Product data

MAP 2030: 2104 – Power Control
This MAP helps you to isolate FRUs that are causing a power problem when power
control is active.
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 2 in MAP 2010: 2104 – START, and from step 5 in MAP 2020: 2104
– Power)
You are here because power is still present at the 2104 although the using
system is switched off.
Observe the switch card assembly (see “Switch Card Assembly” on page 102).
Is the power control switch set to Off?
NO If you want the 2104 to switch to Standby when the using system is
switched off or to Standby, set the 2104 power control switch to Off.
Alternatively, you can manually set the DC On/Standby switch to
Standby on each fan-and-power-supply assembly in the 2104.
YES Go to step 2.
Step 2. (from step 1)
Observe a SCSI interface card.
Is the TERM POWER light on?
NO Go to step 4 on page 58.
YES
a. Disconnect the SCSI cable from the SCSI interface card.
b. Go to step 3.
Step 3. (from step 2)
Does the TERM POWER light remain on?
NO The using system to which the SCSI cable is attached is supplying
terminator voltage. Check the using system to isolate the problem.
YES
a. Exchange the SCSI interface card assembly for a new one (see
“SCSI Interface Card Assembly” on page 97).
b. Go to “MAP 2410: 2104 – Repair Verification” on page 65 to verify
the repair.
Chapter 2. Problem Determination Procedures 57