Product data

MAP 2020: 2104 – Power
This MAP helps you to isolate FRUs that are causing a power problem on a 2104.
Attention: Unless the using system needs to be switched off for some other reason, do
not switch off the using system when servicing the 2104 or any of its SCSI devices.
Power cables and external SCSI cables that connect the 2104 to the using system can
be disconnected while that system is running.
Step 1. (from step 12 in MAP 2010: 2104 – START)
You are here because the Subsystem Power light is off.
Are any lights on at the front of the 2104?
NO Go to step 2.
YES The Subsystem Power light has failed. In the sequence shown,
exchange the following FRUs for new FRUs. Ensure that for each
FRU exchange, you go to “MAP 2410: 2104 – Repair Verification” on
page 65 to verify the repair.
a. SCSI interface card (see “SCSI Interface Card Assembly” on
page 97)
b. Frame assembly (see “Frame Assembly” on page 106)
Step 2. (from step 1)
Observe the fan-and-power-supply assembly (or assemblies, if two are
present).
Does at least one fan-and-power-supply assembly have its AC PWR light
on?
NO Check the mainline power source and the power cable.
YES Go to step 3.
Step 3. (from step 2)
Observe the fan-and-power-supply assembly whose AC PWR light is on.
Is this fan-and-power-supply assembly switched on?
NO
a. Set the DC On/Standby switch to On.
b. If the problem is still not solved, go to “MAP 2010: 2104 – START”
on page 44.
YES Go to step 4 on page 50.
Chapter 2. Problem Determination Procedures 49