5.10 Replacing the Lightpipe Signal Cable
5.10 Replacing the Lightpipe Signal Cable
Follow these steps to replace the lightpipe signal cable from the DA backplane to
the lightpipe.
The lightpipe split-ribbon cable has a 50-pin connector to the lightpipe and three
10-pin connectors (one for each disk bank) to the DA backplanes.
1. Open the PDA front and rear doors.
2. Turn the PDA circuit breaker OFF.
3. Disconnect the lightpipe signal cable from the 50-pin connector at the bottom
edge of the lightpipe PCB.
4. Remove any cable ties securing the ribbon cable to the enclosure or chassis
and push the cable to the back of the PDA, between the air baffles and the
top.
5. At the rear, remove the far right disk canisters to access the lightpipe signal
connector.
6. Disconnect the ends of the cable from the DA backplane 10-pin connectors.
7. Pull the upper end of the cable down from the enclosure top, through the side
bracket, and remove the cable.
8. Connect the replacement cable 10-pin connectors to the DA backplane.
9. Feed the 50-pin end through the backplane side bracket, and push the end
over the air baffle to the front.
10. From the front, draw the cable forward, and connect it to the lightpipe PCB
50-pin connector.
11. Replace the disk canisters in the disk chassis.
12. Turn the PDA circuit breaker ON.
13. Close the PDA front and rear doors.
5–18 Removal and Replacement Procedures
