IBM 2104 Model DU3 - Manual (Page 49)

Switching On and Testing the 2104
1. If the power to the using system is switched off, switch it on.
2. Refer to Figure 26.
The 2104 has two lights. The green Power light 1 comes on and stays on.
The amber Check light 2 comes on for approximately two seconds and goes
off.
Each disk drive module has two lights. The green Activity light 3 comes on for
approximately two seconds when power is first supplied to the disk drive; it then
goes off. The amber Check light
4 then comes on for approximately two
seconds and then goes off.
Note: Dummy disk drive modules have no lights.
Configuration is complete when the lights on the 2104, and its installed disk
drive modules, are as described here (refer to Figure 26):
2104 Power light 1 : On
2104 Check light 2 : Off
Activity light 3 on each installed disk drive module: Off
Check light 4 on each installed disk drive module: Off
If the lights are correct:
a. Refer to the Web site described at “Web Support Pages” on page 59 for the
latest microcode and system software levels. Ensure that the using-system
software is at the correct level for the 2104, and that the correct level of
microcode for the disk drive modules has been loaded.
b. Go to Appendix A, “Operating with RISC Systems”, on page 35, which gives
information about how to configure your 2104 to the using system, what
service aids are available, and how to collect statistics during the operation
of your 2104.
Figure 26. Checking the Lights
Installing a 2104 Model DU3 33