Digital Equipment VAXstation 3100 Maintenance Manual page 170

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Expansion Boxes 149
.5. Remove the resistor load board from the standoffs on the shield
(Figure 6-15).
Figure 6-15 RZ55 Expansion Box Resistor Load Board
6. Replace the resistor load board by reversing the previous procedure.
6.2 RRD40 Compact Disc Expansion Box
The RRD40 compact disc expansion box
is
one PRU. There are no replaceable
components inside the box. When you detect an error in the RRD40 compact
disc expansion box, replace the whole box as one PRU.
The RRD40 compact disc expansion box connects to the system box through
the extemal SCSI port. The SCSI cable connects to either of the two ports
on the back of the expansion box. Install the SCSI tenninator on the unused
connector, unless another expansion box is daisy chained. If the SCSI port
already has a box connected to it, use another cable to connect the RRD40
expansion box to the last box on the daisy chain. Be sure to move the
terminator onto the unused connector on the back of the last expansion box
in the daisy chain.