Installation Instructions: AM-642 STOP Converter
Page 3
Rev. A01
2. Remove the top and side from the AM-990 chassis, following the instructions in the AM-990
Service Manual.
3. Remove the cover from the card cage.
4. Remove the I/O rear panel so you can insert boards into the card cage.
5. Remove the card cage top bracket (DWF-20304-00). This piece is not needed with the AM-642;
you will not re-install it.
6. Make sure the AM-319-20 is in the bottom slot of the card cage, and the AM-176 is in the third
slot. Take the nylon screw included in the AM-642 kit and screw it into the middle standoff of
the card cage that lines up with the third slot. This prevents the AM-176 board connector from
shorting against the card cage standoffs.
Install the New SCSI Cable
The AM-642 installation kit includes a new SCSI cable. The first connector on this cable is closer to the
end of the cable than on other Alpha Micro SCSI cables, allowing you to easily attach it to the AM-642
connector. If your existing SCSI cable will properly route and connect to the AM-642 after it’s installed,
you can skip this part of the procedure.
1. Carefully unplug all SCSI devices from the SCSI cable, unscrew the external SCSI connector
from the top-mounting bracket, and remove the SCSI cable.
2. Install the new SCSI cable, attaching it to the external SCSI connector and to each existing SCSI
device. Leave the first connector, approximately 6” from the CPU board SCSI connector, empty.
This is where you will attach the AM-642. Do not plug the SCSI cable into the AM-176 SCSI
connector.
3. Remember to plug the external terminator back into the new external connector.
Installing the AM-642
1. Before inserting the AM-642 into the card cage, be sure to set its SCSI ID. To do so, use the dip
switches at SW1, positions 6, 7, and 8. In the following diagram, “On” is toward the center of the
AM-642 board. Do not change any switches other than 6, 7, and 8.
SCSI ID 5
On
6 7 8
1 2 3 4 5
SCSI ID 6
On
6 7 8
1 2 3 4 5
SCSI ID 0
On
6 7 8
1 2 3 4 5
SCSI ID 1
On
6 7 8
1 2 3 4 5
SCSI ID 2
On
6 7 8
1 2 3 4 5
SCSI ID 3
On
6 7 8
1 2 3 4 5
SCSI ID 4
On
6 7 8
1 2 3 4 5
SCSI ID Switches
2. Slide the AM-642 assembly (the AM-642 board itself and its mounting board) into the top slot of
the card cage. The AM-642 faces toward the top of the card cage, with the SCSI connector
toward the I/O rear panel.
