Digital Equipment VAXstation 3100 Maintenance Manual page 174

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Expansion Boxes 153
6.3 TK50Z Expansion Box
Two TK.50Z expansion boxes are available: the TK.50Z-OA and the TK.50Z-
FA. The TK.50Z-OA expansion box contains external switches for setting the
SCSI address and the TK50Z-FA expansion box does not. The TK50Z-FA
expansion box must be opened to set the SCSI address using jumpers. You
operate and troubleshoot both expansion boxes the same.
The TK.50Z-OA expansion box contains five FRUs: the TK.50 tape drive,
a TZK.50 controller board, a power supply, a SCSI ID switch board, and a
resistor load board (to regulate the power supply). The TK50Z-FA expansion
box contains all of the same FRUs, except for the SCSI ID switch board.
Figure 6-18 shows the TK.50Z expansion box.
TK50
MA·XDl77·11
Figure 6-18 TKSOZ Expansion Box
The TK.50Z expansion box connects to the system box through the external
SCSI port. The SCSI cable connects to either of the two ports on the back
of the expansion box. The SCSI terminator must be installed on the unused
connector unless another expansion box is daisy chained. If the external SCSI
port already has a box connected to it, you must use another cable to connect
the TK50Z expansion box to the last box on the daisy chain. Be sure to move
the terminator onto the unused coruiector on the back of tl1e last expansion
box in the daisy chain. Figure 6-19 shows how the TK50Z expansion box
connects to the system box.