I/O Rack Becomes Powered On, But A Rack-Mounted Unit Does Not Become
Powered On
If you have a problem powering on a drawer in an I/O rack, examine all the I/O drawer
Indicator Panels to attempt to isolate the problem I/O drawer. See “I/O Drawer Indicator
Panel” on page 30 for more information.
1. Are all circuit breakers reset at the I/O rack PDB?
No Reset the tripped circuit breaker.
This ends the procedure. Go to ″Map 0410: Repair Checkout″ in the
Diagnostic Information for Multiple Bus Systems.
Yes Go to step 2 of this procedure.
2. Are all the ac power cables seated firmly and connected from the I/O rack
PDB to the I/O drawer (one end to a PDB outlet, the other two ends of the
cable(s) to the two separate dc power supplies of the same I/O drawer)?
No Fix the connection.
This ends the procedure. Go to ″Map 0410: Repair Checkout″ in the
Diagnostic Information for Multiple Bus Systems.
Yes Go to step 3 of this procedure.
3. Perform the following:
Note: Read the Danger and Caution notices under “Safety Notices” on page xiii
before continuing with this procedure.
a. Disconnect the ac power cable from each power supply on each I/O drawer
that fails to power on.
b. Use a multimeter to measure the ac voltage at the I/O drawer end of the ac
power cables.
Is the ac voltage from 200 V ac to 240 V ac?
No Exchange the ac power cable(s)
This ends the procedure. Go to ″Map 0410: Repair Checkout″ in the
Diagnostic Information for Multiple Bus Systems.
Yes Go to step 4 of this procedure.
4. Is a primary I/O drawer in the I/O rack not powering on?
Note: The primary I/O drawer is the only I/O drawer with a Service processor card
in Slot 8.
No Go to step 8 on page 98.
Yes Go to step 5 on page 98.
Chapter 3. Maintenance Analysis Procedures 97
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