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Chapter 5
Replaceable Units
Cubix provides a segmented passive ISA compatible backplane in all Resource Subsystems.
The segments are labeled on the backplane of the Resource Subsystem as "Group 1", "Group 2", etc.
When installing a Cubix BC Series processor in a segment, the BC Series board should be installed in the leftmost slot of the Group (refer to backplane illustrations in Appendix A).
Installation/Replacement Instructions:
1. Turn off power to the subsystem.
2. Unplug the power cord.
3. Remove the cover from the unit.
4. If replacing an existing BC Series processor, remove the retaining screw from the BC "L" bracket and remove the BC board.
5. If adding a new BC Series processor, remove the screws securing the blank "L" bracket from the rear I/O panel in line with the vacant slot desired. Remove the "L" bracket.
6. Install one Cubix BC Series bus controller board into each segment, or group, as desired. Secure each board with the screw located in the blank filler panel.
7. Connect the cables between the BC Series board and the multiplexor panel. The multiplexor panel connectors are documented in Chapter 2 of this manual; the BC Series connectors are defined in the documentation provided with the BC Series processor. Verify that a monitor and keyboard are connected to the multiplexor panel via the rear panel of the subsystem, and turn on the power.
8. Run the setup program on each BC Series processor. Refer to the setup documentation provided with the BC board.
9. Turn off the power to the subsystem.
10. Install any other peripheral boards.
Replacement Instructions:
1. Remove power from the Cubix Resource Subsystem.
2. Carefully disconnect all cables from all installed boards.
3. Remove all boards from the backplane.
4. Remove the nine power supply leads from the ISA backplane by loosening the nine securing screws.
5. Disconnect the cable to the multiplexor panel.
6. Remove the ten screws securing the ISA backplane to the drawer.
7. Remove the backplane.
8. Replace the backplane and reassemble in reverse order.
When adding a disk drive, install the drive in the same numbered position as the segment or group the drive will service.
Installation/Replacement Instructions:
1. Shut power off to the Cubix Resource Subsystem with the front panel switch.
2. Disconnect the A.C. power cord from the rear on the rear I/O panel.
3. Remove the six screws securing the top cover, and remove the cover.
4. Remove the Disk Drive Bay cover plate.
5. Remove the handles and the front panel.
6. If installing a new drive, remove the two screws securing the desired filler panel. If replacing an existing drive, remove the screws securing the present drive.
7. If replacing a drive, disconnect the power connector and the ribbon cable from the drive.
8. Remove the drive or filler panel by pulling forward.
9. If replacing a drive, remove the four screws securing the drive mounting brackets to the drive.
10. Attach the drive mounting brackets to the left and right side of the new drive using the four screws provided. Keep the bracket mounting flanges pointing away from the drive.
11. Install the drive assembly into the correct drive slot.
12. Secure the drive with two screws to the front of the drive mounting bay.
13. Connect the drive power and data cables. If the drive is dedicated to a single BC Series processor, connect the data cable directly to the BC Series board and connect the power cable to the power source on the multiplexor panel provided for the segment containing the BC processor board. These connectors are J9 - J16 corresponding to segments 1 - 8.
If the drive is to function as a multiplexed floppy drive, connect the data cable to connector J40 and the power cable to J17 on the multiplexor panel.
14. Follow the instructions in reverse order to reassemble.
The CMOS Battery pack for the BC Series processors is mounted on the underside of the upper fan housing.
Replacement Instructions:
1. Turn off power and disconnect the power cable from the subsystem.
2. Remove the top cover.
3. Lift up the upper fan housing cover. It is hinged on the right side of the subsystem.
4. While holding onto the battery housing, remove the two screws from the top of the cover that secure the battery cover to the housing.
5. Remove the battery pack from the battery housing.
6. Install new batteries in the battery pack, observing the proper polarity. Reinstall the battery housing and reassemble the subsystem.
Installation Instructions:
To install an auxiliary junction panel:
1. Remove power from the Cubix Resource Subsystem.
2. Remove the nine screws securing the blank panel at the top of the rear I/O panel.
3. Using the same screws, attach the auxiliary I/O panel to the rear I/O panel.
To install the Cubix adapter boards into the auxiliary junction panel:
1. Using the screws on the connector housing on the Cubix I/O adapter board, attach the adapter board to the auxiliary junction panel directly above the processor card it will service.
2. Attach the I/O adapter board to the internal header on the Cubix processor board. Refer to the documentation provided with the processor board for installation instructions.
Replacement Instructions:
1. Turn off power and disconnect the power cable from the subsystem.
2. Disconnect all cabling from the rear panel of the subsystem.
3. Remove the subsystem from the System Cabinet, and place it on a work bench or sturdy work surface.
4. Remove the four screws from the panel on the right side of the subsystem. The power supply is fastened to this side panel.
5. Remove the wiring from the terminal strip.
6. Remove the power supply, replace with a new power supply, and reassemble the subsystem.
Replacement Instructions:
1. Turn off power and disconnect the power cable from the subsystem.
2. Remove the top cover from the subsystem.
3. Remove the front panel.
4. Disconnect all cables and connectors from the multiplexor panel.
5. Remove the two screws from the multiplexor panel mounting bracket.
6. Carefully slide the multiplexor panel out the front of the housing.
7. Install the new multiplexor panel. Secure it with the two mounting screws, connect all of the cables, and reassemble the subsystem.
There are two fans in a Cubix Resource Subsystem: the top fan located on the swingout metal bracket, and the power supply fan located on the rear of the subsystem.
To remove the fan mounted on the top swingout panel:
1. Loosen the fan cable by clipping the tie wraps.
2. Remove the fan cable from its connector. It will probably be necessary to remove the five screws on the multiplexor panel in order to gain access to the fan connector.
3. Remove the fan from the top panel by removing the four bolts and nuts.
4. Install the replacement fan.
To remove the fan mounted on the rear of the subsystem:
1. Remove the four screws securing the right side panel to gain access to the fan.
2. Remove the fan cable from its connector J3 located on the backplane.
3. Remove the fan from the rear of the subsystem by removing the four screws and nuts.
4. Install the replacement fan.
5. Reassemble in reverse order.
