In the event that the termination power fuse is blown, replace it with:
Littlefuse P/N 273-002 or equivalent